[Tutor] Empty GraphicsWindow

Alan Gauld alan.gauld at btinternet.com
Fri Nov 21 10:33:07 CET 2014

On 21/11/14 03:00, niyanaxx95 at gmail.com wrote:
> I need help figuring why my GraphicsWindow empty, I cannot figure out
> why it is empty.
> Here is my code :
> # Import graphics from module
> from graphics import GraphicsWindow

Since 'graphics' is not a standard part of Python can you tell
us where you are getting it from? Thee are at least 2 graphics
modules out there, probably more.

> tileSize = 0
> def main() :

>      # Draw graphics window
>      win = GraphicsWindow(roomWidth, roomLength)
>      canvas = win.canvas()
>      # Draw the checkered surface
>      for row in range(numRows) :
>          # If the row is even
>          if row % 2 == 0 :
>              # If the column is even set color to black, if odd yellow
>              drawRow(canvas, row, gapX, numCols, gapY, "black", "yellow")
>          # If the row is odd
>          else:
>              # If the column is even set color to yellow, if odd black
>              drawRow(canvas, row, gapX, numCols, gapY, "yellow", "black")
>      win.wait()

What does win.wait() do? Usually there is some kind of refresh() or 
update command to force a canvas to redraw itself. wait() sounds more 
like it just leaves the window in-situ until something closes it?

But without knowing anything about your library its hard to be sure.

You may have more luck finding an expert by contacting a forum for
your specific graphics package.

Alan G
Author of the Learn to Program web site
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