@xeokit/xeokit-sdk
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3D BIM IFC Viewer SDK for AEC engineering applications. Open Source JavaScript Toolkit based on pure WebGL for top performance, real-world coordinates and full double precision
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JavaScript
import {Dot} from "../html/Dot.js";
import {Label} from "../html/Label.js";
import {Wire} from "../html/Wire.js";
import {math} from "../../../viewer/scene/math/math.js";
import {Marker} from "../../../viewer/scene/marker/Marker.js";
const tmpVec2a = math.vec2();
const tmpVec2b = math.vec2();
const tmpVec2c = math.vec2();
const tmpVec2d = math.vec2();
const tmpVec3a = math.vec3();
const tmpVec3b = math.vec3();
const tmpVec4a = math.vec4();
const tmpVec4b = math.vec4();
const tmpVec4c = math.vec4();
const tmpVec4d = math.vec4();
const tmpMat4 = math.mat4();
const tmpRay = {
origin: math.vec3(),
direction: math.vec3()
};
const nop = () => { };
const planeIntersect = function(p0, n, origin, direction) {
const t = (p0 - math.dotVec3(origin, n)) / math.dotVec3(direction, n);
if (t < 0)
{
return null;
}
else
{
const worldPos = math.vec3();
math.mulVec3Scalar(direction, t, worldPos);
math.addVec3(origin, worldPos, worldPos);
return worldPos;
}
};
export function transformToNode(from, to, vec) {
const fromRec = from.getBoundingClientRect();
const toRec = to.getBoundingClientRect();
vec[0] += fromRec.left - toRec.left;
vec[1] += fromRec.top - toRec.top;
};
const toClipSpace = (camera, worldPos, p) => {
// The reason the projMatrix is explicitely fetched as below is a complex callback chain
// leading from a boundary update to a viewMatrix and projMatrix updates, which change their values
// in the mid of the toClipSpace, leading to incorrect values.
// The fetch ensures that matrix values are stabilized before used to transform worldPos to p.
// Better solution would be to ensure that no mutually-triggered callbacks
// (like boundary => view/projMatrix in this situation) ever happen, so user code can rely
// on a callback running in a stable context.
tmpMat4.set(camera.viewMatrix);
tmpMat4.set(camera.projMatrix);
// to homogeneous coords
p.set(worldPos);
p[3] = 1;
// to clip space
math.mulMat4v4(camera.viewMatrix, p, p);
math.mulMat4v4(camera.projMatrix, p, p);
};
const toCanvasSpace = (canvas, parentElement, ndc, p) => {
p[0] = (1 + ndc[0]) * 0.5 * canvas.offsetWidth;
p[1] = (1 - ndc[1]) * 0.5 * canvas.offsetHeight;
transformToNode(canvas, parentElement, p);
};
const clipSegment = (scene, parentElement, start, end, canvasStart, canvasEnd) => {
const camera = scene.camera;
const canvas = scene.canvas.canvas;
if (math.distVec3(start, end) < 0.001) {
return false;
}
const delta = math.subVec3(end, start, tmpVec3a);
let s_min = 0.0;
let s_max = 1.0;
for (let plane of scene._sectionPlanesState.sectionPlanes) {
const endDot = math.dotVec3(plane.dir, math.subVec3(plane.pos, end, tmpVec3b));
const startDot = math.dotVec3(plane.dir, math.subVec3(plane.pos, start, tmpVec3b));
if ((startDot > 0) && (endDot > 0)) {
return false;
} else if ((startDot > 0) || (endDot > 0)) {
const denom = math.dotVec3(plane.dir, delta);
if (Math.abs(denom) >= 1e-6) {
const ratio = math.dotVec3(plane.dir, tmpVec3b) / denom;
if (startDot > 0) {
s_min = Math.max(s_min, ratio);
} else {
s_max = Math.min(s_max, ratio);
}
}
}
}
const p0 = tmpVec4a;
const p1 = tmpVec4b;
toClipSpace(camera, (s_min > 0) ? math.addVec3(start, math.mulVec3Scalar(delta, s_min, tmpVec3b), tmpVec3b) : start, p0);
toClipSpace(camera, (s_max < 1) ? math.addVec3(start, math.mulVec3Scalar(delta, s_max, tmpVec3b), tmpVec3b) : end, p1);
const p0Behind = ((p0[2] / p0[3]) < -1) || (p0[3] < 0);
const p1Behind = ((p1[2] / p1[3]) < -1) || (p1[3] < 0);
if (p0Behind && p1Behind) {
return false;
}
const t = (p0[3] + p0[2]) / ((p0[3] + p0[2]) - (p1[3] + p1[2]));
if ((t > 0) && (t < 1)) { //p0Behind || p1Behind) {
// Find the intersection of a segment with the near plane in clip space, if it exists."""
