[whatwg] Blurry lines in 2D Canvas (and SVG)
glenn at zewt.org
Thu Jul 25 15:59:10 PDT 2013
On Thu, Jul 25, 2013 at 3:49 PM, Rik Cabanier <cabanier at gmail.com> wrote:
> You still need the scale though, otherwise the canvas content isn't zoomed
> (which is what the user requested)
(We were talking about device pixel ratios, not zooming--user zooming
scales the backing store, which is what we can't do anything about.)
I think we're misunderstanding each other, but I'm not sure where. If
you're on a 1.1x device, a 100x100 CSS "pixel" (px) box has 110x100
physical pixels. To draw cleanly into that box, you create a canvas with a
110x110 pixel backing store, and display it in the 100x100px region, eg.
<canvas width=110 height=110 style="width: 100px; height: 100px;">
You don't do any scaling within the 2d canvas itself, you just draw to it
like a 110x110-pixel canvas.
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