利用橡皮筋技术实现基本的绘制,包括绘制直线、元、椭圆、矩形。-Use rubber band to achieve the basic drawing techniques. Use rubber band to achieve the basic drawing techniques.

建立一个绘图菜单，至少包绘制矩形、拖动、颜色、设置等菜单项。点击颜色和设置弹出颜色对话框及线宽和线型对话框用及设置线条的属性。选择绘制矩形则使用橡皮筋技术完成矩形的绘制。选择拖动时，可使用鼠标拖动画完的矩形。-Establish a graphics menu, at least, drag rectangle bag drawing, color, setting menu item. Click on color and setting up the popup dialog and lin

一个简单的绘图程序，能够绘制点，线和矩形，并实现直线和矩形的橡皮筋功能和图形重绘功能-A simple drawing program, able to draw points, lines and rectangles, straight lines and rectangles rubber band functionality and graphics redraw function