// Calculate the interpolation factor t where the line segment crosses the near plane
const delta = math.subVec4(p1, p0, tmpVec4c);
math.mulVec4Scalar(delta, t, delta);
math.addVec4(p0, delta, p0Behind ? p0 : p1);
}
// normalize clip space coords
math.mulVec4Scalar(p0, 1.0 / p0[3]);
math.mulVec4Scalar(p1, 1.0 / p1[3]);
let t_min = 0.0;
let t_max = 1.0;
// If either point is outside the view frustum, clip the line segment
for (let i = 0; i < 2; ++i) {
const denom = p1[i] - p0[i];
const l = (-1 - p0[i]) / denom;
const r = ( 1 - p0[i]) / denom;
if (denom > 0) {
t_min = Math.max(t_min, l);
t_max = Math.min(t_max, r);
} else if (denom < 0) {
t_min = Math.max(t_min, r);
t_max = Math.min(t_max, l);
} else {
if (p0[0] < -1) {
t_min = -window.Infinity;
} else if (p0[0] > 1) {
t_max = window.Infinity;
}
}
}
if (t_min >= t_max) {
return false;
}
// Calculate the clipped start and end points
const ndcDelta = math.subVec4(p1, p0, tmpVec4c);
math.addVec4(p0, math.mulVec4Scalar(ndcDelta, t_max, tmpVec4d), p1);
math.addVec4(p0, math.mulVec4Scalar(ndcDelta, t_min, tmpVec4d), p0);
math.mulVec4Scalar(p0, 1 / p0[3]);
math.mulVec4Scalar(p1, 1 / p1[3]);
toCanvasSpace(canvas, parentElement, p0, canvasStart);
toCanvasSpace(canvas, parentElement, p1, canvasEnd);
return true;
};
export class Dot3D extends Marker {
constructor(scene, markerCfg, parentElement, cfg = {}) {
const camera = scene.camera;
super(scene, markerCfg);
this.__visible = true; // "__" to not interfere with Marker::_visible
const handler = (cfgEvent, componentEvent) => {
return event => {
if (cfgEvent) {
cfgEvent(event);
}
this.fire(componentEvent, event, true);
};
};
this._dot = new Dot(parentElement, {
borderColor: cfg.borderColor,
fillColor: cfg.fillColor,
zIndex: cfg.zIndex,
onMouseOver: handler(cfg.onMouseOver, "mouseover"),
onMouseLeave: handler(cfg.onMouseLeave, "mouseleave"),
onMouseWheel: handler(cfg.onMouseWheel, "wheel"),
onMouseDown: handler(cfg.onMouseDown, "mousedown"),
onMouseUp: handler(cfg.onMouseUp, "mouseup"),
onMouseMove: handler(cfg.onMouseMove, "mousemove"),
onTouchstart: handler(cfg.onTouchstart, "touchstart"),
onTouchmove: handler(cfg.onTouchmove, "touchmove"),
onTouchend: handler(cfg.onTouchend, "touchend"),
onContextMenu: handler(cfg.onContextMenu, "contextmenu")
});
const toClipSpace = (worldPos, p) => {
// to homogeneous coords
p.set(worldPos);
p[3] = 1;
// to clip space
math.mulMat4v4(camera.viewMatrix, p, p);
math.mulMat4v4(camera.projMatrix, p, p);
};
const toCanvasSpace = ndc => {
const canvas = scene.canvas.canvas;
ndc[0] = (1 + ndc[0]) * 0.5 * canvas.offsetWidth;
ndc[1] = (1 - ndc[1]) * 0.5 * canvas.offsetHeight;
transformToNode(canvas, parentElement, ndc);
};
const updateDotPos = () => {
if (! this.__visible) {
return;
}
const p0 = tmpVec4c;
toClipSpace(this.worldPos, p0);
math.mulVec3Scalar(p0, 1.0 / p0[3]);
const outsideFrustum = ((p0[3] < 0)
||
(p0[0] < -1) || (p0[0] > 1)
||
(p0[1] < -1) || (p0[1] > 1)
||
(p0[2] < -1) || (p0[2] > 1));
const culled = outsideFrustum || scene._sectionPlanesState.sectionPlanes.some(
plane => (math.dotVec3(plane.dir, math.subVec3(plane.pos, this.worldPos, tmpVec3a)) > 0));
this._dot.setCulled(culled);
if (!culled) {
toCanvasSpace(p0);
this._dot.setPos(p0[0], p0[1]);
}
};
this.on("worldPos", updateDotPos);
const onViewMatrix = camera.on("viewMatrix", updateDotPos);
const onProjMatrix = camera.on("projMatrix", updateDotPos);
const onCanvasBnd = scene.canvas.on("boundary", updateDotPos);
const planesUpdate = scene.on("sectionPlaneUpdated", updateDotPos);
const planeCreated = scene.on("sectionPlaneCreated", updateDotPos);
const planeDestroyed = scene.on("sectionPlaneDestroyed", updateDotPos);
this._updatePosition = updateDotPos;
this._cleanup = () => {
camera.off(onViewMatrix);
camera.off(onProjMatrix);
scene.canvas.off(onCanvasBnd);
scene.off(planesUpdate);
scene.off(planeCreated);
scene.off(planeDestroyed);
this._dot.destroy();
};
}
setClickable(value) {
this._dot.setClickable(value);
}
setFillColor(value) {
this._dot.setFillColor(value);
}
setBorderColor(value) {
this._dot.setBorderColor(value);
}
setHighlighted(value) {
this._dot.setHighlighted(value);
}
setOpacity(value) {
this._dot.setOpacity(value);
}
setVisible(value) {
if (this.__visible != value) {
this.__visible = value;
