public static void collideRepelentAndMonster(RepelentBall b1, MonsterBall b2)
{
float newRadius = b1.radius / 2;
b1.radius = Math.Max(1, newRadius);
}
public static void collideRegularAndRepelent(RegularBall b1, RepelentBall b2)
{
b2.color = b1.color;
b1.speed.dx *= (-1);
b1.speed.dy *= (-1);
}