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unit Unit1; interface uses Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, Dialogs, ToolWin, ComCtrls, ExtCtrls; type TForm1 = class(TForm) Image1: TImage; procedure FormCreate(Sender: TObject); procedure FormMouseDown(Sender: TObject; Button: TMouseButton; Shift: TShiftState; X, Y: Integer); procedure FormMouseUp(Sender: TObject; Button: TMouseButton; Shift: TShiftState; X, Y: Integer); procedure FormMouseMove(Sender: TObject; Shift: TShiftState; X, Y: Integer); private { Private declarations } StartX: integer; StartY: integer; EndX: integer; EndY: integer; isMousePressed: boolean; public { Public declarations } end; var Form1: TForm1; implementation {$R *.dfm} procedure TForm1.FormCreate(Sender: TObject); begin isMousePressed:=false; Image1.Picture.Bitmap:=TBitmap.create(); Image1.Picture.Bitmap.Width:=Image1.Width; Image1.Picture.Bitmap.Height:=Image1.Height end; procedure TForm1.FormMouseDown(Sender: TObject; Button: TMouseButton; Shift: TShiftState; X, Y: Integer); begin StartX:=X; StartY:=Y; EndX:=StartX; EndY:=StartY; isMousePressed:=true end; procedure TForm1.FormMouseUp(Sender: TObject; Button: TMouseButton; Shift: TShiftState; X, Y: Integer); begin isMousePressed:=false; Image1.Picture.Bitmap.Canvas.Pen.Mode:=pmNOT; Image1.Picture.Bitmap.Canvas.moveTo(StartX, StartY); Image1.Picture.Bitmap.Canvas.lineTo(EndX, EndY); Image1.Picture.Bitmap.Canvas.Pen.Mode:=pmCopy; EndX:=X; EndY:=Y; Image1.Picture.Bitmap.Canvas.moveTo(StartX, StartY); Image1.Picture.Bitmap.Canvas.lineTo(EndX, EndY) end; procedure TForm1.FormMouseMove(Sender: TObject; Shift: TShiftState; X, Y: Integer); begin if isMousePressed then begin Image1.Picture.Bitmap.Canvas.Pen.Mode:=pmNOT; Image1.Picture.Bitmap.Canvas.moveTo(StartX, StartY); Image1.Picture.Bitmap.Canvas.lineTo(EndX, EndY); EndX:=X; EndY:=Y; Image1.Picture.Bitmap.Canvas.moveTo(StartX, StartY); Image1.Picture.Bitmap.Canvas.lineTo(EndX, EndY); Image1.Picture.Bitmap.Canvas.Pen.Mode:=pmCopy end end; end. Более развернутую демку можно найти в папке {$DELPHI7}/Demos/Doc/Graphex Автор: Mischka |