this._updatePosition();
this._dot.setVisible(value);
}
}
destroy() {
this._cleanup();
super.destroy();
}
}
export class Label3D {
constructor(scene, parentElement, cfg) {
const camera = scene.camera;
this._label = new Label(parentElement, cfg);
this._start = math.vec3();
this._mid = math.vec3();
this._end = math.vec3();
this._yOff = 0;
this.__visible = true;
this._updatePos = () => {
toClipSpace(camera, this._start, tmpVec4a);
math.mulVec4Scalar(tmpVec4a, 1.0 / tmpVec4a[3]);
toCanvasSpace(scene.canvas.canvas, parentElement, tmpVec4a, tmpVec2a);
this._label.setPos(tmpVec2a[0], tmpVec2a[1]);
};
const setPosOnWire = (p0, p1, yOff) => {
p0[0] += p1[0];
p0[1] += p1[1];
math.mulVec2Scalar(p0, .5);
this._label.setPos(p0[0], p0[1] + yOff);
};
this._updatePosBetween = () => {
const visibleA = clipSegment(scene, parentElement, this._start, this._mid, tmpVec2a, tmpVec2b);
const visibleB = clipSegment(scene, parentElement, this._end, this._mid, tmpVec2c, tmpVec2d);
this._label.setCulled(! (visibleA || visibleB));
if (visibleA && visibleB) {
tmpVec2b[0] += tmpVec2d[0];
tmpVec2b[1] += tmpVec2d[1];
math.mulVec2Scalar(tmpVec2b, .5);
tmpVec2b[0] += tmpVec2a[0] + tmpVec2c[0];
tmpVec2b[1] += tmpVec2a[1] + tmpVec2c[1];
math.mulVec2Scalar(tmpVec2b, 1/3);
this._label.setPos(tmpVec2b[0], tmpVec2b[1]);
} else if (visibleA) {
setPosOnWire(tmpVec2a, tmpVec2b, 0);
} else if (visibleB) {
setPosOnWire(tmpVec2c, tmpVec2d, 0);
}
};
this._updatePosOnWire = () => {
const visible = (clipSegment(scene, parentElement, this._start, this._end, tmpVec2a, tmpVec2b)
&&
(math.distVec2(tmpVec2a, tmpVec2b) >= this._labelMinAxisLength));
this._label.setCulled(!visible);
if (visible) {
setPosOnWire(tmpVec2a, tmpVec2b, this._yOff);
}
};
let posUpdate = () => { };
this._setUpdatePositions = (_posUpdate) => {
posUpdate = _posUpdate;
this._updatePositions();
};
this._updatePositions = () => {
if (this.__visible) {
posUpdate();
}
};
const onViewMatrix = camera.on("viewMatrix", this._updatePositions);
const onProjMatrix = camera.on("projMatrix", this._updatePositions);
const onCanvasBnd = scene.canvas.on("boundary", this._updatePositions);
const planesUpdate = scene.on("sectionPlaneUpdated", this._updatePositions);
const planeCreated = scene.on("sectionPlaneCreated", this._updatePositions);
const planeDestroyed = scene.on("sectionPlaneDestroyed", this._updatePositions);
this._cleanup = () => {
camera.off(onViewMatrix);
camera.off(onProjMatrix);
scene.canvas.off(onCanvasBnd);
scene.off(planesUpdate);
scene.off(planeCreated);
scene.off(planeDestroyed);
this._label.destroy();
};
}
setPos(p0) {
this._start.set(p0);
this._setUpdatePositions(this._updatePos);
}
setPosOnWire(p0, p1, yOff, labelMinAxisLength) {
this._start.set(p0);
this._end.set(p1);
this._yOff = yOff;
this._labelMinAxisLength = labelMinAxisLength;
this._setUpdatePositions(this._updatePosOnWire);
}
setPosBetween(p0, p1, p2) {
this._start.set(p0);
this._mid.set(p1);
this._end.set(p2);
this._setUpdatePositions(this._updatePosBetween);
}
setFillColor(value) {
this._label.setFillColor(value);
}
setHighlighted(value) {
this._label.setHighlighted(value);
}
setText(value) {
this._label.setText(value);
}
setClickable(value) {
this._label.setClickable(value);
}
setVisible(value) {
if (this.__visible != value) {
this.__visible = value;
this._updatePositions();
this._label.setVisible(value);
}
}
destroy() {
this._cleanup();
}
}
export class Wire3D {
constructor(scene, parentElement, cfg) {
const camera = scene.camera;
this._wire = new Wire(parentElement, cfg);
this._start = math.vec3();
this._end = math.vec3();
this.__visible = true;
this._updatePositions = () => {
if (! this.__visible) {
return;
}
const visible = clipSegment(scene, parentElement, this._start, this._end, tmpVec2a, tmpVec2b);
this._wire.setCulled(! visible);
if (visible) {
this._wire.setStartAndEnd(tmpVec2a[0], tmpVec2a[1], tmpVec2b[0], tmpVec2b[1]);
}
};
const onViewMatrix = camera.on("viewMatrix", this._updatePositions);
const onProjMatrix = camera.on("projMatrix", this._updatePositions);
const onCanvasBnd = scene.canvas.on("boundary", this._updatePositions);
const planesUpdate = scene.on("sectionPlaneUpdated", this._updatePositions);
const planeCreated = scene.on("sectionPlaneCreated", this._updatePositions);
