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 程式師世界 >> 編程語言 >> 更多編程語言 >> Delphi >> 再學 GDI+[71]: 路徑畫刷(11) - RotateTransform、ScaleTransform 等變換

再學 GDI+[71]: 路徑畫刷(11) - RotateTransform、ScaleTransform 等變換

編輯:Delphi

RotateTransform  {旋轉}
ScaleTransform   {縮放}
TranslateTransform {平移}
SetTransform    {綜合的矩陣變換}
ResetTransform   {取消變換}
本例效果圖:

再學 GDI+[71]: 路徑畫刷(11) - RotateTransform、ScaleTransform 等變換

  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.
窗體文件:object Form1: TForm1
 Left = 0
 Top = 0
 Caption = 'Form1'
 ClIEntHeight = 165
 ClIEntWidth = 222
 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 TrackBar1: TTrackBar
  Left = 13
  Top = 136
  Width = 100
  Height = 23
  ShowSelRange = False
  TabOrder = 0
  OnChange = TrackBar1Change
 end
 object TrackBar2: TTrackBar
  Left = 110
  Top = 134
  Width = 100
  Height = 23
  ShowSelRange = False
  TabOrder = 1
  OnChange = TrackBar2Change
 end
end


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