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 程式師世界 >> 編程語言 >> 更多編程語言 >> Delphi >> Delphi 的繪圖功能[3] - 矩形類圖形

Delphi 的繪圖功能[3] - 矩形類圖形

編輯:Delphi

unit Unit1;
interface
uses
 Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
 Dialogs, StdCtrls;
type
 TForm1 = class(TForm)
  Button1: TButton;
  Button2: TButton;
  Button3: TButton;
  Button4: TButton;
  Button5: TButton;
  procedure FormCreate(Sender: TObject);
  procedure Button1Click(Sender: TObject);
  procedure Button2Click(Sender: TObject);
  procedure Button3Click(Sender: TObject);
  procedure Button4Click(Sender: TObject);
  procedure Button5Click(Sender: TObject);
 end;
var
 Form1: TForm1;
implementation
{$R *.dfm}
var
 btn: TButton;
const
 y1 = 10;
 y2 = 80;
{先設置畫筆畫刷}procedure TForm1.FormCreate(Sender: TObject);
begin
 Canvas.Pen.Width := 4;
 Canvas.Pen.Color := clRed;
 Canvas.Brush.Color := clWhite;
end;
{給出左上角和右下角的坐標就可以繪制矩形}procedure TForm1.Button1Click(Sender: TObject);
begin
 btn := TButton(Sender);
 Canvas.Rectangle(btn.Left, y1, btn.Left+btn.Width, y2);
end;
{給出一個矩形結構做參數也可以繪制矩形}procedure TForm1.Button2Click(Sender: TObject);
var
 R: TRect; {定義一個矩形結構}
begin
 btn := TButton(Sender);
 R := Rect(btn.Left, y1, btn.Left+btn.Width, y2);
 Canvas.Rectangle(R);
end;
{繪制圓角矩形; 最後兩個參數是設置圓角的}procedure TForm1.Button3Click(Sender: TObject);
begin
 btn := TButton(Sender);
 Canvas.RoundRect(btn.Left, y1, btn.Left+btn.Width, y2, 20,20);
end;
{繪制焦點矩形; 它不受畫筆的影響; 它的顏色是和畫刷的顏色進行某種運算得來的}procedure TForm1.Button4Click(Sender: TObject);
var
 R: TRect;
begin
 btn := TButton(Sender);
 R := Rect(btn.Left, y1, btn.Left+btn.Width, y2);
 Canvas.DrawFocusRect(R);
end;
{矩形描邊, 用的不是畫筆是畫刷}procedure TForm1.Button5Click(Sender: TObject);
var
 R: TRect;
begin
 btn := TButton(Sender);
 R := Rect(btn.Left, y1, btn.Left+btn.Width, y2);
 Canvas.FrameRect(R);
end;
end.
//效果圖:

Delphi 的繪圖功能[3] - 矩形類圖形


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