// This demonstrates 2-sided lighting. The front and back // of the spinning rectangle are given different // material properties. import java.awt.BorderLayout; import java.awt.Frame; import java.awt.GridLayout; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import javax.media.opengl.*; import javax.media.opengl.glu.*; import javax.media.opengl.awt.GLCanvas; import com.jogamp.opengl.util.*; import java.awt.*; import javax.swing.*; import java.awt.event.*; import javax.swing.event.*; public class SpinningRectangle implements GLEventListener, ActionListener, ChangeListener { public static void main(String[] args) { new SpinningRectangle(); } private int INTITIAL_WIDTH=800; private int INITIAL_HEIGHT=800; JButton quitButton; private GLCanvas canvas; private GL2 gl; private GLU glu; private JSlider xSlider, ySlider, zSlider; private float ambient[] = {0.3f, 0f, 0f, 1f}; private float specular[] = {0.9f, 0.9f, 0.9f, 1f}; private float shininess = 64f; private float redPlasticDiffuse[] = {0.9f, 0f, 0f, 1f}; private float greenPlasticDiffuse[] = {0f, 0.9f, 0f, 1f}; private float lightAmbient[] = {0f, 0f, 0f, 1f}; private float lightDiffuse[] = {1f, 1f, 1f, 1f}; private float lightSpecular[] = {1f, 1f, 1f, 1f}; private float lightPosition[] = {30f, 10f, 10f, 1f}; // The viewer is at (2, 0, 0); this doesn't change. private float viewerX = 50f; private float viewerY = 0f; private float viewerZ = 0f; private float theta = 60; public SpinningRectangle() { GLProfile glp=GLProfile.getDefault(); GLCapabilities caps = new GLCapabilities(glp); canvas = new GLCanvas(caps); JFrame frame = new JFrame("SPINNING RECTANGLE"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE ); frame.setSize(800, 800); frame.setLayout(new BorderLayout()); JPanel north = new JPanel( new BorderLayout()); JPanel topRow = new JPanel( new FlowLayout(FlowLayout.LEADING)); quitButton = new JButton( "Quit"); quitButton.addActionListener(this); topRow.add(quitButton); north.add(topRow, BorderLayout.NORTH); JPanel south = new JPanel(new GridLayout(3, 1)); JPanel secondRow = new JPanel(new BorderLayout()); JPanel thirdRow = new JPanel( new BorderLayout()); JPanel fourthRow = new JPanel( new BorderLayout() ); xSlider = new JSlider(-100, 100); xSlider.setValue((int)(lightPosition[0])); xSlider.setMajorTickSpacing(20); xSlider.setPaintTicks(true); xSlider.setPaintLabels(true); xSlider.addChangeListener(this); JLabel xSliderName = new JLabel(" Light X"); secondRow.add(xSliderName, BorderLayout.WEST); secondRow.add(xSlider, BorderLayout.CENTER); south.add(secondRow); ySlider = new JSlider(-100, 100); ySlider.setValue((int)(lightPosition[1])); ySlider.setMajorTickSpacing(20); ySlider.setPaintTicks(true); ySlider.setPaintLabels(true); ySlider.addChangeListener(this); JLabel ySliderName = new JLabel(" Light Y"); thirdRow.add(ySliderName, BorderLayout.WEST); thirdRow.add(ySlider, BorderLayout.CENTER); south.add(thirdRow); zSlider = new JSlider(-100, 100); zSlider.setValue((int)(lightPosition[2])); zSlider.setMajorTickSpacing(20); zSlider.setPaintTicks(true); zSlider.setPaintLabels(true); zSlider.addChangeListener(this); JLabel zSliderName = new JLabel(" Light Z"); fourthRow.add(zSliderName, BorderLayout.WEST); fourthRow.add(zSlider, BorderLayout.CENTER); south.add(fourthRow); north.add(south, BorderLayout.SOUTH); frame.add(north, BorderLayout.NORTH); JPanel