VCL 中的 Windows API 函数: BeginPath、EndPath

BeginPath         {路径开始}EndPath {路径结束}
StrokePath        {绘制路径}
FillPath          {填充路径}
StrokeAndFillPath {绘制并填充路径}

//在路径中可以使用的图形命令有:
AngleArc
Arc
ArcTo
Chord
CloseFigure
Ellipse
ExtTextOut
LineTo
MoveToEx
Pie
PolyBezier
PolyBezierTo
PolyDraw
Polygon
Polyline
PolylineTo
PolyPolygon
PolyPolyline
Rectangle
RoundRect
TextOut

---

代码文件:

---

 

unit Unit1;interfaceuses  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}procedure TForm1.FormCreate(Sender: TObject);begin  RadioGroup1.Items.CommaText := '绘制路径,填充路径,绘制并填充';  RadioGroup1.ItemIndex := 0;  RadioGroup1.Columns := RadioGroup1.Items.Count;end;procedure TForm1.FormPaint(Sender: TObject);begin  Canvas.Font.Size := 36;  Canvas.Font.Style := [fsBold];  SetBkMode(Canvas.Handle, TRANSPARENT);  BeginPath(Canvas.Handle);  Canvas.Rectangle(10,10,110,110);  Canvas.TextOut(20,30,'Delphi 2007');  EndPath(Canvas.Handle);  Canvas.Brush.Color := clYellow;  Canvas.Pen.Color := clRed;  case RadioGroup1.ItemIndex of    0: StrokePath(Canvas.Handle);    1: FillPath(Canvas.Handle);    2: StrokeAndFillPath(Canvas.Handle);  end;end;procedure TForm1.RadioGroup1Click(Sender: TObject);begin  Repaint;end;end.

窗体设计:

---

object Form1: TForm1  Left = 373  Top = 260  Caption = 'Form1'  ClientHeight = 193  ClientWidth = 321  Color = clBtnFace  Font.Charset = DEFAULT_CHARSET  Font.Color = clWindowText  Font.Height = -11  Font.Name = 'Tahoma'  Font.Style = []  OldCreateOrder = False  Position = poDesigned  OnCreate = FormCreate  OnPaint = FormPaint  PixelsPerInch = 96  TextHeight = 13  object RadioGroup1: TRadioGroup    Left = 28    Top = 131    Width = 265    Height = 49    Caption = 'RadioGroup1'    TabOrder = 0    OnClick = RadioGroup1Click  endend