Add PCHIP interpolation to line visualizations - #2063
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Linear interpolation makes sparse, irregular samples (e.g. adaptive ODE output) look jagged; PCHIP (Moler, NCM §3.4) is $C^1$ and never overshoots the data. The vertex shader evaluates the cubic from one `x, y, z, slope` per point, subdividing each interval only as far as a 1 px error bound needs at the current zoom. Closes silx-kit#1945.
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Linear interpolation makes sparse, irregular samples (e.g. adaptive ODE output) look jagged; PCHIP (Moler, Numerical Computing with Matlab §3.4) is$C^1$ and never overshoots the data. The vertex shader evaluates the cubic from one $10^6$ points. Closes #1945.
x, y, z, slopeper point, drawing only as many segments per interval as the zoom needs; memory and frame time match linear at