Wheel spinning in Java using Swing and Graphics2D?

Question

Wheel spinning in Java using Swing and Graphics2D?

I am working on a class that can rotate the wheel around the center. The wheel is created using graphics2d, but I can’t determine exactly how to make the wheel rotate around the center. The wheel is currently spinning, but not exactly about the origin.

My ultimate goal here is to create a wheel so that it is multicolored, as well as a program around it, but my main task here is to make the spinning wheel work. If you could point me in the right direction, I would be forever grateful!

Here is my current code:

import java.awt.*;
import java.awt.event.*;
import java.awt.geom.Ellipse2D;
import java.awt.geom.Line2D;
import java.awt.image.BufferedImage;
import java.util.Random;
import javax.swing.*;


public class RotateApp {

private static final int N = 3;

public static void main(String[] args) {
    EventQueue.invokeLater(new Runnable() {

        public void run() {
            JFrame frame = new JFrame();
            frame.setLayout(new GridLayout(N, N, N, N));
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            frame.add(new RotatePanel());
            frame.pack();
            frame.setVisible(true);
            System.out.println();
        }
    });
}
}


class RotatePanel extends JPanel implements ActionListener {

private static final int SIZE = 256;
private static double DELTA_THETA = Math.PI / 90;
private final Timer timer = new Timer(25, this);
private Image image = RotatableImage.getImage(SIZE);
private double dt = DELTA_THETA;
private double theta;

public RotatePanel() {
    this.setBackground(Color.lightGray);
    this.setPreferredSize(new Dimension(
        image.getWidth(null), image.getHeight(null)));
    this.addMouseListener(new MouseAdapter() {

        @Override
        public void mousePressed(MouseEvent e) {
            image = RotatableImage.getImage(SIZE);
            dt = -dt;
        }
    });
    timer.start();
}


public void paintComponent(Graphics g) {
    super.paintComponent(g);
    Graphics2D g2d = (Graphics2D) g;
    g2d.translate(this.getWidth() / 2, this.getHeight() / 2);
    g2d.rotate(theta);
    g2d.translate(-image.getWidth(this) / 2, -image.getHeight(this) / 2);
    g2d.drawImage(image, 0, 0, null);
}

public void actionPerformed(ActionEvent e) {
    theta += dt;
    repaint();
}

@Override
public Dimension getPreferredSize() {
    return new Dimension(SIZE, SIZE);
}

}

class RotatableImage {

private static final Random r = new Random();

static public Image getImage(int size) {
    BufferedImage bi = new BufferedImage(
        size, size, BufferedImage.TYPE_INT_ARGB);
    Graphics2D g2d = bi.createGraphics();
    g2d.setRenderingHint(
        RenderingHints.KEY_ANTIALIASING,
        RenderingHints.VALUE_ANTIALIAS_ON);
    g2d.setPaint(Color.getHSBColor(r.nextFloat(), 1, 1));
    g2d.setStroke(new BasicStroke(10.0f));
    g2d.draw(new Line2D.Double(0, 100, 100, 100));
    g2d.draw(new Line2D.Double(100, 100, 200, 100));

    g2d.draw(new Line2D.Double(100, 0, 100, 100));
    g2d.draw(new Line2D.Double(100, 100, 100, 200));

    g2d.draw(new Line2D.Double(25, 25, 100, 100));
    g2d.draw(new Line2D.Double(100, 100, 175, 175));

    g2d.draw(new Line2D.Double(175, 25, 100, 100));
    g2d.draw(new Line2D.Double(100, 100, 25, 175));

    g2d.draw(new Ellipse2D.Double(0, 0, 200, 200));
    g2d.dispose();
    return bi;
}
}

+4

java rotation swing

Seth allen Apr 16 '15 at 23:10

source share

2 answers

camickr · Answer 1 · 2015-04-17T02:13:17+0000

Rotated Icon, , .

:

import java.awt.*;
import java.awt.geom.*;
import java.awt.image.*;
import java.util.*;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.*;
import javax.swing.event.*;

public class Rotation4 extends JPanel
{
    private JLabel label;
    private Icon icon;
    private Icon rotated;
    private int degrees;

    public Rotation4(Image image)
    {
        icon = new ImageIcon( image );
        label = new JLabel(icon);
        label.setPreferredSize( label.getPreferredSize() );
        add( label );
        setDegrees( 0 );
    }

    public void setDegrees(int degrees)
    {
        this.degrees = degrees;
        double radians = Math.toRadians( degrees );
        rotated = new RotatedIcon(icon, degrees);
        label.setIcon(rotated);
    }

    public static void main(String[] args)
    {
        EventQueue.invokeLater(new Runnable()
        {
            public void run()
            {
                Image bi = RotatableImage.getImage(210);
                final Rotation4 r = new Rotation4(bi);

                    final JSlider slider = new JSlider(JSlider.HORIZONTAL, 0, 360, 0);
                    slider.addChangeListener(new ChangeListener()
                    {
                        public void stateChanged(ChangeEvent e)
                        {
                            int value = slider.getValue();
                            r.setDegrees( value );
                        }
                    });

