Objective
Improve the quality of the brush spacing with respect to velocity.
Design Revisions
Remove Spacing Limits
Current State: Spacing is set to 200% for fast.
Issue: Spacing does not respect the Paint Tool slider settings.
Solution: Spacing respects the slider values.
Background: This feature branch was a proposed solution to https://gitlab.gnome.org/GNOME/gimp/-/issues/1863
Visual Comparison:
Without Feature: Top is a slow stroke, middle line fast, lower is slow to fast.
With Feature: Top is a slow stroke, middle line fast, lower is slow to fast.
Implementation: Simplified Dynamic Spacing Calculation - Removed the formula that scaled spacing up to 200%. Now, dynamic spacing is directly multiplied by core->spacing, ensuring a simpler and more predictable behavior. The minimum spacing is clamped to EPSILON to prevent it from becoming too small.
Benefits: The new approach provides cleaner, more predictable spacing behavior, adhering more closely to user-defined values without arbitrary limits.