Introduction - If you have any usage issues, please Google them yourself
Write a program, with three horizontal scroll bar respectively adjust the red, green, blue proportion in order to set a color, and as the foreground color in the color panel to draw a filled ellipse. (See sample code) to add a group of radio buttons, a different graph: solid rectangle, ellipse solid, hollow rectangle, hollow oval, with the above scroll to control the resulting color, draw different graphics