Dev/refactoring bezier

[SThor]

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[Copilot]

Pull Request Overview

This PR refactors the Bézier curve drawing functionality in PaperAndPencil.java to better support fade effects and improve code modularity. Key changes include:

• Extraction of helper methods (calculateFadeAlpha and plotBezierCurve) to centralize fade calculations.
• Consolidation and refactoring of the cubic Bézier and spline drawing methods.
• Revised logic in the spline method to handle fade effects for the first segment differently when fadeFirstSegmentOnly is true.

Files not reviewed (1)

• examples/BasicExample/BasicExample.pde: Language not supported

Comments suppressed due to low confidence (2)

src/paperandpencil/PaperAndPencil.java:198

• [nitpick] Consider clarifying parameter names or adding inline documentation for 'fadeStart' and 'fadeEnd' to indicate their expected ranges and roles in the fade calculation.

private float calculateFadeAlpha(float progress, float fadeStart, float fadeEnd) {

src/paperandpencil/PaperAndPencil.java:298

• Verify that the behavior in the first segment branch—using the simple bezier() method to apply fade—yields the intended visual outcome, as the fade logic now differs from that applied in subsequent segments.

if (fade && fadeFirstSegmentOnly && currentSegment == 0) {