编写程序，利用三个水平滚动条分别调节红、绿、蓝比例，以此设定一个颜色，并将它作为前景色，在面板上画出一个该颜色的填充椭圆。(参见示例代码) 增加一组单选按钮，分别选择不同图形：实心矩形、实心椭圆、空心矩形、空心椭圆，利用上述滚动条调节得到的颜色，绘制不同的图形 -Write a program, with three horizontal scroll bar respectively adjust the red, green, blue proportion in order to

做一个简单的画图工具，如下图所示。可以根据用户的选择项画出至少3种图形（直线、椭圆、矩形）。-Do a simple drawing tools, as shown below. According to the project selected by users at least 3 kinds of graphics (line, ellipse, rectangle).

ECC椭圆加密代码，内含样例代码。是java版本的，很好，建议收藏！-ECC ellipse encryption code, it contains sample code. Is a Java version, is very good, it is recommended that the collection!

在界面中自定义拖拽绘制长方形和椭圆，并使用修饰模式对已有图形加边框，加标签。-Custom drag to draw rectangle and ellipse in the interface, and use the decorator pattern of the existing graphics add borders, add labels.