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p5.easycam.js
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p5.easycam.js
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/*
*
* The p5.EasyCam library - Easy 3D CameraControl for p5.js and WEBGL.
*
* Copyright © 2017-2024 by p5.EasyCam authors
*
* Source: https://github.com/freshfork/p5.EasyCam
*
* MIT License: https://opensource.org/licenses/MIT
*
*
* explanatory notes:
*
* p5.EasyCam is a derivative of the original PeasyCam Library by Jonathan Feinberg
* and combines new useful features with the great look and feel of its parent.
*
*/
'use strict';
/** @namespace */
var Dw = (function(ext) {
/**
* EasyCam Library Info
*/
const INFO =
{
/** name */ LIBRARY : "p5.EasyCam",
/** version */ VERSION : "1.2.3",
/** author */ AUTHOR : "p5.EasyCam authors",
/** source */ SOURCE : "https://github.com/freshfork/p5.EasyCam",
toString : function(){
return this.LIBRARY+" v"+this.VERSION+" by "+this.AUTHOR+" ("+this.SOURCE+")";
},
};
/**
* EasyCam
*
* <pre>
*
* new Dw.EasyCam(p5.RendererGL, {
* distance : z, // scalar
* center : [x, y, z], // vector
* rotation : [q0, q1, q2, q3], // quaternion
* viewport : [x, y, w, h], // array
* }
*
* </pre>
*
* @param {p5.RendererGL} renderer - p5 WEBGL renderer
* @param {Object} args - {distance, center, rotation, viewport}
*
*/
class EasyCam {
/**
* @constructor
*/
constructor(renderer, args) {
// WEBGL renderer required
if(!(renderer instanceof p5.RendererGL)){
console.log("renderer needs to be an instance of p5.RendererGL");
return;
}
var bounds = renderer.elt.getBoundingClientRect();
// define default args
args = args || {};
if(args.distance === undefined) args.distance = 500;
if(args.center === undefined) args.center = [0, 0, 0];
if(args.rotation === undefined) args.rotation = Rotation.identity();
if(args.viewport === undefined) args.viewport = [0, 0, renderer.width, renderer.height];
if(args.offset === undefined) args.offset = [bounds.x + window.scrollX, bounds.y + window.scrollY];
// library info
this.INFO = INFO;
// set renderer, graphics, p5
// this.renderer;
// this.graphics;
// this.P5
this.setCanvas(renderer);
// self reference
var cam = this;
this.cam = cam;
// some constants
this.LOOK = [0, 0, 1];
this.UP = [0, 1, 0];
// principal axes flags
this.AXIS = new function() {
this.YAW = 0x01;
this.PITCH = 0x02;
this.ROLL = 0x04;
this.ALL = this.YAW | this.PITCH | this.ROLL;
};
// mouse action constraints
this.SHIFT_CONSTRAINT = 0; // applied when pressing the shift key
this.FIXED_CONSTRAINT = 0; // applied, when set by user and SHIFT_CONSTRAINT is 0
this.DRAG_CONSTRAINT = 0; // depending on SHIFT_CONSTRAINT and FIXED_CONSTRAINT, default is ALL
// mouse action speed
this.scale_rotation = 0.001;
this.scale_pan = 0.0002;
this.scale_zoom = 0.001;
this.scale_zoomwheel = 20.0;
// zoom limits
this.distance_min_limit = 0.01;
this.distance_min = 1.0;
this.distance_max = Number.MAX_VALUE;
// main state
this.state = {
distance : args.distance, // scalar
center : args.center.slice(), // vec3
rotation : args.rotation.slice(), // quaternion
copy : function(dst){
dst = dst || {};
dst.distance = this.distance;
dst.center = this.center.slice();
dst.rotation = this.rotation.slice();
return dst;
},
};
// backup-state at start
this.state_reset = this.state.copy();
// backup-state, probably not required
this.state_pushed = this.state.copy();
