Figure 3 Arc projection length J calculation (when left is G=G x , right is G=G y )
For the machining direction problem of the arc (shun, counterclockwise), since the group code data of the Auot CAD arc is all specified in the counterclockwise direction, the program will retain the coordinates of the end point of the previous entity and assign it to the variable ZhD. If the next entity is an arc, compare ZhD with the starting point coordinates of the arc Q x, y . If the same indicates that the arc is counterclockwise, otherwise the arc is clockwise, then the starting point and end point of the arc are exchanged. . The block diagram is shown in Figure 4.
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