web2019/static/js/SolveSpaceControls.js

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JavaScript
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2019-07-18 21:44:38 +08:00
window.devicePixelRatio = window.devicePixelRatio || 1;
SolvespaceCamera = function(renderWidth, renderHeight, scale, up, right, offset) {
THREE.Camera.call(this);
this.type = 'SolvespaceCamera';
this.renderWidth = renderWidth;
this.renderHeight = renderHeight;
this.zoomScale = scale; /* Avoid namespace collision w/ THREE.Object.scale */
this.up = up;
this.right = right;
this.offset = offset;
this.depthBias = 0;
this.updateProjectionMatrix();
};
SolvespaceCamera.prototype = Object.create(THREE.Camera.prototype);
SolvespaceCamera.prototype.constructor = SolvespaceCamera;
SolvespaceCamera.prototype.updateProjectionMatrix = function() {
var temp = new THREE.Matrix4();
var offset = new THREE.Matrix4().makeTranslation(this.offset.x, this.offset.y, this.offset.z);
// Convert to right handed- do up cross right instead.
var n = new THREE.Vector3().crossVectors(this.up, this.right);
var rotate = new THREE.Matrix4().makeBasis(this.right, this.up, n);
rotate.transpose();
/* FIXME: At some point we ended up using row-major.
THREE.js wants column major. Scale/depth correct unaffected b/c diagonal
matrices remain the same when transposed. makeTranslation also makes
a column-major matrix. */
/* TODO: If we want perspective, we need an additional matrix
here which will modify w for perspective divide. */
var scale = new THREE.Matrix4().makeScale(2 * this.zoomScale / this.renderWidth,
2 * this.zoomScale / this.renderHeight, this.zoomScale / 30000.0);
temp.multiply(scale);
temp.multiply(rotate);
temp.multiply(offset);
this.projectionMatrix.copy(temp);
};
SolvespaceCamera.prototype.NormalizeProjectionVectors = function() {
/* After rotating, up and right may no longer be orthogonal.
However, their cross product will produce the correct
rotated plane, and we can recover an orthogonal basis. */
var n = new THREE.Vector3().crossVectors(this.right, this.up);
this.up = new THREE.Vector3().crossVectors(n, this.right);
this.right.normalize();
this.up.normalize();
};
SolvespaceCamera.prototype.rotate = function(right, up) {
var oldRight = new THREE.Vector3().copy(this.right).normalize();
var oldUp = new THREE.Vector3().copy(this.up).normalize();
this.up.applyAxisAngle(oldRight, up);
this.right.applyAxisAngle(oldUp, right);
this.NormalizeProjectionVectors();
}
SolvespaceCamera.prototype.offsetProj = function(right, up) {
var shift = new THREE.Vector3(right * this.right.x + up * this.up.x,
right * this.right.y + up * this.up.y,
right * this.right.z + up * this.up.z);
this.offset.add(shift);
}
/* Calculate the offset in terms of up and right projection vectors
that will preserve the world coordinates of the current mouse position after
the zoom. */
SolvespaceCamera.prototype.zoomTo = function(x, y, delta) {
// Get offset components in world coordinates, in terms of up/right.
var projOffsetX = this.offset.dot(this.right);
var projOffsetY = this.offset.dot(this.up);
/* Remove offset before scaling so, that mouse position changes
proportionally to the model and independent of current offset. */
var centerRightI = x/this.zoomScale - projOffsetX;
var centerUpI = y/this.zoomScale - projOffsetY;
var zoomFactor;
/* Zoom 20% every 100 delta. */
if(delta < 0) {
zoomFactor = (-delta * 0.002 + 1);
}
else if(delta > 0) {
zoomFactor = (delta * (-1.0/600.0) + 1)
}
else {
return;
}
this.zoomScale = this.zoomScale * zoomFactor;
var centerRightF = x/this.zoomScale - projOffsetX;
var centerUpF = y/this.zoomScale - projOffsetY;
this.offset.addScaledVector(this.right, centerRightF - centerRightI);
this.offset.addScaledVector(this.up, centerUpF - centerUpI);
}
SolvespaceControls = function(object, domElement) {
var _this = this;
this.object = object;
this.domElement = ( domElement !== undefined ) ? domElement : document;
var threePan = new Hammer.Pan({event : 'threepan', pointers : 3, enable : false});
var panAfterTap = new Hammer.Pan({event : 'panaftertap', enable : false});
this.touchControls = new Hammer.Manager(domElement, {
recognizers: [
[Hammer.Pinch, { enable: true }],
[Hammer.Pan],
[Hammer.Tap],
]
});
this.touchControls.add(threePan);
this.touchControls.add(panAfterTap);
var changeEvent = {
type: 'change'
};
var startEvent = {
type: 'start'
};
var endEvent = {
type: 'end'
};
var _changed = false;
var _mouseMoved = false;
//var _touchPoints = new Array();
var _offsetPrev = new THREE.Vector2(0, 0);
var _offsetCur = new THREE.Vector2(0, 0);
var _rotatePrev = new THREE.Vector2(0, 0);
var _rotateCur = new THREE.Vector2(0, 0);
// Used during touch events.
