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4. Tuner Window

Tuner Window

The tuner window is a specialized editor for the CurveGrid-based interpolation data used to explore and adjust curve families.

What it shows

• a lattice of angle-space sample points
• an interpolated curve preview for the current pointer position
• draggable control points for selected master curves
• a curvature plot for the currently rendered curve
• an optional generated curvature map image

How it is initialized

At startup, the tuner creates a default CurveGrid by:

1. sampling th0 and th1 over a triangular lattice
2. generating a base cubic with TwoParamCurve_MyCubic
3. raising that cubic into TwoCubics
4. storing the result as the master data set

Load and save

The tuner can serialize and deserialize the grid using CurveGrid.ToJson() and CurveGrid.FromJson(). This is separate from the main drawing JSON format.

Editing behavior

When a master lattice point is selected, the tuner exposes four draggable control handles. Moving those handles updates the underlying TwoCubics data, with extra symmetry logic when the selected point lies on a symmetric or antisymmetric axis.