// viewport for the mouse-pointer [x,y,w,h]
this.viewport = args.viewport.slice();
// offset of the canvas in the container
this.offset = args.offset.slice();
// add a handler for window resizing
window.addEventListener('resize', function (e){
let p = renderer.elt.getBoundingClientRect();
cam.offset = [p.x + window.scrollX, p.y + window.scrollY];
});
// mouse/touch/key action handler
this.mouse = {
cam : cam,
curr : [0,0,0],
prev : [0,0,0],
dist : [0,0,0],
mwheel : 0,
isPressed : false, // true if (istouchdown || ismousedown)
istouchdown : false, // true, if input came from a touch
ismousedown : false, // true, if input came from a mouse
BUTTON : { LMB:0x01, MMB:0x02, RMB:0x04 },
button : 0,
mouseDragLeft : cam.mouseDragRotate.bind(cam),
mouseDragCenter : cam.mouseDragPan .bind(cam),
mouseDragRight : cam.mouseDragZoom .bind(cam),
mouseWheelAction: cam.mouseWheelZoom .bind(cam),
touchmoveSingle : cam.mouseDragRotate.bind(cam),
touchmoveMulti : function(){
cam.mouseDragPan();
cam.mouseDragZoom();
},
insideViewport : function(x, y){
var x0 = cam.viewport[0], x1 = x0 + cam.viewport[2];
var y0 = cam.viewport[1], y1 = y0 + cam.viewport[3];
return (x > x0) && (x < x1) && (y > y0) && (y < y1);
},
solveConstraint : function(){
var dx = this.dist[0];
var dy = this.dist[1];
// YAW, PITCH
if (this.shiftKey && !cam.SHIFT_CONSTRAINT && Math.abs(dx - dy) > 1) {
cam.SHIFT_CONSTRAINT = Math.abs(dx) > Math.abs(dy) ? cam.AXIS.YAW : cam.AXIS.PITCH;
}
// define constraint by increasing priority
cam.DRAG_CONSTRAINT = cam.AXIS.ALL;
if(cam.FIXED_CONSTRAINT) cam.DRAG_CONSTRAINT = cam.FIXED_CONSTRAINT;
if(cam.SHIFT_CONSTRAINT) cam.DRAG_CONSTRAINT = cam.SHIFT_CONSTRAINT;
},
updateInput : function(x,y,z){
var mouse = cam.mouse;
var pd = cam.P5.pixelDensity();
mouse.prev[0] = mouse.curr[0];
mouse.prev[1] = mouse.curr[1];
mouse.prev[2] = mouse.curr[2];
mouse.curr[0] = x;
mouse.curr[1] = y;
mouse.curr[2] = z;
mouse.dist[0] = -(mouse.curr[0] - mouse.prev[0]) / pd;
mouse.dist[1] = -(mouse.curr[1] - mouse.prev[1]) / pd;
mouse.dist[2] = -(mouse.curr[2] - mouse.prev[2]) / pd;
},
//////////////////////////////////////////////////////////////////////////
// mouseinput
//////////////////////////////////////////////////////////////////////////
mousedown : function(event){
var mouse = cam.mouse;
// Account for canvas shift:
var offX = cam.offset[0] - window.scrollX,
offY = cam.offset[1] - window.scrollY;
if(event.button === 0) mouse.button |= mouse.BUTTON.LMB;
if(event.button === 1) mouse.button |= mouse.BUTTON.MMB;
if(event.button === 2) mouse.button |= mouse.BUTTON.RMB;
if(mouse.insideViewport(event.x - offX, event.y - offY)){
mouse.updateInput(event.x - offX, event.y - offY, event.y - offY);
mouse.ismousedown = mouse.button > 0;
mouse.isPressed = mouse.ismousedown;
cam.SHIFT_CONSTRAINT = 0;
}
},
mousedrag : function(){
var pd = cam.P5.pixelDensity();
var mouse = cam.mouse;
if(mouse.ismousedown){
var x = cam.P5.mouseX;
var y = cam.P5.mouseY;
var z = y;
mouse.updateInput(x, y, z);
mouse.solveConstraint();
var LMB = mouse.button & mouse.BUTTON.LMB;
var MMB = mouse.button & mouse.BUTTON.MMB;
var RMB = mouse.button & mouse.BUTTON.RMB;
if(LMB && mouse.mouseDragLeft ) mouse.mouseDragLeft();
if(MMB && mouse.mouseDragCenter) mouse.mouseDragCenter();
if(RMB && mouse.mouseDragRight ) mouse.mouseDragRight();
}
},
mouseup : function(event){
