A small 2d physics demo calculating collisions and forces between polygons. Implemented in JavaScript without libraries.

Try it here: https://villevli.github.io/physics2d-js/

Controls

• Click to give all objects an impulse towards the clicked point
• Press "c" to create a 5-gon at the cursor
• Press "w" to draw polygons without fill color
• Press "d" to draw the normal vector of all collisions with red
• Press "space" to pause the simulation and "s" to run one step
• Press "+" to lessen gravity
• Press "-" to increase gravity

Known issues

• Friction not implemented
• Sometimes polygons can overlap presumably due to collision checks not working when the corners (vertices) of two polygons collide each other directly
• Sometimes when the browser is unfocused and focused again the existing polygons disappear. Did they fall outside the walls?