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23c364f842
fpc/rtl/inc/graph/graph.pp
carl 23c364f842 + Fully implemented clipping 
* PatternnLine now calls HLine if the lines to draw are
      non-patterned (10-15% speedv improvement)
1999-04-25 02:28:54 +00:00

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{
This file is part of the Free Pascal run time library.
Copyright (c) 1993,99 by the Free Pascal development team
See the file COPYING.FPC, included in this distribution,
for details about the copyright.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
**********************************************************************}
Unit Graph2;
{-------------------------------------------------------}
{ Differences with TP Graph unit: }
{ - default putimage and getimage only support a max. }
{ of 64K colors on screen, because all pixels are }
{ saved as words. }
{ - Set RGB Palette is not used, SetPalette must be }
{ used instead. }
{ - In the TP graph unit, Clipping is always performed }
{ on strings written with OutText, and this clipping }
{ is done on a character per character basis (for }
{ example, if ONE part of a character is outside the }
{ viewport , then that character is not written at }
{ all to the screen. In FPC Pascal, clipping is done }
{ on a PIXEL basis, not a character basis, so part of }
{ characters which are not entirely in the viewport }
{ may appear on the screen. }
{ - SetTextStyle only conforms to the TP version when }
{ the correct (and expected) values are used for }
{ CharSize for stroked fonts (4 = stroked fonts) }
{ - InstallUserDriver is not supported, so always }
{ returns an error. }
{ - RegisterBGIDriver is not supported, so always }
{ returns an error. }
{ - DrawPoly XORPut mode is not exactly the same as in }
{ the TP graph unit. }
{ - FillEllipse does not support XORPut mode with a }
{ bounded FloodFill. Mode is always CopyPut mode. }
{ - Imagesize returns a longint instead of a word }
{ - ImageSize cannot return an error value }
{-------------------------------------------------------}
{ AUTHORS: }
{ Gernot Tenchio - original version }
{ Florian Klaempfl - major updates }
{ Pierre Mueller - major bugfixes }
{ Carl Eric Codere - complete rewrite }
{ Thomas Schatzl - optimizations,routines and }
{ Credits (external): suggestions. }
{ - Original FloodFill code by }
{ Menno Victor van der star }
{ (the code has been heavily modified) }
{-------------------------------------------------------}
{-------------------------------------------------------}
{ For significant speed improvements , is is recommended }
{ that these routines be hooked (otherwise the default, }
{ slower routines will be used) : }
{ HLine() }
{ VLine() }
{ PatternLine() }
{ ClearViewPort() }
{ PutImage() }
{ GetImage() - ImageSize() should also be changed }
{ InternalEllipse() }
{ Line() }
{ GetScanLine() }
{--------------------------------------------------------}
{ FPC unit requirements: }
{ All modes should at least have 1 graphics page to }
{ make it possible to create animation on all supported }
{ systems , this can be done either by double-buffering }
{ yourself in the heap if no hardware is available to do}
{ it. }
{--------------------------------------------------------}
{ COMPATIBILITY WARNING: Some of the compatibility tests }
{ were done using the CGA and other the VGA drivers. }
{ Within the BGI drivers themselves the BEHAVIOUR is not }
{ the same, so be warned!!! }
{--------------------------------------------------------}
{ History log: }
{ 15th February 1999: }
{ + Added support for system font in vertical mode }
{ + system font is now available for all platforms }
{ * font support routines now compile }
{ * textHeight would not return correct size for system }
{ font }
{ * Alignment of fonts partly fixed }
{ 17th Feb. 1999: }
{ + First support for stroked fonts }
{ 18th Feb. 1999: }
{ * bugfix of line drawing which fixes stroked font }
{ displays. }
{ 23rd Feb. 1999: }
{ + Applied Pierre's patches to font }
{ + Added scaling of bitmapped fonts }
{ + Vertical stroked fonts }
{ 24th Feb. 1999: }
{ * Scaling of stroked fonts must be done using FPs }
{ to be 100% compatible with turbo pascal }
{ + Sped up by 40% stroked font scaling calculations }
{ + RegisterBGIFont }
{ 9th march 1999: }
{ + Starting implementing Fillpoly() }
{ 15th march 1999: }
{ + SetFillStyle() }
{ + patternLine() }
{ + Bar() }
{ * GraphDefaults would not make the Default color }
{ of the fill pattern to the Max. Palette entry. }
{ + SetFillPattern() }
{ 20th march 1999: }
{ * GraphDefaults would not reset to the text system }
{ * DefaultFont would write one character too much to }
{ the screen }
{ + Sloped thick lines in Line() }
{ + Sloped patterned lines in Line() }
{ * GraphDefaults would not reset the User Fill pattern}
{ to $ff }
{ + DirectPutPixel takes care of XOR mode writes }
{ improves speed by about 30% over old method of }
{ GetPixel XOR CurrentColor }
{ * Dashed LineStyle exactly like BP version now }
{ + Center LineStyle (checked against CGA driver) }
{ * GraphDefaults() now resets linepattern array }
{ 1st april 1999: }
{ + First implementation of FillPoly (incomplete) }
{ 2nd april 1999: }
{ * FillPoly did not Reset PatternLine index }
{ * FillPoly did not use correct color }
{ * PatternLine was writing modes in reverse direction }
{ * PatternLine would not work with non-rectangular }
{ shapes. }
{ * PatternLine must fill up the ENTIRE pattern, }
{ with either the foreground or background color. }
{ * GraphDefaults() would not call SetBkColor() }
{ * Fixed some memory leaks in FillPoly() }
{ 11th April 1999: }
{ * PatternLine() was drawing one pixel less then }
{ requested }
{ 12th April 1999: }
{ + FloodFill - first working implementation }
{ Horrbly slow even on very fast cpu's }
{ + Some suggestions of Thomas implemented }
{ 13th April 1999: }
{ * FloodFill() vertical index was off by one pixel }
{ * FloodFill() would never draw the last line in the }
{ list }
{ - Removed ClearViewPort320 which was wrong anyways, }
{ will need to be implemented later. }
{ * PatternLine() would not always restore write mode }
{ + Circle() uses NormalPut always with NormWidth lines}
{ + FillEllipse() initial version }
{ * InternalEllipse() - 0 to 360 now supported as }
{ angles. }
{ 14th April 1999: }
{ * mod x = and (x-1)(from Thomas Schatzl) gives a }
{ significant speed improvement. }
{ 15th april 1999: }
{ + Arc() ok except for Aspect Ratio, which does not }
{ give us the correct ratio on a 320x200 screen. }
{ + Added FillPoly() from Thomas Schatzl }
{ + More hookable routines }
{ 16th april 1999: }
{ + Line() checked ok. }
{ 17th april 1999: }
{ * GraphDefaults() would not reset CP }
{ + GetX(), GetY(), MoveTo() checked for viewports }
{ * OutTextXY() should not update the CP }
{ * ClearViewPort() would not update the CP }
{ * ClearDevice() would not update the CP }
{ * Sector() would update the CP by calling LineTo }
{ * Bar3D() would update the CP }
{ * PieSlice() would update the CP }
{ 18th april 1999: }
{ + Clipping algorithm }
{ 19th april 1999: }
{ + Adapterinfo structure }
{ 20th april 1999: }
