GDI+ 学习记录(19): 路径 Path

//绘制与填充路径
var
  g: TGPGraphics;
  path: TGPGraphicsPath;
  p: TGPPen;
  sb: TGPSolidBrush;
begin
  g := TGPGraphics.Create(Canvas.Handle);
  p := TGPPen.Create(MakeColor(128,255,0,0),4);
  sb := TGPSolidBrush.Create(MakeColor(128,255,255,0));
  path := TGPGraphicsPath.Create;

  path.StartFigure;
  path.AddLine(MakePoint(11,11), MakePoint(222,111));
  path.AddBezier(MakePoint(11,11), MakePoint(33,111), MakePoint(66,6),MakePoint(111,111));
  path.CloseFigure;

  g.DrawPath(p, path);
  g.FillPath(sb, path);

  p.Free;
  sb.Free;
  path.Free;
  g.Free;
end;


//路径中的拐点结合
var
  g: TGPGraphics;
  p: TGPPen;
  path: TGPGraphicsPath;
  p1,p2,p3: TGPPoint;
begin
  g := TGPGraphics.Create(Canvas.Handle);
  p:= TGPPen.Create(MakeColor(255, 0, 0, 255),8);
  path:= TGPGraphicsPath.Create;

  p1.X := 50;  p1.Y := 200;
  p2.X := 100; p2.Y := 200;
  p3.X := 100; p3.Y := 250;

  path.AddLine(p1, p2);
  path.AddLine(p2, p3);

  p.SetLineJoin(LineJoinBevel); {设置结合样式}
  g.DrawPath(p, path);

  path.Free;
  p.Free;
  g.Free;
end;

路径中的拐点结合样式:

Delphi	微软	说明
LineJoinBevel	Bevel	指定成斜角的联接。这将产生一个斜角。
LineJoinMiter	Miter	指定斜联接。这将产生一个锐角或切除角，具体取决于斜联接的长度是否超过斜联接限制。
LineJoinMiterClipped	MiterClipped	指定斜联接。这将产生一个锐角或斜角，具体取决于斜联接的长度是否超过斜联接限制。
LineJoinRound	Round	指定圆形联接。这将在两条线之间产生平滑的圆弧。