Comment #16 on issue 16107 by [email protected]: WebKit: Vector
Drawing, altering stroke properties crash
http://code.google.com/p/chromium/issues/detail?id=16107
Just as a followup to the Maps API issue, it turns out the submitted code
is using an
incorrect datatype. Here are the comments from the Maps team:
---
It looks like the error is actually a typo in the sample code:
"""
polygon.setStrokeStyle({weight:'5'})
"""
This should actually be:
"""
polygon.setStrokeStyle({weight:5})
"""
(weight is a number, not a string).
The way that the canvas size is extended to cope with stroke weights is
very simple
(add a strokeWeight tolerance) on each side of the bounds. However, because
of the
inconsistent way JS handles type coercion between strings and numbers
interesting
stuff happens if the weight is a string.
Suppose the canvas is supposed to be placed from pixel 50 to pixel 100 on
the X axis
and the stroke weight is 5, we expect:
var left = 50 - 5 == 45;
var right = 100 + 5 == 105;
var width = right - left = 60;
But if the stroke weight is '5':
var left = 50 - '5' == 45;
var right = 100 + '5' == '1005'; // Addition defaults to string
concatentation
var width = right - left == 960; // Big difference!
Hope that helps!
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