{ + GetModeName }
{ + GetGraphMode }
{ + GetModeRange }
{--------------------------------------------------------}
{ LEFT TO DO: }
{ - optimize scaling of stroked fonts }
{ - optimize InternalEllipse() }
{ using linear appx. of sine/cosine tables }
{ - justification for stroked fonts does not work }
{ - On Closegraph deallocate all font pointers }
{--------------------------------------------------------}
{ text.inc will crash on aligned requirement machines. }
{ (packed record for fontrec) }
{$G+}
Interface
const
{ error codes }
grOk = 0;
grNoInitGraph = -1;
grNotDetected = -2;
grFileNotFound = -3;
grInvalidDriver = -4;
grNoLoadMem = -5;
grNoScanMem = -6;
grNoFloodMem = -7;
grFontNotFound = -8;
grNoFontMem = -9;
grInvalidMode = -10;
grError = -11;
grIOerror = -12;
grInvalidFont = -13;
grInvalidFontNum = -14;
grInvalidVersion = -18;
black = 0;
blue = 1;
green = 2;
cyan = 3;
red = 4;
magenta = 5;
brown = 6;
lightgray = 7;
darkgray = 8;
lightblue = 9;
lightgreen = 10;
lightcyan = 11;
lightred = 12;
lightmagenta = 13;
yellow = 14;
white = 15;
{ Line styles for GetLineStyle/SetLineStyle }
SolidLn = 0;
DottedLn = 1;
CenterLn = 2;
DashedLn = 3;
UserBitLn = 4;
NormWidth = 1;
ThickWidth = 3;
{ Set/GetTextStyle Konstanten: }
DefaultFont = 0;
TriplexFont = 1;
SmallFont = 2;
SansSerifFont = 3;
GothicFont = 4;
ScriptFont = 5;
SimpleFont = 6;
TSCRFont = 7;
LCOMFont = 8;
EuroFont = 9;
BoldFont = 10;
HorizDir = 0;
VertDir = 1;
UserCharSize = 0;
ClipOn = true;
ClipOff = false;
{ Bar3D constants }
TopOn = true;
TopOff = false;
{ fill pattern for Get/SetFillStyle: }
EmptyFill = 0;
SolidFill = 1;
LineFill = 2;
LtSlashFill = 3;
SlashFill = 4;
BkSlashFill = 5;
LtBkSlashFill = 6;
HatchFill = 7;
XHatchFill = 8;
InterleaveFill = 9;
WideDotFill = 10;
CloseDotFill = 11;
UserFill = 12;
{ bitblt operators }
NormalPut = 0;
CopyPut = 0;
XORPut = 1;
OrPut = 2;
AndPut = 3;
NotPut = 4;
{ SetTextJustify constants }
LeftText = 0;
CenterText = 1;
RightText = 2;
BottomText = 0;
TopText = 2;
{ graphic drivers }
CurrentDriver = -128;
Detect = 0;
LowRes = 1;
HercMono = 7;
VGA = 9;
{ graph modes }
Default = 0;
{ VGA Driver modes }
VGALo = 0;
VGAMed = 1;
VGAHi = 2;
{ Hercules mono card }
HercMonoHi = 0;
type
RGBColor = record
r,g,b,i : byte;
end;
PaletteType = record
Size : integer;
Colors : array[0..767]of Byte;
end;
LineSettingsType = record
linestyle : word;
pattern : word;
thickness : word;
end;
TextSettingsType = record
font : word;
direction : word;
charsize : word;
horiz : word;
vert : word;
end;
FillSettingsType = record
pattern : word;
color : word;
end;
FillPatternType = array[1..8] of byte;
PointType = record
x,y : integer;
end;
ViewPortType = record
x1,y1,x2,y2 : integer;
Clip : boolean;
end;
ArcCoordsType = record
x,y : integer;
xstart,ystart : integer;
xend,yend : integer;
end;
const
fillpatternTable : array[0..12] of FillPatternType = (
($00,$00,$00,$00,$00,$00,$00,$00), { background color }
($ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff), { foreground color }
($ff,$ff,$00,$00,$ff,$ff,$00,$00), { horizontal lines }
($01,$02,$04,$08,$10,$20,$40,$80), { slashes }
($07,$0e,$1c,$38,$70,$e0,$c1,$83), { thick slashes }
($07,$83,$c1,$e0,$70,$38,$1c,$0e), { thick backslashes }
($5a,$2d,$96,$4b,$a5,$d2,$69,$b4), { backslashes }
($ff,$88,$88,$88,$ff,$88,$88,$88), { small boxes }
($18,$24,$42,$81,$81,$42,$24,$18), { rhombus }
($cc,$33,$cc,$33,$cc,$33,$cc,$33), { wall pattern }
($80,$00,$08,$00,$80,$00,$08,$00), { wide points }
($88,$00,$22,$00,$88,$00,$22,$00), { dense points }
(0,0,0,0,0,0,0,0) { user defined line style }
);
{ ******************** PROCEDURAL VARIABLES ********************* }
{ * These are hooks which have device specific stuff in them, * }
{ * therefore to add new modes or to redirect these routines * }
{ * then declare variables of these types as shown below. * }
{-----------------------------------------------------------------}
TYPE
{ This is the standard putpixel routine used by all function }
{ drawing routines, it will use the viewport settings, as }
{ well as clip, and use the current foreground color to plot }
{ the desired pixel. }
defpixelproc = procedure(X,Y: Integer);
{ standard plot and get pixel }
getpixelproc = function(X,Y: Integer): word;
putpixelproc = procedure(X,Y: Integer; Color: Word);
{ clears the viewport, also used to clear the device }
clrviewproc = procedure;
{ putimage procedure, can be hooked to accomplish transparency }
putimageproc = procedure (X,Y: Integer; var Bitmap; BitBlt: Word);
getimageproc = procedure(X1,Y1,X2,Y2: Integer; Var Bitmap);
imagesizeproc= function (X1,Y1,X2,Y2: Integer): longint;
graphfreememprc = procedure (var P: Pointer; size: word);
graphgetmemprc = procedure (var P: pointer; size: word);
{ internal routines -- can be hooked for much faster drawing }
{ draw filled horizontal lines using current color }
{ on entry coordinates are already clipped. }
hlineproc = procedure (x, x2,y : integer);
{ on entry coordinates are already clipped. }
{ draw filled vertical line using current color }
vlineproc = procedure (x,y,y2: integer);
{ this routine is used to draw filled patterns for all routines }
{ that require it. (FillPoly, FloodFill, Sector, etc... }
{ clipping is verified, uses current Fill settings for drawing }
patternlineproc = procedure (x1,x2,y: integer);
{ this routine is used to draw all circles/ellipses/sectors }
{ more info... on this later... }
ellipseproc = procedure (X,Y: Integer;XRadius: word;
YRadius:word; stAngle,EndAngle: word);
{ Line routine - draws lines thick/norm widths with current }
{ color and line style - LINE must be clipped here. }
lineproc = procedure (X1, Y1, X2, Y2 : Integer);
{ this routine is used for FloodFill - it returns an entire }
{ screen scan line with a word for each pixel in the scanline }
getscanlineproc = procedure (Y : integer; var data);
{ this routine actually switches to the desired video mode. }
initmodeproc = procedure;
{ this routine is called to save the sate just before a mode set }
savestateproc = procedure;
{ this routine is called in closegraph to cleanup... }
restorestateproc = procedure;
TYPE
{-----------------------------------}
{ Linked list for mode information }
{ This list is set up by one of the }
{ following routines: }
{ It lists all available resolutions}
{ on this display adapter. }
{-----------------------------------}
{ QueryAdapter() }
{ DetectGraph() }
{ InitGraph() }
{-----------------------------------}
PModeInfo = ^TModeInfo;
TModeInfo = record
DriverNumber: Integer;
ModeNumber: Integer;
MaxColor: Longint;
XAspect : Integer;
YAspect : Integer;
MaxX: Integer;
MaxY: Integer;
ModeName: String[18];
{ necessary hooks ... }
DirectPutPixel : DefPixelProc;
GetPixel : GetPixelProc;
PutPixel : PutPixelProc;
{ defaults possible ... }
ClearViewPort : ClrViewProc;
PutImage : PutImageProc;
GetImage : GetImageProc;
ImageSize : ImageSizeProc;
GetScanLine : GetScanLineProc;
Line : LineProc;
InternalEllipse: EllipseProc;
PatternLine : PatternLineProc;
HLine : HLineProc;
VLine : VLineProc;
InitMode : InitModeProc;
next: PModeInfo;
end;
VAR
DirectPutPixel : DefPixelProc;
ClearViewPort : ClrViewProc;
PutPixel : PutPixelProc;