const planeDestroyed = scene.on("sectionPlaneDestroyed", this._updatePositions);
this._cleanup = () => {
camera.off(onViewMatrix);
camera.off(onProjMatrix);
scene.canvas.off(onCanvasBnd);
scene.off(planesUpdate);
scene.off(planeCreated);
scene.off(planeDestroyed);
this._wire.destroy();
};
}
setEnds(start, end) {
this._start.set(start);
this._end.set(end);
this._updatePositions();
}
setClickable(value) {
this._wire.setClickable(value);
}
setColor(value) {
this._wire.setColor(value);
}
setHighlighted(value) {
this._wire.setHighlighted(value);
}
setOpacity(value) {
this._wire.setOpacity(value);
}
setVisible(value) {
if (this.__visible != value) {
this.__visible = value;
this._updatePositions();
this._wire.setVisible(value);
}
}
destroy() {
this._cleanup();
}
}
export const marker3D = function(scene, color) {
const marker = new Dot3D(scene, {}, scene.canvas.canvas.parentNode, {
borderColor: "white",
fillColor: color,
zIndex: 100
});
return {
update: function(worldPos) {
if (worldPos)
{
marker.worldPos = worldPos;
}
marker.setVisible(!!worldPos);
},
setFillColor: c => marker.setFillColor(c),
setHighlighted: h => marker.setHighlighted(h),
getCanvasPos: () => marker.canvasPos,
getWorldPos: () => marker.worldPos,
destroy: () => marker.destroy()
};
};
export const wire3D = function(scene, color) {
const wire = new Wire3D(scene, scene.canvas.canvas.ownerDocument.body, {
color: color,
thickness: 1,
thicknessClickable: 6 // TODO: Remove to make not clickable?
});
wire.setVisible(false);
return {
update: (startWorldPos, endWorldPos) => {
if (endWorldPos)
{
wire.setEnds(startWorldPos, endWorldPos);
}
wire.setVisible(!!endWorldPos);
},
setColor: c => wire.setColor(c),
destroy: () => wire.destroy()
};
};
export function activateDraggableDot(dot, cfg) {
const extractCFG = function(propName, defaultValue) {
if (propName in cfg) {
return cfg[propName];
} else if (defaultValue !== undefined) {
return defaultValue;
} else {
throw "config missing: " + propName;
}
};
const viewer = extractCFG("viewer");
const ray2WorldPos = extractCFG("ray2WorldPos");
const handleMouseEvents = extractCFG("handleMouseEvents", false);
const handleTouchEvents = extractCFG("handleTouchEvents", false);
const onStart = extractCFG("onStart", nop);
const onMove = extractCFG("onMove", nop);
const onEnd = extractCFG("onEnd", nop);
const scene = viewer.scene;
const canvas = scene.canvas.canvas;
const pickWorldPos = canvasPos => {
const origin = math.vec3();
const direction = math.vec3();
math.canvasPosToWorldRay(canvas, scene.camera.viewMatrix, scene.camera.projMatrix, scene.camera.projection, canvasPos, origin, direction);
return ray2WorldPos(origin, direction, canvasPos);
};
const onChange = event => {
const canvasPos = math.vec2([ event.clientX, event.clientY ]);
transformToNode(canvas.ownerDocument.documentElement, canvas, canvasPos);
onMove(canvasPos, pickWorldPos(canvasPos));
};
let currentDrag = null;
const onDragMove = function(event) {
const e = currentDrag.matchesEvent(event);
if (e)
{
onChange(e);
}
};
const onDragEnd = function(event) {
const e = currentDrag.matchesEvent(event);
if (e)
{
dot.setOpacity(idleOpacity);
currentDrag.cleanup();
onChange(e);
onEnd();
}
};
const startDrag = function(matchesEvent, cleanupHandlers) {
if (currentDrag) {
currentDrag.cleanup();
}
dot.setOpacity(1.0);
dot.setClickable(false);
viewer.cameraControl.active = false;
currentDrag = {
matchesEvent: matchesEvent,
cleanup: function() {
currentDrag = null;
dot.setClickable(true);
viewer.cameraControl.active = true;
cleanupHandlers();
}
};
onStart();
};
const cleanupDotHandlers = [ ];
const dot_on = function(event, callback) {
const id = dot.on(event, callback);
cleanupDotHandlers.push(() => dot.off(id));
};
if (handleMouseEvents)
{
dot_on("mouseover", () => (! currentDrag) && dot.setOpacity(1.0));
dot_on("mouseleave", () => (! currentDrag) && dot.setOpacity(idleOpacity));
dot_on("mousedown", event => {
if (event.which === 1)
{
canvas.addEventListener("mousemove", onDragMove);
canvas.addEventListener("mouseup", onDragEnd);
startDrag(
event => (event.which === 1) && event,
() => {
canvas.removeEventListener("mousemove", onDragMove);
canvas.removeEventListener("mouseup", onDragEnd);
});
}
});
}
if (handleTouchEvents)
{
let touchStartId;
dot_on("touchstart", event => {
