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import com.sun.opengl.util.BufferUtil;
import com.sun.opengl.util.GLUT;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.nio.ByteBuffer;
import javax.media.opengl.GL;
import javax.media.opengl.GLAutoDrawable;
import javax.media.opengl.GLEventListener;
import javax.media.opengl.glu.GLU;
public class Renderer implements GLEventListener, MouseListener{
private final int RENDER = 1;
private final int SELECT = 2;
private final int SelBufferSize = 512;
private int snowman_display_list;
private float[]cam = new float[9];
private int mode = RENDER;
private int cursorX, cursorY;
private Main main;
private GLAutoDrawable drawable;
public Renderer(Main main){
this.main = main;
}
private void drawSnowMan(GL gl) {
GLUT glut = new GLUT();
// Draw Body
gl.glTranslatef(0.0f, 0.75f, 0.0f);
glut.glutSolidSphere(0.75f, 20, 20);
// Draw Head
gl.glTranslatef(0.0f, 1.0f, 0.0f);
glut.glutSolidSphere(0.25f, 20, 20);
// Draw Eyes
gl.glPushMatrix();
gl.glColor3f(0.0f, 0.0f, 0.0f);
gl.glTranslatef(0.05f, 0.10f, 0.18f);
glut.glutSolidSphere(0.05f, 10, 10);
gl.glTranslatef(-0.1f, 0.0f, 0.0f);
glut.glutSolidSphere(0.05f, 10, 10);
gl.glPopMatrix();
// Draw Nose
gl.glColor3f(1.0f, 0.5f, 0.5f);
gl.glRotatef(0.0f, 1.0f, 0.0f, 0.0f);
glut.glutSolidCone(0.08f, 0.5f, 10, 2);
}
private int createDL(GL gl){
int snowManDL;
// Create the id for the list
snowManDL = gl.glGenLists(1);
gl.glNewList(snowManDL,gl.GL_COMPILE);
drawSnowMan(gl);
gl.glEndList();
return(snowManDL);
}
public void init(GLAutoDrawable arg0) {
final GL gl = arg0.getGL();
this.drawable = arg0;
gl.glEnable(gl.GL_DEPTH_TEST);
gl.glEnable(gl.GL_CULL_FACE);
snowman_display_list = createDL(gl);
cam[0] = 1.5f;
cam[1] = 3.75f;
cam[2] = 3f;
cam[3] = 1.5f;
cam[4] = 1.75f;
cam[5] = 0f;
cam[6] = 0f;
cam[7] = 1f;
cam[8] = 0f;
arg0.addMouseListener(this);
}
private void draw(GL gl) {
// Draw ground
gl.glColor3f(0.9f, 0.9f, 0.9f);
gl.glBegin(gl.GL_QUADS);
gl.glVertex3f(-100.0f, 0.0f, -100.0f);
gl.glVertex3f(-100.0f, 0.0f, 100.0f);
gl.glVertex3f(100.0f, 0.0f, 100.0f);
gl.glVertex3f(100.0f, 0.0f, -100.0f);
gl.glEnd();
// Draw 4 SnowMen
gl.glColor3f(1.0f, 1.0f, 1.0f);
for (int i = 0; i < 2; i++) {
for (int j = 0; j < 2; j++) {
gl.glPushMatrix();
gl.glPushName(i * 2 + j);
gl.glTranslatef((float)(i * 3.0), (float)0, (float)(-j * 3.0));
gl.glColor3f(1.0f, 1.0f, 1.0f);
gl.glCallList(snowman_display_list);
gl.glPopName();
gl.glPopMatrix();
}
}
}
private void drawPickingMode(GL gl) {
// Draw 4 SnowMen
gl.glDisable(gl.GL_DITHER);
for (int i = 0; i < 2; i++) {
for (int j = 0; j < 2; j++) {
gl.glPushMatrix();
switch (i * 2 + j) {
case 0:
gl.glColor3ub((byte)255, (byte)0, (byte)0);
break;
case 1:
gl.glColor3ub((byte)0, (byte)255, (byte)0);
break;
case 2:
gl.glColor3ub((byte)0, (byte)0, (byte)255);
break;
case 3:
gl.glColor3ub((byte)130, (byte)0, (byte)130);
break;
}
gl.glTranslatef((float)(i * 3.0), (float)0, (float)(-j * 3.0));
gl.glCallList(snowman_display_list);
gl.glPopMatrix();
}
}
gl.glEnable(gl.GL_DITHER);
}
private void processPick(GL gl) {
int[]viewport = new int[4];
ByteBuffer pixel = BufferUtil.newByteBuffer(3);
gl.glGetIntegerv(gl.GL_VIEWPORT, viewport, 0);
gl.glReadPixels(cursorX, viewport[3] - cursorY, 1, 1, gl.GL_RGB, gl.GL_UNSIGNED_BYTE, pixel);
System.out.println(pixel.get(0)+" "+pixel.get(1)+" "+pixel.get(2));
if (pixel.get(0) == 255) {
System.out.println("You picked the 1st snowman on the 1st row");
} else if (pixel.get(1) == 255) {
System.out.println("You picked the 1st snowman on the 2nd row");
} else if (pixel.get(2) == 255) {
System.out.println("You picked the 2nd snowman on the 1st row");
} else if (pixel.get(0) == 250) {
System.out.println("You picked the 2nd snowman on the 2nd row");
} else {
System.out.println("You didn't click a snowman!");
}
System.out.println("\n");
}
public void display(GLAutoDrawable arg0) {
final GL gl = arg0.getGL();
gl.glClear(gl.GL_COLOR_BUFFER_BIT | gl.GL_DEPTH_BUFFER_BIT);
gl.glLoadIdentity();
new GLU().gluLookAt(cam[0], cam[1], cam[2], cam[3], cam[4], cam[5], cam[6], cam[7], cam[8]);
if (mode == SELECT)
drawPickingMode(gl);
else
draw(gl);
if (mode == SELECT) {
processPick(gl);
mode = RENDER;
}
else
arg0.swapBuffers();
}
public void reshape(GLAutoDrawable arg0, int arg1, int arg2, int w, int h) {
final GL gl = arg0.getGL();
float ratio;
// Prevent a divide by zero, when window is too short
// (you cant make a window of zero width).
if(h == 0)
h = 1;
ratio = 1.0f * w / h;
// Reset the coordinate system before modifying
gl.glMatrixMode(gl.GL_PROJECTION);
gl.glLoadIdentity();
// Set the viewport to be the entire window
gl.glViewport(0, 0, w, h);
// Set the clipping volume
new GLU().gluPerspective(45,ratio,0.1,1000);
// setting the camera now
gl.glMatrixMode(gl.GL_MODELVIEW);
}
public void displayChanged(GLAutoDrawable arg0, boolean arg1, boolean arg2) {}
public void mouseClicked(MouseEvent e) {
if(e.getButton()==MouseEvent.BUTTON1){
cursorX = e.getPoint().x;
cursorY = e.getPoint().y;
mode = SELECT;
this.main.refresh();
}
}
public void mousePressed(MouseEvent e) {
}
public void mouseReleased(MouseEvent e) {
}
public void mouseEntered(MouseEvent e) {
}
public void mouseExited(MouseEvent e) {
}
} |