PutImage : PutImageProc;
GetImage : GetImageProc;
ImageSize : ImageSizeProc;
GetPixel : GetPixelProc;
GraphFreeMemPtr: graphfreememprc;
GraphGetMemPtr : graphgetmemprc;
GetScanLine : GetScanLineProc;
Line : LineProc;
InternalEllipse: EllipseProc;
PatternLine : PatternLineProc;
HLine : HLineProc;
VLine : VLineProc;
SaveVideoState : SaveStateProc;
RestoreVideoState: RestoreStateProc;
Procedure Closegraph;
procedure SetLineStyle(LineStyle: word; Pattern: word; Thickness: word);
procedure SetVisualPage(page : word);
procedure SetActivePage(page : word);
function GraphErrorMsg(ErrorCode: Integer): string;
Function GetMaxX: Integer;
Function GetMaxY: Integer;
Procedure SetViewPort(X1, Y1, X2, Y2: Integer; Clip: Boolean);
Function GraphResult: Integer;
function GetModeName(ModeNumber: integer): string;
procedure SetGraphMode(Mode: Integer);
function GetGraphMode: Integer;
function GetMaxMode: word;
procedure RestoreCrtMode;
procedure GetModeRange(GraphDriver: Integer; var LoMode, HiMode: Integer);
Function GetX: Integer;
Function GetY: Integer;
procedure GraphDefaults;
procedure ClearDevice;
procedure GetViewSettings(var viewport : ViewPortType);
procedure SetWriteMode(WriteMode : integer);
procedure GetFillSettings(var Fillinfo:Fillsettingstype);
procedure GetFillPattern(var FillPattern:FillPatternType);
procedure GetLineSettings(var ActiveLineInfo : LineSettingsType);
procedure InitGraph(var GraphDriver:Integer;var GraphMode:Integer;const PathToDriver:String);
function InstallUserDriver(Name: string; AutoDetectPtr: Pointer): integer;
function RegisterBGIDriver(driver: pointer): integer;
procedure SetFillStyle(Pattern : word; Color: word);
procedure SetFillPattern(Pattern: FillPatternType; Color: word);
procedure MoveRel(Dx, Dy: Integer);
procedure MoveTo(X,Y: Integer);
{ -------------------- Color/Palette ------------------------------- }
procedure SetBkColor(ColorNum: Word);
function GetColor: Word;
function GetBkColor: Word;
procedure SetColor(Color: Word);
function GetMaxColor: word;
{ -------------------- Shapes/Lines -------------------------------- }
procedure Rectangle(x1,y1,x2,y2:integer);
procedure Bar(x1,y1,x2,y2:integer);
procedure Bar3D(x1, y1, x2, y2 : integer;depth : word;top : boolean);
procedure FillPoly(NumPoints: word; Var PolyPoints);
procedure DrawPoly(NumPoints : word;var polypoints);
procedure LineRel(Dx, Dy: Integer);
procedure LineTo(X,Y : Integer);
procedure FloodFill(x : integer; y : integer; Border: word);
{ -------------------- Circle related routines --------------------- }
procedure GetAspectRatio(var Xasp,Yasp : word);
procedure SetAspectRatio(Xasp, Yasp : word);
procedure Arc(X,Y : Integer; StAngle,EndAngle,Radius: word);
procedure PieSlice(X,Y,stangle,endAngle:integer;Radius: Word);
procedure FillEllipse(X, Y: Integer; XRadius, YRadius: Word);
procedure Circle(X, Y: Integer; Radius:Word);
procedure Sector(x, y: Integer; StAngle,EndAngle, XRadius, YRadius: Word);
procedure Ellipse(X,Y : Integer; stAngle, EndAngle: word; XRadius,
YRadius: word);
{ --------------------- Text related routines --------------------- }
function InstallUserFont(const FontFileName : string) : integer;
function RegisterBGIfont(font : pointer) : integer;
procedure GetTextSettings(var TextInfo : TextSettingsType);
function TextHeight(const TextString : string) : word;
function TextWidth(const TextString : string) : word;
procedure SetTextJustify(horiz,vert : word);
procedure SetTextStyle(font,direction : word;charsize : word);
procedure SetUserCharSize(Multx,Divx,Multy,Divy : word);
procedure OutTextXY(x,y : integer;const TextString : string);
procedure OutText(const TextString : string);
Implementation
const
StdBufferSize = 4096; { Buffer size for FloodFill }
type
tinttable = array[0..8192] of integer;
pinttable = ^tinttable;
WordArray = Array [0..StdbufferSize] Of word;
PWordArray = ^WordArray;
const
{ Mask for each bit in byte used to determine pattern }
BitArray: Array[0..7] of byte =
($01,$02,$04,$08,$10,$20,$40,$80);
RevbitArray: Array[0..7] of byte =
($80,$40,$20,$10,$08,$04,$02,$01);
{ pre expanded line patterns }
{ 0 = LSB of byte pattern }
{ 15 = MSB of byte pattern }
LinePatterns: Array[0..15] of BOOLEAN =
(TRUE,TRUE,TRUE,TRUE,TRUE,TRUE,TRUE,TRUE,
TRUE,TRUE,TRUE,TRUE,TRUE,TRUE,TRUE,TRUE);
const
BGIPath : string = '.';
{ Default font 8x8 system from IBM PC }
{$i fontdata.inc}
var
CurrentColor: Word;
CurrentBkColor: Word;
CurrentX : Integer; { viewport relative }
CurrentY : Integer; { viewport relative }
ClipPixels: Boolean; { Should cliiping be enabled }
CurrentWriteMode: Integer;
_GraphResult : Integer;
LineInfo : LineSettingsType;
FillSettings: FillSettingsType;
{ information for Text Output routines }
CurrentTextInfo : TextSettingsType;
CurrentXRatio: Real;
CurrentYRatio: Real;
installedfonts: longint; { Number of installed fonts }
StartXViewPort: Integer; { absolute }
StartYViewPort: Integer; { absolute }
ViewWidth : Integer;
ViewHeight: Integer;
VideoStart: Pointer; { ADDRESS OF CURRENT ACTIVE PAGE }
IsGraphMode : Boolean; { Indicates if we are in graph mode or not }
ArcCall: ArcCoordsType; { Information on the last call to Arc or Ellipse }
var
{ ******************** HARDWARE INFORMATION ********************* }
{ Should be set in InitGraph once only. }
IntCurrentMode : Integer;
IntCurrentDriver : Integer; { Currently loaded driver }
XAspect : Integer;
YAspect : Integer;
MaxX : Integer; { Maximum resolution - ABSOLUTE }
MaxY : Integer; { Maximum resolution - ABSOLUTE }
MaxColor : Longint;
DriverName: String;
ModeList : PModeInfo;
{--------------------------------------------------------------------------}
{ }
{ LINE AND LINE RELATED ROUTINES }
{ }
{--------------------------------------------------------------------------}
{$i clip.inc}
procedure HLineDefault(x,x2,y: integer);
var
Col: word;
xtmp: integer;
Begin
{ must we swap the values? }
if x >= x2 then
Begin
xtmp := x2;
x2 := x;
x:= xtmp;
end;
{ First convert to global coordinates }
X := X + StartXViewPort;
X2 := X2 + StartXViewPort;
Y := Y + StartYViewPort;
if ClipPixels then
Begin
if LineClipped(x,y,x2,y,StartXViewPort,StartYViewPort,
StartXViewPort+ViewWidth, StartYViewPort+ViewHeight) then
exit;
end;
for x:= x to x2 do
DirectPutPixel(X,Y);
end;
procedure VLineDefault(x,y,y2: integer);
var
Col: word;
ytmp: integer;
Begin
{ must we swap the values? }
if y >= y2 then
Begin
ytmp := y2;
y2 := y;
y:= ytmp;
end;
{ First convert to global coordinates }
X := X + StartXViewPort;
Y2 := Y2 + StartYViewPort;
Y := Y + StartYViewPort;
if ClipPixels then
Begin
if LineClipped(x,y,x,y2,StartXViewPort,StartYViewPort,
StartXViewPort+ViewWidth, StartYViewPort+ViewHeight) then
exit;
end;
for y := y to y2 do Directputpixel(x,y)
End;
procedure LineDefault(X1, Y1, X2, Y2: Integer);
var X, Y : Integer;
deltax, deltay : Integer;
d, dinc1, dinc2: Integer;
xinc1 : Integer;
xinc2 : Integer;
yinc1 : Integer;
yinc2 : Integer;
i, j : Integer;
Flag : Boolean; { determines pixel direction in thick lines }
NumPixels : Integer;
PixelCount : Integer;
OldCurrentColor: Word;
swtmp : integer;
TmpNumPixels : integer;
begin
{******************************************}
