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基本三角函数的计算： 角的正弦值 = 对边 / 斜边 角的余弦值 = 邻边 / 斜边 角的正切值 = 对边 / 邻边
角度制与弧度制的相互转换： 弧度 = 角度 * Math.PI / 180 角度 = 弧度 * 180 / Math.PI
向鼠标旋转(或向某点旋转)： // substitute mouseX, mouseY with the x, y point to rotate to dx = mouseX – sprite.x; dy = mouseY – sprite.y; sprite.rotation = Math.atan2(dy, dx) * 180 / Math.PI;
创建波形： // assign value to x, y or other property of sprite or movie clip, // use as drawing coordinates, etc. public function onEnterFrame(event:Event){ value = center + Math.sin(angle) * range; angle += speed; }
创建圆形： // assign position to x and y of sprite or movie clip, // use as drawing coordinates, etc. public function onEnterFrame(event:Event){ xposition = centerX + Math.cos(angle) * radius; yposition = centerY + Math.sin(angle) * radius; angle += speed; }
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创建椭圆： // assign position to x and y of sprite or movie clip, // use as drawing coordinates, etc. public function onEnterFrame(event:Event){ xposition = centerX + Math.cos(angle) * radiusX; yposition = centerY + Math.sin(angle) * radiusY; angle += speed; }
计算两点间距离： // points are x1, y1 and x2, y2 // can be sprite / movie clip positions, mouse coordinates, etc. dx = x2 – x1; dy = y2 – y1; dist = Math.sqrt(dx*dx + dy*dy);

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