论文部分内容阅读
画空间图形的直观图,实际上就是用一个平面图形来表示空间图形。所以,要画空间的直观图,首先要会画水平放置的图形的直观图,通常有斜二测画法和正等测画法两种。斜二测画法的主要规则有两条:1.在已知图形中取互相垂直的轴Ox、Oy,画直观图时,把Ox、Oy画成对应的轴O′x′、O′y′,使∠x′O′y′=45°(或135°),O′x′和O′y′所确定的平面表示水平平面。2.已知图形中平行于x轴的线段,在直观图中与x′轴平行,且长度不变,平行于y轴的线段,在直观图中与y′轴平行,但长度为原长度
Draw a visual graphics space, in fact, is a graphic representation of space graphics. Therefore, to draw an intuitive view of the space, we must first draw a visual image of the horizontally placed graphic, usually with two oblique measuring methods and two equal measuring methods. Oblique two of the two main rules of the test method: 1. Known graphics in the mutual vertical axis Ox, Oy, draw the visual map, the Ox, Oy drawn as the corresponding axis O’x ’, O’y ’Such that ∠x’O’y’ = 45 ° (or 135 °), the plane defined by O’x ’and O’y’ represents the horizontal plane. 2. Line segments parallel to the x-axis of a known graphic parallel to the x ’axis in the visualization and parallel to the y-axis, parallel to the y’ axis in the visualization but of length of the original length