var _rotateOrig = new THREE.Vector2(0, 0);
var _offsetOrig = new THREE.Vector2(0, 0);
var _prevScale = 1.0;
this.handleEvent = function(event) {
if (typeof this[event.type] == 'function') {
this[event.type](event);
}
}
function mousedown(event) {
event.preventDefault();
event.stopPropagation();
switch (event.button) {
case 0:
_rotateCur.set(event.screenX/window.devicePixelRatio, event.screenY/window.devicePixelRatio);
_rotatePrev.copy(_rotateCur);
document.addEventListener('mousemove', mousemove, false);
document.addEventListener('mouseup', mouseup, false);
break;
case 2:
_offsetCur.set(event.screenX/window.devicePixelRatio, event.screenY/window.devicePixelRatio);
_offsetPrev.copy(_offsetCur);
document.addEventListener('mousemove', mousemove, false);
document.addEventListener('mouseup', mouseup, false);
break;
default:
break;
}
}
function wheel( event ) {
event.preventDefault();
/* FIXME: Width and height might not be supported universally, but
can be calculated? */
var box = _this.domElement.getBoundingClientRect();
object.zoomTo(event.clientX - box.width/2 - box.left,
-(event.clientY - box.height/2 - box.top), event.deltaY);
_changed = true;
}
function mousemove(event) {
switch (event.button) {
case 0:
_rotateCur.set(event.screenX/window.devicePixelRatio, event.screenY/window.devicePixelRatio);
var diff = new THREE.Vector2().subVectors(_rotateCur, _rotatePrev)
.multiplyScalar(1 / object.zoomScale);
object.rotate(-0.3 * Math.PI / 180 * diff.x * object.zoomScale,
-0.3 * Math.PI / 180 * diff.y * object.zoomScale);
_changed = true;
_rotatePrev.copy(_rotateCur);
break;
case 2:
_mouseMoved = true;
_offsetCur.set(event.screenX/window.devicePixelRatio, event.screenY/window.devicePixelRatio);
var diff = new THREE.Vector2().subVectors(_offsetCur, _offsetPrev)
.multiplyScalar(1 / object.zoomScale);
object.offsetProj(diff.x, -diff.y);
_changed = true;
_offsetPrev.copy(_offsetCur)
break;
}
}
function mouseup(event) {
/* TODO: Opera mouse gestures will intercept this event, making it
possible to have multiple mousedown events consecutively without
a corresponding mouseup (so multiple viewports can be rotated/panned
simultaneously). Disable mouse gestures for now. */
event.preventDefault();
event.stopPropagation();
document.removeEventListener('mousemove', mousemove);
document.removeEventListener('mouseup', mouseup);
_this.dispatchEvent(endEvent);
}
function pan(event) {
/* neWcur - prev does not necessarily equal (cur + diff) - prev.
