by rainyday » Tue Mar 19, 2013 4:24 am
let me see whether i understand correctly
a force apply to the balloon center
cpBodyApplyForce(balloon, force, CGPointZero);
as normal, the balloon should expand evenly in every direction
but chipmunk wont because it dont know which direction to apply force and how many force should apply
so we cant use chipmunk to simulate the expanding balloon
for my case, i just want the bullet increasing size in sprite and collision area while moving with a constant velocity
so is safe to use this?
cpPolyShapeSetVerts(bullet, numVerts, newVerts, CGPointZerooffset);
for constant velocity, i should use body->v instead of cpBodyApplyForce,right?