{ SOLID LINES }
{******************************************}
if lineinfo.LineStyle = SolidLn then
Begin
{ we separate normal and thick width for speed }
{ and because it would not be 100% compatible }
{ with the TP graph unit otherwise }
if y1 = y2 then
Begin
{******************************************}
{ SOLID LINES HORIZONTAL }
{******************************************}
if lineinfo.Thickness=NormWidth then
hline(x1,x2,y2)
else
begin
{ thick width }
hline(x1,x2,y2-1);
hline(x1,x2,y2);
hline(x2,x2,y2+1);
end;
end
else
if x1 = x2 then
Begin
{******************************************}
{ SOLID LINES VERTICAL }
{******************************************}
if lineinfo.Thickness=NormWidth then
vline(x1,y1,y2)
else
begin
{ thick width }
vline(x1-1,y1,y2);
vline(x1,y1,y2);
vline(x1+1,y1,y2);
end;
end
else
begin
{ Convert to global coordinates. }
x1 := x1 + StartXViewPort;
x2 := x2 + StartXViewPort;
y1 := y1 + StartYViewPort;
y2 := y2 + StartYViewPort;
{ if fully clipped then exit... }
if ClipPixels then
begin
if LineClipped(x1,y1,x2,y2,StartXViewPort, StartYViewPort,
StartXViewPort+ViewWidth, StartYViewPort+ViewHeight) then
exit;
end;
{******************************************}
{ SLOPED SOLID LINES }
{******************************************}
oldCurrentColor := CurrentColor;
{ Calculate deltax and deltay for initialisation }
deltax := abs(x2 - x1);
deltay := abs(y2 - y1);
{ Initialize all vars based on which is the independent variable }
if deltax >= deltay then
begin
Flag := FALSE;
{ x is independent variable }
numpixels := deltax + 1;
d := (2 * deltay) - deltax;
dinc1 := deltay Shl 1;
dinc2 := (deltay - deltax) shl 1;
xinc1 := 1;
xinc2 := 1;
yinc1 := 0;
yinc2 := 1;
end
else
begin
Flag := TRUE;
{ y is independent variable }
numpixels := deltay + 1;
d := (2 * deltax) - deltay;
dinc1 := deltax Shl 1;
dinc2 := (deltax - deltay) shl 1;
xinc1 := 0;
xinc2 := 1;
yinc1 := 1;
yinc2 := 1;
end;
{ Make sure x and y move in the right directions }
if x1 > x2 then
begin
xinc1 := - xinc1;
xinc2 := - xinc2;
end;
if y1 > y2 then
begin
yinc1 := - yinc1;
yinc2 := - yinc2;
end;
{ Start drawing at <x1, y1> }
x := x1;
y := y1;
If LineInfo.Thickness=NormWidth then
Begin
{ Draw the pixels }
for i := 1 to numpixels do
begin
DirectPutPixel(x, y);
if d < 0 then
begin
d := d + dinc1;
x := x + xinc1;
y := y + yinc1;
end
else
begin
d := d + dinc2;
x := x + xinc2;
y := y + yinc2;
end;
CurrentColor := OldCurrentColor;
end;
end
else
{ Thick width lines }
begin
{ Draw the pixels }
for i := 1 to numpixels do
begin
{ all depending on the slope, we can determine }
{ in what direction the extra width pixels will be put }
If Flag then
Begin
DirectPutPixel(x-1,y);
DirectPutPixel(x,y);
DirectPutPixel(x+1,y);
end
else
Begin
DirectPutPixel(x, y-1);
DirectPutPixel(x, y);
DirectPutPixel(x, y+1);
end;
if d < 0 then
begin
d := d + dinc1;
x := x + xinc1;
y := y + yinc1;
end
else
begin
d := d + dinc2;
x := x + xinc2;
y := y + yinc2;
end;
CurrentColor := OldCurrentColor;
end;
end;
end;
end
else
{******************************************}
{ begin patterned lines }
{******************************************}
Begin
{ Convert to global coordinates. }
x1 := x1 + StartXViewPort;
x2 := x2 + StartXViewPort;
y1 := y1 + StartYViewPort;
y2 := y2 + StartYViewPort;
{ if fully clipped then exit... }
if ClipPixels then
begin
if LineClipped(x1,y1,x2,y2,StartXViewPort, StartYViewPort,
StartXViewPort+ViewWidth, StartYViewPort+ViewHeight) then
exit;
end;
OldCurrentColor := CurrentColor;
PixelCount:=0;
if y1 = y2 then
Begin
{ Check if we must swap }
if x1 >= x2 then
Begin
swtmp := x1;
x1 := x2;
x2 := swtmp;
end;
if LineInfo.Thickness = NormWidth then
Begin
for PixelCount:=x1 to x2 do
{ optimization: PixelCount mod 16 }
if LinePatterns[PixelCount and 15] = TRUE then
begin
DirectPutPixel(PixelCount,y2);
end;
end
else
Begin
for i:=-1 to 1 do
Begin
for PixelCount:=x1 to x2 do
{ Optimization from Thomas - mod 16 = and 15 }
if LinePatterns[PixelCount and 15] = TRUE then
begin
DirectPutPixel(PixelCount,y2+i);
end;
end;
end;
end
else
if x1 = x2 then
Begin
{ Check if we must swap }
if y1 >= y2 then
Begin
swtmp := y1;
y1 := y2;
y2 := swtmp;
end;
if LineInfo.Thickness = NormWidth then
Begin
for PixelCount:=y1 to y2 do
{ compare if we should plot a pixel here , compare }
{ with predefined line patterns... }
if LinePatterns[PixelCount and 15] = TRUE then
begin
DirectPutPixel(x1,PixelCount);
end;
end
else
Begin
for i:=-1 to 1 do
Begin
for PixelCount:=y1 to y2 do
{ compare if we should plot a pixel here , compare }
{ with predefined line patterns... }
if LinePatterns[PixelCount and 15] = TRUE then
begin
DirectPutPixel(x1+i,PixelCount);
end;
end;
end;
end
else
Begin
oldCurrentColor := CurrentColor;
{ Calculate deltax and deltay for initialisation }
deltax := abs(x2 - x1);
deltay := abs(y2 - y1);
{ Initialize all vars based on which is the independent variable }
if deltax >= deltay then
begin
Flag := FALSE;
{ x is independent variable }
numpixels := deltax + 1;
d := (2 * deltay) - deltax;
dinc1 := deltay Shl 1;
dinc2 := (deltay - deltax) shl 1;
xinc1 := 1;
xinc2 := 1;
yinc1 := 0;
yinc2 := 1;
end
else
begin
Flag := TRUE;
{ y is independent variable }
numpixels := deltay + 1;
d := (2 * deltax) - deltay;
dinc1 := deltax Shl 1;
dinc2 := (deltax - deltay) shl 1;
xinc1 := 0;
xinc2 := 1;
yinc1 := 1;
yinc2 := 1;
end;
{ Make sure x and y move in the right directions }
if x1 > x2 then
begin
xinc1 := - xinc1;
xinc2 := - xinc2;
end;
if y1 > y2 then
begin
yinc1 := - yinc1;
yinc2 := - yinc2;
end;
{ Start drawing at <x1, y1> }
x := x1;
y := y1;
If LineInfo.Thickness=ThickWidth then
Begin
TmpNumPixels := NumPixels-1;
{ Draw the pixels }
for i := 0 to TmpNumPixels do
begin
{ all depending on the slope, we can determine }
{ in what direction the extra width pixels will be put }
If Flag then
Begin
{ compare if we should plot a pixel here , compare }
{ with predefined line patterns... }
if LinePatterns[i and 15] = TRUE then
begin
DirectPutPixel(x-1,y);
DirectPutPixel(x,y);
DirectPutPixel(x+1,y);
end;
end
else
Begin
{ compare if we should plot a pixel here , compare }
{ with predefined line patterns... }
if LinePatterns[i and 15] = TRUE then
begin
DirectPutPixel(x,y-1);
DirectPutPixel(x,y);
DirectPutPixel(x,y+1);
end;
end;
if d < 0 then
begin
d := d + dinc1;
x := x + xinc1;
y := y + yinc1;
end
else
begin
d := d + dinc2;
x := x + xinc2;
y := y + yinc2;
end;
end;
end
else
Begin
{ instead of putting in loop , substract by one now }
TmpNumPixels := NumPixels-1;
{ NormWidth }
for i := 0 to TmpNumPixels do
begin
if LinePatterns[i and 15] = TRUE then
begin
DirectPutPixel(x,y);
end;
if d < 0 then
begin
d := d + dinc1;
x := x + xinc1;
y := y + yinc1;
end
else
begin
d := d + dinc2;
x := x + xinc2;
y := y + yinc2;
end;
end;
end
end;
{******************************************}
{ end patterned lines }
{******************************************}
{ restore color }
CurrentColor:=OldCurrentColor;
end;
end; { Line }
{********************************************************}
{ Procedure InternalEllipse() }
{--------------------------------------------------------}
{ This routine first calculates all points required to }
