再学 GDI+[26]: TGPPen - 画笔对齐 - SetAlignment

本例效果图:

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代码文件:

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unit Unit1;



interface



uses

  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,

  Dialogs, StdCtrls, ExtCtrls;



type

  TForm1 = class(TForm)

    RadioGroup1: TRadioGroup;

    procedure FormPaint(Sender: TObject);

    procedure FormCreate(Sender: TObject);

    procedure RadioGroup1Click(Sender: TObject);

  end;



var

  Form1: TForm1;



implementation



{$R *.dfm}



uses GDIPOBJ, GDIPAPI;



procedure TForm1.FormCreate(Sender: TObject);

begin

  with RadioGroup1 do

  begin

    Align := alBottom;

    Items.Add('PenAlignmentCenter');

    Items.Add('PenAlignmentInset');

    Columns := 2;

    ItemIndex := 0;

  end;

end;



procedure TForm1.FormPaint(Sender: TObject);

var

  g: TGPGraphics;

  p: TGPPen;

  rect: TRect;

begin

  g := TGPGraphics.Create(Canvas.Handle);

  g.Clear($FFFFFFFF);

  p := TGPPen.Create($FFEE82EE, 20);



  rect := ClientRect;

  InflateRect(rect, -50, -50);

  OffsetRect(rect, 0, -20);



  p.SetAlignment(TPenAlignment(RadioGroup1.ItemIndex));

  g.DrawRectangle(p, MakeRect(rect));



  p.SetColor($FF000000);

  p.SetWidth(1.5);

  g.DrawRectangle(p, MakeRect(rect));



  p.Free;

  g.Free;

end;





procedure TForm1.RadioGroup1Click(Sender: TObject);

begin

  Repaint;

end;



end.


 
   

窗体文件:

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object Form1: TForm1

  Left = 0

  Top = 0

  Caption = 'Form1'

  ClientHeight = 198

  ClientWidth = 277

  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 RadioGroup1: TRadioGroup

    Left = 8

    Top = 152

    Width = 185

    Height = 38

    Caption = 'RadioGroup1'

    TabOrder = 0

    OnClick = RadioGroup1Click

  end

end


 
   

画笔对齐方式:

Delphi	微软	说明
PenAlignmentCenter	Center	指定 Pen 对象以理论的线条为中心。
PenAlignmentInset	Inset	指定 Pen 被定位于理论的线条内。
无定义	Left	指定将 Pen 定位于理论的线条的左侧。
无定义	Outset	指定将 Pen 定位于理论的线条外。
无定义	Right	指定将 Pen 定位于理论的线条的右侧。

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