var mouse = cam.mouse;
if(event.button === 0) mouse.button &= ~mouse.BUTTON.LMB;
if(event.button === 1) mouse.button &= ~mouse.BUTTON.MMB;
if(event.button === 2) mouse.button &= ~mouse.BUTTON.RMB;
mouse.ismousedown = mouse.button > 0;
mouse.isPressed = (mouse.istouchdown || mouse.ismousedown);
cam.SHIFT_CONSTRAINT = 0;
},
dblclick : function(event){
// Account for canvas shift:
var offX = cam.offset[0] - window.scrollX,
offY = cam.offset[1] - window.scrollY;
if(cam.mouse.insideViewport(event.x - offX, event.y - offY)){
cam.reset();
}
},
wheel : function(event){
// Account for canvas shift:
var offX = cam.offset[0] - window.scrollX,
offY = cam.offset[1] - window.scrollY,
mouse = cam.mouse;
if(mouse.insideViewport(event.x - offX, event.y - offY)){
mouse.mwheel = event.deltaY * 0.01;
if(mouse.mouseWheelAction) mouse.mouseWheelAction();
}
},
//////////////////////////////////////////////////////////////////////////
// touchinput
//////////////////////////////////////////////////////////////////////////
evaluateTouches : function(event){
var touches = event.touches;
var avg_x = 0.0;
var avg_y = 0.0;
var avg_d = 0.0;
var i, dx, dy, count = touches.length;
// Account for canvas shift:
var offX = cam.offset[0] - window.scrollX,
offY = cam.offset[1] - window.scrollY;
// center, averaged touch position
for(i = 0; i < count; i++){
avg_x += touches[i].clientX - offX;
avg_y += touches[i].clientY - offY;
}
avg_x /= count;
avg_y /= count;
// offset, mean distance to center
for(i = 0; i < count; i++){
dx = avg_x - (touches[i].clientX - offX);
dy = avg_y - (touches[i].clientY - offY);
avg_d += Math.sqrt(dx*dx + dy*dy);
}
avg_d /= count;
cam.mouse.updateInput(avg_x, avg_y, -avg_d);
},
touchstart : function(event){
event.preventDefault();
event.stopPropagation();
var mouse = cam.mouse;
mouse.evaluateTouches(event);
mouse.istouchdown = mouse.insideViewport(mouse.curr[0], mouse.curr[1]);
mouse.isPressed = (cam.mouse.istouchdown || cam.mouse.ismousedown);
mouse.dbltap(event);
},
touchmove : function(event){
event.preventDefault();
event.stopPropagation();
var mouse = cam.mouse;
if(mouse.istouchdown){
mouse.evaluateTouches(event);
mouse.solveConstraint();
if(event.touches.length === 1){
mouse.touchmoveSingle();
} else {
mouse.touchmoveMulti();
mouse.tapcount = 0;
}
}
},
touchend : function(event){
event.preventDefault();
event.stopPropagation();
var mouse = cam.mouse;
mouse.istouchdown = false,
mouse.isPressed = (mouse.istouchdown || mouse.ismousedown);
cam.SHIFT_CONSTRAINT = 0;
if(mouse.tapcount >= 2){
if(mouse.insideViewport(mouse.curr[0], mouse.curr[1])){
cam.reset();
}
mouse.tapcount = 0;
}
},
tapcount : 0,
dbltap : function(event) {
if(cam.mouse.tapcount++ == 0) {
setTimeout( function() {
cam.mouse.tapcount = 0;
}, 350 );
}
},
//////////////////////////////////////////////////////////////////////////
// keyingput
//////////////////////////////////////////////////////////////////////////
// key-event for shift constraints
shiftKey : false,
keydown : function(event){
var mouse = cam.mouse;
if(!mouse.shiftKey){
mouse.shiftKey = (event.keyCode === 16);
}
},
keyup : function(event){
var mouse = cam.mouse;
if(mouse.shiftKey){
mouse.shiftKey = (event.keyCode !== 16);
if(!mouse.shiftKey){
cam.SHIFT_CONSTRAINT = 0;
}
}
}
};
// camera mouse listeners
this.attachMouseListeners();
// P5 registered callbacks, TODO unregister on dispose
