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unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls, ExtCtrls, ToolWin, ComCtrls;
type
TForm1 = class(TForm)
PaintBox1: TPaintBox;
Button1: TButton;
Button2: TButton;
ScrollBar1: TScrollBar;
procedure Button1Click(Sender: TObject);
procedure Button2Click(Sender: TObject);
procedure ScrollBar1Change(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
procedure TForm1.Button1Click(Sender: TObject);
begin
with PaintBox1 do begin
Canvas.Brush.Color := clRed;
Canvas.Brush.Style := bsDiagCross;
Canvas.Ellipse(0, 0, PaintBox1.Width, PaintBox1.Height);
end;
end;
procedure TForm1.Button2Click(Sender: TObject);
var Y: Integer;
begin
{ first call FillRect to paint the surface of the form.
this removes any previously drawn lines (and anything else!)
PaintBox1.Canvas.FillRect(ClientRect);}
PaintBox1.Canvas.MoveTo(0, 0);
PaintBox1.Canvas.LineTo(PaintBox1.Width,PaintBox1.Height);
end;
procedure TForm1.ScrollBar1Change(Sender: TObject);
begin
PaintBox1.Canvas.MoveTo(0,ScrollBar1.Position);
PaintBox1.Canvas.LineTo(256,ScrollBar1.Position);
end;
end.