在applet中开发的用异或方式重画，调用repaint方法的同心圆渐变的程序-In the applet in the development or use of different methods repaint, repaint method is called concentric gradient procedure

Java画图板，支持repaint（），形状保存，图片保存-Java drawing board, support the repaint (), shape save, save the picture

ios 小画板功能 ：撤销擦除，橡皮擦，重画和回撤功能，支持保存图片，加载图片！-ios small sketchpad function: revocation erase, eraser, repaint and retracement functional support to save the image, load the image!

Draw compass It uses a TPaintbox, Compass , to repaint the compass when needed. Compass is completely redrawn for each call so its owner (Panel1) has its Doublebuffered property set True to prevent flashing when the space is cleared before redrawin