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 程式師世界 >> 編程語言 >> 更多編程語言 >> Delphi >> 再學GDI+[26]: TGPPen - 畫筆對齊 - SetAlignment

再學GDI+[26]: TGPPen - 畫筆對齊 - SetAlignment

編輯:Delphi

本例效果圖:

代碼文件: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.

窗體文件: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

畫筆對齊方式:

Delphi 微軟 說明 PenAlignmentCenter Center 指定 Pen 對象以理論的線條為中心。 PenAlignmentInset Inset 指定 Pen 被定位於理論的線條內。 無定義 Left 指定將 Pen 定位於理論的線條的左側。 無定義 Outset 指定將 Pen 定位於理論的線條外。 無定義 Right 指定將 Pen 定位於理論的線條的右側。
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