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fpvectorial: Starts moving the font drawing to the top of the curve

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git-svn-id: trunk@49010 -
This commit is contained in:
sekelsenmat 2015-05-13 10:03:56 +00:00
parent fa18a10e3c
commit ad069894f5
2 changed files with 18 additions and 2 deletions
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19
components/fpvectorial/fpvectorial.pas
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@ -283,7 +283,7 @@ type
Next: TPathSegment;
// mathematical methods
function GetLength(): Double; virtual;
function GetPointAndTangentForDistance(ADistance: Double; out AX, AY, ATangentAngle: Double): Boolean; virtual;
function GetPointAndTangentForDistance(ADistance: Double; out AX, AY, ATangentAngle: Double): Boolean; virtual; // ATangentAngle in radians
function GetStartPoint(out APoint: T3DPoint): Boolean;
// edition methods
procedure Move(ADeltaX, ADeltaY: Double); virtual;
@ -3515,6 +3515,7 @@ end;
// Walk is walking a distance in the path and obtaining the point where we land and the current tangent
// Returns true if successful, false otherwise
// ATangentAngle - In radians
function TPath.NextWalk(ADistance: Double; out AX, AY, ATangentAngle: Double): Boolean;
var
lCurPoint: TPathSegment;
@ -4289,12 +4290,19 @@ procedure TvCurvedText.Render(ADest: TFPCustomCanvas;
var
i, lCharLen: Integer;
lText, lUTF8Char: string;
lX, lY, lTangentAngle: Double;
lX, lY, lTangentAngle, lTextHeight: Double;
//lLeft, lTop, lWidth, lHeight: Integer;
begin
inherited Render(ADest, ARenderInfo, ADestX, ADestY, AMulX, AMulY, False);
InitializeRenderInfo(ARenderInfo);
if not ADoDraw then
begin
//Path.CalculateSizeInCanvas(ADest, lLeft, lTop, lWidth, lHeight);
Exit;
end;
// Don't draw anything if we have alpha=zero
if Font.Color.Alpha = 0 then Exit;
if Path = nil then Exit;
@ -4311,6 +4319,13 @@ begin
for i := 0 to UTF8Length(lText)-1 do
begin
lUTF8Char := UTF8Copy(lText, i+1, 1);
ADest.Font.Orientation := Round(Math.radtodeg(lTangentAngle)*10);
// Without adjustment the text is down bellow the path, but we want it on top of it
lTextHeight := Abs(AMulY) * ADest.TextHeight(lUTF8Char);
lX := lX - Sin(Pi / 2 - lTangentAngle) * lTextHeight;
lY := lY + Cos(Pi / 2 - lTangentAngle) * lTextHeight;
ADest.TextOut(CoordToCanvasX(lX), CoordToCanvasY(lY), lUTF8Char);
lCharLen := ADest.TextWidth(lUTF8Char);
Path.NextWalk(lCharLen, lX, lY, lTangentAngle);

1
components/fpvectorial/fpvutils.pas
View File

@ -231,6 +231,7 @@ begin
end;
// (x2,y2)=(x1+L⋅cos(a),y1+L⋅sin(a)).
// ATangentAngle - in Radians
function LineEquation_GetPointAndTangentForLength(AStart, AEnd: T3DPoint; ADistance: Double; out AX, AY, ATangentAngle: Double): Boolean;
var
lLineAngle: Double; // to X axis