Enhance the WPF Polar Chart control by adding support for a semi-circular rendering mode. This feature will allow users to visualize polar data in a half-circle layout, improving readability and offering more flexible charting options for specific use cases.
- Polar chart renders correctly in semi-circular mode. [with specified start and end angle]
- Axis labels, grid lines, and data points adjust to mention angles.
- No regressions in full-circle mode or other chart features.
- Feature is validated across supported WPF versions and themes.