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 程式師世界 >> 編程語言 >> 更多編程語言 >> Delphi >> 再學GDI+[63]: 路徑畫刷(3) - SetFocusScales、GetFocusScales

再學GDI+[63]: 路徑畫刷(3) - SetFocusScales、GetFocusScales

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, StdCtrls, CheckLst, ExtCtrls, TeCanvas, ComCtrls;
type
 TForm1 = class(TForm)
  TrackBar1: TTrackBar;
  TrackBar2: TTrackBar;
  procedure FormCreate(Sender: TObject);
  procedure FormDestroy(Sender: TObject);
  procedure FormPaint(Sender: TObject);
  procedure TrackBar1Change(Sender: TObject);
  procedure TrackBar2Change(Sender: TObject);
 end;
var
 Form1: TForm1;
implementation
{$R *.dfm}
uses GDIPOBJ, GDIPAPI;
var
 rect: TGPRect;
 pb: TGPPathGradientBrush;
procedure TForm1.FormCreate(Sender: TObject);
var
 path: TGPGraphicsPath;
 ColorSurround: TGPColor;
 num: Integer;
begin
 rect := MakeRect(10, 10, ClientWidth-40, ClientHeight-40);
 path := TGPGraphicsPath.Create;
 path.AddEllipse(rect);
 pb := TGPPathGradientBrush.Create(path);
 pb.SetCenterColor(aclLime);
 ColorSurround := aclBlack;
 num := 1;
 pb.SetSurroundColors(@ColorSurround, num);
 path.Free;
 DoubleBuffered := True;
 TrackBar1.Max := 100;
 TrackBar2.Max := 100;
end;
procedure TForm1.FormDestroy(Sender: TObject);
begin
 pb.Free;
end;
procedure TForm1.FormPaint(Sender: TObject);
var
 g: TGPGraphics;
 p: TGPPen;
 x,y: Single;
begin
 g := TGPGraphics.Create(Canvas.Handle);
 p := TGPPen.Create(aclRed);
 g.FillEllipse(pb, rect);
 pb.SetCenterPoint(MakePoint(rect.X + rect.Width p 2, rect.Y + rect.Height p 2));
 {SetFocusScales}
 pb.SetFocusScales(TrackBar1.Position / 100, TrackBar2.Position / 100);
 {GetFocusScales}
 pb.GetFocusScales(x, y);
 Text := Format('%f,%f',[x,y]);
 p.Free;
 g.Free;
end;
procedure TForm1.TrackBar1Change(Sender: TObject);
begin
 Repaint;
end;
procedure TForm1.TrackBar2Change(Sender: TObject);
begin
 Repaint;
end;
end.

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