截屏

gukuitian 2009-09-24 01:14:11

头几天在这论坛上看见的一个程序，今天玩了下，看见有点小BUG，改了下，拿出来给原作者点评





import java.awt.*;

import java.awt.datatransfer.*;

import java.awt.event.*;

import java.awt.image.BufferedImage;

import java.io.IOException;

import javax.swing.*;



@SuppressWarnings("serial")

public class GetScreen extends Frame

{

	private static PanelImage panelImage;

	private static Graphics g;

	//记录屏幕.size()

	private static Dimension screenDims;

	//用于设置全屏

	private GraphicsDevice gd = GraphicsEnvironment.getLocalGraphicsEnvironment().getDefaultScreenDevice();

	//矩形的平面坐标和宽高，

	private static int x,y,w,h;



	public static void main(String args[])

	{

		GetScreen getScreen=new GetScreen();

		//关闭窗口时退出程序

		getScreen.addWindowListener(new WindowAdapter() 

		{

			public void windowClosing(WindowEvent e) 

			{

				System.exit(0);

			}

		});

	}

	public GetScreen()

	{

		add(getPanelImage());

		// 去掉窗口的边框

		this.setUndecorated(true);

		// 设置全屏

		gd.setFullScreenWindow(this);

		// 窗体始终靠前

		this.setAlwaysOnTop(true);

		setVisible(true);

	}



	public JComponent getPanelImage()

	{

		panelImage=new PanelImage(getScreenImage());

		//设置监听

		panelImage.addMouseListener(new MouseAdapter()

		{

			//鼠标抬起：截取图片->存入剪切板->退出程序

			public void mouseReleased(MouseEvent e)

			{

 				setClipboardImage(panelImage.getImg(x, y, w, h));

 				JOptionPane.showMessageDialog(null,"已经复制到剪切板");

 				System.exit(0);

			}

			//mouse按下：记录矩阵的起点坐标

			public void mousePressed(MouseEvent e)

			{

				x=e.getX();

				y=e.getY();

			}

		});

		panelImage.addMouseMotionListener(new MouseAdapter()

		{

			//鼠标拖动:重新显示图片->画矩形->记录图片的宽高

			public void mouseDragged(MouseEvent e)

			{

				g=panelImage.getGraphics();

				panelImage.paintComponent(g);



				g.setColor(Color.black);

				g.drawLine(x, y, e.getX(), y);

                g.drawLine(x, y, x, e.getY());

                g.drawLine(x, e.getY(), e.getX(), e.getY());

                g.drawLine(e.getX(), y, e.getX(), e.getY());

                g.dispose();



                w=e.getX()-x;

				h=e.getY()-y;

			}

		});

		return panelImage;

	}

	/**

	 * 获取屏幕画面

	 * @return BufferedImage 

	 */

	private static BufferedImage getScreenImage()

    {

        Robot robot;

        try

        {

            robot = new Robot();

        }

        catch (Exception e)

        {

            throw new RuntimeException("unable to construct Robot");

        }

        // 获取屏幕尺寸

        screenDims = Toolkit.getDefaultToolkit().getScreenSize();

        // 获取屏幕画面

        BufferedImage screen = robot.createScreenCapture(new Rectangle(0, 0,

                screenDims.width, screenDims.height));

        return screen;

    }

	/**

	 * 把图片存入剪切板

	 * @param image 要存入的图片

	 */

	private static void setClipboardImage(final BufferedImage image)

	{

		Transferable trans = new Transferable()

		{

			public DataFlavor[] getTransferDataFlavors()

			{

				return new DataFlavor[]{ DataFlavor.imageFlavor };

			}

			

			public boolean isDataFlavorSupported(DataFlavor flavor)

			{

				return DataFlavor.imageFlavor.equals(flavor);

			}

		

			public Object getTransferData(DataFlavor flavor)

		        throws UnsupportedFlavorException, IOException

		        {

				if (isDataFlavorSupported(flavor))

					return image;

				throw new UnsupportedFlavorException(flavor);

		    }

		};

		Toolkit.getDefaultToolkit().getSystemClipboard().setContents(trans,null);

	}

}

@SuppressWarnings("serial")

class PanelImage extends JPanel

{

	private BufferedImage img;

	public PanelImage(BufferedImage img)

	{

		this.img=img;

	}

	/**

	 * 截取子图片；

	 * @param x 子图片的 x 坐标;

	 * @param y 子图片的 y 坐标;

	 * @param w 子图片的宽，为负值时表示鼠标向起点的左边拖动;

	 * @param h 子图片的高，为负值时表示鼠标向起点的上方拖动

	 * @return BufferedImage

	 */

	public BufferedImage getImg(int x,int y,int w,int h)

	{

		//跟据w  h的正负，判断子图的起点与宽高

		if(w>0&&h>0)

		{

			return img.getSubimage(x, y, w, h);

		}

		else

		{

			if(w>0&&h<0)

			{

				return img.getSubimage(x, y+h, w, -h);

			}

			else

			{

				if(w<0&&h>0)

				{

					return img.getSubimage(x+w, y, -w, h);

				}

				else

				{

					return img.getSubimage(x+w, y+h, -w, -h);

				}

			}

		}

	}

	@Override

	public void paintComponent(Graphics g)

	{

		g.drawImage(img,0,0,null);

	}

}