src/edu/berkeley/qfat/MeshViewer.java

   1 package edu.berkeley.qfat;
   2 import java.io.*;
   3 import java.nio.*;
   4 import java.awt.*;
   5 import java.awt.event.*;
   6 import javax.swing.*;
   7 import javax.media.opengl.*;
   8 import javax.media.opengl.glu.*;
   9 import com.sun.opengl.util.*;
  10 import java.util.*;
  11 import edu.berkeley.qfat.bind.*;
  12 import edu.berkeley.qfat.geom.*;
  13 import edu.berkeley.qfat.geom.Point;
  14
  15 /**
  16  *  A basic MeshViewer displays zero or more meshes to the user, in
  17  *  wireframe or shaded panels.
  18  */
  19 public class MeshViewer extends JPanel implements GLEventListener, MouseListener, MouseMotionListener, KeyListener, MouseWheelListener {
  20
  21     Main main;
  22
  23     private float tz = 0;
  24     private float anglex = 0;
  25     private float angley = 0;
  26
  27     boolean drawEdge = false;
  28
  29     private Mesh.Vertex closest = null;
  30     private Mesh.E      closestEdge = null;
  31     private Point       closestOriginallyAt = null;
  32     private int         mousex;
  33     private int         mousey;
  34     private Matrix      projection = null;
  35     private Point       clickPoint = null;
  36     private GLCanvas    glcanvas;
  37     private boolean     updateVisibilities = false;
  38     private boolean     updateClosest = false;
  39     private boolean     mouseInside = false;
  40
  41     private HashSet<Mesh> meshes = new HashSet<Mesh>();
  42
  43     public synchronized void addMesh(Mesh m) { meshes.add(m); }
  44     public synchronized void removeMesh(Mesh m) { meshes.remove(m); }
  45
  46     public void reshape(GLAutoDrawable drawable, int x, int y, int width, int height) { }
  47     public void displayChanged(GLAutoDrawable drawable, boolean modeChanged, boolean deviceChanged) { }
  48
  49     public void addKeyListener(KeyListener kl) { glcanvas.addKeyListener(kl); }
  50
  51     public synchronized void init(GLAutoDrawable gld) {
  52         GL gl = glcanvas.getGL();//gld.getGL();
  53         gl.glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
  54         gl.glViewport(0, 0, 500, 300);
  55         gl.glEnable(GL.GL_DEPTH_TEST);
  56         gl.glClearDepth(1.0);
  57         gl.glDepthFunc(GL.GL_LEQUAL);
  58         gl.glMatrixMode(GL.GL_PROJECTION);
  59         gl.glLoadIdentity();
  60         gl.glMatrixMode(GL.GL_MODELVIEW);
  61
  62         float mat_specular[] = { 0.5f, 0.5f, 0.5f, 0.5f };
  63         float mat_shininess[] = { 50.0f };
  64         gl.glShadeModel(GL.GL_SMOOTH);
  65         gl.glLightfv(GL.GL_LIGHT0, GL.GL_POSITION, new float[] { 1.0f,    4.0f,  -10.0f, 0.0f }, 0);
  66         gl.glLightfv(GL.GL_LIGHT1, GL.GL_POSITION, new float[] { -10.0f, 10.0f,   10.0f, 0.0f }, 0);
  67         gl.glLightfv(GL.GL_LIGHT2, GL.GL_POSITION, new float[] { 10.0f, -10.0f,   10.0f, 0.0f }, 0);
  68         gl.glLightfv(GL.GL_LIGHT3, GL.GL_POSITION, new float[] { 10.0f,  10.0f,  -10.0f, 0.0f }, 0);
  69         gl.glLightfv(GL.GL_LIGHT4, GL.GL_POSITION, new float[] { -10.0f, 10.0f,  -10.0f, 0.0f }, 0);
  70         gl.glLightfv(GL.GL_LIGHT5, GL.GL_POSITION, new float[] { 10.0f, -10.0f,  -10.0f, 0.0f }, 0);
  71         gl.glEnable(GL.GL_LIGHTING);
  72         gl.glEnable(GL.GL_LIGHT0);
  73
  74         gl.glColorMaterial(GL.GL_FRONT_AND_BACK, GL.GL_AMBIENT_AND_DIFFUSE);
  75         gl.glEnable(GL.GL_COLOR_MATERIAL);
  76
  77         display(gld);
  78
  79         // hack to get around Mac OS bug
  80         IntBuffer buf = ByteBuffer.allocateDirect(9*4*4).order(ByteOrder.nativeOrder()).asIntBuffer();
  81         gl.glReadPixels(0,0, 1, 1, gl.GL_RGB, gl.GL_UNSIGNED_BYTE, buf);
  82     }
  83
  84     public synchronized final void display(GLAutoDrawable drawable) {
  85         glcanvas.setSize(glcanvas.getParent().getWidth(), glcanvas.getParent().getHeight());
  86
