1. A graphics generator for driving a display in response to plural groups of pattern segment defining input signals to produce a visual pattern on said display including a visual representation of said pattern segments, said graphics generator providing first and second periodically varying output signals from first and second output registers with each successive pair of said output signals differing from a preceding pair by an amount producing a stroke of constant length on said display, said graphics generator comprising: rotation control means responsive to one of said pattern segment defining signals to store a quantity representative of at least initial pattern segment orientation, first means with sine and cosine outputs, producing respectively, sine and cosine functions of an input, said first means coupled to said rotation control means and receiving said input therefrom, a first and second adder, each with a first input, said first input of said first adder connected to said sine output and said first input of said second adder connected to said cosine output, said first and second output registers responsive, respectively, to outputs of said first and second adders, second inputs of said first and second adders connected, respectively, to outputs of said first and second output registers, clocking means for periodically strobing each of said output registers to accept and store said first and second adder outputs, whereby quantities stored in respective output registers, periodically change in accordance with quantities provided to each respective adder by said first means.