{ draw a circle to the screen, and stores the points }
{ to display in a buffer before plotting them. The }
{ aspect ratio of the screen is taken into account when }
{ calculating the values. }
{--------------------------------------------------------}
{ INPUTS: X,Y : Center coordinates of Ellipse. }
{ XRadius - X-Axis radius of ellipse. }
{ YRadius - Y-Axis radius of ellipse. }
{ stAngle, EndAngle: Start angle and end angles of the }
{ ellipse (used for partial ellipses and circles) }
{--------------------------------------------------------}
{ NOTE: - uses the current write mode. }
{ - Angles must both be between 0 and 360 }
{********************************************************}
Procedure InternalEllipseDefault(X,Y: Integer;XRadius: word;
YRadius:word; stAngle,EndAngle: word);
var
i:integer;
xpt: pinttable;
ypt: pinttable;
j,Delta:real;
NumOfPixels: longint;
NumOfPix: Array[0..2] of longint;
count: longint;
ConvFac,TempTerm: real;
aval,bval: integer;
OldcurrentColor: word;
TmpAngle: word;
DeltaAngle: word;
Begin
{ check if valid angles }
if (stAngle > 360) or (EndAngle > 360) then exit;
{ if impossible angles then swap them! }
if Endangle < StAngle then
Begin
TmpAngle:=EndAngle;
EndAngle:=StAngle;
Stangle:=TmpAngle;
end;
{ calculate difference of angle now so we don't always have to calculate it }
DeltaAngle:= EndAngle-StAngle;
i:=0;
if LineInfo.Thickness=NormWidth then
Begin
{ approximate the number of pixels required by using the circumference }
{ equation of an ellipse. }
NumOfPixels:=8*Round(2*sqrt((sqr(XRadius)+sqr(YRadius)) div 2));
GetMem(xpt,NumOfpixels*sizeof(word));
GetMem(ypt,NumOfPixels*sizeof(word));
{ Calculate the angle precision required }
Delta := DeltaAngle / (NumOfPixels);
{ Adjust for screen aspect ratio }
XRadius:=(longint(XRadius)*10000) div XAspect;
YRadius:=(longint(YRadius)*10000) div YAspect;
{ Initial counter value }
j:=Delta+StAngle;
{ removed from inner loop to make faster }
ConvFac:=Pi/180.0;
Repeat
{ this used by both sin and cos }
TempTerm := j*ConvFac;
{ Calculate points }
{$R-}
xpt^[i]:=round(XRadius*Cos(TempTerm));
{ calculate the value of y }
ypt^[i]:=round(YRadius*Sin(TempTerm+Pi));
{$R+}
j:=j+Delta;
inc(i);
Until j > DeltaAngle;
end
else
{******************************************}
{ CIRCLE OR ELLIPSE WITH THICKNESS=3 }
{******************************************}
Begin
NumOfPix[1]:=8*Round(2*sqrt((sqr(XRadius)+sqr(YRadius)) div 2));
NumOfPix[0]:=8*Round(2*sqrt((sqr(XRadius-1)+sqr(YRadius-1)) div 2));
NumOfPix[2]:=8*Round(2*sqrt((sqr(XRadius+1)+sqr(YRadius+1)) div 2));
GetMem(xpt,(NumOfPix[1]+NumOfPix[2]+NumOfPix[0])*sizeof(word));
GetMem(ypt,(NumOfPix[1]+NumOfPix[2]+NumOfPix[0])*sizeof(word));
{ removed from inner loop to make faster }
ConvFac:=Pi/180.0;
for Count:=0 to 2 do
Begin
aval:=XRadius+Count-1;
bval:=YRadius+Count-1;
Delta := DeltaAngle / (NumOfPix[Count]);
aval:= (longint(aval)*10000) div XAspect;
bval:= (longint(bval)*10000) div YAspect;
j:=Delta+Stangle;
Repeat
{ this used by both sin and cos }
TempTerm := j*ConvFac;
{$R-}
xpt^[i]:=round((aval)*Cos(TempTerm));
{ calculate the value of y }
ypt^[i]:=round(bval*Sin(TempTerm+Pi));
{$R+}
j:=j+Delta;
inc(i);
Until j > DeltaAngle;
end;
end;
{******************************************}
{ NOW ALL PIXEL POINTS ARE IN BUFFER }
{ plot them all to the screen }
{******************************************}
Count:=0;
OldcurrentColor:=currentColor;
Repeat
{$R-}
DirectPutPixel(xpt^[Count]+X,ypt^[Count]+Y);
{$R+}
inc(count);
until Count>=i;
{ Get End and Start points into the ArcCall information record }
ArcCall.X := X;
ArcCall.Y := Y;
ArcCall.XStart := xpt^[0] + X;
ArcCall.YStart := ypt^[0] + Y;
{$R-}
ArcCall.XEnd := xpt^[Count-1] + X;
ArcCall.YEnd := ypt^[Count-1] + Y;
{$R+}
CurrentColor:=OldCurrentColor;
if LineInfo.Thickness=NormWidth then
Begin
Freemem(xpt,NumOfPixels*sizeof(word));
Freemem(ypt,NumOfPixels*sizeof(word));
end
else
Begin
FreeMem(xpt,(NumOfPix[1]+NumOfPix[2]+NumOfPix[0])*sizeof(word));
FreeMem(ypt,(NumOfPix[1]+NumOfPix[2]+NumOfPix[0])*sizeof(word));
end;
end;
procedure PatternLineDefault(x1,x2,y: integer);
{********************************************************}
{ Draws a horizontal patterned line according to the }
{ current Fill Settings. }
{********************************************************}
{ Important notes: }
{ - CurrentColor must be set correctly before entering }
{ this routine. }
{********************************************************}
var
NrIterations: Integer;
i : Integer;
j : Integer;
TmpFillPattern : byte;
OldWriteMode : word;
OldCurrentColor : word;
begin
{ convert to global coordinates ... }
x1 := x1 + StartXViewPort;
x2 := x2 + StartXViewPort;
y := y + StartYViewPort;
{ if line was fully clipped then exit...}
if LineClipped(x1,y,x2,y,StartXViewPort,StartYViewPort,
StartXViewPort+ViewWidth, StartYViewPort+ViewHeight) then
exit;
OldWriteMode := CurrentWriteMode;
CurrentWriteMode := NormalPut;
{ number of times to go throuh the 8x8 pattern }
NrIterations := abs(x2 - x1) div 8;
Inc(NrIterations);
{ Get the current pattern }
TmpFillPattern := FillPatternTable
{ [FillSettings.Pattern][(((y+viewport.x1) and $7)+1];}
[FillSettings.Pattern][(y and $7)+1];
if FillSettings.Pattern = EmptyFill then
begin
OldCurrentColor := CurrentColor;
CurrentColor := CurrentBkColor;
HLine(x1,x2,y);
CurrentColor := OldCurrentColor;
end
else
if FillSettings.Pattern = SolidFill then
begin
HLine(x1,x2,y);
end
else
begin
For i:= 0 to NrIterations do
Begin
for j:=0 to 7 do
Begin
{ x1 mod 8 }
if RevBitArray[x1 and 7] and TmpFillPattern <> 0 then
DirectPutpixel(x1,y)
else
begin
{ According to the TP graph manual, we overwrite everything }
{ which is filled up - checked against VGA and CGA drivers }
{ of TP. }
OldCurrentColor := CurrentColor;
CurrentColor := CurrentBkColor;
DirectPutPixel(x1,y);
CurrentColor := OldCurrentColor;
end;
Inc(x1);
if x1 > x2 then
begin
CurrentWriteMode := OldWriteMode;
exit;
end;
end;
end;
end;
CurrentWriteMode := OldWriteMode;
end;
procedure LineRel(Dx, Dy: Integer);
Begin
Line(CurrentX, CurrentY, CurrentX + Dx, CurrentY + Dy);
CurrentX := CurrentX + Dx;
CurrentY := CurrentY + Dy;
end;
procedure LineTo(x,y : Integer);
Begin
Line(CurrentX, CurrentY, X, Y);
CurrentX := X;
CurrentY := Y;
end;
procedure Rectangle(x1,y1,x2,y2:integer);
begin
{ Do not draw the end points }
Line(x1,y1,x2-1,y1);
Line(x1,y1+1,x1,y2);
Line(x2,y1,x2,y2-1);
Line(x1+1,y2,x2,y2);
end;
procedure GetLineSettings(var ActiveLineInfo : LineSettingsType);
begin
Activelineinfo:=Lineinfo;
end;
procedure SetLineStyle(LineStyle: word; Pattern: word; Thickness: word);
var
i: byte;
j: byte;
Begin
if (LineStyle > UserBitLn) or ((Thickness <> Normwidth) and (Thickness <> ThickWidth)) then
_GraphResult := grError
else
begin
LineInfo.Thickness := Thickness;
LineInfo.LineStyle := LineStyle;
case LineStyle of
UserBitLn: Lineinfo.Pattern := pattern;
SolidLn: Lineinfo.Pattern := $ffff; { ------- }
DashedLn : Lineinfo.Pattern := $F8F8; { -- -- --}
DottedLn: LineInfo.Pattern := $CCCC; { - - - - }
CenterLn: LineInfo.Pattern := $FC78; { -- - -- }
end; { end case }
{ setup pattern styles }
j:=15;
for i:=0 to 15 do
Begin
{ bitwise mask for each bit in the word }
