直线的中点生成算法，通过输入两个坐标点，生成斜率<1的直线！可以改变颜色！-The midpoint of a straight line generating algorithm, by entering the coordinates of two points, to generate the slope of <1 in a straight line! Can change the color!

能在一个平面坐标系中画一个五角星，输入指定的坐标点P(x,y)以及这个五角星绕P点旋转的角度a,运行就可以让五角星绕P点旋转的角度a。-In a plane coordinate system in a draw five-pointed star, enter the designated point coordinates P (x, y), as well as the five-pointed star around the P point of rotation angle a, ca

从txt文件中读取的数值,绘制8行8列的坐标点-From the txt file to read the image coordinates of point values, draw 8 rows and 8 columns of the coordinates of a point