242 lines
6.3 KiB
JavaScript
242 lines
6.3 KiB
JavaScript
/*
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3DHOP - 3D Heritage Online Presenter
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Copyright (c) 2014-2020, Visual Computing Lab, ISTI - CNR
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All rights reserved.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* Constructs a SphereTrackball object.
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* @class Interactor which implements a full spherical trackball controller.
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*/
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function SphereTrackball() {
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}
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SphereTrackball.prototype = {
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setup : function (options) {
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options = options || {};
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var opt = sglGetDefaultObject({
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startCenter : [ 0.0, 0.0, 0.0 ],
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startDistance : 2.0,
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minMaxDist : [0.2, 4.0],
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}, options);
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this._action = SGL_TRACKBALL_NO_ACTION;
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this._new_action = true;
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this._matrix = SglMat4.identity();
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this._sphereMatrix = SglMat4.identity();
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// starting/default parameters
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this._startDistance = opt.startDistance; //distance
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// current parameters
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this._distance = this._startDistance;
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//limits
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this._minMaxDist = opt.minMaxDist;
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this._pts = [ [0.0, 0.0], [0.0, 0.0] ];
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this._start = [0.0, 0.0];
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this.reset();
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},
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clamp : function(value, low, high) {
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if(value < low) return low;
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if(value > high) return high;
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return value;
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},
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_computeMatrix: function() {
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var m = SglMat4.identity();
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// zoom
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m = SglMat4.mul(m, SglMat4.translation([0.0, 0.0, -this._distance]));
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// spheretrack
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m = SglMat4.mul(m, this._sphereMatrix);
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this._matrix = m;
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if(typeof onTrackballUpdate != "undefined")
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onTrackballUpdate(this.getState());
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},
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_projectOnSphere : function(x, y) {
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var r = 1.0;
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var z = 0.0;
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var d = sglSqrt(x*x + y*y);
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if (d < (r * 0.70710678118654752440)) {
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/* Inside sphere */
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z = sglSqrt(r*r - d*d);
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}
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else {
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/* On hyperbola */
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t = r / 1.41421356237309504880;
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z = t*t / d;
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}
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return z;
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},
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_transform : function(m, x, y, z) {
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return SglMat4.mul4(m, [x, y, z, 0.0]);
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},
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_transformOnSphere : function(m, x, y) {
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var z = this._projectOnSphere(x, y); //get z value
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return this._transform(m, x, y, z);
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},
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_translate : function(offset, f) {
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var invMat = SglMat4.inverse(this._sphereMatrix);
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var t = SglVec3.to4(offset, 0.0);
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t = SglMat4.mul4(invMat, t);
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t = SglVec4.muls(t, f);
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var trMat = SglMat4.translation(t);
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this._sphereMatrix = SglMat4.mul(this._sphereMatrix, trMat);
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},
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getState : function () {
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return this._sphereMatrix;
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},
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setState : function (newstate) {
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this._sphereMatrix = newstate;
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this._computeMatrix();
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},
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animateToState : function (newstate) {
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this._sphereMatrix = newstate;
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this._computeMatrix();
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},
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recenter : function (newpoint) {
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var newpanX = (newpoint[0]-presenter.sceneCenter[0]) * presenter.sceneRadiusInv;
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var newpanY = (newpoint[1]-presenter.sceneCenter[1]) * presenter.sceneRadiusInv;
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var newpanZ = (newpoint[2]-presenter.sceneCenter[2]) * presenter.sceneRadiusInv;
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this._sphereMatrix[12] = -newpanX;
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this._sphereMatrix[13] = -newpanY;
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this._sphereMatrix[14] = -newpanZ;
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this._distance *= 0.6;
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this._distance = this.clamp(this._distance, this._minMaxDist[0], this._minMaxDist[1]);
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this._computeMatrix();
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},
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tick : function (dt) {
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return false;
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},
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set action(a) { if(this._action != a) this._new_action = true; this._action = a; },
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get action() { return this._action; },
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get matrix() { this._computeMatrix(); return this._matrix; },
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get distance() { return this._distance; },
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reset : function () {
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this._matrix = SglMat4.identity();
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this._sphereMatrix = SglMat4.identity();
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this._action = SGL_TRACKBALL_NO_ACTION;
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this._new_action = true;
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this._distance = this._startDistance;
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this._pts = [ [0.0, 0.0], [0.0, 0.0] ];
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this._computeMatrix();
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},
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track : function(m, x, y, z) {
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if(this._new_action) {
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this._start[0] = x;
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this._start[1] = y;
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this._new_action = false;
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}
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var dx = this._start[0] - x;
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var dy = this._start[1] - y;
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this._start[0] = x;
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this._start[1] = y;
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this._pts[0][0] = this._pts[1][0] + dx;
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this._pts[0][1] = this._pts[1][1] + dy;
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this._pts[1][0] = dx;
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this._pts[1][1] = dy;
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switch (this._action) {
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case SGL_TRACKBALL_ROTATE:
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this.rotate(m);
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break;
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case SGL_TRACKBALL_PAN:
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this.pan(m);
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break;
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case SGL_TRACKBALL_DOLLY:
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this.dolly(m, z);
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break;
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case SGL_TRACKBALL_SCALE:
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this.scale(m, z);
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break;
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default:
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break;
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}
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},
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rotate : function(m) {
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if ((this._pts[0][0] == this._pts[1][0]) && (this._pts[0][1] == this._pts[1][1])) return; //if Xold == Xnew && Yold ==Ynew return
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var mInv = SglMat4.inverse(m);
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var v0 = this._transformOnSphere(mInv, this._pts[0][0], this._pts[0][1]); //project on sphere (Xold, Yold)
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var v1 = this._transformOnSphere(mInv, this._pts[1][0], this._pts[1][1]); //project on sphere (Xnew, Ynew)
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var axis = SglVec3.cross(v0, v1); //axis of rotation
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var angle = SglVec3.length(axis); //angle of rotation
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var rotMat = SglMat4.rotationAngleAxis(angle, axis);
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this._sphereMatrix = SglMat4.mul(rotMat, this._sphereMatrix);
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this._computeMatrix();
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},
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pan : function(m) {
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var mInv = SglMat4.inverse(m);
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var v0 = this._transform(mInv, this._pts[0][0], this._pts[0][1], -1.0);
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var v1 = this._transform(mInv, this._pts[1][0], this._pts[1][1], -1.0);
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var offset = SglVec3.sub(v1, v0);
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this._translate(offset, 2.0);
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this._computeMatrix();
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},
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dolly : function(m, dz) {
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var mInv = SglMat4.inverse(m);
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var offset = this._transform(mInv, 0.0, 0.0, dz);
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this._translate(offset, 1.0);
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this._computeMatrix();
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},
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scale : function(m, s) {
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this._distance *= s;
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this._distance = this.clamp(this._distance, this._minMaxDist[0], this._minMaxDist[1]);
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this._computeMatrix();
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}
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};
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/***********************************************************************/
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