java放大鏡源程序

1、/*用java語言編寫，在JCeator中運行成功*這是一個放大鏡的程序，運行后拖動屏幕左上角的方框，即可以看到放大效果 *放大鏡的原理：光的折射*/import java.awt.*;import java.awt.eve nt.*;import javax.swi ng.*;public class Magni fier exte nds JFrame private Container container = getC onten tPa ne();private int setCoord in ateX;private int setCoord in ateY;private int

2、absoluteCoord in ateX;private int absoluteCoord in ateY;private int relativeCoord in ateXWhe nM ousePressed;private int relativeCoord in ateYWhe nM ousePressed;private boolea n mousePressedNow;private in t mag ni fierSize = 100;private Magni fierPa nel magni fierPa nel = new Magni fierPa nel(mag ni

3、fierSize); public Mag ni fier() set Un decorated(true);setResizable(false);con tai ner.add(mag nifierPa nel);addMouseListe ner(new MouseF unction s();addMouseMoti on Liste ner(new MouseMoti onFunction s();updateSize(mag ni fierSize);this.setVisible(true);public static void main(String arg) Magnifier

4、 magnifier = new Magnifier(); magnifier.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 publi

5、c void mousePressed(MouseEvent e) if (e.getClickCount() = 1) / 如果鼠標左鍵點了一下，說明按住了窗體 mousePressedNow = true; relativeCoordinateXWhenMousePressed = e.getX(); relativeCoordinateYWhenMousePressed = e.getY(); public void mouseReleased(MouseEvent e) mousePressedNow = false;private class MouseMotionFunctions

6、 extends MouseMotionAdapter public void mouseDragged(MouseEvent e) if (mousePressedNow = true) / 如果此時鼠標按下了，說明在拖拽窗體 absoluteCoordinateX = Magnifier.this.getLocationOnScreen().x + e.getX();absoluteCoordinateY = Magnifier.this.getLocationOnScreen().y+ e.getY(); setCoordinateX = absoluteCoordinateX- rel

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

8、fierSize;private int locationX;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

9、().getScreenSize().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, / 目標矩形的第一個角的 x 坐標0, / 目標矩形的第一個角的 y 坐標 magnifierSize, / 目標矩形的第二個角的 x 坐標 magnifierSize, / 目標矩形的第二個角的 y 坐標 locationX + (magnifierSize / 4), / 源矩形的第一個角的 x 坐標 locationY