java放大镜源程序#优质参考

1、/*用java语言编写，在JCeator中运行成功 *这是一个放大镜的程序，运行后拖动屏幕左上角的方框，即可以看到放大效果 *放大镜的原理：光的折射*/import java.awt.*; import java.awt.event.*; import javax.swing.*; public class Magnifier extends JFrame private Container container = getContentPane(); private int setCoordinateX; private int setCoordinateY; private int abso

2、luteCoordinateX; private int absoluteCoordinateY; private int relativeCoordinateXWhenMousePressed; private int relativeCoordinateYWhenMousePressed; private boolean mousePressedNow; private int magnifierSize = 100; private MagnifierPanel magnifierPanel = new MagnifierPanel(magnifierSize); public Magn

3、ifier() setUndecorated(true); setResizable(false); container.add(magnifierPanel); addMouseListener(new MouseFunctions(); addMouseMotionListener(new MouseMotionFunctions(); updateSize(magnifierSize); this.setVisible(true); public static void main(String arg) Magnifier magnifier = new Magnifier(); mag

4、nifier.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); public void updateSize(int magnifierSize) magnifierPanel.setMagnifierSize(magnifierSize + 100); setSize(magnifierSize + 100, magnifierSize + 100); validate(); private class MouseFunctions extends MouseAdapter public void mousePressed(MouseEvent

5、e) if (e.getClickCount() = 1) / 如果鼠标左键点了一下，说明按住了窗体 mousePressedNow = true; relativeCoordinateXWhenMousePressed = e.getX(); relativeCoordinateYWhenMousePressed = e.getY(); public void mouseReleased(MouseEvent e) mousePressedNow = false; private class MouseMotionFunctions extends MouseMotionAdapter pu

6、blic void mouseDragged(MouseEvent e) if (mousePressedNow = true) / 如果此时鼠标按下了，说明在拖拽窗体 absoluteCoordinateX = Magnifier.this.getLocationOnScreen().x + e.getX(); absoluteCoordinateY = Magnifier.this.getLocationOnScreen().y + e.getY(); setCoordinateX = absoluteCoordinateX - relativeCoordinateXWhenMousePr

7、essed; setCoordinateY = absoluteCoordinateY - relativeCoordinateYWhenMousePressed; magnifierPanel.setMagnifierLocation(setCoordinateX, setCoordinateY); setLocation(setCoordinateX, setCoordinateY); class MagnifierPanel extends JPanel private Image screenImage; private int magnifierSize; private int l

8、ocationX; private int locationY; private Robot robot; public MagnifierPanel(int magnifierSize) try robot = new Robot(); catch (AWTException e) screenImage = robot.createScreenCapture(new Rectangle(0, 0, Toolkit .getDefaultToolkit().getScreenSize().width, Toolkit .getDefaultToolkit().getScreenSize().

9、height); this.magnifierSize = magnifierSize; public void setMagnifierLocation(int locationX, int locationY) this.locationX = locationX; this.locationY = locationY; repaint(); public void setMagnifierSize(int magnifierSize) this.magnifierSize = magnifierSize; public void paintComponent(Graphics g) super.paintComponent(Graphics2D) g); g.drawImage(screenImage, 0, / 目标矩形的第一个角的x坐标 0, / 目标矩形的第一个角的y坐标 magnifierSize, / 目标矩形的第二个角的x坐标 magnifierSize, / 目标矩形的第二个角的y坐标 locationX + (magnifierSize / 4), / 源矩形的第一个角的x坐标 locationY +