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 程式師世界 >> 編程語言 >> 更多編程語言 >> Delphi >> 再學GDI+[70]: 路徑畫刷(10) - SetBlend

再學GDI+[70]: 路徑畫刷(10) - SetBlend

編輯:Delphi

本例效果圖:

代碼文件:unit Unit1;
interface
uses
 Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
 Dialogs, ComCtrls, StdCtrls, ExtCtrls;
type
 TForm1 = class(TForm)
  TrackBar1: TTrackBar;
  TrackBar2: TTrackBar;
  TrackBar3: TTrackBar;
  TrackBar4: TTrackBar;
  TrackBar5: TTrackBar;
  TrackBar6: TTrackBar;
  procedure FormPaint(Sender: TObject);
  procedure FormCreate(Sender: TObject);
  procedure TrackBar1Change(Sender: TObject);
  procedure TrackBar2Change(Sender: TObject);
  procedure TrackBar3Change(Sender: TObject);
  procedure TrackBar4Change(Sender: TObject);
  procedure TrackBar5Change(Sender: TObject);
  procedure TrackBar6Change(Sender: TObject);
 end;
var
 Form1: TForm1;
implementation
{$R *.dfm}
uses GDIPOBJ, GDIPAPI;
procedure TForm1.FormCreate(Sender: TObject);
begin
 TrackBar1.Max := 10;
 TrackBar2.Max := 10;
 TrackBar3.Max := 10;
 TrackBar4.Max := 10;
 TrackBar5.Max := 10;
 TrackBar6.Max := 10;
 TrackBar1.Position := TrackBar1.Max;
 TrackBar2.Position := TrackBar2.Min;
 TrackBar3.Position := TrackBar3.Max;
 TrackBar4.Position := TrackBar4.Min;
 TrackBar5.Position := TrackBar5.Max div 2;
 TrackBar6.Position := TrackBar6.Max;
end;
procedure TForm1.FormPaint(Sender: TObject);
const
 pts: array[0..2] of TGPPoint = ((X:120; Y:10), (X:40; Y:140), (X:200;Y:140));
 colors: array[0..2] of TGPColor = (aclRed, aclGreen, aclYellow);
var
 g: TGPGraphics;
 path: TGPGraphicsPath;
 pb: TGPPathGradientBrush;
 blendFactors: array[0..2] of Single;
 pos: array[0..2] of Single;
 num: Integer;
begin
 g := TGPGraphics.Create(Canvas.Handle);
 path := TGPGraphicsPath.Create;
 path.AddPolygon(PGPPoint(@pts), Length(pts));
 pb := TGPPathGradientBrush.Create(path);
 num := Length(colors);
 pb.SetSurroundColors(@colors, num); {SetBlend 只在設置包圍顏色時有效}
 blendFactors[0] := TrackBar1.Position / 10;
 blendFactors[1] := TrackBar2.Position / 10;
 blendFactors[2] := TrackBar3.Position / 10;
 pos[0] := TrackBar4.Position / 10;
 pos[1] := TrackBar5.Position / 10;
 pos[2] := TrackBar6.Position / 10;
 pb.SetBlend(@blendFactors, Psingle(@pos), Length(blendFactors));
 g.FillPath(pb, path);
 pb.Free;
 path.Free;
 g.Free;
end;
procedure TForm1.TrackBar1Change(Sender: TObject);
begin
 Repaint;
end;
procedure TForm1.TrackBar2Change(Sender: TObject);
begin
 Repaint;
end;
procedure TForm1.TrackBar3Change(Sender: TObject);
begin
 Repaint;
end;
procedure TForm1.TrackBar4Change(Sender: TObject);
begin
 Repaint;
end;
procedure TForm1.TrackBar5Change(Sender: TObject);
begin
 Repaint;
end;
procedure TForm1.TrackBar6Change(Sender: TObject);
begin
 Repaint;
end;
end.

窗體文件:object Form1: TForm1
 Left = 0
 Top = 0
 Caption = 'Form1'
 ClientHeight = 222
 ClientWidth = 242
 Color = clBtnFace
 Font.Charset = DEFAULT_CHARSET
 Font.Color = clWindowText
 Font.Height = -11
 Font.Name = 'Tahoma'
 Font.Style = []
 OldCreateOrder = False
 Position = poDesktopCenter
 OnCreate = FormCreate
 OnPaint = FormPaint
 PixelsPerInch = 96
 TextHeight = 13
 object TrackBar1: TTrackBar
  Left = 13
  Top = 152
  Width = 105
  Height = 23
  ShowSelRange = False
  TabOrder = 0
  OnChange = TrackBar1Change
 end
 object TrackBar2: TTrackBar
  Left = 13
  Top = 174
  Width = 105
  Height = 23
  ShowSelRange = False
  TabOrder = 1
  OnChange = TrackBar2Change
 end
 object TrackBar3: TTrackBar
  Left = 13
  Top = 196
  Width = 105
  Height = 23
  ShowSelRange = False
  TabOrder = 2
  OnChange = TrackBar3Change
 end
 object TrackBar4: TTrackBar
  Left = 125
  Top = 152
  Width = 105
  Height = 23
  ShowSelRange = False
  TabOrder = 3
  OnChange = TrackBar4Change
 end
 object TrackBar5: TTrackBar
  Left = 125
  Top = 174
  Width = 105
  Height = 23
  ShowSelRange = False
  TabOrder = 4
  OnChange = TrackBar5Change
 end
 object TrackBar6: TTrackBar
  Left = 125
  Top = 196
  Width = 105
  Height = 23
  ShowSelRange = False
  TabOrder = 5
  OnChange = TrackBar6Change
 end
end

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