正方形，　圆形，　等边三角形，根据输入参数来确定各自的画图参数，如正方形的边长，圆的半径，等边三角形的底和高-Square, a circle, an equilateral triangle, and is determined based on the input parameters to the respective drawing parameters, such as the length of a side of the square, the radius of the circ