event.preventDefault();
if (event.touches.length === 1)
{
touchStartId = event.touches[0].identifier;
startDrag(
event => [...event.changedTouches].find(e => e.identifier === touchStartId),
() => { touchStartId = null; });
}
});
dot_on("touchmove", event => {
event.preventDefault();
onDragMove(event);
});
dot_on("touchend", event => {
event.preventDefault();
onDragEnd(event);
});
}
const idleOpacity = 0.8;
dot.setOpacity(idleOpacity);
return function() {
currentDrag && currentDrag.cleanup();
cleanupDotHandlers.forEach(c => c());
dot.setOpacity(1.0);
};
};
export function activateDraggableDots(cfg) {
const extractCFG = function(propName, defaultValue) {
if (propName in cfg) {
return cfg[propName];
} else if (defaultValue !== undefined) {
return defaultValue;
} else {
throw "config missing: " + propName;
}
};
const viewer = extractCFG("viewer");
const handleMouseEvents = extractCFG("handleMouseEvents", false);
const handleTouchEvents = extractCFG("handleTouchEvents", false);
const pointerLens = extractCFG("pointerLens", null);
const dots = extractCFG("dots");
const ray2WorldPos = extractCFG("ray2WorldPos");
const onEnd = extractCFG("onEnd", nop);
const updatePointerLens = (pointerLens
? function(canvasPos) {
pointerLens.visible = !! canvasPos;
if (canvasPos)
{
pointerLens.canvasPos = canvasPos;
}
}
: () => { });
const cleanups = dots.map(dot => {
let initPos;
return activateDraggableDot(dot, {
handleMouseEvents: handleMouseEvents,
handleTouchEvents: handleTouchEvents,
viewer: viewer,
ray2WorldPos: (orig, dir, canvasPos) => (ray2WorldPos(orig, dir, canvasPos) || initPos),
onStart: () => {
initPos = dot.worldPos.slice();
setOtherDotsActive(false, dot);
},
onMove: (canvasPos, worldPos) => {
updatePointerLens(canvasPos);
dot.worldPos = worldPos;
},
onEnd: () => {
if (! onEnd(initPos, dot)) {
dot.worldPos = initPos;
}
updatePointerLens(null);
setOtherDotsActive(true, dot);
}
});
});
const setOtherDotsActive = (active, dot) => dots.forEach(d => (d !== dot) && d.setClickable(active));
setOtherDotsActive(true);
return function() {
cleanups.forEach(c => c());
updatePointerLens(null);
};
}
export const touchPointSelector = function(viewer, pointerCircle, ray2WorldPos) {
return function(onCancel, onChange, onCommit) {
const scene = viewer.scene;
const canvas = scene.canvas.canvas;
const longTouchTimeoutMs = 300;
const moveTolerance = 20;
const copyCanvasPos = (event, vec2) => {
vec2[0] = event.clientX;
vec2[1] = event.clientY;
transformToNode(canvas.ownerDocument.documentElement, canvas, vec2);
return vec2;
};
const pickWorldPos = canvasPos => {
const origin = math.vec3();
const direction = math.vec3();
math.canvasPosToWorldRay(canvas, scene.camera.viewMatrix, scene.camera.projMatrix, scene.camera.projection, canvasPos, origin, direction);
return ray2WorldPos(origin, direction);
};
let longTouchTimeout = null;
const nop = () => { };
let onSingleTouchMove = nop;
let startTouchIdentifier;
const resetAction = function() {
pointerCircle.stop();
clearTimeout(longTouchTimeout);
viewer.cameraControl.active = true;
onSingleTouchMove = nop;
startTouchIdentifier = null;
};
const cleanup = function() {
resetAction();
canvas.removeEventListener("touchstart", onCanvasTouchStart);
canvas.removeEventListener("touchmove", onCanvasTouchMove);
canvas.removeEventListener("touchend", onCanvasTouchEnd);
};
const onCanvasTouchStart = function(event) {
const touches = event.touches;
if (touches.length !== 1)
{
resetAction();
onCancel();
}
else
{
const startTouch = touches[0];
const startCanvasPos = copyCanvasPos(startTouch, math.vec2());
const startWorldPos = pickWorldPos(startCanvasPos);
if (startWorldPos)
{
startTouchIdentifier = startTouch.identifier;
onSingleTouchMove = canvasPos => {
if (math.distVec2(startCanvasPos, canvasPos) > moveTolerance)
{
resetAction();
}
};
longTouchTimeout = setTimeout(
function() {
pointerCircle.start(startCanvasPos);
longTouchTimeout = setTimeout(
function() {
pointerCircle.stop();
viewer.cameraControl.active = false;
onSingleTouchMove = canvasPos => {
onChange(canvasPos, pickWorldPos(canvasPos));
};
onSingleTouchMove(startCanvasPos);
},
longTouchTimeoutMs);
},
250);
}
}
};
canvas.addEventListener("touchstart", onCanvasTouchStart, {passive: true});
