投影理论与APPLE—Ⅱ上空间图形绘制

PROTECTIVE THEORY AND DRAWING A SPACE CURVE AND A SURFACE ON MICROCOMPUTER APPLE- II

本文将投影理论与APPLE—Ⅱ相联系,推导了在正轴侧投影、斜轴侧投影,及透视投影下空间点的坐标与投影点的屏幕坐标关系公式。运用这些公式,编制了两个代表性的实用程序,利用这两个程序可较快地绘制在指定投影下的曲面的投影图。(以椭球为例)其特色是指定投影时,比较任意。本文对CAI有一定参考价值且可作为师范院校学生学习计算机的补充内容。

This paper systematically state theory of projection. There are two practical programs which can complete drawing of Ellipse under given projection that may be central or orthogonal or ablique. these projections depended on some variableThe paper may apply to computer assistant instruction and may be used as reference material of learning computer, in normal college.