if (word($01 shl i) AND LineInfo.Pattern) <> 0 then
LinePatterns[j]:=TRUE
else
LinePatterns[j]:=FALSE;
Dec(j);
end;
end;
end;
{--------------------------------------------------------------------------}
{ }
{ VIEWPORT RELATED ROUTINES }
{ }
{--------------------------------------------------------------------------}
Procedure ClearViewPortDefault;
var
j: integer;
OldWriteMode, OldCurColor: word;
LineSets : LineSettingsType;
Begin
{ CP is always RELATIVE coordinates }
CurrentX := 0;
CurrentY := 0;
{ Save all old settings }
OldCurColor := CurrentColor;
CurrentColor:=CurrentBkColor;
OldWriteMode:=CurrentWriteMode;
GetLineSettings(LineSets);
{ reset to normal line style...}
SetLineStyle(SolidLn, 0, NormWidth);
{ routines are relative here...}
for J:=0 to ViewHeight do
HLine(0, ViewWidth, J);
{ restore old settings...}
SetLineStyle(LineSets.LineStyle, LineSets.Pattern, LineSets.Thickness);
CurrentColor := OldCurColor;
CurrentWriteMode := OldWriteMode;
end;
Procedure SetViewPort(X1, Y1, X2, Y2: Integer; Clip: Boolean);
Begin
if (X1 > GetMaxX) or (X2 > GetMaxX) or (X1 > X2) or (X1 < 0) then
Begin
_GraphResult := grError;
exit;
end;
if (Y1 > GetMaxY) or (Y2 > GetMaxY) or (Y1 > Y2) or (Y1 < 0) then
Begin
_GraphResult := grError;
exit;
end;
{ CP is always RELATIVE coordinates }
CurrentX := 0;
CurrentY := 0;
StartXViewPort := X1;
StartYViewPort := Y1;
ViewWidth := X2-X1;
ViewHeight:= Y2-Y1;
ClipPixels := Clip;
end;
procedure GetViewSettings(var viewport : ViewPortType);
begin
ViewPort.X1 := StartXViewPort;
ViewPort.Y1 := StartYViewPort;
ViewPort.X2 := ViewWidth - StartXViewPort;
ViewPort.Y2 := ViewHeight - StartYViewPort;
ViewPort.Clip := ClipPixels;
end;
procedure ClearDevice;
var
ViewPort: ViewPortType;
begin
{ Reset the CP }
CurrentX := 0;
CurrentY := 0;
{ save viewport }
ViewPort.X1 := StartXviewPort;
ViewPort.X2 := ViewWidth - StartXViewPort;
ViewPort.Y1 := StartYViewPort;
ViewPort.Y2 := ViewHeight - StartYViewPort;
ViewPort.Clip := ClipPixels;
{ put viewport to full screen }
StartXViewPort := 0;
ViewHeight := MaxY;
StartYViewPort := 0;
ViewWidth := MaxX;
ClipPixels := TRUE;
ClearViewPort;
{ restore old viewport }
StartXViewPort := ViewPort.X1;
ViewWidth := ViewPort.X2-ViewPort.X1;
StartYViewPort := ViewPort.Y1;
ViewHeight := ViewPort.Y2-ViewPort.Y1;
ClipPixels := ViewPort.Clip;
end;
{--------------------------------------------------------------------------}
{ }
{ BITMAP PUT/GET ROUTINES }
{ }
{--------------------------------------------------------------------------}
Procedure GetScanlineDefault (Y : Integer; Var Data);
{********************************************************}
{ Procedure GetScanLine() }
{--------------------------------------------------------}
{ Returns the full scanline of the video line of the Y }
{ coordinate. The values are returned in a WORD array }
{ each WORD representing a pixel of the specified scanline}
{********************************************************}
Var
Offset, x : Integer;
Begin
For x:=0 to MaxX Do Begin
WordArray(Data)[x]:=GetPixel(x, y);
End;
End;
Function DefaultImageSize(X1,Y1,X2,Y2: Integer): longint;
Begin
{ each pixel uses two bytes, to enable modes with colors up to 64K }
{ to work. }
DefaultImageSize := 12 + (((X2-X1)*(Y2-Y1))*2);
end;
Procedure DefaultPutImage(X,Y: Integer; var Bitmap; BitBlt: Word);
type
pt = array[0..32000] of word;
ptw = array[0..3] of longint;
var
color: word;
i,j: Integer;
Y1,X1: Integer;
k: integer;
Begin
X1:= ptw(Bitmap)[0]+X; { get width and adjust end coordinate accordingly }
Y1:= ptw(Bitmap)[1]+Y; { get height and adjust end coordinate accordingly }
k:= 12; { Three reserved longs at start of bitmap }
for j:=Y to Y1 do
Begin
for i:=X to X1 do
begin
case BitBlt of
{$R-}
CopyPut: color:= pt(Bitmap)[k]; { also = normalput }
XORPut: color:= pt(Bitmap)[k] XOR GetPixel(i,j);
OrPut: color:= pt(Bitmap)[k] OR GetPixel(i,j);
AndPut: color:= pt(Bitmap)[k] AND GetPixel(i,j);
NotPut: color:= not pt(Bitmap)[k];
{$R+}
end;
putpixel(i,j,color);
Inc(k);
end;
end;
end;
Procedure DefaultGetImage(X1,Y1,X2,Y2: Integer; Var Bitmap);
type
pt = array[0..32000] of word;
ptw = array[0..3] of longint;
var
i,j: integer;
k: longint;
Begin
k:= 12; { Three reserved longs at start of bitmap }
for j:=Y1 to Y2 do
Begin
for i:=X1 to X2 do
begin
{$R-}
pt(Bitmap)[k] :=getpixel(i,j);
{$R+}
Inc(k);
end;
end;
ptw(Bitmap)[0] := X2-X1; { First longint is width }
ptw(Bitmap)[1] := Y2-Y1; { Second longint is height }
ptw(bitmap)[2] := 0; { Third longint is reserved}
end;
Procedure GetArcCoords(var ArcCoords: ArcCoordsType);
Begin
ArcCoords.X := ArcCall.X;
ArcCoords.Y := ArcCall.Y;
ArcCoords.XStart := ArcCall.XStart;
ArcCoords.YStart := ArcCall.YStart;
ArcCoords.XEnd := ArcCall.XEnd;
ArcCoords.YEnd := ArcCall.YEnd;
end;
procedure SetVisualPage(page : word);
begin
end;
procedure SetActivePage(page : word);
begin
end;
Procedure DefaultHooks;
{********************************************************}
{ Procedure DefaultHooks() }
{--------------------------------------------------------}
{ Resets all hookable routine either to nil for those }
{ which need overrides, and others to defaults. }
{ This is called each time SetGraphMode() is called. }
{********************************************************}
Begin
{ All default hooks procedures }
{ required...}
DirectPutPixel := nil;
PutPixel := nil;
GetPixel := nil;
{ optional...}
ClearViewPort := ClearViewportDefault;
PutImage := DefaultPutImage;
GetImage := DefaultGetImage;
ImageSize := DefaultImageSize;
GraphFreeMemPtr := nil;
GraphGetMemPtr := nil;
GetScanLine := GetScanLineDefault;
Line := LineDefault;
InternalEllipse := InternalEllipseDefault;
PatternLine := PatternLineDefault;
HLine := HLineDefault;
VLine := VLineDefault;
end;
Procedure InitVars;
{********************************************************}
{ Procedure InitVars() }
{--------------------------------------------------------}
{ Resets all internal variables, and resets all }
{ overridable routines. }
{********************************************************}
Begin
InstalledFonts := 0;
{ Install standard fonts }
InstallUserFont('TRIP');
InstallUserFont('LITT');
InstallUserFont('SANS');
InstallUserFont('GOTH');
ArcCall.X := 0;
ArcCall.Y := 0;
ArcCall.XStart := 0;
ArcCall.YStart := 0;
ArcCall.XEnd := 0;
ArcCall.YEnd := 0;
{ Reset to default values }
IntCurrentMode := 0;
IntCurrentDriver := 0;
XAspect := 0;
YAspect := 0;
MaxX := 0;
MaxY := 0;
MaxColor := 0;
DefaultHooks;
end;
{$i modes.inc}
{$i graph.inc}
function InstallUserDriver(Name: string; AutoDetectPtr: Pointer): integer;
begin
_graphResult := grError;
end;
function RegisterBGIDriver(driver: pointer): integer;
begin
_graphResult := grError;
end;
{ ----------------------------------------------------------------- }
Procedure Arc(X,Y : Integer; StAngle,EndAngle,Radius: word);
var
OldWriteMode: word;
Begin
if (Radius = 0) then
Exit;
if (Radius = 1) then
begin
{ must use clipping ... }
{ don't need to explicitly set NormalPut mode }
{ because PutPixel only supports normal put }
PutPixel(X, Y,CurrentColor);
Exit;
end;
{ Only if we are using thickwidths lines do we accept }
{ XORput write modes. }
OldWriteMode := CurrentWriteMode;