// canvas.addEventListener("touchcancel", e => console.log("touchcancel", e), {passive: true});
const onCanvasTouchMove = function(event) {
const touch = [...event.changedTouches].find(e => e.identifier === startTouchIdentifier);
if (touch)
{
onSingleTouchMove(copyCanvasPos(touch, math.vec2()));
}
};
canvas.addEventListener("touchmove", onCanvasTouchMove, {passive: true});
const onCanvasTouchEnd = function(event) {
const touch = [...event.changedTouches].find(e => e.identifier === startTouchIdentifier);
if (touch)
{
cleanup();
const canvasPos = copyCanvasPos(touch, math.vec2());
onCommit(canvasPos, pickWorldPos(canvasPos));
}
};
canvas.addEventListener("touchend", onCanvasTouchEnd, {passive: true});
return cleanup;
};
};
export const triangulateEarClipping = function(planeCoords) {
const polygonVertices = [ ];
for (let i = 0; i < planeCoords.length; ++i)
polygonVertices.push(i);
const isCCW = (function() {
const ba = math.vec2();
const bc = math.vec2();
let anglesSum = 0;
const angles = [ ];
for (let i = 0; i < polygonVertices.length; ++i)
{
const a = planeCoords[polygonVertices[i]];
const b = planeCoords[polygonVertices[(i + 1) % polygonVertices.length]];
const c = planeCoords[polygonVertices[(i + 2) % polygonVertices.length]];
math.subVec2(a, b, ba);
math.subVec2(c, b, bc);
const theta = math.dotVec2(ba, bc) / Math.sqrt(math.sqLenVec2(ba) * math.sqLenVec2(bc));
const angle = Math.acos(Math.max(-1, Math.min(theta, 1)));
const convex = (ba[0] * bc[1] - ba[1] * bc[0]) >= 0;
anglesSum += convex ? angle : (2 * Math.PI - angle);
}
return anglesSum < (polygonVertices.length * Math.PI);
})();
const pointInTriangle = (function() {
const sign = (p1, p2, p3) => {
return (p1[0] - p3[0]) * (p2[1] - p3[1]) - (p2[0] - p3[0]) * (p1[1] - p3[1]);
};
return (pt, v1, v2, v3) => {
const d1 = sign(pt, v1, v2);
const d2 = sign(pt, v2, v3);
const d3 = sign(pt, v3, v1);
const has_neg = (d1 < 0) || (d2 < 0) || (d3 < 0);
const has_pos = (d1 > 0) || (d2 > 0) || (d3 > 0);
return !(has_neg && has_pos);
};
})();
const baseTriangles = [ ];
const vertices = (isCCW ? polygonVertices : polygonVertices.slice(0).reverse()).map(i => ({ idx: i }));
vertices.forEach((v, i) => {
v.prev = vertices[(i - 1 + vertices.length) % vertices.length];
v.next = vertices[(i + 1) % vertices.length];
});
const ba = math.vec2();
const bc = math.vec2();
while (vertices.length > 2) {
let earIdx = 0;
while (true) {
if (earIdx >= vertices.length)
{
throw `isCCW = ${isCCW}; earIdx = ${earIdx}; len = ${vertices.length}`;
}
const v = vertices[earIdx];
const a = planeCoords[v.prev.idx];
const b = planeCoords[v.idx];
const c = planeCoords[v.next.idx];
math.subVec2(a, b, ba);
math.subVec2(c, b, bc);
if (((ba[0] * bc[1] - ba[1] * bc[0]) >= 0) // a convex vertex
&&
vertices.every( // no other vertices inside
vv => ((vv === v)
||
(vv === v.prev)
||
(vv === v.next)
||
!pointInTriangle(planeCoords[vv.idx], a, b, c))))
break;
++earIdx;
}
const ear = vertices[earIdx];
vertices.splice(earIdx, 1);
baseTriangles.push([ ear.idx, ear.next.idx, ear.prev.idx ]);
const prev = ear.prev;
prev.next = ear.next;
const next = ear.next;
next.prev = ear.prev;
}
return [ planeCoords, baseTriangles, isCCW ];
};
export const addMousePressListener = function(element, onChange) {
const moveTolerance = 4;
const copyElementPos = (event, out) => {
out[0] = event.clientX;
out[1] = event.clientY;
transformToNode(element.ownerDocument.documentElement, element, out);
return out;
};
let buttonDown = false;
const cleanups = [ ];
const cleanup = () => cleanups.forEach(c => c());
const addElementEventListener = (type, listener) => {
element.addEventListener(type, listener);
cleanups.push(() => element.removeEventListener(type, listener));
};
const downPos = math.vec2();
addElementEventListener("mousedown", function(event) {
if (event.which === 1) {
buttonDown = true;
onChange(copyElementPos(event, downPos));
}
});
addElementEventListener("mousemove", function(event) {
copyElementPos(event, tmpVec2a);
if (buttonDown && (math.distVec2(downPos, tmpVec2a) > moveTolerance)) {
buttonDown = false;
}
if (buttonDown || (! event.buttons & 1)) {
onChange(tmpVec2a);
}
});
addElementEventListener("mouseup", function(event) {
if ((event.which === 1) && buttonDown) {
const commit = onChange(copyElementPos(event, tmpVec2a));
