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再学GDI+[66]: 路径画刷(6) - SetInterpolationColors、GetRecta

时间:2012-05-23 | 栏目:Delphi教程 | 点击:

本例效果图:

代码文件:unit Unit1;
interface
uses
 Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
 Dialogs;
type
 TForm1 = class(TForm)
  procedure FormPaint(Sender: TObject);
 end;
var
 Form1: TForm1;
implementation
{$R *.dfm}
uses GDIPOBJ, GDIPAPI;
procedure TForm1.FormPaint(Sender: TObject);
var
 g : TGPGraphics;
 path: TGPGraphicsPath;
 pb: TGPPathGradientBrush;
 rt: TGPRect;
const
 pts: array[0..2] of TGPPoint = ((X:90; Y:10), (X:10; Y:160), (X:160; Y:160));
 colors: array[0..2] of TGPColor = (aclGreen, aclAqua, aclBlue);
 pos: array[0..2] of Single = (0.0, 0.25, 1.0); {颜色位置需要 >=0、<=1, 是百 分比}
begin
 {三角}
 g := TGPGraphics.Create(Canvas.Handle);
 path := TGPGraphicsPath.Create;
 path.AddPolygon(PGPPoint(@pts), Length(pts));
 pb:= TGPPathGradientBrush.Create(path);
 pb.SetInterpolationColors(@colors, @pos, Length(colors)); {SetInterpolationColors}
 g.FillPath(pb, path);
 {矩形}
 pb.GetRectangle(rt); {GetRectangle}
 path.Reset;
 path.AddRectangle(rt);
 pb.Free;
 pb:= TGPPathGradientBrush.Create(path);
 pb.SetInterpolationColors(@colors, @pos, Length(colors));
 g.TranslateTransform(160, 0);
 g.FillPath(pb, path);
 {椭圆}
 path.Reset;
 path.AddEllipse(rt);
 pb.Free;
 pb:= TGPPathGradientBrush.Create(path);
 pb.SetInterpolationColors(@colors, @pos, Length(colors));
 g.TranslateTransform(160, 0);
 g.FillPath(pb, path);
 pb.Free;
 path.Free;
 g.Free;
end;
end.

窗体文件:object Form1: TForm1
 Left = 0
 Top = 0
 Caption = 'Form1'
 ClientHeight = 164
 ClientWidth = 491
 Color = clBtnFace
 Font.Charset = DEFAULT_CHARSET
 Font.Color = clWindowText
 Font.Height = -11
 Font.Name = 'Tahoma'
 Font.Style = []
 OldCreateOrder = False
 Position = poDesktopCenter
 OnPaint = FormPaint
 PixelsPerInch = 96
 TextHeight = 13
end

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