if (LineInfo.Thickness = NormWidth) then
CurrentWriteMode := NormalPut;
InternalEllipse(X,Y,Radius,Radius,StAngle,Endangle);
CurrentWriteMode := OldWriteMode;
end;
procedure Ellipse(X,Y : Integer; stAngle, EndAngle: word; XRadius,YRadius: word);
Begin
InternalEllipse(X,Y,XRadius,YRadius,stAngle,EndAngle);
end;
procedure FillEllipse(X, Y: Integer; XRadius, YRadius: Word);
{********************************************************}
{ Procedure FillEllipse() }
{--------------------------------------------------------}
{ Draws a filled ellipse using (X,Y) as a center point }
{ and XRadius and YRadius as the horizontal and vertical }
{ axes. The ellipse is filled with the current fill color}
{ and fill style, and is bordered with the current color.}
{--------------------------------------------------------}
{ Important notes: }
{ - CONTRRARY to VGA BGI - SetWriteMode DOES not }
{ affect the contour of the ellipses. BGI mode }
{ supports XORPut but the FloodFill() is still bounded}
{ by the ellipse. In OUR case, XOR Mode is simply }
{ not supported. }
{********************************************************}
var
OldWriteMode: Word;
begin
{ only normal put supported }
OldWriteMode := CurrentWriteMode;
CurrentWriteMode := NormalPut;
InternalEllipse(X,Y,XRadius,YRadius,0,360);
FloodFill(X,Y,CurrentColor);
{ restore old write mode }
CurrentWriteMode := OldWriteMode;
end;
procedure Circle(X, Y: Integer; Radius:Word);
{********************************************************}
{ Draws a circle centered at X,Y with the given Radius. }
{********************************************************}
{ Important notes: }
{ - Thickwidth circles use the current write mode, while}
{ normal width circles ALWAYS use CopyPut/NormalPut }
{ mode. (Tested against VGA BGI driver -CEC 13/Aug/99 }
{********************************************************}
var OriginalArcInfo: ArcCoordsType;
OldWriteMode: word;
begin
if (Radius = 0) then
Exit;
if (Radius = 1) then
begin
{ only normal put mode is supported by a call to PutPixel }
PutPixel(X, Y, CurrentColor);
Exit;
end;
{ save state of arc information }
{ because it is not needed for }
{ a circle call. }
move(ArcCall,OriginalArcInfo, sizeof(ArcCall));
if LineInfo.Thickness = Normwidth then
begin
OldWriteMode := CurrentWriteMode;
CurrentWriteMode := CopyPut;
end;
InternalEllipse(X,Y,Radius,Radius,0,360);
if LineInfo.Thickness = Normwidth then
CurrentWriteMode := OldWriteMode;
{ restore arc information }
move(OriginalArcInfo, ArcCall,sizeof(ArcCall));
end;
procedure Sector(x, y: Integer; StAngle,EndAngle, XRadius, YRadius: Word);
var angle : real;
writemode : word;
begin
Ellipse(x,y,stAngle,endAngle,XRadius,YRadius);
{ As in the TP graph unit - the line settings are used to }
{ define the outline of the sector. }
writemode:=Currentwritemode;
Currentwritemode:=normalput;
Line(ArcCall.XStart, ArcCall.YStart, x,y);
Line(x,y,ArcCall.Xend,ArcCall.YEnd);
{ we must take care of clipping so we call PutPixel instead }
{ of DirectPutPixel... }
PutPixel(ArcCall.xstart,ArcCall.ystart,CurrentColor);
PutPixel(x,y,CurrentColor);
PutPixel(ArcCall.xend,ArcCall.yend,CurrentColor);
stangle:=Stangle mod 360; EndAngle:=Endangle mod 360;
if stAngle<=Endangle then
Angle:=(stAngle+EndAngle)/2
else
angle:=(stAngle-360+EndAngle)/2;
{ fill from the point in the middle of the slice }
XRadius:=(longint(XRadius)*10000) div XAspect;
YRadius:=(longint(YRadius)*10000) div YAspect;
{ avoid rounding errors }
if abs(ArcCall.xstart-ArcCall.xend)
+abs(ArcCall.ystart-ArcCall.yend)>2 then
FloodFill(x+round(sin((angle+90)*Pi/180)*XRadius/2),
y+round(cos((angle+90)*Pi/180)*YRadius/2),CurrentColor);
CurrentWriteMode := writemode;
end;
procedure SetFillStyle(Pattern : word; Color: word);
begin
{ on invalid input, the current fill setting will be }
{ unchanged. }
if (Pattern > UserFill) or (Color > GetMaxColor) then
begin
_GraphResult := grError;
exit;
end;
FillSettings.Color := Color;
FillSettings.Pattern := Pattern;
end;
procedure SetFillPattern(Pattern: FillPatternType; Color: word);
{********************************************************}
{ Changes the Current FillPattern to a user defined }
{ pattern and changes also the current fill color. }
{ The FillPattern is saved in the FillPattern array so }
{ it can still be used with SetFillStyle(UserFill,Color) }
{********************************************************}
var
i: integer;
begin
if Color > GetMaxColor then
begin
_GraphResult := grError;
exit;
end;
FillSettings.Color := Color;
FillSettings.Pattern := UserFill;
{ Save the pattern in the buffer }
For i:=1 to 8 do
FillPatternTable[UserFill][i] := Pattern[i];
end;
procedure Bar(x1,y1,x2,y2:integer);
{********************************************************}
{ Important notes for compatibility with BP: }
{ - WriteMode is always CopyPut }
{ - No contour is drawn for the lines }
{********************************************************}
var y : Integer;
origcolor : longint;
origlinesettings: Linesettingstype;
origwritemode : Integer;
begin
origlinesettings:=lineinfo;
origcolor:=CurrentColor;
{ Always copy mode for Bars }
origwritemode := CurrentWriteMode;
CurrentWriteMode := CopyPut;
{ All lines used are of this style }
Lineinfo.linestyle:=solidln;
Lineinfo.thickness:=normwidth;
case Fillsettings.pattern of
EmptyFill :
begin
Currentcolor:=CurrentBkColor;
for y:=y1 to y2 do
Hline(x1,x2,y);
end;
SolidFill :
begin
CurrentColor:=FillSettings.color;
for y:=y1 to y2 do
Hline(x1,x2,y);
end;
else
Begin
CurrentColor:=FillSettings.color;
for y:=y1 to y2 do
patternline(x1,x2,y);
end;
end;
CurrentColor:= Origcolor;
LineInfo := OrigLineSettings;
CurrentWriteMode := OrigWritemode;
end;
procedure bar3D(x1, y1, x2, y2 : integer;depth : word;top : boolean);
var
origwritemode : integer;
OldX, OldY : integer;
begin
origwritemode := CurrentWriteMode;
CurrentWriteMode := CopyPut;
Bar(x1,y1,x2,y2);
Rectangle(x1,y1,x2,y2);
{ Current CP should not be updated in Bar3D }
{ therefore save it and then restore it on }
{ exit. }
OldX := CurrentX;
OldY := CurrentY;
if top then begin
Moveto(x1,y1);
Lineto(x1+depth,y1-depth);
Lineto(x2+depth,y1-depth);
Lineto(x2,y1);
end;
if Depth <> 0 then
Begin
Moveto(x2+depth,y1-depth);
Lineto(x2+depth,y2-depth);
Lineto(x2,y2);
end;
{ restore CP }
CurrentX := OldX;
CurrentY := OldY;
CurrentWriteMode := origwritemode;
end;
{--------------------------------------------------------------------------}
{ }
{ COLOR AND PALETTE ROUTINES }
{ }
{--------------------------------------------------------------------------}
procedure SetColor(Color: Word);
Begin
CurrentColor := Color;
end;
function GetColor: Word;
Begin
GetColor := CurrentColor;
end;
function GetBkColor: Word;
Begin
GetBkColor := CurrentBkColor;
end;
procedure SetBkColor(ColorNum: Word);
{ Background color means background screen color in this case, and it is }
{ INDEPENDANT of the viewport settings, so we must clear the whole screen }
{ with the color. }
var
ViewPort: ViewportType;
Begin
GetViewSettings(Viewport);
SetViewPort(0,0,MaxX,MaxY,FALSE);
CurrentBkColor := ColorNum;
ClearViewPort;
SetViewport(ViewPort.X1,Viewport.Y1,Viewport.X2,Viewport.Y2,Viewport.Clip);
