游戏开发中的数学和物理算法

http://www.cnblogs.com/HelloCG/category/172682.html

 

定义点：

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function Point(x,y) {   this.x = x;   this.y = y; }

两点间的距离：

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function pointDistance(p1, p2) {    var dx = p1.x - p2.x;    var dy = p1.y - p2.y;    var distance = Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));    return distance;  }

定义圆：

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function Circle(point, r) {    this.center = point;    this.radius = r; }

圆的碰撞检测：

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fuction collisionBetweenCircles(circle1,circle2) {   var hit;   var powerOfDistanceOfCenter = Math.pow((circle1.center.x - circle2.center.x), 2) +         Math.pow((circle1.center.y - circle2.center.y), 2));   var powerOfDistanceOfRadius = Math.pow(circle1.radius + circle2.radius, 2);   if (powerOfDistanceOfCenter <= powerOfDistanceOfRadius) {     hit=true;   } else {     hit=false;   }   return hit; }