if (commit) {
cleanup();
commit();
}
}
});
return cleanup;
};
export const addTouchPressListener = function(element, cameraControl, pointerCircle, onChange) {
const longTouchTimeoutMs = 300;
const moveTolerance = 20;
const startPos = math.vec2();
const copyElementPos = (event, out) => {
out[0] = event.clientX;
out[1] = event.clientY;
transformToNode(element.ownerDocument.documentElement, element, out);
return out;
};
let longTouchTimeout = null;
let onSingleTouchMove = nop;
let startTouchIdentifier;
const resetAction = function() {
clearTimeout(longTouchTimeout);
pointerCircle.stop();
cameraControl.active = true;
onSingleTouchMove = nop;
startTouchIdentifier = null;
};
const cleanups = [ ];
const cleanup = () => cleanups.forEach(c => c());
const addElementEventListener = (type, listener) => {
element.addEventListener(type, listener, {passive: true});
cleanups.push(() => element.removeEventListener(type, listener));
};
addElementEventListener("touchstart", function(event) {
const touches = event.touches;
if (touches.length !== 1)
{
resetAction();
onChange(null);
}
else
{
const touch = touches[0];
copyElementPos(touch, startPos);
startTouchIdentifier = touch.identifier;
onSingleTouchMove = elementPos => {
if (math.distVec2(startPos, elementPos) > moveTolerance)
{
resetAction();
}
};
longTouchTimeout = setTimeout(
function() {
pointerCircle.start(startPos);
longTouchTimeout = setTimeout(
function() {
pointerCircle.stop();
cameraControl.active = false;
onSingleTouchMove = onChange;
onSingleTouchMove(startPos);
},
longTouchTimeoutMs);
},
250);
}
});
// element.addEventListener("touchcancel", e => console.log("touchcancel", e), {passive: true});
addElementEventListener("touchmove", function(event) {
const touch = [...event.changedTouches].find(e => e.identifier === startTouchIdentifier);
if (touch)
{
onSingleTouchMove(copyElementPos(touch, tmpVec2a));
}
});
addElementEventListener("touchend", function(event) {
const touch = [...event.changedTouches].find(e => e.identifier === startTouchIdentifier);
if (touch)
{
const commit = onChange(copyElementPos(touch, tmpVec2a));
resetAction();
if (commit) {
cleanup();
commit();
} else {
onChange(null);
}
}
});
return () => {
resetAction();
cleanup();
};
};
export const startPolygonCreate = function(scene, pointerLens, addPressListener, pickRayResult, onChange, onConclude) {
const canvas = scene.canvas.canvas;
const updatePointerLens = (pointerLens
? function(canvasPos, isSnapped) {
pointerLens.visible = !! canvasPos;
if (canvasPos)
{
pointerLens.canvasPos = canvasPos;
pointerLens.snapped = !! isSnapped;
}
}
: () => { });
const testLastSegmentIntersects = (function() {
const onSegment = (p, q, r) => ((q[0] <= Math.max(p[0], r[0])) &&
(q[0] >= Math.min(p[0], r[0])) &&
(q[1] <= Math.max(p[1], r[1])) &&
(q[1] >= Math.min(p[1], r[1])));
const orient = (p, q, r) => {
const val = (q[1] - p[1]) * (r[0] - q[0]) - (q[0] - p[0]) * (r[1] - q[1]);
// collinear
// clockwise
// counterclockwise
return ((val === 0) ? 0 : ((val > 0) ? 1 : 2));
};
return function(pos2D, lastSegmentClosesLoop) {
const s = lastSegmentClosesLoop ? 1 : 0;
const a = pos2D[(pos2D.length - 2 + s) % pos2D.length];
const b = pos2D[(pos2D.length - 1 + s) % pos2D.length];
for (let i = s; i < pos2D.length - 2 - 1 + s; ++i) {
const c = pos2D[i];
const d = pos2D[i + 1];
const o1 = orient(a, b, c);
const o2 = orient(a, b, d);
const o3 = orient(c, d, a);
const o4 = orient(c, d, b);
if (((o1 !== o2) && (o3 !== o4)) || // General case
((o1 === 0) && onSegment(a, c, b)) || // a, b and c are collinear and c lies on segment ab
((o2 === 0) && onSegment(a, d, b)) || // a, b and d are collinear and d lies on segment ab
((o3 === 0) && onSegment(c, a, d)) || // c, d and a are collinear and a lies on segment cd
((o4 === 0) && onSegment(c, b, d))) // c, d and b are collinear and b lies on segment cd
{
return true;
}
}
return false;
};
})();
const getPlane = (points) => (points.length >= 3) && (function() {
const u = math.normalizeVec3(math.subVec3(points[1], points[0], math.vec3()));
const v20 = math.normalizeVec3(math.subVec3(points[2], points[0], tmpVec3a));
const normal = math.normalizeVec3(math.cross3Vec3(u, v20, math.vec3()));
const v = math.normalizeVec3(math.cross3Vec3(normal, u, math.vec3()));
return {
