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Flash AS制作小球自由运动和碰撞检测的动画
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日期：2007年9月23日 作者： 查看:[大字体
中字体 小字体]
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collisionision_angle = Math.atan2(dy, dx);
magnitude_1 = Math.sqrt(ball.xspeed*ball.xspeed+ball.yspeed*ball.yspeed);
magnitude_2 = Math.sqrt(ball2.xspeed*ball2.xspeed+ball2.yspeed*ball2.yspeed);
direction_1 = Math.atan2(ball.yspeed, ball.xspeed);
direction_2 = Math.atan2(ball2.yspeed, ball2.xspeed);
new_xspeed_1 = magnitude_1*Math.cos(direction_1-collisionision_angle);
new_yspeed_1 = magnitude_1*Math.sin(direction_1-collisionision_angle);
new_xspeed_2 = magnitude_2*Math.cos(direction_2-collisionision_angle);
new_yspeed_2 = magnitude_2*Math.sin(direction_2-collisionision_angle);
final_xspeed_1 = ((ball.mass-ball2.mass)*new_xspeed_1+(ball2.mass+ball2.mass)*new_xspeed_2)/(ball.mass+ball2.mass);
final_xspeed_2 = ((ball.mass+ball.mass)*new_xspeed_1+(ball2.mass-ball.mass)*new_xspeed_2)/(ball.mass+ball2.mass);
final_yspeed_1 = new_yspeed_1;
final_yspeed_2 = new_yspeed_2;
ball.xspeed = Math.cos(collisionision_angle)*final_xspeed_1+Math.cos(collisionision_angle+Math.PI/2)*final_yspeed_1;
ball.yspeed = Math.sin(collisionision_angle)*final_xspeed_1+Math.sin(collisionision_angle+Math.PI/2)*final_yspeed_1;
ball2.xspeed = Math.cos(collisionision_angle)*final_xspeed_2+Math.cos(collisionision_angle+Math.PI/2)*final_yspeed_2;
ball2.yspeed = Math.sin(collisionision_angle)*final_xspeed_2+Math.sin(collisionision_angle+Math.PI/2)*final_yspeed_2;
}
_root.onEnterFrame = function() {
for (x=1; x<number_of_balls; x++) {
for (y=x+1; y<=number_of_balls; y++) {
distance_x = Math.abs(_root["ball_"+x]._x-_root["ball_"+y]._x);
distance_y = Math.abs(_root["ball_"+x]._y-_root["ball_"+y]._y);
distance = Math.sqrt(distance_x*distance_x+distance_y*distance_y);
if (distance<=30 && (_root["ball_"+x].collision == 0 or _root["ball_"+y].collision == 0)) {
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