java2d图像缩放特效
时间:2011-06-12 BlogJava zht
效果图如下：
源代码：
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class Scale {
/**
* @param args
*/
public static void main(String[] args) {
JFrame jf = new JFrame();
jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
jf.getContentPane().add(new ScalePanel());
jf.setPreferredSize(new Dimension(500, 400));
jf.pack();
jf.setVisible(true);
}
}
class ScalePanel extends JPanel {
protected void paintComponent(Graphics g) {
int width = this.getWidth();
int height = this.getHeight();
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g;
g2d.setColor(Color.WHITE);
g2d.fillRect(0, 0, width, height);
g2d.setColor(Color.BLACK);
g2d.setRenderingHint(RenderingHints.KEY_FRACTIONALMETRICS,
RenderingHints.VALUE_FRACTIONALMETRICS_ON);
g2d.setRenderingHint(RenderingHints.KEY_RENDERING,
RenderingHints.VALUE_RENDER_QUALITY);
ImageIcon logoPNG;
try {
logoPNG = new ImageIcon(getClass().getResource ("logo.png"));
logoPNG.paintIcon(this, g2d, 10, 50);
g2d.translate(width / 5, height / 2.5);
g2d.scale(2.0, 2.0);//放大2倍
logoPNG.paintIcon(this, g2d, 0, 0);
g2d.scale(0.25, 0.25);//缩小到1/4
logoPNG.paintIcon(this, g2d, 250, -180);
} catch (Exception e) {
e.printStackTrace();
g2d.drawString("读入图像文件错误！", 100, 200);
}
}
}
以上代码修改一下即可用在jsp中 |