normal: normal,
origin: math.vec3(points[0]),
u: u,
v: v
};
})();
const vertices = [ ];
let currentInteraction;
(function selectNextPoint() {
const plane = getPlane(vertices);
const canvasPos2Ray = (canvasPos, dst) => (math.canvasPosToWorldRay(canvas, scene.camera.viewMatrix, scene.camera.projMatrix, scene.camera.projection, canvasPos, dst.origin, dst.direction), dst);
const pickRay = (ray) => {
const pickResult = pickRayResult(ray);
const snapWorldPos = pickResult && pickResult.entity && ((! plane) || pickResult.snapped) && pickResult.worldPos;
if (plane) {
const originDistance = math.dotVec3(plane.normal, plane.origin);
const snapPlaneDist = (snapWorldPos
? ((originDistance - math.dotVec3(snapWorldPos, plane.normal)))
: window.Infinity);
if (Math.abs(snapPlaneDist) < 0.0001) {
const ret = math.vec3();
return {
worldPos: math.addVec3(snapWorldPos, math.mulVec3Scalar(plane.normal, snapPlaneDist, ret), ret),
snapped: true
};
} else {
return {
worldPos: planeIntersect(originDistance, plane.normal, ray.origin, ray.direction),
snapped: false
};
}
} else {
return {
worldPos: snapWorldPos,
snapped: pickResult && pickResult.snapped
};
}
};
let placeVertex = false;
const removePressListener = addPressListener(
(inputCanvasPos) => {
const rayPick = inputCanvasPos && pickRay(canvasPos2Ray(inputCanvasPos, tmpRay));
const worldPos = rayPick && rayPick.worldPos;
return onWorldPos(worldPos, inputCanvasPos, rayPick && rayPick.snapped);
});
const onWorldPos = (worldPos, inputCanvasPos, rayPickSnapped) => {
const canvasPos = worldPos ? scene.camera.projectWorldPos(worldPos) : inputCanvasPos;
const firstMarker = (vertices.length > 0) && (function() {
const v = vertices[0];
return {
canvasPos: scene.camera.projectWorldPos(v),
worldPos: v
};
})();
const snapToFirst = (vertices.length >= 3) && ((canvasPos && (math.distVec2(canvasPos, firstMarker.canvasPos) < 10))
||
(worldPos && math.compareVec3(worldPos, firstMarker.worldPos)));
updatePointerLens(snapToFirst ? firstMarker.canvasPos : canvasPos, snapToFirst || rayPickSnapped);
const lastPointOverlaps = (inputCanvasPos
&&
((! worldPos)
||
((vertices.length < 3)
? vertices.some(v => math.compareVec3(v, worldPos))
: math.compareVec3(vertices[vertices.length - 1], worldPos))));
const points = vertices.concat(((! snapToFirst) && worldPos && (! lastPointOverlaps)) ? [worldPos] : []);
const curPlane = (! lastPointOverlaps) && (plane || getPlane(points));
const uvs = curPlane && points.map(p => {
math.subVec3(p, curPlane.origin, tmpVec3a);
return math.vec2([ math.dotVec3(tmpVec3a, curPlane.u), math.dotVec3(tmpVec3a, curPlane.v) ]);
});
const isValid = (! lastPointOverlaps) && (! (uvs && testLastSegmentIntersects(uvs, snapToFirst)));
const geometry = isValid && uvs && (snapToFirst || (! testLastSegmentIntersects(uvs, true))) && (function() {
try {
const [ baseVertices, baseTriangles, isCCW ] = triangulateEarClipping(uvs);
return {
faces: baseTriangles,
vertices: baseVertices.map(uv => math.addVec3(
curPlane.origin,
math.addVec3(
math.mulVec3Scalar(curPlane.u, uv[0], tmpVec3a),
math.mulVec3Scalar(curPlane.v, uv[1], tmpVec3b),
tmpVec3a),
math.vec3()))
};
} catch (e) {
console.warn("e", e);
return false;
}
})();
onChange(points, snapToFirst, isValid, geometry);
return placeVertex = (isValid && (snapToFirst
? () => {
updatePointerLens(null);
onConclude();
}
: () => {
vertices.push(math.vec3(worldPos));
updatePointerLens(null);
selectNextPoint();
}));
};
currentInteraction = {
closePolygon: (() => {
const commit = (vertices.length >= 3) && onWorldPos(vertices[0]);
if (commit) {
removePressListener();
commit();
}
return !! commit;
}),
placeVertex: () => {
if (placeVertex) {
removePressListener();
placeVertex();
}
return !!placeVertex;
},
popVertex: () => {
if (vertices.length > 0) {
removePressListener();
vertices.pop();
selectNextPoint();
return true;
} else {
return false;
}
},
removePressListener: removePressListener,
updateOnChange: () => onWorldPos()
};
})();
return {
cancel: () => {
currentInteraction.removePressListener();
updatePointerLens(null);
},
closePolygon: () => currentInteraction.closePolygon(),
placeVertex: () => currentInteraction.placeVertex(),
popVertex: () => currentInteraction.popVertex(),
updateOnChange: () => currentInteraction.updateOnChange()
};
};