From: Joel VanderWerf <vjoel@...>
Date: 2007-10-12T13:31:32+09:00
Subject: Re: ruby tk drawing a line

Ed Redman wrote:
> I have a question concerning ruby/tk and drawing lines on a canvas.
> I tried to convert from a tcl program. 
> Everything works fine except that the line when its thickness is large 
> appears to be a series of short line segments rather than a solid line.
> 
> I have binded the "1" mouse button to start the line with the following
> 
> canvas.bind( '1', proc { |e| 
> 			     
>                              $startx = e.x
>                              $starty = e.y
>                              
>                              })
> 
> and the motion of the mouse
> 
> canvas.bind('B1-Motion', proc { |e| 
>       $endx = e.x
>       $endy = e.y
>                         
>       $a  = TkcLine.new(canvas, $startx, $starty, $endx, $endy)
>       $a.width option.value
>       $a.fill "#{color}"
>       })
> 
> Can anyone see why this does not give me a solid line

Does the same thing happen without the fill param?

A TkcLine has a "dash" parameter, and that might be causing this. But it 
would be surprising if the default is a dashed line. Anyway, you could try

   $a.dash ""

or

   $a.dash nil

See

   http://www.tcl.tk/man/tcl8.4/TkCmd/canvas.htm#M27

for details.

-- 
       vjoel : Joel VanderWerf : path berkeley edu : 510 665 3407