窗口下用QPainter实现各种图形的绘制，并可选画笔线宽,画笔颜色，画笔线型等，以及区域图内的填充样式，填充颜色-Using QPainter to draw many kinds of graphics under the Window environment. User can select optionally pen width, pen color, pen linestyle, as well as regional area of the fill style and fil