this.auto_update = true;
this.P5.registerMethod('pre', function(){
if(cam.auto_update){
cam.update();
}
});
// damped camera transition
this.dampedZoom = new DampedAction(function(d){ cam.zoom (d * cam.getZoomMult ()); } );
this.dampedPanX = new DampedAction(function(d){ cam.panX (d * cam.getPanMult ()); } );
this.dampedPanY = new DampedAction(function(d){ cam.panY (d * cam.getPanMult ()); } );
this.dampedRotX = new DampedAction(function(d){ cam.rotateX(d * cam.getRotationMult()); } );
this.dampedRotY = new DampedAction(function(d){ cam.rotateY(d * cam.getRotationMult()); } );
this.dampedRotZ = new DampedAction(function(d){ cam.rotateZ(d * cam.getRotationMult()); } );
// interpolated camera transition
this.timedRot = new Interpolation(cam.setInterpolatedRotation.bind(cam));
this.timedPan = new Interpolation(cam.setInterpolatedCenter .bind(cam));
this.timedzoom = new Interpolation(cam.setInterpolatedDistance.bind(cam));
}
/**
* sets the WEBGL renderer the camera is working on
*
* @param {p5.RendererGL} renderer ... p5 WEBGL renderer
*/
setCanvas(renderer){
if(renderer instanceof p5.RendererGL){
// p5js seems to be not very clear about this
// ... a bit confusing, so i guess this could change in future releases
this.renderer = renderer;
if(renderer._pInst instanceof p5){
this.graphics = renderer;
} else {
this.graphics = renderer._pInst;
}
this.P5 = this.graphics._pInst;
} else {
this.graphics = undefined;
this.renderer = undefined;
}
}
/** @return {p5.RendererGL} the currently used renderer */
getCanvas(){
return this.renderer;
}
attachListener(el, ev, fx, op){
if(!el || (el === fx.el)){
return;
}
this.detachListener(fx);
fx.el = el;
fx.ev = ev;
fx.op = op;
fx.el.addEventListener(fx.ev, fx, fx.op);
}
detachListener(fx){
if(fx.el) {
fx.el.removeEventListener(fx.ev, fx, fx.op);
fx.el = undefined;
}
}
/** attaches input-listeners (mouse, touch, key) to the used renderer */
attachMouseListeners(renderer){
var cam = this.cam;
var mouse = cam.mouse;
renderer = renderer || cam.renderer;
if(renderer){
var op = { passive:false };
var el = renderer.elt;
cam.attachListener(el , 'mousedown' , mouse.mousedown , op);
cam.attachListener(el , 'mouseup' , mouse.mouseup , op);
cam.attachListener(el , 'dblclick' , mouse.dblclick , op);
cam.attachListener(el , 'wheel' , mouse.wheel , op);
cam.attachListener(el , 'touchstart', mouse.touchstart, op);
cam.attachListener(el , 'touchend' , mouse.touchend , op);
cam.attachListener(el , 'touchmove' , mouse.touchmove , op);
cam.attachListener(window, 'keydown' , mouse.keydown , op);
cam.attachListener(window, 'keyup' , mouse.keyup , op);
}
}
/** detaches all attached input-listeners */
removeMouseListeners(){
var cam = this.cam;
var mouse = cam.mouse;
cam.detachListener(mouse.mousedown );
cam.detachListener(mouse.mouseup );
cam.detachListener(mouse.dblclick );
cam.detachListener(mouse.wheel );
cam.detachListener(mouse.keydown );
cam.detachListener(mouse.keyup );
cam.detachListener(mouse.touchstart);
cam.detachListener(mouse.touchend );
cam.detachListener(mouse.touchmove );
}
/** Disposes/releases the camera. */
dispose(){
// TODO: p5 unregister 'pre', ... not available in 0.5.16
removeMouseListeners();
}
/** @return {boolean} the current autoUpdate state */
getAutoUpdate(){
return this.auto_update;
}
/**
* If true, the EasyCam will update automatically in a pre-draw step.
