CANNONBALL AND SL INGSHOT
Code Explanation
my = ev.layerY; ev.layerY for my
} else if (ev.offsetX || ev.offsetX == 0) { Does offsetX work?
mx = ev.offsetX; Use it for mx
my = ev.offsetY; Use offsetY for my
} Close if true
cball.sx = mx; Position ball x
cball.sy = my; ...and y
mysling.bx = mx; Position sling bx
mysling.by = my; ... and by
drawall(); Draw everything
} Close if in motion
} Close function
function finish(ev) { Function for mousedown
if (inmotion) { In motion?
inmotion = false; Reset inmotion
var outofcannon =
distsq(mysling.bx,mysling.by,
mysling.s1x,mysling.s1y)/700;
Base outofcannon proportional to square of
bx,by to s1x,s1yvar angleradians = -Math.atan2
(mysling.s1y-mysling.by,
mysling.s1x-mysling.bx);
Compute anglehorvelocity = outofcannon*Math.cos
(angleradians);
verticalvel1 = - outofcannon*Math.sin
(angleradians);