[cairo] How to get 1px line width SVGSurface>ImageSurface ?
behdad at behdad.org
Tue May 11 13:22:49 PDT 2010
On 05/11/2010 04:19 PM, Stuart Axon wrote:
> Is there any way to setup an SVGSurface so that when I have a line width of 1, this will be 1 pixel when I draw it do an ImageSurface?
Cairo uses different units for different surfaces. The raster surfaces are in
pixels while the vector surfaces are in points. And they are mapped 1-to-1,
so in that sense when copying from one surface to another cairo assumes a
72dpi. That is what you want.
> At the moment, the value 1 seems to make a really massive border.
Probably has more to do with the line not falling onto whole pixels. Try
adding a .5 pixel offset to each direction.
> Dividing by arbitrary numbers helps, but I'm not sure the numbers are right :)
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