volatilegraphics.java

来自「java learn PPT java learn PPT java learn」· Java 代码 · 共 32 行

     import java.applet.*;
     import java.awt.*;
     import java.awt.image.*;

     public class VolatileGraphics extends BufferedGraphics
     {
          public VolatileGraphics(Component c)
          {
               super(c);
               createBuffer();
          }

          protected void createBuffer()
          {
               Dimension size = parent.getSize();
               buffer = parent.createVolatileImage(size.width, size.height);
          }

          protected boolean isValid()
          {       
               if(! super.isValid()) return false;

               if(((VolatileImage)buffer).validate(parent.getGraphicsConfiguration()) == 
                    VolatileImage.IMAGE_INCOMPATIBLE)
               {
                    return false;
               }

               return true;
          }
	
     }    // VolatileGraphics