[MQL5] Bezier curves remain a general tool, but UI geometry is

Bezier curves remain a general tool, but UI geometry is dominated by arcs and rectangles with corner radii. Approximatin

A circle arc can be flattened into chords with a segment count derived from the sagitta bound. One acos gives the maximum per-segment angle for a pixel tolerance, then the count is rounded up. Guards cap unusable extremes: overly large tolerance clamps the step to π, and microsco…

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