image1.Canvas.Pen.Width := 10 不起作用的原因？

Question

     
这样写的：
            image1.Canvas.Pen.Width := 10;             image1.Canvas.Pen.mode:=pmnot; //笔的模式为取反              image1.Canvas.DrawFocusRect(rect( ydx,ydy,htdx,htdy) );width 无论写多少都没变化，什么原因

Answer 1

不要用drawfocusrect
用self.Image1.Canvas.Rectangle(10,10,50,50);

Answer 2

Rectangle画的是实心的矩形，是不是drawfocusrect就不支持笔的宽度设定？

Answer 3

是
你可以通过修改brush的style使矩形变为空心的  self.Image1.Canvas.Brush.Color:=clBlue;
  self.Image1.Canvas.Brush.Style:=bsClear;
  self.Image1.Canvas.Pen.Width:=10;
  self.Image1.Canvas.MoveTo(20,20);
  self.Image1.Canvas.LineTo(60,60);
  self.Image1.Canvas.Rectangle(10,10,50,50);