Bresenham line and circle algorithms, just practicing F# libraries

Controls: left click and drag = draw a basic line right click and drag = draw a circle with origin where mouse was pressed, edge where mouse released middle mouse click = clear the screen ctrl + middle click = memoize the screen (very laggy to calculate for the whole screen) ctrl + right click = draw line of sight in circle from where the mouse was clicked alt + left click and drag = draw continuously