TAChart: create new demo runtime/chartstyles to show how to add/delete chartstyles at runtime (see http://forum.lazarus.freepascal.org/index.php/topic,35538.0.html)

git-svn-id: trunk@53991 -
2025-08-10 05:56:02 +02:00 · 2017-01-24 11:53:18 +00:00 · 2017-01-24 11:53:18 +00:00 · 14d17cd1e7
commit 14d17cd1e7
parent abd19309ef
6 changed files with 395 additions and 0 deletions
--- a/.gitattributes
+++ b/.gitattributes
@ -4331,6 +4331,11 @@ components/tachart/demo/rotate/Main.lfm svneol=native#text/pascal
 components/tachart/demo/rotate/Main.pas svneol=native#text/pascal
 components/tachart/demo/rotate/rotatedemo.lpi svneol=native#text/plain
 components/tachart/demo/rotate/rotatedemo.lpr svneol=native#text/pascal
+components/tachart/demo/runtime/chartstyles/project1.lpi svneol=native#text/plain
+components/tachart/demo/runtime/chartstyles/project1.lpr svneol=native#text/plain
+components/tachart/demo/runtime/chartstyles/readme.txt svneol=native#text/plain
+components/tachart/demo/runtime/chartstyles/unit1.lfm svneol=native#text/plain
+components/tachart/demo/runtime/chartstyles/unit1.pas svneol=native#text/plain
 components/tachart/demo/save/main.lfm svneol=native#text/plain
 components/tachart/demo/save/main.pas svneol=native#text/plain
 components/tachart/demo/save/savedemo.lpi svneol=native#text/plain
--- a/components/tachart/demo/runtime/chartstyles/project1.lpi
+++ b/components/tachart/demo/runtime/chartstyles/project1.lpi
@ -0,0 +1,86 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<CONFIG>
+  <ProjectOptions>
+    <Version Value="10"/>
+    <PathDelim Value="\"/>
+    <General>
+      <SessionStorage Value="InProjectDir"/>
+      <MainUnit Value="0"/>
+      <Title Value="project1"/>
+      <ResourceType Value="res"/>
+      <UseXPManifest Value="True"/>
+      <Icon Value="0"/>
+    </General>
+    <BuildModes Count="1">
+      <Item1 Name="Default" Default="True"/>
+    </BuildModes>
+    <PublishOptions>
+      <Version Value="2"/>
+    </PublishOptions>
+    <RunParams>
+      <local>
+        <FormatVersion Value="1"/>
+      </local>
+    </RunParams>
+    <RequiredPackages Count="2">
+      <Item1>
+        <PackageName Value="TAChartLazarusPkg"/>
+      </Item1>
+      <Item2>
+        <PackageName Value="LCL"/>
+      </Item2>
+    </RequiredPackages>
+    <Units Count="3">
+      <Unit0>
+        <Filename Value="project1.lpr"/>
+        <IsPartOfProject Value="True"/>
+      </Unit0>
+      <Unit1>
+        <Filename Value="unit1.pas"/>
+        <IsPartOfProject Value="True"/>
+        <ComponentName Value="Form1"/>
+        <HasResources Value="True"/>
+        <ResourceBaseClass Value="Form"/>
+        <UnitName Value="Unit1"/>
+      </Unit1>
+      <Unit2>
+        <Filename Value="readme.txt"/>
+        <IsPartOfProject Value="True"/>
+      </Unit2>
+    </Units>
+  </ProjectOptions>
+  <CompilerOptions>
+    <Version Value="11"/>
+    <PathDelim Value="\"/>
+    <Target>
+      <Filename Value="project1"/>
+    </Target>
+    <SearchPaths>
+      <IncludeFiles Value="$(ProjOutDir)"/>
+      <UnitOutputDirectory Value="lib\$(TargetCPU)-$(TargetOS)"/>
+    </SearchPaths>
+    <Linking>
+      <Debugging>
+        <UseExternalDbgSyms Value="True"/>
+      </Debugging>
+      <Options>
+        <Win32>
+          <GraphicApplication Value="True"/>
+        </Win32>
+      </Options>
+    </Linking>
+  </CompilerOptions>
+  <Debugging>
+    <Exceptions Count="3">
+      <Item1>
+        <Name Value="EAbort"/>
+      </Item1>
+      <Item2>
+        <Name Value="ECodetoolError"/>
+      </Item2>
+      <Item3>
+        <Name Value="EFOpenError"/>
+      </Item3>
+    </Exceptions>
+  </Debugging>
+</CONFIG>
--- a/components/tachart/demo/runtime/chartstyles/project1.lpr
+++ b/components/tachart/demo/runtime/chartstyles/project1.lpr
@ -0,0 +1,21 @@
+program project1;
+
+{$mode objfpc}{$H+}
+
+uses
+  {$IFDEF UNIX}{$IFDEF UseCThreads}
+  cthreads,
+  {$ENDIF}{$ENDIF}
+  Interfaces, // this includes the LCL widgetset
+  Forms, Unit1, tachartlazaruspkg
+  { you can add units after this };
+
+{$R *.res}
+
+begin
+  RequireDerivedFormResource := True;
+  Application.Initialize;
+  Application.CreateForm(TForm1, Form1);
+  Application.Run;
+end.
