Hi,
I'm trying to port some existing code to use osgText instead of a previous
font-rendering library, and hitting up against the osgText API. In particular,
I'm struggling to measure text without setting it on a osgText::Text instance.
I guess this is because the font-size and pixel size (and even transformation
matrix?) must be known to compute a size, but the code I'm coming from
frequently does things like:
double width = widthOfString("lorum ipsum etc");
// or indeed, height of the string
if (width > blah) {
... take some action
} else {
... take some radically different action
}
The problem is if start setting line-wrapping or a maximum width on the
osgText::Text, it seems as if the computed bounding box is going to respect
those values. I think I need a way to measure the glyph bounds as if line
wrapping / maximum sizes were ignored. (Without saving / resetting / restoring
them)
(There's also the issue of needed to create the text-node to perform the
measurement at all, but I guess I can't escape that)
Am I missing some API features, or is this simply not possible?
BTW, all this text will be drawn with no scaling / rotation, in screen-space,
with orthographic projection. I realise osgText can't assume that in the
general case, of course. So, for example, if I could abuse the Font API to
measure glyph bounds, that might work quite well for me.
James
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