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 := 'CloseFigure';
CheckBox2.Caption := 'CloseAllFigures';
end;
procedure TForm1.FormPaint(Sender: TObject);
var
g: TGPGraphics;
path: TGPGraphicsPath;
p: TGPPen;
b: TGPBrush;
pts1,pts2,pts3: array[0..2] of TGPPoint;
i: Integer;
begin
pts1[0] := MakePoint(0, 30);
pts1[1] := MakePoint(30, 0);
pts1[2] := MakePoint(60, 30);
for i := 0 to Length(pts1) do
begin
pts2[i].X := pts1[i].X + 80;
pts2[i].Y := pts1[i].Y + 20;
pts3[i].X := pts2[i].X + 80;
pts3[i].Y := pts2[i].Y + 20;
end;
g := TGPGraphics.Create(Canvas.Handle);
path := TGPGraphicsPath.Create;
path.StartFigure;
path.AddLines(PGPPoint(@pts1), Length(pts1));
path.StartFigure;
path.AddLines(PGPPoint(@pts2), Length(pts2));
path.StartFigure;
path.AddLines(PGPPoint(@pts3), Length(pts3));
if CheckBox1.Checked then path.CloseFigure;
if CheckBox2.Checked then path.CloseAllFigures;
p := TGPPen.Create(aclRed, 2);
b := TGPSolidBrush.Create(aclYellow);
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 = 139
ClientWidth = 227
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 = 28
Top = 105
Width = 97
Height = 17
Caption = 'CheckBox1'
TabOrder = 0
OnClick = CheckBox1Click
end
object CheckBox2: TCheckBox
Left = 120
Top = 105
Width = 97
Height = 17
Caption = 'CheckBox2'
TabOrder = 1
OnClick = CheckBox2Click
end
end
