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再学GDI+[64]: 路径画刷(4) - 还是 SetCenterColor、SetSurround

时间:2012-05-23 | 栏目:Delphi教程 | 点击:

在本例中没有指定 CenterColor, 将默认白色;

SurroundColors 原来是对应路径中的点(但按下面的做法在椭圆里不灵).

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
{$R *.dfm}
uses GDIPOBJ, GDIPAPI;
procedure TForm1.FormPaint(Sender: TObject);
const
 ColorArr: array[0..3] of TGPColor = ($FFFF0000, $FF00FF00, $FF0000FF, $FFFFFF00);
var
 rt: TRect;
 pts: array of TGPPoint;
 g: TGPGraphics;
 path1, path2: TGPGraphicsPath;
 pb1,pb2: TGPPathGradientBrush;
 num: Integer;
begin
 rt := Bounds(10, 10, 150, 150);
 g := TGPGraphics.Create(Canvas.Handle);
 {矩形路径}
 path1 := TGPGraphicsPath.Create;
 path1.AddRectangle(MakeRect(rt));
 pb1 := TGPPathGradientBrush.Create(path1);
 num := 4;
 pb1.SetSurroundColors(PARGB(@ColorArr), num);
 g.FillPath(pb1, path1);
 {三角形路径}
 OffsetRect(rt, 160, 0);
 SetLength(pts, 3);
 pts[0] := MakePoint(rt.Left + (rt.Right-rt.Left) p 2, rt.Top);
 pts[1] := MakePoint(rt.Left, rt.Bottom);
 pts[2] := TGPPoint(rt.BottomRight);
 path2 := TGPGraphicsPath.Create;
 path2.AddPolygon(PGPPoint(pts), Length(pts));
 pb2 := TGPPathGradientBrush.Create(path2);
 num := 3;
 pb2.SetSurroundColors(PARGB(@ColorArr), num);
 g.FillPath(pb2, path2);
 pb1.Free;
 pb2.Free;
 path1.Free;
 path2.Free;
 g.Free;
end;
end.

窗体文件:object Form1: TForm1
 Left = 0
 Top = 0
 Caption = 'Form1'
 ClientHeight = 172
 ClientWidth = 327
 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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