3D function plotter and heat map for functions of two variables

For a function f (x,y), function values ​​are determined over an equidistant point grid of the xy plane and plotted in the direction of the z axis.
The resulting surface is displayed in a 3D function diagram. Alternatively, the data can also be displayed as a 2D heat map.
Because linear interpolation is used to determine the isolines, the entire area is covered by triangular surfaces supported on a grid of approximately 900 points.
The 3D presentation can be rotated by clicking with the mouse.

x1 x2 y1 y2
Examples 3D-View

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