第6周作业-图像缩放显示
2014-04-08 22:37
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1:程序练手。教材P201 例9-13 缩放显示图像,类名:ShowImg。
然后尝试把Applet改写为Application,即含有main主方法的应用程序,
类似于P199 例9-12;
其结果显示如图:
把Applet改写为Application,即含有main主方法的应用程序,类似于P199 例9-12;
其运行结果如图:
然后尝试把Applet改写为Application,即含有main主方法的应用程序,
类似于P199 例9-12;
import java.awt.*; import javax.swing.*; public class ShowImg extends JApplet { Image img1; public void init() { img1=getImage(getCodeBase(),"e176.gif");//图片要放在BIN文件里,和CLASS放在同一个文件中 } public void paint(Graphics g) { int w=img1.getWidth(this); int h=img1.getHeight(this); g.drawImage(img1,5,10,this); g.drawImage(img1, 150, 40, w/2, h/2, this); g.drawImage(img1, 5, 100, w*2, h*2, this); } }
其结果显示如图:
把Applet改写为Application,即含有main主方法的应用程序,类似于P199 例9-12;
import java.awt.*; import javax.swing.*; public class ShowImgApp{ public static void main(String args[]) { ImageFrame frame=new ImageFrame(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.show(); } } class ImageFrame extends JFrame { public ImageFrame() { setTitle("ImageShow"); setSize(WIDTH,HEIGHT); ImagePanel panel=new ImagePanel(); Container contenPane=getContentPane(); contenPane.add(panel); } public static final int WIDTH=300; public static final int HEIGHT=200; } class ImagePanel extends JPanel { public ImagePanel() { image=Toolkit.getDefaultToolkit().getImage("e176.gif"); MediaTracker tracker=new MediaTracker(this); tracker.addImage(image,1); try { tracker.waitForID(1); } catch(InterruptedException exception){} } public void paintComponent(Graphics g) { super.paintComponent(g); int imageWidth=image.getWidth(this); int imageHeight=image.getHeight(this); g.drawImage(image,5,10,this); g.drawImage(image, 150, 40, imageWidth/2, imageHeight/2, this); g.drawImage(image, 5, 100, imageWidth*2, imageHeight*2, this); int FrameWidth=getWidth(); int FrameHeight=getHeight(); } private Image image; }
其运行结果如图: