JavaExercises/Experiments/RotatingCube.java at master · biblelamp/JavaExercises · GitHub

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// http://compgraphics.info/3D/3d_affine_transformations.php

// https://rosettacode.org/wiki/Draw_a_rotating_cube#Java

import java.awt.*;

import java.awt.event.ActionEvent;

import static java.lang.Math.*;

import javax.swing.*;

public class RotatingCube extends JPanel {

double[][] nodes = {{-1, -1, -1}, {-1, -1, 1}, {-1, 1, -1}, {-1, 1, 1},

{1, -1, -1}, {1, -1, 1}, {1, 1, -1}, {1, 1, 1}};

int[][] edges = {{0, 1}, {1, 3}, {3, 2}, {2, 0}, {4, 5}, {5, 7}, {7, 6},

{6, 4}, {0, 4}, {1, 5}, {2, 6}, {3, 7}};

public RotatingCube() {

setPreferredSize(new Dimension(640, 640));

setBackground(Color.white);

scale(100);

rotateCube(PI / 4, atan(sqrt(2)));

new Timer(17, (ActionEvent e) -> {

rotateCube(PI / 180, 0);

repaint();

}).start();

}

final void scale(double s) {

for (double[] node : nodes) {

node[0] *= s;

node[1] *= s;

node[2] *= s;

}

final void rotateCube(double angleX, double angleY) {

double sinX = sin(angleX);

double cosX = cos(angleX);

double sinY = sin(angleY);

double cosY = cos(angleY);

for (double[] node : nodes) {

double x = node[0];

double y = node[1];

double z = node[2];

node[0] = x * cosX - z * sinX;

node[2] = z * cosX + x * sinX;

z = node[2];

node[1] = y * cosY - z * sinY;

node[2] = z * cosY + y * sinY;

}

void drawCube(Graphics2D g) {

g.translate(getWidth() / 2, getHeight() / 2);

for (int[] edge : edges) {

double[] xy1 = nodes[edge[0]];

double[] xy2 = nodes[edge[1]];

g.drawLine((int) round(xy1[0]), (int) round(xy1[1]),

(int) round(xy2[0]), (int) round(xy2[1]));

}

for (double[] node : nodes)

g.fillOval((int) round(node[0]) - 4, (int) round(node[1]) - 4, 8, 8);

}

@Override

public void paintComponent(Graphics gg) {

super.paintComponent(gg);

Graphics2D g = (Graphics2D) gg;

g.setRenderingHint(RenderingHints.KEY_ANTIALIASING,

RenderingHints.VALUE_ANTIALIAS_ON);

drawCube(g);

}

public static void main(String[] args) {

SwingUtilities.invokeLater(() -> {

JFrame f = new JFrame();

f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

f.setTitle("Rotating Cube");

f.setResizable(false);

f.add(new RotatingCube(), BorderLayout.CENTER);

f.pack();

f.setLocationRelativeTo(null);

f.setVisible(true);

});

}

JavaExercises/Experiments/RotatingCube.java at master · biblelamp/JavaExercises · GitHub

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