Feature: Plot filled contour #634
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… data, reporducing the function of contourf(x, y, z) in Matplotlib.
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This PR adds a function to plot filled contour according to a regular/irregular grid of data. It reproduces the function of contourf(x, y, z) in Matplotlib. The implementation is inspired by Surface plots in ImPlot3D. Existing plot functionality is unaffected.
An example, Demo_ContourFill, is added into the implot_demo.cpp, as shown in the figure below. Three 1D float arrays are required as inputs, two for coordinates x and y, and one for z (could be the values of height, temperature or density, etc).
Please let me know if there is any comment or suggestion.