语法：

motion_set(dir, speed);

返回： N/A（无返回值）

描述

This function sets a new direction of movement and a new speed to the instance running the code. Note that this does not add to the instances current speed and direction (for that you would use motion_add) but rather forces it to the new settings.

例如：

if irandom(9) = 1 motion_set(random(360), 1 + random(3));

This above code will make the instance change speed and direction at random intervals.