LineJoin 測試效果圖:
LineJoin 測試代碼:
uses GdiPlus;
procedure TForm1.FormPaint(Sender: TObject);
const
Pts: array[0 ..2 ] of TGPPoint = ((X:90 ;Y:80), (X:240;Y:30), (X:240;Y:80));
var
Graphics: IGPGraphics;
Pen: IGPPen;
begin
Graphics := TGPGraphics.Create(Handle);
Pen := TGPPen.Create(TGPColor.Red, 28);
Pen.LineJoin := LineJoinMiter; //默認值
Graphics.DrawPolygon(Pen, Pts);
Graphics.TranslateTransform(0, 80);
Pen.LineJoin := LineJoinBevel;
Graphics.DrawPolygon(Pen, Pts);
Graphics.TranslateTransform(0, 80);
Pen.LineJoin := LineJoinRound;
Graphics.DrawPolygon(Pen, Pts);
end;
MiterLimit 測試效果圖:
MiterLimit 測試代碼:
unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, ComCtrls;
type
TForm1 = class(TForm)
TrackBar1: TTrackBar;
procedure FormPaint(Sender: TObject);
procedure TrackBar1Change(Sender: TObject);
procedure FormCreate(Sender: TObject);
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
uses GdiPlus;
procedure TForm1.FormCreate(Sender: TObject);
begin
TrackBar1.ShowSelRange := False;
TrackBar1.Height := 23;
TrackBar1.Min := 0;
TrackBar1.Max := 100;
TrackBar1.Position := TrackBar1.Max;
end;
procedure TForm1.FormPaint(Sender: TObject);
const
PtArr: array[0..2] of TGPPoint = ((X:90;Y:80), (X:240;Y:30), (X:240;Y:80));
var
Graphics: IGPGraphics;
Pen: IGPPen;
begin
Graphics := TGPGraphics.Create(Canvas.Handle);
Pen := TGPPen.Create($FF2E8B57, 28);
Pen.MiterLimit := TrackBar1.Position / 10;
Graphics.DrawPolygon(Pen, PtArr);
end;
procedure TForm1.TrackBar1Change(Sender: TObject);
begin
Repaint;
end;
end.
MiterLimit 測試窗體:
object Form1: TForm1
Left = 0
Top = 0
Caption = 'Form1'
ClIEntHeight = 138
ClIEntWidth = 266
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 TrackBar1: TTrackBar
Left = 2
Top = 112
Width = 261
Height = 45
TabOrder = 0
OnChange = TrackBar1Change
end
end