| 摘要 |
PURPOSE:To simply obtain display data to which a hidden surface processing is applied without using a memory for a special sorting by sequentially superposing picture element data constituting respective plotted graphics based on a drawing priority in the memory to a memory. CONSTITUTION:The picture element data constituting all the drawn graphics excluding the drawn graphic in which a priority number is stored is formed and only graphic data the nearest to a setting side is stored in a peak detection holding means. The picture element data constituting the drawn graphic again is formed by a painting out means and whether the graphic data stored in the peak detection holding means completely coincides with the picture element data constituting the respective plotted graphics formed thereafter or not is discriminated by a coincidence discriminating means. Thereafter, based on a discriminating signal from the coincidence discriminating means, the priority number indicating a second front side is formed and stored in a priority number storing means. According to the sequence of applied drawn priority numbers, all the drawn graphic data is painted out and displayed superposedly. |
