Main.java Source code

Introduction

Here is the source code for Main.java

Source

import java.awt.Graphics2D;
import java.awt.GraphicsConfiguration;
import java.awt.GraphicsDevice;
import java.awt.GraphicsEnvironment;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.net.URL;

import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;

public class Main {
    public static void main(String[] args) throws IOException {
        BufferedImage original = ImageIO.read(new URL("http://www.java2s.com/style/download.png"));

        GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
        GraphicsDevice gd = ge.getDefaultScreenDevice();
        GraphicsConfiguration gc = gd.getDefaultConfiguration();

        BufferedImage rotated1 = create(original, -Math.PI / 2, gc);
        BufferedImage rotated2 = create(original, +Math.PI / 4, gc);
        BufferedImage rotated3 = create(original, Math.PI, gc);

        JPanel cp = new JPanel();
        cp.add(new JLabel(new ImageIcon(original)));
        cp.add(new JLabel(new ImageIcon(rotated1)));
        cp.add(new JLabel(new ImageIcon(rotated2)));
        cp.add(new JLabel(new ImageIcon(rotated3)));

        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setContentPane(cp);
        f.pack();
        f.setVisible(true);

    }

    public static BufferedImage create(BufferedImage image, double angle, GraphicsConfiguration gc) {
        double sin = Math.abs(Math.sin(angle)), cos = Math.abs(Math.cos(angle));
        int w = image.getWidth(), h = image.getHeight();
        int neww = (int) Math.floor(w * cos + h * sin), newh = (int) Math.floor(h * cos + w * sin);
        int transparency = image.getColorModel().getTransparency();
        BufferedImage result = gc.createCompatibleImage(neww, newh, transparency);
        Graphics2D g = result.createGraphics();
        g.translate((neww - w) / 2, (newh - h) / 2);
        g.rotate(angle, w / 2, h / 2);
        g.drawRenderedImage(image, null);
        return result;
    }
}