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
  54         gl.glEnable(gl.GL_DOUBLEBUFFER);
  55
  56         gl.glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
  57         gl.glViewport(0, 0, 500, 300);
  58         gl.glEnable(GL.GL_DEPTH_TEST);
  59         gl.glClearDepth(1.0);
  60         gl.glDepthFunc(GL.GL_LEQUAL);
  61         gl.glMatrixMode(GL.GL_PROJECTION);
  62         gl.glLoadIdentity();
  63         gl.glMatrixMode(GL.GL_MODELVIEW);
  64
  65         float mat_specular[] = { 0.5f, 0.5f, 0.5f, 0.5f };
  66         float mat_shininess[] = { 50.0f };
  67         gl.glShadeModel(GL.GL_SMOOTH);
  68         gl.glLightfv(GL.GL_LIGHT0, GL.GL_POSITION, new float[] { 1.0f,    4.0f,  -10.0f, 0.0f }, 0);
  69         gl.glLightfv(GL.GL_LIGHT1, GL.GL_POSITION, new float[] { -10.0f, 10.0f,   10.0f, 0.0f }, 0);
  70         gl.glLightfv(GL.GL_LIGHT2, GL.GL_POSITION, new float[] { 10.0f, -10.0f,   10.0f, 0.0f }, 0);
  71         gl.glLightfv(GL.GL_LIGHT3, GL.GL_POSITION, new float[] { 10.0f,  10.0f,  -10.0f, 0.0f }, 0);
  72         gl.glLightfv(GL.GL_LIGHT4, GL.GL_POSITION, new float[] { -10.0f, 10.0f,  -10.0f, 0.0f }, 0);
  73         gl.glLightfv(GL.GL_LIGHT5, GL.GL_POSITION, new float[] { 10.0f, -10.0f,  -10.0f, 0.0f }, 0);
  74         gl.glEnable(GL.GL_LIGHTING);
  75         gl.glEnable(GL.GL_LIGHT0);
  76
  77         gl.glColorMaterial(GL.GL_FRONT_AND_BACK, GL.GL_AMBIENT_AND_DIFFUSE);
  78         gl.glEnable(GL.GL_COLOR_MATERIAL);
  79
  80         display(gld);
  81
  82         // hack to get around Mac OS bug
  83         IntBuffer buf = ByteBuffer.allocateDirect(9*4*4).order(ByteOrder.nativeOrder()).asIntBuffer();
  84         gl.glReadPixels(0,0, 1, 1, gl.GL_RGB, gl.GL_UNSIGNED_BYTE, buf);
  85     }
  86
  87     public synchronized final void display(GLAutoDrawable drawable) {
  88         glcanvas.setSize(glcanvas.getParent().getWidth(), glcanvas.getParent().getHeight());
  89
  90         GL gl = glcanvas.getGL();//drawable.getGL();
  91         GLU glu = new GLU();
  92         gl.glDrawBuffer(GL.GL_BACK);
  93
  94         if (updateVisibilities) {
  95             updateVisibilities = false;
  96             // update vertex visibilities
  97             updateVisibility(gl);
  98         }
  99         gl.glDrawBuffer(GL.GL_BACK);
 100
 101         if (!mouseInside) gl.glClearColor(0.1f, 0.1f, 0.1f, 1.0f);
 102         else gl.glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
 103
 104         gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);
 105         gl.glPointSize(5.0f);
 106         gl.glLoadIdentity();
 107         glu.gluPerspective(50, ((float)drawable.getWidth())/drawable.getHeight(), 0.5, 10);
 108
 109         glu.gluLookAt(0, 0, -((tz/10)-1), 0, 0, 0, 0, 1, 0);
 110         gl.glRotatef(anglex/3, 0, 1, 0);
 111         gl.glRotatef(-(angley/3), 1, 0, 0);
 112
 113         gl.glEnable(GL.GL_LIGHTING);
 114         gl.glShadeModel(GL.GL_SMOOTH);
 115         for(Mesh mesh : meshes) {
 116             mesh.render(gl, Matrix.ONE);
 117             if (main != null && main.whichNeighbor>0 && main.transforms!=null && !mesh.option_wireframe) {
 118                 mesh.option_wireframe = true;
 119                 mesh.render(gl, main.transforms[main.whichNeighbor-1]);
 120                 mesh.option_wireframe = false;
 121             }
 122         }
 123
 124         // highlight the point closest to the mouse; we do this here to avoid flicker
 125         if (closest != null) {
 126             gl.glDisable(GL.GL_LIGHTING);
 127             gl.glShadeModel(GL.GL_FLAT);
 128
 129             if (drawEdge) {
 130                 for(Mesh.E e : (Iterable<Mesh.E>)closestEdge.getBoundPeers()) {
 131                     gl.glColor3f(0,1,0);
 132                     gl.glBegin(gl.GL_LINES);
 133                     e.glVertices(gl);
 134                     gl.glEnd();
 135                     gl.glColor3f(1,0,0);
 136                     gl.glBegin(gl.GL_LINES);
 137                     e.pair.glVertices(gl);
 138                     gl.glEnd();
 139                 }
 140                 /*
 141                 if (closestEdge != null) {
 142                     gl.glColor3f(1,1,0);
 143                     gl.glBegin(gl.GL_TRIANGLES);
 144                     Mesh.T t = closestEdge.t;
 145                     t.p1().glVertex(gl);
 146                     t.p2().glVertex(gl);
 147                     t.p3().glVertex(gl);
 148                     gl.glColor3f(0,1,1);
 149                     main.transforms[main.whichNeighbor-1].times(closestEdge.t.p1()).glVertex(gl);
 150                     main.transforms[main.whichNeighbor-1].times(closestEdge.t.p2()).glVertex(gl);
 151                     main.transforms[main.whichNeighbor-1].times(closestEdge.t.p3()).glVertex(gl);
 152                     System.out.println("t="
 153                                        +t.p1()+"\n  "
 154                                        +t.p2()+"\n  "
 155                                        +t.p3()+"\n  "
 156                                        );
 157                     System.out.println("x="
 158                                        +main.transforms[main.whichNeighbor-1].times(t.p1())+"\n  "
 159                                        +main.transforms[main.whichNeighbor-1].times(t.p2())+"\n  "
 160                                        +main.transforms[main.whichNeighbor-1].times(t.p3())+"\n  "
 161                                        );
 162                     gl.glEnd();
 163                 }
 164                 */
 165             }
 166
 167             if (closest.visible) {
 168                 gl.glDisable(GL.GL_DEPTH_TEST);
 169                 gl.glColor3f(1,1,0);
 170                 gl.glBegin(gl.GL_POINTS);
 171                 closest.getPoint().glVertex(gl);
 172                 gl.glColor3f(0.5f,0.5f,0);
 173                 for(Mesh.Vertex v : (Iterable<Mesh.Vertex>)closest.getBoundPeers())
 174                     if (v!=closest)
 175                         v.getPoint().glVertex(gl);
 176                 gl.glEnd();
 177
 178                 if (closest.getBindingConstraint() instanceof Plane) {
 179                     Plane p = (Plane)closest.getBindingConstraint();
 180                     Vec v = p.norm();
 181                     gl.glEnable(gl.GL_BLEND);
 182                     gl.glBlendFunc(gl.GL_SRC_ALPHA, gl.GL_ONE_MINUS_SRC_ALPHA);
 183                     gl.glColor4f(1,1,0,0.3f);
 184                     gl.glBegin(gl.GL_LINES);
 185                     closest.getPoint().glVertex(gl);
 186                     v.plus(closest.getPoint()).glVertex(gl);
 187                     closest.getPoint().glVertex(gl);
 188                     v.times(-1).plus(closest.getPoint()).glVertex(gl);
 189                     gl.glEnd();
 190                     gl.glDisable(gl.GL_BLEND);
 191                 }
 192
 193                 gl.glEnable(GL.GL_DEPTH_TEST);
 194             }
 195         }
 196
 197         projection = Matrix.getProjectionMatrix(gl);
 198
 199         if (updateClosest) {
 200             updateClosest = false;
 201             double dist = Double.MAX_VALUE;
 202             double distE = Double.MAX_VALUE;
 203             closest = null;
 204             closestOriginallyAt = null;
 205             closestEdge = null;
 206             for(Mesh mesh : meshes)
 207                 if (mesh.option_selectable)
 208                     for(Mesh.Vertex v : mesh.vertices()) {
 209                         if (!v.visible) continue;
 210                         Point p = projection.times(v.getPoint());
 211                         int x = (int)p.x;
 212                         int y = (int)p.y;
 213                         int mousex = (int)getMouse().x;
 214                         int mousey = (int)getMouse().y;
 215                         if (closest==null || (x-mousex)*(x-mousex)+(y-mousey)*(y-mousey) < dist) {
 216                             dist = (x-mousex)*(x-mousex)+(y-mousey)*(y-mousey);
 217                             closest = v;
 218                         }
 219                         for(Mesh.E e = v.e; e!=null; e=e.pair.next==v.e?null:e.pair.next) {
 220                             if (!e.v2.visible) continue;
 221                             Segment s =
 222                                 new Segment(projection.times(e.v1.getPoint()),
 223                                             projection.times(e.v2.getPoint()));
 224                             double dist2 = s.distance(getMouse());
 225                             if (dist2 < distE) {
 226                                 distE = dist2;
 227                                 closestEdge = e;
 228                             }
 229                         }
 230                     }
 231         }
 232         gl.glFlush();
 233         glcanvas.setAutoSwapBufferMode(false);
 234         glcanvas.swapBuffers();
 235     }
 236
 237     protected synchronized void updateVisibility(GL gl) {
 238         IntBuffer buf = ByteBuffer.allocateDirect(9*4*4).order(ByteOrder.nativeOrder()).asIntBuffer();
 239         gl.glFlush();
 240         gl.glDrawBuffer(GL.GL_BACK);
