选择当前物体的子物体 Select Child
选择当前物体的父物体 Select Ancestor
冻结当前物体 Free selecetion
只输出当前选择物体 Export Selected Objects Only
输出当前所选择的物体 Export selected
通过轮廓间的旋转匹配，还可确定当前物体与库存物体的相对旋转角度。
The relative rotation Angle between the current object and the stock one is obtained by rotary match between their contours.
下例中创建了两种颜色，并将他们混合在一起，并使用混合色填充当前物体。
The following example creates two colors, blends them together, and fills the active shape with the blended color.
一旦此调用针对当前时间步长返回，就可以清空上一步长施加到这些物体上的力，然后获得动态物体的当前方位和角度。
Once the call returns for the current time step, you clear the forces applied to the objects from the last step, and then get the current position and Angle of your dynamic body.
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