project 2 17
Below is a good start for project 2
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import com.jogamp.opengl.*;
import com.jogamp.opengl.awt.*;
/**
* Use JOGL to draw a simple cube
* with each face being a different color. Rotations
* can be applied with the arrow keys, the page up
* key, and the page down key. The home key will set
* all rotations to 0. Initial rotations about the
* x, y, and z axes are 15, -15, and 0.
*
* This program is meant as an example of using modeling
* transforms, with glPushMatrix and glPopMatrix.
*
* Note that this program does not use lighting.
*/
public class UnlitCube extends GLJPanel implements GLEventListener, KeyListener {
/**
* A main routine to create and show a window that contains a
* panel of type UnlitCube. The program ends when the
* user closes the window.
*/
public static void main(String[] args) {
JFrame window = new JFrame(“A Simple Unlit Cube — ARROW KEYS ROTATE”);
UnlitCube panel = new UnlitCube();
window.setContentPane(panel);
window.pack();
window.setLocation(50,50);
window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
window.setVisible(true);
panel.requestFocusInWindow();
}
/**
* Constructor for class UnlitCube.
*/
public UnlitCube() {
super( new GLCapabilities(null) ); // Makes a panel with default OpenGL “capabilities”.
setPreferredSize( new Dimension(500,500) );
addGLEventListener(this); // A listener is essential! The listener is where the OpenGL programming lives.
addKeyListener(this);
}
//——————– methods to draw the cube ———————-
double rotateX = 15; // rotations of the cube about the axes
double rotateY = -15;
double rotateZ = 0;
private void square(GL2 gl2, double r, double g, double b) {
gl2.glColor3d(r,g,b);
gl2.glBegin(GL2.GL_TRIANGLE_FAN);
gl2.glVertex3d(-0.5, -0.5, 0.5);
gl2.glVertex3d(0.5, -0.5, 0.5);
gl2.glVertex3d(0.5, 0.5, 0.5);
gl2.glVertex3d(-0.5, 0.5, 0.5);
gl2.glEnd();
}
private void cube(GL2 gl2, double size) {
gl2.glPushMatrix();
gl2.glScaled(size,size,size); // scale unit cube to desired size
// Move the squares to offset 3,3
gl2.glTranslated(3,3,0);
square(gl2,1, 0, 0); // red front face
gl2.glPushMatrix();
gl2.glRotated(90, 0, 1, 0);
square(gl2,0, 1, 0); // green right face
gl2.glPopMatrix();
gl2.glPushMatrix();
gl2.glRotated(-90, 1, 0, 0);
square(gl2,0, 0, 1); // blue top face
gl2.glPopMatrix();
gl2.glPushMatrix();
gl2.glRotated(180, 0, 1, 0);
square(gl2,0, 1, 1); // cyan back face
gl2.glPopMatrix();
gl2.glPushMatrix();
gl2.glRotated(-90, 0, 1, 0);
square(gl2,1, 0, 1); // magenta left face
gl2.glPopMatrix();
gl2.glPushMatrix();
gl2.glRotated(90, 1, 0, 0);
square(gl2,1, 1, 0); // yellow bottom face
gl2.glPopMatrix();
gl2.glPopMatrix(); // Restore matrix to its state before cube() was called.
}
//——————– GLEventListener Methods ————————-
/**
* The display method is called when the panel needs to be redrawn.
* The is where the code goes for drawing the image, using OpenGL commands.
*/
public void display(GLAutoDrawable drawable) {
GL2 gl2 = drawable.getGL().getGL2(); // The object that contains all the OpenGL methods.
gl2.glClear( GL2.GL_COLOR_BUFFER_BIT | GL2.GL_DEPTH_BUFFER_BIT );
gl2.glLoadIdentity(); // Set up modelview transform.
gl2.glRotated(rotateZ,0,0,1);
gl2.glRotated(rotateY,0,1,0);
gl2.glRotated(rotateX,1,0,0);
cube(gl2,1);
// Add an Index Face set
// Note using Graph paper is the best way to figure these vertices.
// You can make about any shape you want this way
double[][] vertexList =
{ {1,-0.5,1}, {1,-.5,-1}, {1,.5,-1}, {1,.5,1}, {.75,.75,0},
{-.75,.75,0}, {-1,-.5,1}, {-1,.5,1}, {-1,.5,-1}, {-1,-.5,-1} };
int[][] faceList =
{ {0,1,2,3}, {3,2,4}, {7,3,4,5}, {2,8,5,4}, {5,8,7},
{0,3,7,6}, {0,6,9,1}, {2,1,9,8}, {6,7,8,9} };
for (int i = 0; i < faceList.length; i++) {
gl2.glColor3f(1,0,1 ); // Set color for face number i.
gl2.glBegin(GL2.GL_TRIANGLE_FAN);
for (int j = 0; j < faceList[i].length; j++) {
int vertexNum = faceList[i][j]; // Index for vertex j of face i.
double[] vertexCoords = vertexList[vertexNum]; // The vertex itself.
gl2.glVertex3dv( vertexCoords, 0 );
}
gl2.glEnd();
// You can add more shapes here.
}
} // end display()
public void init(GLAutoDrawable drawable) {
// called when the panel is created
GL2 gl2 = drawable.getGL().getGL2();
gl2.glMatrixMode(GL2.GL_PROJECTION);
// gl2.glOrtho(-1, 1 ,-1, 1, -1, 1);
// Changing this is your coordinate -x,x,-y,y,-z,z)
// Larger numbers zooms out.
// Play with this to make sure you see your shapes.
gl2.glOrtho(-5, 5 ,-5, 5, -5, 5);
gl2.glMatrixMode(GL2.GL_MODELVIEW);
gl2.glClearColor( 0, 0, 0, 1 );
gl2.glEnable(GL2.GL_DEPTH_TEST);
}
public void dispose(GLAutoDrawable drawable) {
// called when the panel is being disposed
}
public void reshape(GLAutoDrawable drawable, int x, int y, int width, int height) {
// called when user resizes the window
}
// —————- Methods from the KeyListener interface ————–
public void keyPressed(KeyEvent evt) {
int key = evt.getKeyCode();
if ( key == KeyEvent.VK_LEFT )
rotateY -= 15;
else if ( key == KeyEvent.VK_RIGHT )
rotateY += 15;
else if ( key == KeyEvent.VK_DOWN)
rotateX += 15;
else if ( key == KeyEvent.VK_UP )
rotateX -= 15;
else if ( key == KeyEvent.VK_PAGE_UP )
rotateZ += 15;
else if ( key == KeyEvent.VK_PAGE_DOWN )
rotateZ -= 15;
else if ( key == KeyEvent.VK_HOME )
rotateX = rotateY = rotateZ = 0;
repaint();
}
public void keyReleased(KeyEvent evt) {
}
public void keyTyped(KeyEvent evt) {
}
}
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