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再学GDI+[77]: 区域(6) - GetRegionScans - 获取区域中的所有矩

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, StdCtrls;
type
 TForm1 = class(TForm)
  procedure FormPaint(Sender: TObject);
  procedure FormClick(Sender: TObject);
 end;
var
 Form1: TForm1;
implementation
{$R *.dfm}
uses GDIPOBJ, GDIPAPI;
procedure TForm1.FormPaint(Sender: TObject);
var
 g: TGPGraphics;
 b: TGPSolidBrush;
 path: TGPGraphicsPath;
 rgn: TGPRegion;
 Matrix: TGPMatrix;
 RectCount: Integer;
 rts: array of TGPRect;
 i: Integer;
begin
 g := TGPGraphics.Create(Canvas.Handle);
 b := TGPSolidBrush.Create(MakeColor(50, 0, 0, 255));
 path := TGPGraphicsPath.Create;
 path.AddEllipse(MakeRect(20, 10, ClientWidth-40, ClientHeight-20));
 rgn := TGPRegion.Create(path);
 Matrix := TGPMatrix.Create; {它在本例中只是个摆设, 因为参选需要}
 RectCount := rgn.GetRegionScansCount(Matrix);
 SetLength(rts, RectCount);
 rgn.GetRegionScans(Matrix, PGPRect(rts), RectCount);
 Randomize;
 for i := 0 to RectCount - 1 do
 begin
  b.SetColor(ColorRefToARGB(Random($FFFFFF)));
  g.FillRectangle(b, rts[i]);
 end;
 Matrix.Free;
 rgn.Free;
 path.Free;
 b.Free;
 g.Free;
end;
procedure TForm1.FormClick(Sender: TObject);
begin
 Repaint;
end;
end.

窗体文件:object Form1: TForm1
 Left = 0
 Top = 0
 Caption = 'Form1'
 ClientHeight = 217
 ClientWidth = 219
 Color = clBtnFace
 Font.Charset = DEFAULT_CHARSET
 Font.Color = clWindowText
 Font.Height = -11
 Font.Name = 'Tahoma'
 Font.Style = []
 OldCreateOrder = False
 Position = poDesktopCenter
 OnClick = FormClick
 OnPaint = FormPaint
 PixelsPerInch = 96
 TextHeight = 13
end

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