* This updates the camera state and updates the renderers
* modelview/camera matrix.
*
* If false, the update() needs to be called manually.
*
* @param {boolean} the new autoUpdate state
*/
setAutoUpdate(status){
this.auto_update = status;
}
/**
* Updates the camera state (interpolated / damped animations) and updates
* the renderers' modelview/camera matrix.
*
* if "auto_update" is true, this is called automatically in a pre-draw call.
*/
update(){
var cam = this.cam;
var mouse = cam.mouse;
mouse.mousedrag();
var b_update = false;
b_update |= cam.dampedZoom.update();
b_update |= cam.dampedPanX.update();
b_update |= cam.dampedPanY.update();
b_update |= cam.dampedRotX.update();
b_update |= cam.dampedRotY.update();
b_update |= cam.dampedRotZ.update();
// interpolated actions have lower priority then damped actions
if(b_update){
cam.timedRot .stop();
cam.timedPan .stop();
cam.timedzoom.stop();
} else {
cam.timedRot .update();
cam.timedPan .update();
cam.timedzoom.update();
}
cam.apply();
}
/**
* Applies the current camera state to the renderers' modelview/camera matrix.
* If no argument is given, then the cameras currently set renderer is used.
*/
apply(renderer) {
var cam = this.cam;
renderer = renderer || cam.renderer;
if(renderer){
this.camEYE = this.getPosition(this.camEYE);
this.camLAT = this.getCenter (this.camLAT);
this.camRUP = this.getUpVector(this.camRUP);
if(undefined===renderer._curCamera)
renderer.camera(this.camEYE[0], this.camEYE[1], this.camEYE[2],
this.camLAT[0], this.camLAT[1], this.camLAT[2],
this.camRUP[0], this.camRUP[1], this.camRUP[2]);
else
renderer._curCamera.camera(this.camEYE[0], this.camEYE[1], this.camEYE[2],
this.camLAT[0], this.camLAT[1], this.camLAT[2],
this.camRUP[0], this.camRUP[1], this.camRUP[2]);
}
}
/** @param {int[]} the new viewport-def, as [x,y,w,h] */
setViewport(viewport){
this.viewport = viewport.slice();
}
/** @returns {int[]} the current viewport-def, as [x,y,w,h] */
getViewport(){
return this.viewport;
}
//
// mouse state changes
//
/** implemented zoom-cb for mouswheel handler.*/
mouseWheelZoom() {
var cam = this;
var mouse = cam.mouse;
cam.dampedZoom.addForce(mouse.mwheel * cam.scale_zoomwheel);
}
/** implemented zoom-cb for mousedrag/touch handler.*/
mouseDragZoom() {
var cam = this;
var mouse = cam.mouse;
cam.dampedZoom.addForce(-mouse.dist[2]);
}
/** implemented pan-cb for mousedrag/touch handler.*/
mouseDragPan() {
var cam = this;
var mouse = cam.mouse;
cam.dampedPanX.addForce((cam.DRAG_CONSTRAINT & cam.AXIS.YAW ) ? mouse.dist[0] : 0);
cam.dampedPanY.addForce((cam.DRAG_CONSTRAINT & cam.AXIS.PITCH) ? mouse.dist[1] : 0);
}
/** implemented rotate-cb for mousedrag/touch handler.*/
mouseDragRotate() {
var cam = this;
var mouse = cam.mouse;
var mx = mouse.curr[0], my = mouse.curr[1];
var dx = mouse.dist[0], dy = mouse.dist[1];
// mouse [-1, +1]
var mxNdc = Math.min(Math.max((mx - cam.viewport[0]) / cam.viewport[2], 0), 1) * 2 - 1;
var myNdc = Math.min(Math.max((my - cam.viewport[1]) / cam.viewport[3], 0), 1) * 2 - 1;
if (cam.DRAG_CONSTRAINT & cam.AXIS.YAW) {
cam.dampedRotY.addForce(+dx * (1.0 - myNdc * myNdc));
}
if (cam.DRAG_CONSTRAINT & cam.AXIS.PITCH) {