end;
function GetMaxColor: word;
{ Checked against TP VGA driver - CEC }
begin
GetMaxColor:=MaxColor-1; { based on an index of zero so subtract one }
end;
Procedure MoveRel(Dx, Dy: Integer);
Begin
CurrentX := CurrentX + Dx;
CurrentY := CurrentY + Dy;
end;
Procedure MoveTo(X,Y: Integer);
{********************************************************}
{ Procedure MoveTo() }
{--------------------------------------------------------}
{ Moves the current pointer in VIEWPORT relative }
{ coordinates to the specified X,Y coordinate. }
{********************************************************}
Begin
CurrentX := X;
CurrentY := Y;
end;
function GraphErrorMsg(ErrorCode: Integer): string;
Begin
GraphErrorMsg:='';
case ErrorCode of
grOk,grFileNotFound,grInvalidDriver: exit;
grNoInitGraph: GraphErrorMsg:='Graphics driver not installed';
grNotDetected: GraphErrorMsg:='Graphics hardware not detected';
grNoLoadMem,grNoScanMem,grNoFloodMem: GraphErrorMsg := 'Not enough memory for graphics';
grNoFontMem: GraphErrorMsg := 'Not enough memory to load font';
grFontNotFound: GraphErrorMsg:= 'Font file not found';
grInvalidMode: GraphErrorMsg := 'Invalid graphics mode';
grError: GraphErrorMsg:='Graphics error';
grIoError: GraphErrorMsg:='Graphics I/O error';
grInvalidFont,grInvalidFontNum: GraphErrorMsg := 'Invalid font';
grInvalidVersion: GraphErrorMsg:='Invalid driver version';
end;
end;
Function GetMaxX: Integer;
{ Routine checked against VGA driver - CEC }
Begin
GetMaxX := MaxX;
end;
Function GetMaxY: Integer;
{ Routine checked against VGA driver - CEC }
Begin
GetMaxY := MaxY;
end;
Function GraphResult: Integer;
Begin
GraphResult := _GraphResult;
_GraphResult := grOk;
end;
Function GetX: Integer;
Begin
GetX := CurrentX;
end;
Function GetY: Integer;
Begin
GetY := CurrentY;
end;
Function GetDriverName: string;
var
mode: PModeInfo;
begin
GetDriverName:=DriverName;
end;
procedure graphdefaults;
{ PS: GraphDefaults does not ZERO the ArcCall structure }
{ so a call to GetArcCoords will not change even the }
{ returned values even if GraphDefaults is called in }
{ between. }
var
i: integer;
begin
lineinfo.linestyle:=solidln;
lineinfo.thickness:=normwidth;
{ reset line style pattern }
for i:=0 to 15 do
LinePatterns[i] := TRUE;
{ By default, according to the TP prog's reference }
{ the default pattern is solid, and the default }
{ color is the maximum color in the palette. }
fillsettings.color:=GetMaxColor;
fillsettings.pattern:=solidfill;
{ GraphDefaults resets the User Fill pattern to $ff }
{ checked with VGA BGI driver - CEC }
for i:=1 to 8 do
FillPatternTable[UserFill][i] := $ff;
CurrentColor:=white;
SetBkColor(Black);
ClipPixels := TRUE;
{ Reset the viewport }
StartXViewPort := 0;
StartYViewPort := 0;
ViewWidth := MaxX;
ViewHeight := MaxY;
{ Reset CP }
CurrentX := 0;
CurrentY := 0;
{ normal write mode }
CurrentWriteMode := CopyPut;
{ Schriftart einstellen }
CurrentTextInfo.font := DefaultFont;
CurrentTextInfo.direction:=HorizDir;
CurrentTextInfo.charsize:=1;
CurrentTextInfo.horiz:=LeftText;
CurrentTextInfo.vert:=TopText;
XAspect:=10000; YAspect:=10000;
end;
procedure GetAspectRatio(var Xasp,Yasp : word);
begin
XAsp:=XAspect;
YAsp:=YAspect;
end;
procedure SetAspectRatio(Xasp, Yasp : word);
begin
Xaspect:= XAsp;
YAspect:= YAsp;
end;
procedure SetWriteMode(WriteMode : integer);
begin
if (writemode<>xorput) and (writemode<>CopyPut) then
exit;
CurrentWriteMode := WriteMode;
end;
procedure GetFillSettings(var Fillinfo:Fillsettingstype);
begin
Fillinfo:=Fillsettings;
end;
procedure GetFillPattern(var FillPattern:FillPatternType);
begin
FillPattern:=FillpatternTable[UserFill];
end;
procedure DrawPoly(numpoints : word;var polypoints);
type
ppointtype = ^pointtype;
pt = array[0..16000] of pointtype;
var
i : longint;
begin
if numpoints < 2 then
begin
_GraphResult := grError;
exit;
end;
for i:=0 to numpoints-2 do
line(pt(polypoints)[i].x,
pt(polypoints)[i].y,
pt(polypoints)[i+1].x,
pt(polypoints)[i+1].y);
end;
procedure PieSlice(X,Y,stangle,endAngle:integer;Radius: Word);
var angle : real;
XRadius, YRadius : word;
writemode : word;
begin
Arc(x,y,StAngle,EndAngle,Radius);
Line(ArcCall.XStart, ArcCall.YStart, x,y);
Line(x,y, ArcCall.XEnd, ArcCall.YEnd);
{ must use PutPixel() instead of DirectPutPixel because we need }
{ clipping... }
PutPixel(ArcCall.xstart,ArcCall.ystart,CurrentColor);
PutPixel(x,y,CurrentColor);
PutPixel(ArcCall.xend,ArcCall.yend,CurrentColor);
Stangle:=stAngle mod 360; EndAngle:=Endangle mod 360;
if Stangle<=Endangle then
angle:=(StAngle+EndAngle)/2
else
angle:=(Stangle-360+Endangle)/2;
{ fill from the point in the middle of the slice }
XRadius:=(longint(Radius)*10000) div XAspect;
YRadius:=(longint(Radius)*10000) div YAspect;
{ avoid rounding errors }
if abs(ArcCall.xstart-ArcCall.xend)
+abs(ArcCall.ystart-ArcCall.yend)>2 then
{ FloodFill(x+round(sin((angle+90)*Pi/180)*XRadius/2),
y+round(cos((angle+90)*Pi/180)*YRadius/2),truecolor);}
CurrentWriteMode := writemode;
end;
{$i fills.inc}
{$i text.inc}
procedure InitGraph(var GraphDriver:Integer;var GraphMode:Integer;
const PathToDriver:String);
var i,index:Integer;
LoMode, HiMode: Integer;
CpyMode: Integer;
CpyDriver: Integer;
begin
{ path to the fonts (where they will be searched)...}
bgipath:=PathToDriver;
if bgipath[length(bgipath)]<>'\' then
bgipath:=bgipath+'\';
{ make sure our driver list is setup...}
QueryAdapterInfo;
if not assigned(SaveVideoState) then
RunError(216);
SaveVideoState;
InitVars;
DriverName:=InternalDriverName; { DOS Graphics driver }
if (Graphdriver=Detect) then
begin
HiMode := -1;
LoMode := -1;
{ We start at VGA-1 }
GraphDriver := VGA;
CpyMode := 0;
{ search all possible graphic drivers in ascending order...}
{ usually the new driver numbers indicate newest hardware...}
{ Internal driver numbers start at VGA=9 }
repeat
GetModeRange(GraphDriver,LoMode,HiMode);
{ save the highest mode possible...}
if HiMode = -1 then break;
CpyMode:=HiMode;
CpyDriver:=GraphDriver;
{ go to next driver if it exists...}
Inc(GraphDriver);
until (CpyMode=-1);
IntCurrentDriver := CpyDriver;
{ If this is equal to -1 then no graph mode possible...}
if CpyMode = -1 then
begin
_GraphResult := grNotDetected;
exit;
end;
{ Actually set the graph mode...}
SetGraphMode(CpyMode);
end
else
begin
{ Search if that graphics modec actually exists...}
if SearchMode(GraphDriver,GraphMode) = nil then
begin
_GraphResult := grInvalidMode;
exit;
end
else
begin
IntCurrentDriver := GraphDriver;
SetGraphMode(GraphMode);
end;
end;
end;
var
ExitSave: pointer;
begin
ModeList := nil;
SaveVideoState := nil;
RestoreVideoState := nil;
{ This must be called at startup... because GetGraphMode may }
{ be called even when not in graph mode. }
QueryAdapterInfo;
{ This installs an exit procedure which cleans up the mode list...}
ExitSave := ExitProc;
ExitProc := @CleanMode;
end.
GetDefaultPalette
GetPalette
GetPaletteSize
PieSlice
Sector
SetActivePage
SetAllPalette
SetGraphBufSize
SetBkColor
SetPalette
SetRGBPalette
SetVisualPage
DetectGraph
{ DetectGraph() }
{ GetPalette() }
{ SetAllPalette() }
{ SetPalette() }
{ SetVisualPage() }
{ SetActivePage() }
{ SetBkColor() }
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