unit Unit1;interfaceuses  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,  Dialogs, StdCtrls;type  TForm1 = class(TForm)    Button1: TButton;    Button2: TButton;    procedure Button1Click(Sender: TObject);    procedure Button2Click(Sender: TObject);  end;var  Form1: TForm1;implementation{$R *.dfm}{PolyBezier 至少需要四个点做参数; 不改变画笔的当前位置}procedure TForm1.Button1Click(Sender: TObject);var  pts: array[0..3] of TPoint;begin  Canvas.Pen.Width := 2;  Canvas.Pen.Color := clRed;  pts[0].X := 10; pts[0].Y := 10;  {起点}  pts[1].X := 60; pts[1].Y := 10;  {控制点1}  pts[2].X := 10; pts[2].Y := 100; {控制点2}  pts[3].X := 60; pts[3].Y := 100; {终点}  Canvas.PolyBezier(pts);  Canvas.Pen.Width := 1;  Canvas.Pen.Color := clWhite;  Canvas.LineTo(ClientWidth, ClientHeight);end;{PolyBezierTo 最少只需要需要三个点, 它把当前位置当作第一点; 会改变画笔的当前位置}procedure TForm1.Button2Click(Sender: TObject);var  pts: array[1..3] of TPoint; {从 1 开始的, 就 3 个元素}begin  Canvas.Pen.Width := 2;  Canvas.Pen.Color := clRed;  Canvas.MoveTo(10 + 82, 10);           {起点}  //pts[0].X := 10; pts[0].Y := 10;  pts[1].X := 60 + 82; pts[1].Y := 10;  {控制点1}  pts[2].X := 10 + 82; pts[2].Y := 100; {控制点2}  pts[3].X := 60 + 82; pts[3].Y := 100; {终点}  Canvas.PolyBezierTo(pts);  Canvas.Pen.Width := 1;  Canvas.Pen.Color := clBlue;  Canvas.LineTo(ClientWidth, ClientHeight);end;end.         //效果图:

//绘制多条贝塞尔线时, 每条线的终点也是下条线的起点.unit Unit1;interfaceuses  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,  Dialogs, StdCtrls;type  TForm1 = class(TForm)    Button1: TButton;    Button2: TButton;    procedure Button1Click(Sender: TObject);    procedure Button2Click(Sender: TObject);  end;var  Form1: TForm1;implementation{$R *.dfm}{PolyBezier 绘制多条线时, 需要 3*x + 1 个点}procedure TForm1.Button1Click(Sender: TObject);var  pts: array[0..6] of TPoint;begin  Canvas.Pen.Width := 2;  Canvas.Pen.Color := clRed;  pts[0].X := 10; pts[0].Y := 10;  pts[1].X := 60; pts[1].Y := 10;  pts[2].X := 10; pts[2].Y := 100;  pts[3].X := 40; pts[3].Y := 100;  pts[4].X := 100; pts[4].Y := 10;  pts[5].X := 55; pts[5].Y := 99;  pts[6].X := 70; pts[6].Y := 10;  Canvas.PolyBezier(pts);end;{PolyBezierTo 绘制多条线时, 需要 3*x 个点}procedure TForm1.Button2Click(Sender: TObject);var  pts: array[1..6] of TPoint;begin  Canvas.Pen.Width := 2;  Canvas.Pen.Color := clRed;  Canvas.MoveTo(10 + 82, 10);  //pts[0].X := 10; pts[0].Y := 10;  pts[1].X := 60 + 82; pts[1].Y := 10;  pts[2].X := 10 + 82; pts[2].Y := 100;  pts[3].X := 40 + 82; pts[3].Y := 100;  pts[4].X := 100 + 82; pts[4].Y := 10;  pts[5].X := 55 + 82; pts[5].Y := 99;  pts[6].X := 70 + 82; pts[6].Y := 10;  Canvas.PolyBezierTo(pts);end;end.         //效果图: