>> Also, you should disable screen font substitution via -[NSLayoutManager >> setUsesScreenFont:NO]. >> >> This is the main source of glyph advancement differences you're seeing. > > Thanks Aki, indeed this has removed the small horizontal offset that was > there. > > I am however unable to figure out where the small vertical offset comes from. > Using NSLayoutManager's defaultBaselineOffsetForFont method, I have tried > getting the default baseline offset for the text at the max zoom level, and > the baseline offset for the text at the current zoom, then find the > difference and set the NSBaselineOffsetAttributeName attribute accordingly. > However, this approach works at certain zoom levels and not at others!
My apologies, I just realized I explained this incorrectly. I'm basically just getting the default baseline offset for the font at the max zoom, then multiply it by (currentZoomFactor/maxZoomFactor), then finally subtracting the default baseline offset for the font at the current zoom. So it looks something like this: float baselineAtMaxZoom = [layoutManager defaultBaselineOffsetForFont:fontAtMaxZoom]; float interpolatedBaselineAtCurrentZoom = baselineAtMaxZoom * factor / kWorkspaceMaxZoomFactor; float offset = baselineAtCurrentZoom - [layoutManager defaultBaselineOffsetForFont:fontAtCurrentZoom]; > I've also tried using the same approach for line height, where I interpolate > what the line height should be given the line height at the max zoom level > (with the help of NSLayoutManager's defaultLineHeightForFont method), then > set the minimum and maximum line height of the paragraph style accordingly. > At some zoom levels, this works, but at other zoom levels, this make the > vertical offset even worse. > > Could anyone shed some light as to what the issue might be here? _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