+
--- a/components/tachart/demo/runtime/chartstyles/readme.txt
+++ b/components/tachart/demo/runtime/chartstyles/readme.txt
@ -0,0 +1,21 @@
+This project shows how to add and delete levels to a stacked bar series
+at runtime. For every new level, a new chart style is created, and for
+every deleted level, the corresponding chart style is deleted as well.
+
+Background info on ChartStyles at runtime:
+- The TChartStyles component houses a collection named Styles which contains
+  all styles. Therefore, you simply call ChartStyles1.Styles.Add to create a
+  new ChartStyle and add it to the collection. The Add method returns a pointer
+  to the newly created collectionitem; you must cast it TChartStyle to get
+  access to its properties.
+- In order to delete a style just call the Delete method of the collection with
+  the index of the corresponding style.
+
+Instructions for running the demo:
+- Click "Add bar" to add new data points (bars)
+- Click "Add level" to add a new level to the stacked bars
+- Click "Delete selected" to remove the level selected in the listbox from the series.
+
+See also:
+- http://forum.lazarus.freepascal.org/index.php/topic,35538.0.html
+
--- a/components/tachart/demo/runtime/chartstyles/unit1.lfm
+++ b/components/tachart/demo/runtime/chartstyles/unit1.lfm
@ -0,0 +1,117 @@
+object Form1: TForm1
+  Left = 280
+  Height = 334
+  Top = 130
+  Width = 725
+  Caption = 'Form1'
+  ClientHeight = 334
+  ClientWidth = 725
+  LCLVersion = '1.7'
+  object Chart1: TChart
+    Left = 0
+    Height = 296
+    Top = 0
+    Width = 601
+    AxisList = <    
+      item
+        Grid.Color = clSilver
+        Grid.Style = psSolid
+        Minors = <>
+        Title.LabelFont.Orientation = 900
+      end    
+      item
+        Grid.Visible = False
+        Alignment = calBottom
+        Minors = <>
+      end>
+    BackColor = clWhite
+    Foot.Brush.Color = clBtnFace
+    Foot.Font.Color = clBlue
+    Legend.Visible = True
+    Title.Brush.Color = clBtnFace
+    Title.Font.Color = clBlue
+    Title.Text.Strings = (
+      'TAChart'
+    )
+    Align = alClient
+    object Chart1BarSeries1: TBarSeries
+      Legend.Multiplicity = lmStyle
+      BarBrush.Color = clRed
+      Source = CalculatedChartSource1
+      Styles = ChartStyles1
+    end
+  end
+  object Panel1: TPanel
+    Left = 0
+    Height = 38
+    Top = 296
+    Width = 725
+    Align = alBottom
+    BevelOuter = bvNone
+    ClientHeight = 38
+    ClientWidth = 725
+    TabOrder = 1
+    object BtnAddBar: TButton
+      Left = 11
+      Height = 25
+      Top = 4
+      Width = 75
+      Caption = 'Add bar'
+      OnClick = BtnAddBarClick
+      TabOrder = 0
+    end
+    object BtnAddLevel: TButton
+      Left = 99
+      Height = 25
+      Top = 4
+      Width = 75
+      Caption = 'Add level'
+      OnClick = BtnAddLevelClick
+      TabOrder = 1
+    end
+    object CbPercent: TCheckBox
+      Left = 191
+      Height = 19
+      Top = 7
+      Width = 48
+      Caption = '100%'
+      OnChange = CbPercentChange
+      TabOrder = 2
+    end
+    object BtnDelete: TButton
+      Left = 610
+      Height = 25
+      Top = 4
+      Width = 107
+      Anchors = [akTop, akRight]
+      Caption = 'Delete selected'
+      Enabled = False
+      OnClick = BtnDeleteClick
+      TabOrder = 3
+    end
+  end
+  object ListBox1: TListBox
+    Left = 609
+    Height = 280
+    Top = 8
+    Width = 108
+    Align = alRight
+    BorderSpacing.Around = 8
+    ItemHeight = 0
+    TabOrder = 2
+  end
+  object ListChartSource1: TListChartSource
+    left = 117
+    top = 57
+  end
+  object CalculatedChartSource1: TCalculatedChartSource
+    Origin = ListChartSource1
+    left = 116
+    top = 112
+  end
+  object ChartStyles1: TChartStyles
