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 程式師世界 >> 編程語言 >> 更多編程語言 >> Delphi >> 再學 GDI+[73]: 區域(2) - 區域運算

再學 GDI+[73]: 區域(2) - 區域運算

編輯:Delphi

Intersect {交集}
Union   {聯合}
Xor_    {減去交集}
Exclude  {減去}
Complement {不相交}
//GDI+ 的區域能和矩形、路徑、另一個區域三種對象進行運算.
本例效果圖:

再學 GDI+[73]: 區域(2) - 區域運算

  代碼文件:unit Unit1;
interface
uses
 Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
 Dialogs, StdCtrls, ExtCtrls;
type
 TForm1 = class(TForm)
  RadioGroup1: TRadioGroup;
  procedure FormCreate(Sender: TObject);
  procedure FormPaint(Sender: TObject);
  procedure RadioGroup1Click(Sender: TObject);
 end;
var
 Form1: TForm1;
implementation
{$R *.dfm}
uses GDIPOBJ, GDIPAPI;
procedure TForm1.FormCreate(Sender: TObject);
begin
 RadioGroup1.Items.CommaText := '通道,矩形,Intersect,Union,Xor_,Exclude,Complement';
 RadioGroup1.ItemIndex := 0;
end;
procedure TForm1.FormPaint(Sender: TObject);
var
 g: TGPGraphics;
 p: TGPPen;
 path: TGPGraphicsPath;
 b: TGPBrush;
 rgn: TGPRegion;
 rt: TGPRect;
begin
 g := TGPGraphics.Create(Canvas.Handle);
 p := TGPPen.Create(MakeColor(100, 255, 0, 0));
 b := TGPHatchBrush.Create(HatchStyleSmallGrid, aclSilver, aclCornflowerBlue);
 {准備個路徑}
 path := TGPGraphicsPath.Create;
 path.AddEllipse(20, 20, 100, 80);
 {根據路徑建立區域}
 rgn := TGPRegion.Create(path);
 {獲取距形}
// rgn.GetBounds(rt, g);
 path.GetBounds(rt);
 {下移矩形, 將用此矩形與上面的區域進行運算}
 rt.Y := rt.Y + rt.Height div 2;
 case RadioGroup1.ItemIndex of
  1: rgn := TGPRegion.Create(rt);
  2: rgn.Intersect(rt);
  3: rgn.Union(rt);
  4: rgn.Xor_(rt);
  5: rgn.Exclude(rt);
  6: rgn.Complement(rt);
 end;
 g.FillRegion(b, rgn);
 g.DrawPath(p, path);
 g.DrawRectangle(p, rt);
 b.Free;
 rgn.Free;
 p.Free;
 g.Free;
end;
procedure TForm1.RadioGroup1Click(Sender: TObject);
begin
 Repaint;
end;
end.
窗體文件:object Form1: TForm1
 Left = 0
 Top = 0
 Caption = 'Form1'
 ClIEntHeight = 167
 ClIEntWidth = 238
 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 RadioGroup1: TRadioGroup
  Left = 137
  Top = 8
  Width = 91
  Height = 151
  Caption = 'RadioGroup1'
  TabOrder = 0
  OnClick = RadioGroup1Click
 end
end


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