  87         GL gl = glcanvas.getGL();//drawable.getGL();
  88         GLU glu = new GLU();
  89
  90         if (!mouseInside) gl.glClearColor(0.1f, 0.1f, 0.1f, 1.0f);
  91         else gl.glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
  92
  93         gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);
  94         gl.glPointSize(5.0f);
  95         gl.glLoadIdentity();
  96         glu.gluPerspective(50, ((float)drawable.getWidth())/drawable.getHeight(), 0.5, 10);
  97
  98         glu.gluLookAt(0, 0, -((tz/10)-1), 0, 0, 0, 0, 1, 0);
  99         gl.glRotatef(anglex/3, 0, 1, 0);
 100         gl.glRotatef(-(angley/3), 1, 0, 0);
 101
 102         gl.glEnable(GL.GL_LIGHTING);
 103         gl.glShadeModel(GL.GL_SMOOTH);
 104         for(Mesh mesh : meshes) {
 105             mesh.render(gl, Matrix.ONE);
 106             if (main != null && main.whichNeighbor>0 && main.transforms!=null && !mesh.option_wireframe) {
 107                 mesh.option_wireframe = true;
 108                 mesh.render(gl, main.transforms[main.whichNeighbor-1]);
 109                 mesh.option_wireframe = false;
 110             }
 111         }
 112
 113         // highlight the point closest to the mouse; we do this here to avoid flicker
 114         if (closest != null) {
 115             gl.glDisable(GL.GL_LIGHTING);
 116             gl.glShadeModel(GL.GL_FLAT);
 117
 118             if (drawEdge) {
 119                 for(Mesh.E e : (Iterable<Mesh.E>)closestEdge.getBoundPeers()) {
 120                     gl.glColor3f(0,1,0);
 121                     gl.glBegin(gl.GL_LINES);
 122                     e.glVertices(gl);
 123                     gl.glEnd();
 124                     gl.glColor3f(1,0,0);
 125                     gl.glBegin(gl.GL_LINES);
 126                     e.pair.glVertices(gl);
 127                     gl.glEnd();
 128                 }
 129                 /*
 130                 if (closestEdge != null) {
 131                     gl.glColor3f(1,1,0);
 132                     gl.glBegin(gl.GL_TRIANGLES);
 133                     Mesh.T t = closestEdge.t;
 134                     t.p1().glVertex(gl);
 135                     t.p2().glVertex(gl);
 136                     t.p3().glVertex(gl);
 137                     gl.glColor3f(0,1,1);
 138                     main.transforms[main.whichNeighbor-1].times(closestEdge.t.p1()).glVertex(gl);
 139                     main.transforms[main.whichNeighbor-1].times(closestEdge.t.p2()).glVertex(gl);
 140                     main.transforms[main.whichNeighbor-1].times(closestEdge.t.p3()).glVertex(gl);
 141                     System.out.println("t="
 142                                        +t.p1()+"\n  "
 143                                        +t.p2()+"\n  "
 144                                        +t.p3()+"\n  "
 145                                        );
 146                     System.out.println("x="
 147                                        +main.transforms[main.whichNeighbor-1].times(t.p1())+"\n  "
 148                                        +main.transforms[main.whichNeighbor-1].times(t.p2())+"\n  "
 149                                        +main.transforms[main.whichNeighbor-1].times(t.p3())+"\n  "
 150                                        );
 151                     gl.glEnd();
 152                 }
 153                 */
 154             }
 155
 156             if (closest.visible) {
 157                 gl.glDisable(GL.GL_DEPTH_TEST);
 158                 gl.glColor3f(1,1,0);
 159                 gl.glBegin(gl.GL_POINTS);
 160                 closest.getPoint().glVertex(gl);
 161                 gl.glColor3f(0.5f,0.5f,0);
 162                 for(Mesh.Vertex v : (Iterable<Mesh.Vertex>)closest.getBoundPeers())
 163                     if (v!=closest)
 164                         v.getPoint().glVertex(gl);
 165                 gl.glEnd();
 166
 167                 if (closest.getBindingConstraint() instanceof Plane) {
 168                     Plane p = (Plane)closest.getBindingConstraint();
 169                     Vec v = p.norm();
 170                     gl.glEnable(gl.GL_BLEND);
 171                     gl.glBlendFunc(gl.GL_SRC_ALPHA, gl.GL_ONE_MINUS_SRC_ALPHA);
 172                     gl.glColor4f(1,1,0,0.3f);
 173                     gl.glBegin(gl.GL_LINES);
 174                     closest.getPoint().glVertex(gl);
 175                     v.plus(closest.getPoint()).glVertex(gl);
 176                     closest.getPoint().glVertex(gl);
 177                     v.times(-1).plus(closest.getPoint()).glVertex(gl);
 178                     gl.glEnd();
 179                     gl.glDisable(gl.GL_BLEND);
 180                 }
 181
 182                 gl.glEnable(GL.GL_DEPTH_TEST);
 183             }
 184         }
 185
 186         projection = Matrix.getProjectionMatrix(gl);
 187
 188         if (updateVisibilities) {
 189             updateVisibilities = false;
 190             // update vertex visibilities
 191             updateVisibility(gl);
 192         }
 193
 194         if (updateClosest) {
 195             updateClosest = false;
 196             double dist = Double.MAX_VALUE;
 197             double distE = Double.MAX_VALUE;
 198             closest = null;
 199             closestOriginallyAt = null;
 200             closestEdge = null;
 201             for(Mesh mesh : meshes)
 202                 if (mesh.option_selectable)
 203                     for(Mesh.Vertex v : mesh.vertices()) {
 204                         if (!v.visible) continue;
 205                         Point p = projection.times(v.getPoint());
 206                         int x = (int)p.x;
 207                         int y = (int)p.y;
 208                         int mousex = (int)getMouse().x;
 209                         int mousey = (int)getMouse().y;
 210                         if (closest==null || (x-mousex)*(x-mousex)+(y-mousey)*(y-mousey) < dist) {
 211                             dist = (x-mousex)*(x-mousex)+(y-mousey)*(y-mousey);
 212                             closest = v;
 213                         }
 214                         for(Mesh.E e = v.e; e!=null; e=e.pair.next==v.e?null:e.pair.next) {
 215                             if (!e.v2.visible) continue;
 216                             Segment s =
 217                                 new Segment(projection.times(e.v1.getPoint()),
 218                                             projection.times(e.v2.getPoint()));
 219                             double dist2 = s.distance(getMouse());
 220                             if (dist2 < distE) {
 221                                 distE = dist2;
 222                                 closestEdge = e;
 223                             }
 224                         }
 225                     }
 226         }
 227     }
 228
 229     protected synchronized void updateVisibility(GL gl) {
 230         IntBuffer buf = ByteBuffer.allocateDirect(9*4*4).order(ByteOrder.nativeOrder()).asIntBuffer();
 231         gl.glFlush();
 232         gl.glDrawBuffer(GL.GL_BACK);
 233         gl.glReadBuffer(GL.GL_BACK);
 234         gl.glPixelStorei(GL.GL_PACK_ALIGNMENT, 1);
 235         gl.glFlush();
 236         gl.glDisable(GL.GL_LIGHTING);
 237         gl.glShadeModel(GL.GL_FLAT);
 238         gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);
 239         gl.glColor3f(0,0,0);
 240         for(Mesh mesh : meshes) mesh.render(gl, Matrix.ONE, true);
 241         for(Mesh mesh : meshes)
 242             if (mesh.option_selectable)
 243                 for(Mesh.Vertex v : mesh.vertices()) {
 244                     Point p = v.getPoint();
 245                     Point projected = projection.times(p);
 246                     boolean vis = false;
 247
 248                     gl.glColor3f(1,1,1);
