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 程式師世界 >> 編程語言 >> 更多編程語言 >> Delphi >> 再學 GDI+[31]: TGPPen - 設置端點連接方式 - SetLineJoin

再學 GDI+[31]: TGPPen - 設置端點連接方式 - SetLineJoin

編輯:Delphi

本例效果圖:

再學 GDI+[31]: TGPPen - 設置端點連接方式 - SetLineJoin

  代碼文件:unit Unit1;
interface
uses
 Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
 Dialogs, StdCtrls;
type
 TForm1 = class(TForm)
  ListBox1: TListBox;
  procedure FormCreate(Sender: TObject);
  procedure FormPaint(Sender: TObject);
  procedure ListBox1Click(Sender: TObject);
 end;
var
 Form1: TForm1;
implementation
{$R *.dfm}
uses GDIPOBJ, GDIPAPI, TypInfo;
procedure TForm1.FormCreate(Sender: TObject);
var
 i: Integer;
begin
 for i := 0 to 3 do
  ListBox1.Items.Add(GetEnumName(TypeInfo(TLineJoin),i));
 ListBox1.ItemIndex := 0;
end;
procedure TForm1.FormPaint(Sender: TObject);
const
 PtArr: array[0..2] of TGPPoint = ((X:50;Y:150), (X:240;Y:30), (X:240;Y:150));
var
 g: TGPGraphics;
 p: TGPPen;
begin
 g := TGPGraphics.Create(Canvas.Handle);
 p := TGPPen.Create(aclBlueViolet, 28);
 p.SetLineJoin(TLineJoin(ListBox1.ItemIndex));
 g.DrawPolygon(p, PGPPoint(@PtArr), Length(PtArr));
 p.Free;
 g.Free;
end;
procedure TForm1.ListBox1Click(Sender: TObject);
begin
 Repaint;
end;
end.
窗體文件:object Form1: TForm1
 Left = 0
 Top = 0
 Caption = 'Form1'
 ClIEntHeight = 177
 ClIEntWidth = 382
 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 ListBox1: TListBox
  Left = 277
  Top = 0
  Width = 105
  Height = 177
  Align = alRight
  ItemHeight = 13
  TabOrder = 0
  OnClick = ListBox1Click
  ExplicitHeight = 173
 end
end
端點連接方式枚舉:LineJoin = (
 LineJoinMiter,
 LineJoinBevel,
 LineJoinRound,
 LineJoinMiterClipped
);
TLineJoin = LineJoin;


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