math: animation(s)

• sine = opposite / hypotenuse [03]
• cosine = adjacent / hypotenuse
• tangent = opposite / adjacent
• radians = degrees * Math.PI / 180
• degrees = radians * 180 / Math.PI
• rotation = Math.atan2(dy,dx) * 180 / Math.PI
• distance = Math.sqrt(dx*dx + dy*dy);
• (rotational) vx = speed * Math.cos(angle); [05]
• (rotational) vy = speed * Math.sin(angle);
• (rotational) ax = force * Math.cos(angle);
• (rotational) ay = force * Math.sin(angle);
• x1 = Math.cos(angle) * x - Math.sin(angle) * y; [10]
• y1 = Math.cos(angle) * y + Math.sin(angle) * x;
• distance = Math.sqrt(dx*dx + dy*dy + dz*dz); [15]

assumption(s) -- dx = ms.X - spr.x; dy = ms.Y - spr.y;