>I am drawing some text on to a canvas with the brush style set to clear.
>But when I draw some more text, it still has the old text there and its
>all jumbled up.
There is probably a much easier way but as the problem is 'unwriting' what you wote,
how about
1. writing to a separate canvas and then XORing the text in and XORing it back out
again or perhaps
2. just keeping a copy of the piece of the canvas before the text was written or
3. if you know you haven't got a collision problem unwrite the text with the
background colour.
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