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 程式師世界 >> 編程語言 >> 更多編程語言 >> Delphi >> 路徑畫刷

路徑畫刷

編輯:Delphi

RotateTransform、ScaleTransform 等變換

RotateTransform  {旋轉}
ScaleTransform   {縮放}
TranslateTransform {平移}
SetTransform    {綜合的矩陣變換}
ResetTransform   {取消變換}

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;
  procedure FormCreate(Sender: TObject);
  procedure FormPaint(Sender: TObject);
  procedure TrackBar1Change(Sender: TObject);
  procedure TrackBar2Change(Sender: TObject);
 end;
var
 Form1: TForm1;
implementation
{$R *.dfm}
uses GDIPOBJ, GDIPAPI;
procedure TForm1.FormCreate(Sender: TObject);
begin
 TrackBar1.Min := -50;
 TrackBar1.Max := 50;
 TrackBar1.Position := 0;
 TrackBar2.Min := 1;
 TrackBar2.Max := 10;
 TrackBar2.Position := 10;
end;
procedure TForm1.FormPaint(Sender: TObject);
const
 colors: array[0..3] of TGPColor = (aclRed, aclYellow, aclGreen, aclBlue);
var
 g: TGPGraphics;
 p: TGPPen;
 path: TGPGraphicsPath;
 pb: TGPPathGradIEntBrush;
 num: Integer;
begin
 g := TGPGraphics.Create(Canvas.Handle);
 p := TGPPen.Create(aclRed);
 path := TGPGraphicsPath.Create;
 path.AddRectangle(MakeRect(50, 20, 120, 100));
 pb := TGPPathGradIEntBrush.Create(path);
 num := Length(colors);
 pb.SetSurroundColors(@colors, num);
 //pb.ResetTransform;
 pb.RotateTransform(TrackBar1.Position);
 pb.ScaleTransform(TrackBar2.Position / 10, TrackBar2.Position / 10);
 g.FillPath(pb, path);
 g.DrawPath(p, path);
 pb.Free;
 path.Free;
 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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