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 程式師世界 >> 編程語言 >> 更多編程語言 >> Delphi >> 再學GDI+[54]: 路徑 - Transform

再學GDI+[54]: 路徑 - Transform

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, ComCtrls, StdCtrls, ExtCtrls;
type
 TForm1 = class(TForm)
  Panel1: TPanel;
  Button1: TButton;
  TrackBar1: TTrackBar;
  TrackBar2: TTrackBar;
  TrackBar3: TTrackBar;
  TrackBar4: TTrackBar;
  TrackBar5: TTrackBar;
  TrackBar6: TTrackBar;
  PaintBox1: TPaintBox;
  procedure FormCreate(Sender: TObject);
  procedure TrackBar1Change(Sender: TObject);
  procedure TrackBar2Change(Sender: TObject);
  procedure TrackBar3Change(Sender: TObject);
  procedure TrackBar4Change(Sender: TObject);
  procedure TrackBar5Change(Sender: TObject);
  procedure TrackBar6Change(Sender: TObject);
  procedure PaintBox1Paint(Sender: TObject);
 end;
var
 Form1: TForm1;
implementation
{$R *.dfm}
uses GDIPOBJ, GDIPAPI;
procedure TForm1.FormCreate(Sender: TObject);
const
 n = 40;
begin
 TrackBar1.Min := -n;
 TrackBar1.Max := n;
 TrackBar2.Min := -n;
 TrackBar2.Max := n;
 TrackBar3.Min := -n;
 TrackBar3.Max := n;
 TrackBar4.Min := -n;
 TrackBar4.Max := n;
 TrackBar5.Min := -n;
 TrackBar5.Max := n;
 TrackBar6.Min := -n;
 TrackBar6.Max := n;
 TrackBar1.Position := 10;
 TrackBar2.Position := 0;
 TrackBar3.Position := 0;
 TrackBar4.Position := 10;
 TrackBar5.Position := 0;
 TrackBar6.Position := 0;
 Button1.OnClick := FormCreate;
end;
procedure TForm1.PaintBox1Paint(Sender: TObject);
var
 g: TGPGraphics;
 p: TGPPen;
 b: TGPBrush;
 path: TGPGraphicsPath;
 matrix: TGPMatrix;
 fontFamily: TGPFontFamily;
 StringFormat: TGPStringFormat;
 rect: TGPRect;
begin
 rect := MakeRect(20, 20, 180, 120);
 g := TGPGraphics.Create(PaintBox1.Canvas.Handle);
 p := TGPPen.Create(aclYellowGreen, 1);
 b := TGPHatchBrush.Create(HatchStyleSmallGrid, aclSilver, aclYellowGreen);
 fontFamily := TGPFontFamily.Create('Arial Black');
 StringFormat := TGPStringFormat.Create;
 StringFormat.SetAlignment(StringAlignmentCenter);
 StringFormat.SetLineAlignment(StringAlignmentCenter);
 path := TGPGraphicsPath.Create;
 path.AddRectangle(rect);
 path.AddEllipse(rect);
 path.AddString('ABC', -1, fontFamily, FontStyleRegular, 60, rect, StringFormat);
 matrix := TGPMatrix.Create;
 matrix.SetElements(TrackBar1.Position / 10,
           TrackBar2.Position / 10,
           TrackBar3.Position / 10,
           TrackBar4.Position / 10,
           TrackBar5.Position * 10,
           TrackBar6.Position * 10);
 path.Transform(matrix);
 g.FillPath(b, path);
 g.DrawPath(p, path);
 path.Free;
 StringFormat.Free;
 fontFamily.Free;
 b.Free;
 p.Free;
 g.Free;
end;
procedure TForm1.TrackBar1Change(Sender: TObject);
begin
 PaintBox1.Repaint;
end;
procedure TForm1.TrackBar2Change(Sender: TObject);
begin
 PaintBox1.Repaint;
end;
procedure TForm1.TrackBar3Change(Sender: TObject);
begin
 PaintBox1.Repaint;
end;
procedure TForm1.TrackBar4Change(Sender: TObject);
begin
 PaintBox1.Repaint;
end;
procedure TForm1.TrackBar5Change(Sender: TObject);
begin
 PaintBox1.Repaint;
end;
procedure TForm1.TrackBar6Change(Sender: TObject);
begin
 PaintBox1.Repaint;
end;
end.

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