 241         gl.glReadBuffer(GL.GL_BACK);
 242         gl.glPixelStorei(GL.GL_PACK_ALIGNMENT, 1);
 243         gl.glFlush();
 244         gl.glDisable(GL.GL_LIGHTING);
 245         gl.glShadeModel(GL.GL_FLAT);
 246         gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);
 247         gl.glColor3f(0,0,0);
 248         for(Mesh mesh : meshes) mesh.render(gl, Matrix.ONE, true);
 249         for(Mesh mesh : meshes)
 250             if (mesh.option_selectable)
 251                 for(Mesh.Vertex v : mesh.vertices()) {
 252                     Point p = v.getPoint();
 253                     Point projected = projection.times(p);
 254                     boolean vis = false;
 255
 256                     gl.glColor3f(1,1,1);
 257                     gl.glBegin(gl.GL_POINTS);
 258                     p.glVertex(gl);
 259                     gl.glEnd();
 260                     gl.glFlush();
 261
 262                     vis = false;
 263                     gl.glReadPixels((int)projected.x-1, (int)projected.y-1, 3, 3, gl.GL_RGB, gl.GL_UNSIGNED_BYTE, buf);
 264                     for(int j=0; j<9*4; j++) vis |= buf.get(j)!=0;
 265
 266                     v.visible = vis;
 267                     if (vis) {
 268                         gl.glColor3f(0,0,0);
 269                         gl.glBegin(gl.GL_POINTS);
 270                         p.glVertex(gl);
 271                         gl.glEnd();
 272                     }
 273                 }
 274         gl.glShadeModel(GL.GL_SMOOTH);
 275         gl.glEnable(GL.GL_LIGHTING);
 276         gl.glDrawBuffer(GL.GL_FRONT);
 277     }
 278
 279     /** return the position of the mouse as a point in window-space */
 280     public Point getMouse() {
 281         return new Point(mousex, glcanvas.getHeight()-mousey, 0);
 282     }
 283
 284     /** return the position where the mouse button was pressed, or null if it is not currently pressed */
 285     public Point getMouseClick() {
 286         return clickPoint;
 287     }
 288
 289     public void mouseWheelMoved(MouseWheelEvent e) {
 290         tz -= e.getWheelRotation();
 291     }
 292
 293     public void keyTyped(KeyEvent e)  { }
 294     public void keyPressed(KeyEvent e)  { }
 295     public void keyReleased(KeyEvent e) { }
 296
 297     public void mouseClicked(MouseEvent e) { }
 298     public void mouseEntered(MouseEvent e) { mouseInside = true; }
 299     public void mouseExited(MouseEvent e) { mouseInside = false; }
 300     public void mousePressed(MouseEvent e) {
 301         clickPoint = getMouse();
 302     }
 303
 304     public void mouseReleased(MouseEvent e) {
 305         clickPoint = null;
 306     }
 307
 308     public void mouseMoved(MouseEvent e) {
 309         mousex = e.getX();
 310         mousey = e.getY();
 311
 312         if ((e.getModifiersEx() & MouseEvent.SHIFT_DOWN_MASK) != 0) {
 313             updateVisibilities = true;
 314             drawEdge = true;
 315             updateClosest = true;
 316         }
 317     }
 318
 319     public void mouseDragged(MouseEvent e) {
 320         if ((e.getModifiersEx() & MouseEvent.SHIFT_DOWN_MASK) != 0) {
 321             updateVisibilities = true;
 322             drawEdge = true;
 323             if (closest != null && projection != null) {
 324                 synchronized(this) {
 325                     if (closestOriginallyAt==null) closestOriginallyAt = closest.getPoint();
 326                     Vec d1 = projection.inverse().times(getMouse()).minus(projection.inverse().times(clickPoint));
 327                     Vec delta = d1.plus(closestOriginallyAt).minus(closest.getPoint());
 328                     closest.move(delta, false);
 329                 }
 330             }
 331         } else if ((e.getModifiersEx() & MouseEvent.CTRL_DOWN_MASK) != 0) {
 332             // move edge
 333         } else {
 334             updateVisibilities = true;
 335             anglex -= mousex - e.getX();
 336             angley += mousey - e.getY();
 337         }
 338         mousex = e.getX();
 339         mousey = e.getY();
 340     }
 341
 342     public MeshViewer() {
 343         glcanvas = new GLCanvas();
 344         glcanvas.addGLEventListener(this);
 345         setLayout(new BorderLayout());
 346         this.add(glcanvas, BorderLayout.CENTER);
 347         glcanvas.addMouseListener(this);
 348         glcanvas.addMouseMotionListener(this);
 349         glcanvas.addMouseWheelListener(this);
 350         glcanvas.addKeyListener(this);
 351     }
 352
 353     public void repaint() {
 354         if (glcanvas != null) glcanvas.repaint();
 355     }
 356
 357 }