cam.dampedRotX.addForce(-dy * (1.0 - mxNdc * mxNdc));
}
if (cam.DRAG_CONSTRAINT & cam.AXIS.ROLL) {
cam.dampedRotZ.addForce(-dx * myNdc);
cam.dampedRotZ.addForce(+dy * mxNdc);
}
}
//
// damped multipliers
//
/** (private) returns the used zoom -multiplier for damped actions. */
getZoomMult(){
return this.state.distance * this.scale_zoom;
}
/** (private) returns the used pan-multiplier for damped actions. */
getPanMult(){
return this.state.distance * this.scale_pan;
}
/** (private) returns the used rotate-multiplier for damped actions. */
getRotationMult(){
return Math.pow(Math.log10(1 + this.state.distance), 0.5) * this.scale_rotation;
}
//
// damped state changes
//
/** Applies a change to the current zoom. */
zoom(dz){
var cam = this.cam;
var distance_tmp = cam.state.distance + dz;
// check lower bound
if(distance_tmp < cam.distance_min) {
distance_tmp = cam.distance_min;
cam.dampedZoom.stop();
}
// check upper bound
if(distance_tmp > cam.distance_max) {
distance_tmp = cam.distance_max;
cam.dampedZoom.stop();
}
cam.state.distance = distance_tmp;
}
/** Applies a change to the current pan-xValue. */
panX(dx) {
var state = this.cam.state;
if(dx) {
var val = Rotation.applyToVec3(state.rotation, [dx, 0, 0]);
Vec3.add(state.center, val, state.center);
}
}
/** Applies a change to the current pan-yValue. */
panY(dy) {
var state = this.cam.state;
if(dy) {
var val = Rotation.applyToVec3(state.rotation, [0, dy, 0]);
Vec3.add(state.center, val, state.center);
}
}
/** Applies a change to the current pan-value. */
pan(dx, dy) {
this.cam.panX(dx);
this.cam.panY(dx);
}
/** Applies a change to the current xRotation. */
rotateX(rx) {
this.cam.rotate([1,0,0], rx);
}
/** Applies a change to the current yRotation. */
rotateY(ry) {
this.cam.rotate([0,1,0], ry);
}
/** Applies a change to the current zRotation. */
rotateZ(rz) {
this.cam.rotate([0,0,1], rz);
}
/** Applies a change to the current rotation, using the given axis/angle. */
rotate(axis, angle) {
var state = this.cam.state;
if(angle) {
var new_rotation = Rotation.create({axis:axis, angle:angle});
Rotation.applyToRotation(state.rotation, new_rotation, state.rotation);
}
}
//
// interpolated states
//
/** Sets the new camera-distance, interpolated (t) between given A and B. */
setInterpolatedDistance(valA, valB, t) {
this.cam.state.distance = Scalar.mix(valA, valB, Scalar.smoothstep(t));
}
/** Sets the new camera-center, interpolated (t) between given A and B. */
setInterpolatedCenter(valA, valB, t) {
this.cam.state.center = Vec3.mix(valA, valB, Scalar.smoothstep(t));
}
/** Sets the new camera-rotation, interpolated (t) between given A and B. */
setInterpolatedRotation(valA, valB, t) {
this.cam.state.rotation = Rotation.slerp(valA, valB, t);
}
//
// DISTANCE
//
/** Sets the minimum camera distance. */
setDistanceMin(distance_min) {
this.distance_min = Math.max(distance_min, this.distance_min_limit);
this.zoom(0); // update, to ensure new minimum
}
/** Sets the maximum camera distance. */
setDistanceMax(distance_max) {
this.distance_max = distance_max;
this.zoom(0); // update, to ensure new maximum
}
/**
* Sets the new camera distance.
