On 6/21/21 11:43 PM supsm17 wrote:

Thanks. I've noticed that widget->measure_label() and fl_measure() have the same value, which isn't correct. fl_text_extents() has a different value which is closer, but still isn't the correct value. Do you know why this is?

As Greg already wrote, fl_text_extents() should be absolutely exact but it's a little more difficult to use. You can see both fl_measure() and fl_text_extents() "in action" in our test/unittests.cxx demo program in the "rendering text" and "symbol text" examples (the latter only with fl_measure()).

A potential problem with using these functions is that you need to set the font before you call the measure functions. Otherwise a random font will be used for measurement. This might explain your differences.

If you can't find a solution, I suggest that you post your code in form of a minimal, but compileable source code here. Then we can see why it doesn't work for you and help.