Table of Contents
ex_gui_slider_handle.c
A slider's handle stays inside the widget at every value (headless). The handle is a circle centred on the value's position. Centring it on the widget's own left edge at the minimum puts half the circle outside the widget, where the clipping rectangle cuts it off, so a slider sitting at its minimum drew a half moon rather than a handle; the maximum had the same fault on the other side.
The centre travels along a strip inset by the handle's radius at each end instead. The same strip is what a press or a drag is measured against, so the handle still lands under the pointer; measuring the drag against the whole widget while drawing the handle on the inset strip would put the two a radius apart at the ends, which is worse than the fault it fixed.
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