myCanvas = new JPanel(new GridLayout(1,1)); myCanvas.add(canvas); frame.add(myCanvas, BorderLayout.CENTER); frame.setVisible(true); canvas.addGLEventListener(this); FPSAnimator animator = new FPSAnimator(canvas, 60); animator.start(); } public void actionPerformed(ActionEvent event) { if (event.getSource() == quitButton) System.exit(0); } public void stateChanged(ChangeEvent e) { if (e.getSource() == xSlider) { lightPosition[0] = xSlider.getValue(); } else if (e.getSource() == ySlider) { lightPosition[1] = ySlider.getValue(); } else if (e.getSource() == zSlider) { lightPosition[2] = zSlider.getValue(); } } public void display(GLAutoDrawable drawable) { update(); render(drawable); } private void update() { theta += 1; } private void render(GLAutoDrawable drawable) { int Divisions = 20; gl.glClear(GL2.GL_COLOR_BUFFER_BIT | GL2.GL_DEPTH_BUFFER_BIT); gl.glLightfv(GL2.GL_LIGHT0, GL2.GL_POSITION, lightPosition, 0); gl.glPushMatrix(); gl.glRotatef(theta, 0f, 1f, 0f); square( Divisions ); gl.glPopMatrix(); } // This makes a square that is 20 units on each side; // it is divided into divisionsxdivisions subsquares private void square(int divisions) { float left = -10f; float right = 10f; float top = -10f; float bottom = 10f; float delta = 20f/divisions; gl.glNormal3f(1f, 0f, 0f); for (float y = left; y < right; y += delta) { for (float z = top; z < bottom; z += delta) { gl.glBegin(GL2.GL_POLYGON); gl.glVertex3f(0f, y, z); gl.glVertex3f(0f, y+delta, z); gl.glVertex3f(0f, y+delta, z+delta); gl.glVertex3f(0f, y, z+delta); gl.glEnd(); } } } public void dispose(GLAutoDrawable drawable) { // put the cleanup code here } public void init(GLAutoDrawable drawable) { gl = drawable.getGL().getGL2(); glu = new GLU(); gl.glEnable(GL2.GL_DEPTH_TEST); gl.glEnable(GL2.GL_LIGHTING); gl.glLightModelf(GL2.GL_LIGHT_MODEL_TWO_SIDE, GL2.GL_TRUE); gl.glEnable(GL2.GL_LIGHT0); gl.glMatrixMode(GL2.GL_PROJECTION); gl.glLoadIdentity(); glu.gluPerspective(60f, 1f, 0.5f, 200f); gl.glMatrixMode(GL2.GL_MODELVIEW); gl.glLoadIdentity(); glu.gluLookAt(viewerX, viewerY, viewerZ, 0f, 0f, 0f, 0f, 0f, 1f); gl.glClearColor(1, 1, 1, 1); gl.glClear(GL2.GL_COLOR_BUFFER_BIT | GL2.GL_DEPTH_BUFFER_BIT); gl.glLightfv(GL2.GL_LIGHT0, GL2.GL_AMBIENT, lightAmbient, 0); gl.glLightfv(GL2.GL_LIGHT0, GL2.GL_DIFFUSE, lightDiffuse, 0); gl.glLightfv(GL2.GL_LIGHT0, GL2.GL_SPECULAR, lightSpecular, 0); gl.glLightfv(GL2.GL_LIGHT0, GL2.GL_POSITION, lightPosition, 0); gl.glMaterialfv(GL2.GL_FRONT, GL2.GL_AMBIENT, ambient, 0); gl.glMaterialfv(GL2.GL_FRONT, GL2.GL_DIFFUSE, redPlasticDiffuse, 0); gl.glMaterialfv(GL2.GL_FRONT, GL2.GL_SPECULAR, specular, 0); gl.glMaterialf(GL2.GL_FRONT, GL2.GL_SHININESS, shininess); gl.glMaterialfv(GL2.GL_BACK, GL2.GL_AMBIENT, ambient, 0); gl.glMaterialfv(GL2.GL_BACK, GL2.GL_DIFFUSE, greenPlasticDiffuse, 0); gl.glMaterialfv(GL2.GL_BACK, GL2.GL_SPECULAR, specular, 0); gl.glMaterialf(GL2.GL_BACK, GL2.GL_SHININESS, shininess); } public void reshape(GLAutoDrawable drawable, int x, int y, int width, int height) { // this is called when the window is resized gl.glViewport(0, 0, width, height); float aspect = width*1.0f/height; gl.glMatrixMode(GL2.GL_PROJECTION); gl.glLoadIdentity(); glu.gluPerspective(60f, aspect, 0.5f, 200f); gl.glMatrixMode(GL2.GL_MODELVIEW); } }