// Simulated screen for view control by dragging points
// Written by Jarek Rossignac June 2006. Modified Septmber 2007
import processing.opengl.*;                // load OpenGL
import javax.media.opengl.*; 
import javax.media.opengl.glu.*; 
import java.nio.*;
GL gl; 
GLU glu; 

boolean pickS=false;

// ** SETUP **
void setup() { size(800, 800, OPENGL); setColors(); sphereDetail(12); //smooth();
  PFont font = loadFont("Courier-14.vlw"); textFont(font, 12);  // font for writing labels on screen
  this.addMouseWheelListener(new CMouseWheelEvent());// wheel 
  gl=((PGraphicsOpenGL)g).gl; glu=((PGraphicsOpenGL)g).glu; 
  M.declare();
  S.declare();
  C.makeMesh(M);
  threshold=C.average();
  } 
 
// ** DRAW **
void draw() {
  lights(); directionalLight(0,0,128,0,1,0); directionalLight(0,0,128,0,0,1);  
  background(white); 
  fill(black); text("Click&drag on nodes to change their value. Hold 't' & drag to change v ("+threshold+")",10,20); noFill();
  fill(black); text("Toggle 'r' to see refined isosurface. Press 's' to smooth it, 'f' to fit ("+C.value(S.g())+")",10,40); noFill();
  fill(black); text("Hold 1, 2, or 3 and drag to change the view. Press 'h' to reset it.",10,60); noFill();
  pushMatrix();
  translate(float(height)/2, float(height)/2, 0.0);     // center view wrt window  
  if (!picked) if (keyPressed&&mousePressed) {changeView();  if (key=='t') {threshold+=(mouseX-pmouseX)/10.;  }; };
  updateView(); 
  C.showBalls();  
  C.showThreshold(); 
   if (!keyPressed&&mousePressed) {
     if (pick) {mark.setTo( fromMouse() ); eye.setTo(fromOrigin()); picked=C.pickBall(mark);  pick=false;} ; 
     if (picked) C.changeRadius();
     else  { viewPar[4][0]+=mouseX-pmouseX; viewPar[4][1]+=mouseY-pmouseY; };
     };
  C.updateCornerVertices(M);
  C.showEdges();
  noFill(); stroke(black); M.showEdges();
  fill(red); stroke(red); M.showIsopointsOnSticks(threshold);
  if (showRefined) {fill(cyan,80);  noStroke(); S.showTriangles();  // fill(green); S.showVertices(2);
  if (pickS) {pickS=false; mark.setTo(fromMouse()); eye.setTo(fromOrigin()); S.hitTriangle(); };
     stroke(dblue); noFill(); S.showBorder();
     S.show();
    }
    else { noFill(); stroke(dmagenta); M.traceIsocurves(threshold); fill(orange,80);  stroke(red); M.fanIsocurves(threshold); };
  popMatrix();
  }

//***      KEY ACTIONS (details in keys tab)
void keyPressed() { keys(); };
void mousePressed() { pick=true; };  
void mouseReleased() {picked=false;};  // reset the view if any key was pressed when mouse was released