bcb6用于复杂图形的绘制，包括了水晶石图案和蜘蛛网图案，利用鼠标绘制图形，动画图形的实现， 综合绘图板实例分析，包括源码和可执行程序-bcb6 used to draw more complex shapes, including rock crystal pattern and spider web pattern, use the mouse to draw graphics, animated graphics implementation, integrated drawing board instance analysis, including source code and executable programs