| 摘要 |
PURPOSE:To relieve the load of a DDA (digital differentiation analyzer) by dividing a straight line at every period and drawing the entire straight line by a calculation for only one period. CONSTITUTION:A period addition loop 200 adding period DELTAx, DELTAy of vectors P1,P2 to (x),(y) outputs of the digital differentiation analyzer 100 is provided and a display point coordinate for one period is calculated by the analyzer 100, then the coordinate of display points other periods is generated automatically by the period addition loop 200. Since the display points are arranged in a lattice in the directions of (x),(y), in drawing especially an oblique vector, the vector is drawn approximately in a form display point closest to the vector being selected. The pattern of the display points has the regularity also in such case and the repetition of the same patterns might be occurred. In calculating the coordinate of each display point in one period by the DDA, the period has only to be added to the coordinate of each display point so as to generate the coordinate of the remaining display points. |
