public Region[] MeasureCharacterRanges (string text, Font font, RectangleF layoutRect, StringFormat stringFormat)
{
if ((text == null) || (text.Length == 0))
return new Region [0];
if (font == null)
throw new ArgumentNullException ("font");
if (stringFormat == null)
throw new ArgumentException ("stringFormat");
int regcount = stringFormat.GetMeasurableCharacterRangeCount ();
if (regcount == 0)
return new Region[0];
IntPtr[] native_regions = new IntPtr [regcount];
Region[] regions = new Region [regcount];
for (int i = 0; i < regcount; i++) {
regions[i] = new Region ();
native_regions[i] = regions[i].NativeObject;
}
Status status = GDIPlus.GdipMeasureCharacterRanges (nativeObject, text, text.Length,
font.NativeObject, ref layoutRect, stringFormat.NativeObject, regcount, out native_regions[0]);
GDIPlus.CheckStatus (status);
return regions;
}