Delphi的繪圖功能[7] - PolyBezier、PolyBezierTo

unit Unit1;
interface
uses
　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 至少需要四個點做參數; 不改變畫筆的當前位置}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;　{起點}
　pts[1].X := 60; pts[1].Y := 10;　{控制點1}
　pts[2].X := 10; pts[2].Y := 100; {控制點2}
　pts[3].X := 60; pts[3].Y := 100; {終點}
　Canvas.PolyBezier(pts);
　Canvas.Pen.Width := 1;
　Canvas.Pen.Color := clWhite;
　Canvas.LineTo(ClientWidth, ClientHeight);
end;{PolyBezierTo 最少只需要需要三個點, 它把當前位置當作第一點; 會改變畫筆的當前位 置}procedure TForm1.Button2Click(Sender: TObject);
var
　pts: array[1..3] of TPoint; {從 1 開始的, 就 3 個元素}
begin
　Canvas.Pen.Width := 2;
　Canvas.Pen.Color := clRed;
　Canvas.MoveTo(10 + 82, 10);　　　　　 {起點}
　//pts[0].X := 10; pts[0].Y := 10;
　pts[1].X := 60 + 82; pts[1].Y := 10;　{控制點1}
　pts[2].X := 10 + 82; pts[2].Y := 100; {控制點2}
　pts[3].X := 60 + 82; pts[3].Y := 100; {終點}
　Canvas.PolyBezierTo(pts);
　Canvas.Pen.Width := 1;
　Canvas.Pen.Color := clBlue;
　Canvas.LineTo(ClientWidth, ClientHeight);
end;
end.

//效果圖:

//繪制多條貝塞爾線時, 每條線的終點也是下條線的起點.unit Unit1;
interface
uses
　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 繪制多條線時, 需要 3*x + 1 個點}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 繪制多條線時, 需要 3*x 個點}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.

//效果圖: