1.交互式绘制图形（至少包括矩形和文本），绘制完成的图形能够正确地重现

2.绘制结果可以正确持久化

3矩形、文本的颜色、文本字体可调

4能够通过鼠标点击选中图形，并进行属性的修改，修改的内容可包括：位置大小颜色线型字体-1. Interactive Draw graphics (at least, including rectangles and text), draw the complete graph can correctly reproduce the two. Draw results can be properly persistence 3 rectangles, text color, text font adjustable through four mouse clicks to select graphics , and to attribute changes, modify the content may include: location of the font size of the color linear