本例效果圖:
代碼文件:unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls;
type
TForm1 = class(TForm)
CheckBox1: TCheckBox;
CheckBox2: TCheckBox;
procedure FormCreate(Sender: TObject);
procedure FormPaint(Sender: TObject);
procedure CheckBox1Click(Sender: TObject);
procedure CheckBox2Click(Sender: TObject);
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
uses GDIPOBJ, GDIPAPI;
procedure TForm1.FormCreate(Sender: TObject);
begin
CheckBox1.Caption := '閉合路徑';
CheckBox2.Caption := '填充路徑';
end;
procedure TForm1.FormPaint(Sender: TObject);
var
g: TGPGraphics;
path: TGPGraphicsPath;
p: TGPPen;
b: TGPBrush;
pt1,pt2,pt3: TGPPoint;
begin
pt1 := MakePoint(0, ClientHeight p 2);
pt2 := MakePoint(ClientWidth p 2, 0);
pt3 := MakePoint(ClientWidth, ClientHeight p 2);
g := TGPGraphics.Create(Canvas.Handle);
path := TGPGraphicsPath.Create;
path.AddLine(pt1, pt2);
path.AddLine(pt2, pt3);
if CheckBox1.Checked then path.CloseFigure;
p := TGPPen.Create(aclRed, 2);
b := TGPSolidBrush.Create(aclYellow);
if CheckBox2.Checked then g.FillPath(b, path);
g.DrawPath(p, path);
b.Free;
p.Free;
path.Free;
g.Free;
end;
procedure TForm1.CheckBox1Click(Sender: TObject);
begin
Repaint;
end;
procedure TForm1.CheckBox2Click(Sender: TObject);
begin
Repaint;
end;
end.
