Draw a slash on a plane coordinate

          Drawing a slash on the screen is to draw a slash through two vertices , So you need to draw a right triangle with this slash , And the slash is the hypotenuse of a right triangle . The right triangle determines its x And y Coordinate The ratio of , And then to x by The independent variables , With y by The dependent variable Get the relation ： y = x * z . Then determine the arguments x The range of coordinates , By bringing in x The corresponding value can be obtained y Coordinate value , Then draw at the corresponding point , The slash can be drawn .