[Bargest]

1)

Код:

Form1.Canvas.MoveTo(10,10); 
Form1.Canvas.LineTo(100,100); 

2)

Код:

//Image1.Transparent = true;
Image1.brush.color:=clWhite;
Image1.FillRect(rect(0,0,Image1.width-1,image1.height-1));
Image1.Canvas.MoveTo(10,10);
Image1.Canvas.LineTo(100,100);