 249                     gl.glBegin(gl.GL_POINTS);
 250                     p.glVertex(gl);
 251                     gl.glEnd();
 252                     gl.glFlush();
 253
 254                     vis = false;
 255                     gl.glReadPixels((int)projected.x-1, (int)projected.y-1, 3, 3, gl.GL_RGB, gl.GL_UNSIGNED_BYTE, buf);
 256                     for(int j=0; j<9*4; j++) vis |= buf.get(j)!=0;
 257
 258                     v.visible = vis;
 259                     if (vis) {
 260                         gl.glColor3f(0,0,0);
 261                         gl.glBegin(gl.GL_POINTS);
 262                         p.glVertex(gl);
 263                         gl.glEnd();
 264                     }
 265                 }
 266         gl.glShadeModel(GL.GL_SMOOTH);
 267         gl.glEnable(GL.GL_LIGHTING);
 268         gl.glDrawBuffer(GL.GL_FRONT);
 269     }
 270
 271     /** return the position of the mouse as a point in window-space */
 272     public Point getMouse() {
 273         return new Point(mousex, glcanvas.getHeight()-mousey, 0);
 274     }
 275
 276     /** return the position where the mouse button was pressed, or null if it is not currently pressed */
 277     public Point getMouseClick() {
 278         return clickPoint;
 279     }
 280
 281     public void mouseWheelMoved(MouseWheelEvent e) {
 282         tz -= e.getWheelRotation();
 283     }
 284
 285     public void keyTyped(KeyEvent e)  { }
 286     public void keyPressed(KeyEvent e)  { }
 287     public void keyReleased(KeyEvent e) { }
 288
 289     public void mouseClicked(MouseEvent e) { }
 290     public void mouseEntered(MouseEvent e) { mouseInside = true; }
 291     public void mouseExited(MouseEvent e) { mouseInside = false; }
 292     public void mousePressed(MouseEvent e) {
 293         clickPoint = getMouse();
 294     }
 295
 296     public void mouseReleased(MouseEvent e) {
 297         clickPoint = null;
 298     }
 299
 300     public void mouseMoved(MouseEvent e) {
 301         mousex = e.getX();
 302         mousey = e.getY();
 303
 304         if ((e.getModifiersEx() & MouseEvent.SHIFT_DOWN_MASK) != 0) {
 305             updateVisibilities = true;
 306             drawEdge = true;
 307             updateClosest = true;
 308         }
 309     }
 310
 311     public void mouseDragged(MouseEvent e) {
 312         if ((e.getModifiersEx() & MouseEvent.SHIFT_DOWN_MASK) != 0) {
 313             updateVisibilities = true;
 314             drawEdge = true;
 315             if (closest != null && projection != null) {
 316                 synchronized(this) {
 317                     if (closestOriginallyAt==null) closestOriginallyAt = closest.getPoint();
 318                     Vec d1 = projection.inverse().times(getMouse()).minus(projection.inverse().times(clickPoint));
 319                     Vec delta = d1.plus(closestOriginallyAt).minus(closest.getPoint());
 320                     closest.move(delta, false);
 321                 }
 322             }
 323         } else if ((e.getModifiersEx() & MouseEvent.CTRL_DOWN_MASK) != 0) {
 324             // move edge
 325         } else {
 326             updateVisibilities = true;
 327             anglex -= mousex - e.getX();
 328             angley += mousey - e.getY();
 329         }
 330         mousex = e.getX();
 331         mousey = e.getY();
 332     }
 333
 334     public MeshViewer() {
 335         glcanvas = new GLCanvas();
 336         glcanvas.addGLEventListener(this);
 337         setLayout(new BorderLayout());
 338         this.add(glcanvas, BorderLayout.CENTER);
 339         glcanvas.addMouseListener(this);
 340         glcanvas.addMouseMotionListener(this);
 341         glcanvas.addMouseWheelListener(this);
 342         glcanvas.addKeyListener(this);
 343     }
 344
 345     public void repaint() {
 346         if (glcanvas != null) glcanvas.repaint();
 347     }
 348
 349 }