单的操作步骤尤其适合初次接触编程的青少年，使其通过简单的指令方法在窗口中绘制复杂的几何图形。 本程序是用于辅导子女学习编程的演示程序，因此不含自定义函数功能。-Single steps is particularly suitable for the initial contact with the youth program to make it through simple methods of instruction in the window rendering complex ge