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Normal vector specification bytes draw only in the 16 predefined directions, and the longest length is 15. These restrictions help make shape definitions efficient but are sometimes limiting. With codes 8 and 9 you can draw nonstandard vectors using X-Y displacements. Code 8 specifies the X-Y displacement given by the next two bytes. Code 8 must be followed by two specification bytes in the format:
8,X-displacement,Y-displacement
The X-Y displacements can range from -128 to +127. A leading + is optional, and you can use parentheses to improve readability. The following example results in a vector that draws (or moves) 10 units to the left and three units up.
8,(-10,3)
Following the two displacement specification bytes, the shape returns to Normal Vector mode.
You can use code 9 to draw a sequence of nonstandard vectors. Code 9 specifies any number of X-Y displacement pairs. The code sequence is terminated by a (0,0) pair. The following example draws three nonstandard vectors and returns to Normal Vector mode.
9,(3,1),(3,2),(2,-3),(0,0)
You must terminate the sequence of X-Y displacement pairs with a (0,0) pair in order for AutoCAD to recognize any Normal Vectors or special codes that follow.