Floating point is not associative. */
touchDiff = new THREE.Vector2(event.deltaX, event.deltaY);
_rotateCur.addVectors(_rotateOrig, touchDiff);
incDiff = new THREE.Vector2().subVectors(_rotateCur, _rotatePrev)
.multiplyScalar(1 / object.zoomScale);
object.rotate(-0.3 * Math.PI / 180 * incDiff.x * object.zoomScale,
-0.3 * Math.PI / 180 * incDiff.y * object.zoomScale);
_changed = true;
_rotatePrev.copy(_rotateCur);
}
function panstart(event) {
/* TODO: Dynamically enable pan function? */
_rotateOrig.copy(_rotateCur);
}
function pinchstart(event) {
_prevScale = event.scale;
}
function pinch(event) {
/* FIXME: Width and height might not be supported universally, but
can be calculated? */
var box = _this.domElement.getBoundingClientRect();
/* 16.6... pixels chosen heuristically... matches my touchpad. */
if (event.scale < _prevScale) {
object.zoomTo(event.center.x - box.width/2 - box.left,
-(event.center.y - box.height/2 - box.top), 100/6.0);
_changed = true;
} else if (event.scale > _prevScale) {
object.zoomTo(event.center.x - box.width/2 - box.left,
-(event.center.y - box.height/2 - box.top), -100/6.0);
_changed = true;
}
_prevScale = event.scale;
}
/* A tap will enable panning/disable rotate. */
function tap(event) {
panAfterTap.set({enable : true});
_this.touchControls.get('pan').set({enable : false});
}
function panaftertap(event) {
touchDiff = new THREE.Vector2(event.deltaX, event.deltaY);
_offsetCur.addVectors(_offsetOrig, touchDiff);
incDiff = new THREE.Vector2().subVectors(_offsetCur, _offsetPrev)
.multiplyScalar(1 / object.zoomScale);
object.offsetProj(incDiff.x, -incDiff.y);
_changed = true;
_offsetPrev.copy(_offsetCur);
}
function panaftertapstart(event) {
_offsetOrig.copy(_offsetCur);
}
function panaftertapend(event) {
panAfterTap.set({enable : false});
_this.touchControls.get('pan').set({enable : true});
}
function contextmenu(event) {
event.preventDefault();
}
this.update = function() {
if (_changed) {
_this.dispatchEvent(changeEvent);
_changed = false;
}
}
this.domElement.addEventListener('mousedown', mousedown, false);
this.domElement.addEventListener('wheel', wheel, false);
this.domElement.addEventListener('contextmenu', contextmenu, false);
/* Hammer.on wraps addEventListener */
// Rotate
this.touchControls.on('pan', pan);
this.touchControls.on('panstart', panstart);
// Zoom
this.touchControls.on('pinch', pinch);
this.touchControls.on('pinchstart', pinchstart);
//Pan
this.touchControls.on('tap', tap);
this.touchControls.on('panaftertapstart', panaftertapstart);
this.touchControls.on('panaftertap', panaftertap);
this.touchControls.on('panaftertapend', panaftertapend);
}
SolvespaceControls.prototype = Object.create(THREE.EventDispatcher.prototype);
SolvespaceControls.prototype.constructor = SolvespaceControls;
solvespace = function(obj, params) {
var scene, edgeScene, camera, edgeCamera, renderer;
var geometry, controls, material, mesh, edges;
var width, height, scale, offset;
var directionalLightArray = [];
if (typeof params === "undefined" || !("width" in params)) {
width = window.innerWidth;
} else {
width = params.width;
}
if (typeof params === "undefined" || !("height" in params)) {
height = window.innerHeight;
} else {
height = params.height;
}
if (typeof params === "undefined" || !("scale" in params)) {
scale = 5;
} else {
scale = params.scale;
}
if (typeof params === "undefined" || !("offset" in params)) {
offset = new THREE.Vector3(0, 0, 0);
} else {
offset = params.offset;
}
width *= window.devicePixelRatio;
height *= window.devicePixelRatio;
domElement = init();
render();
return domElement;
function init() {
scene = new THREE.Scene();
edgeScene = new THREE.Scene();
camera = new SolvespaceCamera(width/window.devicePixelRatio,
height/window.devicePixelRatio, scale, new THREE.Vector3(0, 1, 0),
