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Learning Perl/Tk
book

Learning Perl/Tk

by Nancy Walsh
January 1999
Beginner content levelBeginner
373 pages
9h 43m
English
O'Reilly Media, Inc.
Content preview from Learning Perl/Tk

9.11. Translating Coordinates

When you set up a callback and use the Ev('x') and/or Ev('y') arguments to find out where the user clicked, you must translate that information into canvas coordinates (Ev is explained in Chapter 14). To do this, use the canvasx and canvasymethods:

$x = $canvas->canvasx(screenx [, gridspacing ]);
$y = $canvas->canvasy(screeny [, gridspacing ]);

Each method takes an optional gridspacing argument; then the canvas coordinate value will be rounded to the nearest value to fit the grid.

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Publisher Resources

ISBN: 1565923146Supplemental ContentCatalog PageErrata