Another particle simulation !
New : use the mouse (see below) to draw your own obstacles.
I use a grid to speed up the search for neighbors, and precompute a sort of distance field for the collisions with the shapes.
Keys :
'0' to '9' to choose a predefined shape
space bar to reset the particles
backspace to toggle the bottom border
mouse click to activate the mouse repulsion
shift + mouse click to draw
control + mouse click to erase
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