Arc Drawing and Geometry Guide

Arc Fundamentals

Arcs represent portions of a circle defined by:

• Center point and radius (like circles)
• Angular range (start and end degrees)
• Direction of sweep (typically counter-clockwise)

Angular Measurement

Angles are specified in degrees (0-359):

• 0° points to the right (3 o'clock position)
• 90° points downward (6 o'clock position)
• 180° points to the left (9 o'clock position)
• 270° points upward (12 o'clock position)
• Positive angles sweep counter-clockwise
• Angles wrap at 360° boundaries

Arc Types

1. Arc outline: Just the curved edge (CFBDGraphic_DrawArc)
2. Filled arc/sector: Arc plus two radii forming a pie slice (CFBDGraphic_DrawFilledArc)

Practical Applications

• Gauges and progress indicators
• Pie charts and donut charts
• Circular menus and dial controls
• Clock and timer displays
• Compass and rotation indicators
• Loading animations

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Updated on 2026-02-03 at 13:21:55 +0000