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;
}
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);
转换为十进制：
trace(hexValue);
十进制转换为十六进制：
trace(decimalValue.toString(16));
颜色合成：
color24 = red << 16 | green << 8 | blue; color32 = alpha << 24 | red << 16 | green << 8 | blue;
颜色提取：
red = color24 >> 16; green = color24 >> 8 & 0xFF; blue = color24 & 0xFF; alpha = color32 >> 24; red = color32 >> 16 & 0xFF; green = color32 >> 8 & 0xFF; blue = color232 & 0xFF;
过控制点的曲线：
// xt, yt is the point you want to draw through // x0, y0 and x2, y2 are the end points of the curve x1 = xt * 2 – (x0 + x2) / 2; y1 = yt * 2 – (y0 + y2) / 2; moveTo(x0, y0); curveTo(x1, y1, x2, y2);
角速度转换为 x,y 速度向量：
vx = speed * Math.cos(angle); vy = speed * Math.sin(angle);
角加速度(作用于物体上的 force )转换为 x,y 加速度：
ax = force * Math.cos(angle); ay = force * Math.sin(angle);
将加速度加入速度向量：
vx += ax; vy += ay;
将速度向量加入坐标：
movieclip._x += vx; sprite.y += vy;