*
* @param {double} distance new distance.
* @param {long} duration animation time in millis.
*/
setDistance(distance, duration) {
this.timedzoom.start(this.state.distance, distance, duration, [this.dampedZoom]);
}
/** @returns {double} the current camera distance. */
getDistance() {
return this.state.distance;
}
//
// CENTER / LOOK AT
//
/**
* Sets the new camera center.
*
* @param {double[]} center new center.
* @param {long} duration animation time in millis.
*/
setCenter(center, duration) {
this.timedPan.start(this.state.center, center, duration, [this.dampedPanX, this.dampedPanY]);
}
/** @returns {double[]} the current camera center. */
getCenter() {
return this.state.center;
}
//
// ROTATION
//
/**
* Sets the new camera rotation (quaternion).
*
* @param {double[]} rotation new rotation as quat[q0,q1,q2,q3].
* @param {long} duration animation time in millis.
*/
setRotation(rotation, duration) {
this.timedRot.start(this.state.rotation, rotation, duration, [this.dampedRotX, this.dampedRotY, this.dampedRotZ]);
}
/** @returns {double[]} the current camera rotation as quat[q0,q1,q2,q3]. */
getRotation() {
return this.state.rotation;
}
//
// CAMERA POSITION/EYE
//
/** @returns {double[]} the current camera position, aka. the eye position. */
getPosition(dst) {
var cam = this.cam;
var state = cam.state;
dst = Vec3.assert(dst);
Rotation.applyToVec3(state.rotation, cam.LOOK, dst);
Vec3.mult(dst, state.distance, dst);
Vec3.add(dst, state.center, dst);
return dst;
}
//
// CAMERA UP
//
/** @returns {double[]} the current camera up vector. */
getUpVector(dst) {
var cam = this.cam;
var state = cam.state;
dst = Vec3.assert(dst);
Rotation.applyToVec3(state.rotation, cam.UP, dst);
return dst;
}
//
// STATE (rotation, center, distance)
//
/** @returns {Object} a copy of the camera state {distance,center,rotation} */
getState() {
return this.state.copy();
}
/**
* @param {Object} a new camera state {distance,center,rotation}.
* @param {long} animation time in millis.
*/
setState(other, duration) {
if(other){
this.setDistance(other.distance, duration);
this.setCenter (other.center , duration);
this.setRotation(other.rotation, duration);
}
}
pushState(){
return (this.state_pushed = this.getState());
}
popState(duration){
this.setState(this.state_pushed, duration);
}
/** sets the current state as reset-state. */
pushResetState(){
return (this.state_reset = this.getState());
}
/** resets the camera, by applying the reset-state. */
reset(duration){
this.setState(this.state_reset, duration);
}
/** sets the rotation scale/speed. */
setRotationScale(scale_rotation){
this.scale_rotation = scale_rotation;
}
/** sets the pan scale/speed. */
setPanScale(scale_pan){
this.scale_pan = scale_pan;
}
/** sets the zoom scale/speed. */
setZoomScale(scale_zoom){
this.scale_zoom = scale_zoom;
}
/** sets the wheel scale/speed. */
setWheelScale(wheelScale) {
this.scale_zoomwheel = wheelScale;
}
/** @returns the rotation scale/speed. */
getRotationScale(){
return this.scale_rotation;
}
/** @returns the pan scale/speed. */
getPanScale() {
return this.scale_pan;
}
/** @returns the zoom scale/speed. */
getZoomScale() {
return this.scale_zoom;
}
/** @returns the wheel scale/speed. */
getWheelScale() {
return this.scale_zoomwheel;
}
/** sets the default damping scale/speed. */
setDamping(damping) {
this.dampedZoom.damping = damping;
this.dampedPanX.damping = damping;
this.dampedPanY.damping = damping;
this.dampedRotX.damping = damping;
this.dampedRotY.damping = damping;