                JFrame f = new JFrame();
                f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                f.add(new JScrollPane(r));
                f.add(slider, BorderLayout.SOUTH);
                f.pack();
                f.setLocationRelativeTo(null);
                f.setVisible(true);
            }
        });
    }

    static class RotatableImage
    {
        private static final Random r = new Random();

        static public Image getImage(int size)
        {
            BufferedImage bi = new BufferedImage(size, size, BufferedImage.TYPE_INT_ARGB);
            Graphics2D g2d = bi.createGraphics();
            g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
            g2d.setPaint(Color.getHSBColor(r.nextFloat(), 1, 1));
            g2d.setStroke(new BasicStroke(10.0f));

            g2d.draw(new Line2D.Double(5, 105, 205, 105));
/*
            g2d.draw(new Line2D.Double(100, 100, 200, 100));

            g2d.draw(new Line2D.Double(100, 0, 100, 100));
            g2d.draw(new Line2D.Double(100, 100, 100, 200));

            g2d.draw(new Line2D.Double(25, 25, 100, 100));
            g2d.draw(new Line2D.Double(100, 100, 175, 175));

            g2d.draw(new Line2D.Double(175, 25, 100, 100));
            g2d.draw(new Line2D.Double(100, 100, 25, 175));
*/
            g2d.draw(new Ellipse2D.Double(5, 5, 199, 199));

            g2d.setColor(Color.BLACK);
            g2d.fillOval(100, 100, 10, 10);

            g2d.dispose();
            return bi;
        }
    }
}

. . , RotatedIcon :

210. , 10, .
. (5, 5).
199. , . 1 . 200, 1 . 10, 1, .
. , , , . 5 5 .

xerx593 · Answer 2 · 2015-04-17T00:17:51+0000

, "", (1.) (2):

UPDATE 1.) () , SIZE 200!

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridLayout;
import java.awt.Image;
import java.awt.RenderingHints;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.geom.Ellipse2D;
import java.awt.geom.Line2D;
import java.awt.image.BufferedImage;
import java.util.Random;
import javax.swing.*;

public class RotateApp {

    private static final int N = 3;

    public static void main(String[] args) {
        EventQueue.invokeLater(() -> {
            JFrame frame = new JFrame();
            frame.setLayout(new GridLayout(N, N, N, N));
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            frame.add(new RotatePanel());
            frame.pack();
            frame.setVisible(true);
            System.out.println();
        });
    }
}

class RotatePanel extends JPanel implements ActionListener {

    private static final int SIZE = 256;
    private static final double DELTA_THETA = Math.PI / 90;
    private final Timer timer = new Timer(25, this);
    private Image image = RotatableImage.getImage(SIZE);
    private double dt = DELTA_THETA;
    private double theta;

    public RotatePanel() {
        this.setBackground(Color.lightGray);
        this.setPreferredSize(new Dimension(SIZE, SIZE));
        this.addMouseListener(new MouseAdapter() {

            @Override
            public void mousePressed(MouseEvent e) {
                dt = -dt;
                image = RotatableImage.getImage(SIZE);
            }
        });
        timer.start();
    }

    @Override
    public void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2d = (Graphics2D) g;
        g2d.rotate(theta,128,128);
        g2d.drawImage(image, 0, 0, null);
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        theta += dt;
        repaint();
    }

    @Override
    public Dimension getPreferredSize() {
        return new Dimension(SIZE, SIZE);
    }

}

class RotatableImage {

    private static final Random r = new Random();

    static public Image getImage(int size) {
        BufferedImage bi = new BufferedImage(
                size, size, BufferedImage.TYPE_INT_ARGB);
        Graphics2D g2d = bi.createGraphics();
        g2d.setRenderingHint(
                RenderingHints.KEY_ANTIALIASING,
                RenderingHints.VALUE_ANTIALIAS_ON);
        final Color c1 = Color.getHSBColor(r.nextFloat(), 1, 1);
        final Color c2 = Color.getHSBColor(r.nextFloat(), 1, 1);
        g2d.setPaint(c1);
        g2d.setStroke(new BasicStroke(10.0f));
        g2d.draw(new Line2D.Double(0, size/2, size, size/2));

        g2d.setPaint(c2);
        g2d.draw(new Line2D.Double(size/2, 0, size/2, size));

        g2d.setPaint(c1);
        g2d.draw(new Ellipse2D.Double(0, 0, size, size));
        g2d.dispose();
        return bi;
    }
}

:

, "" , / 256x256, "" 200x200. , g2d.rotate(theta,128,128); (!) .
(): setPaint() !;)

Wheel spinning in Java using Swing and Graphics2D?

More articles: