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.
