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////////////////////////////////////////////////////////////////////////
//
// This JavaScript file is a simple concatenation of the files
// `lights.js' and `turntable.js' from the `doc/javascript' directory.
//
////////////////////////////////////////////////////////////////////////

////////////////////////////////////////////////////////////////////////
//
// lights.js
//
// example JavaScript for use with `3Djscript' option of \includemovie
//
// * Adds light sources around the object for better illumination.
//
////////////////////////////////////////////////////////////////////////

//first remove any scene lights
for (var i = scene.lights.count - 1; i >= 0; i--) {
  scene.lights.removeByIndex(i);
}

//new lights
//from left
l1 = scene.createLight();
l1.color.set(1,1,1);
l1.brightness = .4;
l1.direction.set(1,0,0);

//from right
l2 = scene.createLight();
l2.color.set(1,1,1);
l2.brightness = .4;
l2.direction.set(-1,0,0);

//from bottom
l3 = scene.createLight();
l3.color.set(1,1,1);
l3.brightness = .4;
l3.direction.set(0,0,1);

//from top
l4 = scene.createLight();
l4.color.set(1,1,1);
l4.brightness = .4;
l4.direction.set(0,0,-1);

//from front
l5 = scene.createLight();
l5.color.set(1,1,1);
l5.brightness = .4;
l5.direction.set(0,1,0);

//from back
l6 = scene.createLight();
l6.color.set(1,1,1);
l6.brightness = .4;
l6.direction.set(0,-1,0);

/////////////////////////////////////////////////////////////////////
//
// turntable.js
//
// JavaScript for use with `3Djscript' option of \includemovie
//
// * Greatly improves the rotational behaviour of the 3D object,
//   prevents it from tilting to the side while dragging the mouse.
//   This is achieved by suppressing the rolling of the camera about
//   its optical axis.
//
/////////////////////////////////////////////////////////////////////

// maximum pitch (degrees from horizontal) of the camera
var max_alpha = 88;
var min_beta = 90 - max_alpha; // the complement
var cos_min_beta = Math.cos(min_beta * Math.PI/180);
var tan_min_beta = Math.tan(min_beta * Math.PI/180);

var camera = scene.cameras.getByIndex(0);

//updates the vertical axis of rotation whenever a predefined view
//is selected from the drop down list in the 3D toolbar
var cameraEventHandler = new CameraEventHandler();
cameraEventHandler.onEvent = function (e) {
  camera.axis_up = camera.up.subtract(camera.position);
  camera.axis_up.normalize();
}
runtime.addEventHandler(cameraEventHandler);

//suppresses camera rolling and limits camera pitch
var mouseEventHandler = new MouseEventHandler();
mouseEventHandler.onMouseMove = true;
mouseEventHandler.onEvent = function (e) {
  var c2c = camera.position.subtract(camera.targetPosition);
  var roo = c2c.length;
  c2c.normalize();
  cos_beta = c2c.dot(camera.axis_up); //cos of enclosed angle

  //correct the camera position if it is too high or too low
  if(Math.abs(cos_beta) > cos_min_beta) {
    //auxiliary vectors a & b
    var a = camera.axis_up.scale(cos_beta);
    var b = c2c.subtract(a);
    b.normalize();
    b.scaleInPlace(tan_min_beta * a.length);

    c2c.set(a.add(b));
    c2c.normalize();

    camera.position.set(camera.targetPosition.add(c2c.scale(roo)));
    cos_beta = c2c.dot(camera.axis_up);
  }

  //suppress rolling
  camera.up.set(
    camera.position.add(camera.axis_up).add(c2c.scale(-cos_beta))
  );
};
runtime.addEventHandler(mouseEventHandler);