picksize - sets the dimensions of the picking region
void picksize(deltax, deltay)
short deltax, deltay;
deltax expects the new width of the picking region.
deltay expects the new height of the picking region.
picksize changes the dimensions of the picking region. The default
setting is 10 pixels. The picking region is rectangular and is centered
at the current cursor position, the origin of the cursor glyph. In
picking mode, any objects that intersect the picking region are reported
in the picking buffer.
This routine is available only in immediate mode.
picksize cannot be called within a pick()/endpick() block.
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