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 div 2);
pt2 := MakePoint(ClientWidth div 2, 0);
pt3 := MakePoint(ClientWidth, ClientHeight div 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.
窗體文件:object Form1: TForm1
Left = 0
Top = 0
Caption = 'Form1'
ClientHeight = 179
ClientWidth = 243
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 CheckBox1: TCheckBox
Left = 44
Top = 145
Width = 97
Height = 17
Caption = 'CheckBox1'
TabOrder = 0
OnClick = CheckBox1Click
end
object CheckBox2: TCheckBox
Left = 132
Top = 145
Width = 97
Height = 17
Caption = 'CheckBox2'
TabOrder = 1
OnClick = CheckBox2Click
end
end
