GDI+ 学习记录(17) 曲线 - Curve

//画曲线
var
  g: TGPGraphics;
  p: TGPPen;
  pts: array[0..4] of TGPPoint;
begin
  g := TGPGraphics.Create(Canvas.Handle);
  p := TGPPen.Create(MakeColor(255,0,0),4);

  pts[0].X := 11;  pts[0].Y := 11;
  pts[1].X := 66;  pts[1].Y := 66;
  pts[2].X := 88;  pts[2].Y := 222;
  pts[3].X := 111; pts[3].Y := 111;
  pts[4].X := 222; pts[4].Y := 88;

  g.DrawCurve(p, PGPPoint(@pts), Length(pts));

  p.Free;
  g.Free;
end;

//指定曲度
var
  g: TGPGraphics;
  p: TGPPen;
  pts: array[0..4] of TGPPoint;
begin
  g := TGPGraphics.Create(Canvas.Handle);
  p := TGPPen.Create(MakeColor(255,0,0),4);

  pts[0].X := 11;  pts[0].Y := 11;
  pts[1].X := 66;  pts[1].Y := 66;
  pts[2].X := 88;  pts[2].Y := 222;
  pts[3].X := 111; pts[3].Y := 111;
  pts[4].X := 222; pts[4].Y := 88;

  g.DrawCurve(p, PGPPoint(@pts), Length(pts), 0.25); //指定曲度为 0.25; 默认是 0.5

  p.Free;
  g.Free;
end;

//绘制曲线的部分
var
  g: TGPGraphics;
  p: TGPPen;
  pts: array[0..4] of TGPPoint;
begin
  g := TGPGraphics.Create(Canvas.Handle);
  g.Clear(aclWhite);
  p := TGPPen.Create(aclRed,4);

  pts[0]:=MakePoint(11,11);
  pts[1]:=MakePoint(66,66);
  pts[2]:=MakePoint(88,152);
  pts[3]:=MakePoint(111,111);
  pts[4]:=MakePoint(252,88);

  g.DrawCurve(p, PGPPoint(@pts), Length(pts), 0, 3, 0);
  {参数 4指定从第几个点开始; 参数 5 指示绘制几段; 参数 6 是曲度为 0 时就成了连续的直线}

  p.Free;
  g.Free;
end;