WinAPI: BeginPath、EndPath、StrokePath、FillPath、StrokeAndFillPath

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


 
   

本例效果图:

---

代码文件:

---

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}



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

  end

end