new THREE.Vector3(0.5, 0, -0.5).normalize(), offset);
mesh = createMesh(obj);
scene.add(mesh);
edges = createEdges(obj);
edgeScene.add(edges);
for (var i = 0; i < obj.lights.d.length; i++) {
var lightColor = new THREE.Color(obj.lights.d[i].intensity,
obj.lights.d[i].intensity, obj.lights.d[i].intensity);
var directionalLight = new THREE.DirectionalLight(lightColor, 1);
directionalLight.position.set(obj.lights.d[i].direction[0],
obj.lights.d[i].direction[1], obj.lights.d[i].direction[2]);
directionalLightArray.push(directionalLight);
scene.add(directionalLight);
}
var lightColor = new THREE.Color(obj.lights.a, obj.lights.a, obj.lights.a);
var ambientLight = new THREE.AmbientLight(lightColor.getHex());
scene.add(ambientLight);
renderer = new THREE.WebGLRenderer({ antialias: true});
renderer.setSize(width, height);
renderer.autoClear = false;
renderer.domElement.style = "width:"+width/window.devicePixelRatio+"px;height:"+height/window.devicePixelRatio+"px;";
controls = new SolvespaceControls(camera, renderer.domElement);
controls.addEventListener("change", render);
controls.addEventListener("change", lightUpdate);
animate();
return renderer.domElement;
}
function animate() {
requestAnimationFrame(animate);
controls.update();
}
function render() {
var context = renderer.getContext();
camera.updateProjectionMatrix();
renderer.clear();
context.depthRange(0.1, 1);
renderer.render(scene, camera);
context.depthRange(0.1-(2/60000.0), 1-(2/60000.0));
renderer.render(edgeScene, camera);
}
function lightUpdate() {
var changeBasis = new THREE.Matrix4();
// The original light positions were in camera space.
// Project them into standard space using camera's basis
// vectors (up, target, and their cross product).
n = new THREE.Vector3().crossVectors(camera.up, camera.right);
changeBasis.makeBasis(camera.right, camera.up, n);
for (var i = 0; i < 2; i++) {
var newLightPos = changeBasis.applyToVector3Array(
[obj.lights.d[i].direction[0], obj.lights.d[i].direction[1],
obj.lights.d[i].direction[2]]);
directionalLightArray[i].position.set(newLightPos[0],
newLightPos[1], newLightPos[2]);
}
}
function createMesh(meshObj) {
var geometry = new THREE.Geometry();
var materialIndex = 0;
var materialList = [];
var opacitiesSeen = {};
for (var i = 0; i < meshObj.points.length; i++) {
geometry.vertices.push(new THREE.Vector3(meshObj.points[i][0],
meshObj.points[i][1], meshObj.points[i][2]));
}
for (var i = 0; i < meshObj.faces.length; i++) {
var currOpacity = ((meshObj.colors[i] & 0xFF000000) >>> 24) / 255.0;
if (opacitiesSeen[currOpacity] === undefined) {
opacitiesSeen[currOpacity] = materialIndex;
materialIndex++;
materialList.push(new THREE.MeshLambertMaterial({
vertexColors: THREE.FaceColors,
opacity: currOpacity,
transparent: true,
side: THREE.DoubleSide
}));
}
geometry.faces.push(new THREE.Face3(meshObj.faces[i][0],
meshObj.faces[i][1], meshObj.faces[i][2],
[new THREE.Vector3(meshObj.normals[i][0][0],
meshObj.normals[i][0][1], meshObj.normals[i][0][2]),
new THREE.Vector3(meshObj.normals[i][1][0],
meshObj.normals[i][1][1], meshObj.normals[i][1][2]),
new THREE.Vector3(meshObj.normals[i][2][0],
meshObj.normals[i][2][1], meshObj.normals[i][2][2])],
new THREE.Color(meshObj.colors[i] & 0x00FFFFFF),
opacitiesSeen[currOpacity]));
}
geometry.computeBoundingSphere();
return new THREE.Mesh(geometry, new THREE.MultiMaterial(materialList));
}
function createEdges(meshObj) {
var geometry = new THREE.Geometry();
var material = new THREE.LineBasicMaterial();
for (var i = 0; i < meshObj.edges.length; i++) {
geometry.vertices.push(new THREE.Vector3(meshObj.edges[i][0][0],
meshObj.edges[i][0][1], meshObj.edges[i][0][2]),
new THREE.Vector3(meshObj.edges[i][1][0],
meshObj.edges[i][1][1], meshObj.edges[i][1][2]));
}
geometry.computeBoundingSphere();
return new THREE.LineSegments(geometry, material);
}
};