javaswinggraphicsjpanelcube
How to create a cube in swing?
I am trying to make a class that when invoked by a JPanel, creates a cube. What I have seen though, is something called a ColorCube, which requires a "Universe" of some sort, and a Canvas, though I didn't find this method to be compatible with JPanel.
TO clarify, I am not asking how to create a custom JComponent(exactly), nor am I asking how to add color or rotate it, just how to create a class that when invoked by a JPanel renders a cube to the screen.
Solution
All you really need are x, y, and size passed to the Cube class, then
Take those arguments and build an array of corners points for a first square and also corner points for a second shifted square. See methods
getCubeOnePointsandgetCubeTwoPointsmethods in theCubeclass.Draw the first square. Draw the second square, and connect the points from the point arrays. See the
drawCubemethod in theCubeclass.Create an instance of the
Cubeclass passing necessary arguments, and draw the cube. SeeCubePanelconstructor andpaintComponentmethod
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Point;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
public class CubePanel extends JPanel{
private static final int D_W = 400;
private static final int D_H = 400;
Cube cube;
public CubePanel() {
cube = new Cube(75, 75, 200, 50);
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
cube.drawCube(g);
}
@Override
public Dimension getPreferredSize() {
return new Dimension(D_W, D_H);
}
public class Cube {
int x, y, size, shift;
Point[] cubeOnePoints;
Point[] cubeTwoPoints;
public Cube(int x, int y, int size, int shift) {
this.x = x;
this.y = y;
this.size = size;
this.shift = shift;
cubeOnePoints = getCubeOnePoints();
cubeTwoPoints = getCubeTwoPoints();
}
private Point[] getCubeOnePoints() {
Point[] points = new Point[4];
points[0] = new Point(x, y);
points[1] = new Point(x + size, y);
points[2] = new Point(x + size, y + size);
points[3] = new Point(x, y + size);
return points;
}
private Point[] getCubeTwoPoints() {
int newX = x + shift;
int newY = y + shift;
Point[] points = new Point[4];
points[0] = new Point(newX, newY);
points[1] = new Point(newX + size, newY);
points[2] = new Point(newX + size, newY + size);
points[3] = new Point(newX, newY + size);
return points;
}
public void drawCube(Graphics g) {
g.drawRect(x, y, size, size);
g.drawRect(x + shift, y + shift, size, size);
// draw connecting lines
for (int i = 0; i < 4; i++) {
g.drawLine(cubeOnePoints[i].x, cubeOnePoints[i].y,
cubeTwoPoints[i].x, cubeTwoPoints[i].y);
}
}
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
JFrame frame = new JFrame();
frame.add(new CubePanel());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
}
UPDATE
"what if i wanted this in a 3d where the cube could be walked around "
Just create methods to shift all the xs or ys and call it, then repaint. The method could look something like
public void shiftLeft() {
x -= SHIFT_INC;
for (Point p : cubeOnePoints) {
p.x -= SHIFT_INC;
}
for (Point p : cubeTwoPoints) {
p.x -= SHIFT_INC;
}
}
In the example below, I just call it in a key bind with the ←key.
im.put(KeyStroke.getKeyStroke("LEFT"), "shiftLeft");
getActionMap().put("shiftLeft", new AbstractAction(){
public void actionPerformed(ActionEvent e) {
cube.shiftLeft();
repaint();
}
});
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Point;
import java.awt.event.ActionEvent;
import javax.swing.AbstractAction;
import javax.swing.InputMap;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.KeyStroke;
import javax.swing.SwingUtilities;
public class CubePanel extends JPanel{
private static final int D_W = 400;
private static final int D_H = 300;
Cube cube;
public CubePanel() {
cube = new Cube(75, 75, 50, 15);
InputMap im = getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW);
im.put(KeyStroke.getKeyStroke("RIGHT"), "shiftRight");
getActionMap().put("shiftRight", new AbstractAction(){
public void actionPerformed(ActionEvent e) {
cube.shiftRight();
repaint();
}
});
im.put(KeyStroke.getKeyStroke("LEFT"), "shiftLeft");
getActionMap().put("shiftLeft", new AbstractAction(){
public void actionPerformed(ActionEvent e) {
cube.shiftLeft();
repaint();
}
});
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
cube.drawCube(g);
}
@Override
public Dimension getPreferredSize() {
return new Dimension(D_W, D_H);
}
public class Cube {
private static final int SHIFT_INC = 5;
int x, y, size, shift;
Point[] cubeOnePoints;
Point[] cubeTwoPoints;
public Cube(int x, int y, int size, int shift) {
this.x = x;
this.y = y;
this.size = size;
this.shift = shift;
cubeOnePoints = getCubeOnePoints();
cubeTwoPoints = getCubeTwoPoints();
}
private Point[] getCubeOnePoints() {
Point[] points = new Point[4];
points[0] = new Point(x, y);
points[1] = new Point(x + size, y);
points[2] = new Point(x + size, y + size);
points[3] = new Point(x, y + size);
return points;
}
private Point[] getCubeTwoPoints() {
int newX = x + shift;
int newY = y + shift;
Point[] points = new Point[4];
points[0] = new Point(newX, newY);
points[1] = new Point(newX + size, newY);
points[2] = new Point(newX + size, newY + size);
points[3] = new Point(newX, newY + size);
return points;
}
public void shiftLeft() {
x -= SHIFT_INC;
for (Point p : cubeOnePoints) {
p.x -= SHIFT_INC;
}
for (Point p : cubeTwoPoints) {
p.x -= SHIFT_INC;
}
}
public void shiftRight() {
x += SHIFT_INC;
for (Point p : cubeOnePoints) {
p.x += SHIFT_INC;
}
for (Point p : cubeTwoPoints) {
p.x += SHIFT_INC;
}
}
public void drawCube(Graphics g) {
g.drawRect(x, y, size, size);
g.drawRect(x + shift, y + shift, size, size);
// draw connecting lines
for (int i = 0; i < 4; i++) {
g.drawLine(cubeOnePoints[i].x, cubeOnePoints[i].y,
cubeTwoPoints[i].x, cubeTwoPoints[i].y);
}
}
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
JFrame frame = new JFrame();
frame.add(new CubePanel());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
}
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