+    Styles = <>
+    left = 268
+    top = 58
+  end
+end
--- a/components/tachart/demo/runtime/chartstyles/unit1.pas
+++ b/components/tachart/demo/runtime/chartstyles/unit1.pas
@ -0,0 +1,145 @@
+unit Unit1;
+
+{$mode objfpc}{$H+}
+
+interface
+
+uses
+  Classes, SysUtils, FileUtil, Forms, Controls, Graphics, Dialogs,
+  ExtCtrls, StdCtrls,
+  TAGraph, TASeries, TAStyles, TASources, TAChartListbox;
+
+type
+
+  { TForm1 }
+
+  TForm1 = class(TForm)
+    BtnAddBar: TButton;
+    BtnAddLevel: TButton;
+    BtnDelete: TButton;
+    CalculatedChartSource1: TCalculatedChartSource;
+    Chart1: TChart;
+    Chart1BarSeries1: TBarSeries;
+    CbPercent: TCheckBox;
+    ChartStyles1: TChartStyles;
+    ListBox1: TListBox;
+    ListChartSource1: TListChartSource;
+    Panel1: TPanel;
+    procedure BtnAddBarClick(Sender: TObject);
+    procedure BtnAddLevelClick(Sender: TObject);
+    procedure BtnDeleteClick(Sender: TObject);
+    procedure CbPercentChange(Sender: TObject);
+  private
+
+  public
+
+  end;
+
+var
+  Form1: TForm1;
+
+implementation
+
+{$R *.lfm}
+
+{ TForm1 }
+
+const
+  N = 5;
+
+procedure TForm1.BtnAddBarClick(Sender: TObject);
+var
+  x, y: Double;
+  i, n: Integer;
+  style: TChartStyle;
+begin
+  x := ListChartSource1.Count;
+  y := Random * 0.9 + 0.1;   // Random number between 0.1 and 1.0
+  n := ListChartSource1.Add(x, y);
+  for i:=0 to ListChartSource1.YCount-2 do
+    ListChartSource1.Item[n]^.YList[i] := random;
+
+  if ChartStyles1.Styles.Count = 0 then begin
+    style := TChartStyle(ChartStyles1.Styles.Add);
+    style.Brush.Color := RgbToColor(random(256), random(256), random(256));
+    style.Text := 'Y';
+
+    Listbox1.Items.Add(style.Text);
+  end;
+
+  BtnDelete.Enabled := true;
+end;
+
+procedure TForm1.BtnAddLevelClick(Sender: TObject);
+var
+  yidx: Integer;
+  i: Integer;
+  style: TChartStyle;
+begin
+  // Increment the number of y values and add random data to the new y value
+  ListChartSource1.BeginUpdate;
+  try
+    yidx := ListChartSource1.YCount - 1;
+    ListChartSource1.YCount := ListChartSource1.YCount + 1;
+    for i := 0 to ListChartSource1.Count-1 do
+      ListChartSource1.Item[i]^.YList[yidx] := random;
+  finally
+    ListChartSource1.EndUpdate;
+  end;
+
+  style := TChartStyle(ChartStyles1.Styles.Add);
+  style.Brush.Color := RgbToColor(random(256), random(256), random(256));
+  style.Text := 'YList[' + IntToStr(yidx) + ']';
+
+  Listbox1.Items.Add(style.Text);
+  Listbox1.ItemIndex := Listbox1.Items.Count - 1;
+
+  BtnDelete.Enabled := true;
+end;
+
+procedure TForm1.BtnDeleteClick(Sender: TObject);
+var
+  idx: Integer;  // Index of level to be deleted
+  i, j: Integer;
+begin
+  idx := Listbox1.ItemIndex;
+
+  if (ListChartSource1.YCount = 1) then begin
+    ListChartSource1.Clear;
+    exit;
+  end;
+
+  // Delete level in Listsource
+  ListChartSource1.BeginUpdate;
+  try
+    for i := 0 to ListChartSource1.Count-1 do begin
+      if idx = 0 then
+        ListChartSource1.Item[i]^.Y := ListChartSource1.Item[i]^.YList[0];
+      for j:=idx to ListChartSource1.YCount-3 do
+        ListChartSource1.Item[i]^.YList[j] := ListChartSource1.Item[i]^.YList[j+1];
+    end;
+    ListChartSource1.YCount := ListChartSource1.YCount - 1;
+  finally
+    ListChartSource1.EndUpdate;
+  end;
+
+  // Delete level in ChartStyles
+  ChartStyles1.Styles.Delete(idx);
+
+  // Delete item in Listbox
+  Listbox1.Items.Delete(idx);
+  if idx < Listbox1.Items.Count then
+    Listbox1.ItemIndex := idx
+  else
+    Listbox1.ItemIndex := Listbox1.Items.Count - 1;
+
+  BtnDelete.Enabled := Listbox1.Items.Count > 0;
+end;
+
+procedure TForm1.CbPercentChange(Sender: TObject);
+begin
+  CalculatedChartSource1.Percentage := CbPercent.Checked;
+end;
+
+end.
+