本例效果圖:
代碼文件:
unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, DIB, StdCtrls;
type
TForm1 = class(TForm)
DXPaintBox1: TDXPaintBox;
procedure FormCreate(Sender: TObject);
procedure FormDestroy(Sender: TObject);
procedure DXPaintBox1MouseMove(Sender: TObject; Shift: TShiftState; X,
Y: Integer);
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
var
dib: TDIB;
procedure TForm1.DXPaintBox1MouseMove(Sender: TObject; Shift: TShiftState; X,
Y: Integer);
var
a: TLightArray;
begin
DXPaintBox1.DIB.Assign(dib);
SetLength(a, 1);
a[0].X := X;
a[0].Y := Y;
a[0].Size1 := 4;
a[0].Size2 := 4;
a[0].Color := clWhite;
DXPaintBox1.DIB.InitLight(1, 1);
DXPaintBox1.DIB.DrawLights(a, clBlack);
DXPaintBox1.Repaint;
end;
procedure TForm1.FormCreate(Sender: TObject);
const
ImgPath1 = 'C:\Temp\DX.jpg';
begin
dib := TDIB.Create;
dib.LoadFromFile(ImgPath1);
DXPaintBox1.DIB.Assign(dib);
DXPaintBox1.Width := dib.Width;
DXPaintBox1.Height := dib.Height;
DXPaintBox1.Repaint;
end;
procedure TForm1.FormDestroy(Sender: TObject);
begin
dib.Free;
end;
end.
窗體文件:
object Form1: TForm1
Left = 0
Top = 0
Caption = 'Form1'
ClientHeight = 142
ClientWidth = 177
Color = clBtnFace
Font.Charset = DEFAULT_CHARSET
Font.Color = clWindowText
Font.Height = -11
Font.Name = 'Tahoma'
Font.Style = []
OldCreateOrder = False
OnCreate = FormCreate
OnDestroy = FormDestroy
PixelsPerInch = 96
TextHeight = 13
object DXPaintBox1: TDXPaintBox
Left = 8
Top = 8
Width = 129
Height = 126
AutoStretch = False
Center = False
KeepAspect = False
Stretch = False
ViewWidth = 0
ViewHeight = 0
OnMouseMove = DXPaintBox1MouseMove
end
end
