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;
procedure FormCreate(Sender: TObject);
procedure FormPaint(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);
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.FormPaint(Sender: TObject);
var
g: TGPGraphics;
img: TGPImage;
tb: TGPTextureBrush;
matrix: TGPMatrix;
m11, m12, m21, m22, dx, dy: Single;
begin
g := TGPGraphics.Create(Canvas.Handle);
img := TGPImage.Create('c:\temp\small.png');
tb := TGPTextureBrush.Create(img);
m11 := TrackBar1.Position / 10;
m12 := TrackBar2.Position / 10;
m21 := TrackBar3.Position / 10;
m22 := TrackBar4.Position / 10;
dx := TrackBar5.Position * 10;
dy := TrackBar6.Position * 10;
matrix := TGPMatrix.Create(m11, m12, m21, m22, dx, dy);
tb.SetTransform(matrix);
g.FillRectangle(tb, 0, 0, ClientWidth - Panel1.Width, ClientHeight);
matrix.Free;
img.Free;
tb.Free;
g.Free;
end;
procedure TForm1.TrackBar1Change(Sender: TObject);
begin
Repaint;
end;
procedure TForm1.TrackBar2Change(Sender: TObject);
begin
Repaint;
end;
procedure TForm1.TrackBar3Change(Sender: TObject);
begin
Repaint;
end;
procedure TForm1.TrackBar4Change(Sender: TObject);
begin
Repaint;
end;
procedure TForm1.TrackBar5Change(Sender: TObject);
begin
Repaint;
end;
procedure TForm1.TrackBar6Change(Sender: TObject);
begin
Repaint;
end;
end.
窗體文件:object Form1: TForm1
Left = 0
Top = 0
Caption = 'Form1'
ClientHeight = 170
ClientWidth = 324
Color = clBtnFace
Font.Charset = DEFAULT_CHARSET
Font.Color = clWindowText
Font.Height = -11
Font.Name = 'Tahoma'
Font.Style = []
OldCreateOrder = False
Position = poDesktopCenter
OnCreate = FormCreate
OnPaint = FormPaint
PixelsPerInch = 96
TextHeight = 13
object Panel1: TPanel
Left = 225
Top = 0
Width = 99
Height = 170
Align = alRight
TabOrder = 0
ExplicitLeft = 288
ExplicitHeight = 213
object Button1: TButton
Left = 14
Top = 8
Width = 75
Height = 25
Caption = #21021#22987#21270
TabOrder = 0
end
object TrackBar1: TTrackBar
Left = 0
Top = 34
Width = 100
Height = 20
ShowSelRange = False
TabOrder = 1
OnChange = TrackBar1Change
end
object TrackBar2: TTrackBar
Left = 0
Top = 56
Width = 100
Height = 20
ShowSelRange = False
TabOrder = 2
OnChange = TrackBar2Change
end
object TrackBar3: TTrackBar
Left = 0
Top = 78
Width = 100
Height = 20
ShowSelRange = False
TabOrder = 3
OnChange = TrackBar3Change
end
object TrackBar4: TTrackBar
Left = 0
Top = 100
Width = 100
Height = 20
ShowSelRange = False
TabOrder = 4
OnChange = TrackBar4Change
end
object TrackBar5: TTrackBar
Left = 0
Top = 122
Width = 100
Height = 20
ShowSelRange = False
TabOrder = 5
OnChange = TrackBar5Change
end
object TrackBar6: TTrackBar
Left = 0
Top = 144
Width = 100
Height = 20
ShowSelRange = False
TabOrder = 6
OnChange = TrackBar6Change
end
end
end
