In MATLAB, there are many functions that create regions filled with solid colors (e.g. contourf, area, bar). To do this, a function creates "patch objects" and assigns a single color to each one. Instead of a solid fill, one often wants to fill a patch with a hatch or speckle pattern instead. MATLAB has no built-in way to do this.
The hatchfill function fills patch objects with hatching or speckling. In most cases, adding hatching to a 2D plot requires only three lines of code. For example:
[c,h] = contourf(x,y,z,[0 0]);
hp = findobj(h,'type','patch');
This fills the zero contour with hatching. Hatchfill takes additional parameters if custom patterns are desired. This package incorporates code from Rich Pawlowicz, Iram Weinstein, and Kirill Pankratov.
Neil Tandon (2021). Hatchfill (https://www.mathworks.com/matlabcentral/fileexchange/30733-hatchfill), MATLAB Central File Exchange. Retrieved .
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