| 摘要 |
A high speed display processing unit (DPU) for displaying vectors on a cathode ray tube is disclosed. Each vector to be displayed is classified as to whether it is virtual, visible or both. If the displayed vector is partially visible, a digital section of the DPU calculates the length of the visible portion of the vector. Prior to drawing the vector, the digital section determines the major axis of the vector and its tangent. Each of the above values is provided to an analog section of the DPU which then draws at a constant velocity the visible vector. The DPU also includes circuitry for scaling, offset calculations and light pen hits.
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