@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 {math} from "../../../math/math.js";
const getCanvasPosFromEvent = function (event, canvasPos) {
if (!event) {
event = window.event;
canvasPos[0] = event.x;
canvasPos[1] = event.y;
} else {
let element = event.target;
let totalOffsetLeft = 0;
let totalOffsetTop = 0;
while (element.offsetParent) {
totalOffsetLeft += element.offsetLeft;
totalOffsetTop += element.offsetTop;
element = element.offsetParent;
}
canvasPos[0] = event.pageX - totalOffsetLeft;
canvasPos[1] = event.pageY - totalOffsetTop;
}
return canvasPos;
};
/**
* @private
*/
class TouchPanRotateAndDollyHandler {
constructor(scene, controllers, configs, states, updates) {
this._scene = scene;
const pickController = controllers.pickController;
const pivotController = controllers.pivotController;
const tapStartCanvasPos = math.vec2();
const tapCanvasPos0 = math.vec2();
const tapCanvasPos1 = math.vec2();
const touch0Vec = math.vec2();
const lastCanvasTouchPosList = [];
const canvas = this._scene.canvas.canvas;
let numTouches = 0;
let tapStartTime = -1;
let waitForTick = false;
this._onTick = scene.on("tick", () => {
waitForTick = false;
});
let firstDragDeltaX = 0;
let firstDragDeltaY = 1;
let absorbTinyFirstDrag = false;
canvas.addEventListener("touchstart", this._canvasTouchStartHandler = (event) => {
if (!(configs.active && configs.pointerEnabled)) {
return;
}
event.preventDefault();
const touches = event.touches;
const changedTouches = event.changedTouches;
states.touchStartTime = Date.now();
if (touches.length === 1 && changedTouches.length === 1) {
tapStartTime = states.touchStartTime;
getCanvasPosFromEvent(touches[0], tapStartCanvasPos);
if (configs.followPointer) {
pickController.pickCursorPos = tapStartCanvasPos;
pickController.schedulePickSurface = true;
pickController.update();
if (!configs.planView) {
if (pickController.picked && pickController.pickedSurface && pickController.pickResult && pickController.pickResult.worldPos) {
pivotController.setPivotPos(pickController.pickResult.worldPos);
if (!configs.firstPerson && pivotController.startPivot()) {
pivotController.showPivot();
}
} else {
if (configs.smartPivot) {
pivotController.setCanvasPivotPos(states.pointerCanvasPos);
} else {
pivotController.setPivotPos(scene.camera.look);
}
if (!configs.firstPerson && pivotController.startPivot()) {
pivotController.showPivot();
}
}
}
}
} else {
tapStartTime = -1;
}
while (lastCanvasTouchPosList.length < touches.length) {
lastCanvasTouchPosList.push(math.vec2());
}
for (let i = 0, len = touches.length; i < len; ++i) {
getCanvasPosFromEvent(touches[i], lastCanvasTouchPosList[i]);
}
numTouches = touches.length;
});
canvas.addEventListener("touchend", this._canvasTouchEndHandler = () => {
if (pivotController.getPivoting()) {
pivotController.endPivot();
pivotController.hidePivot();
}
firstDragDeltaX = 0;
firstDragDeltaY = 0;
absorbTinyFirstDrag = true;
})
canvas.addEventListener("touchmove", this._canvasTouchMoveHandler = (event) => {
if (!(configs.active && configs.pointerEnabled)) {
return;
}
event.stopPropagation();
event.preventDefault();
if (waitForTick) {
// Limit changes detection to one per frame
return;
}
waitForTick = true;
// Scaling drag-rotate to canvas boundary
const canvasBoundary = scene.canvas.boundary;
const canvasWidth = canvasBoundary[2];
const canvasHeight = canvasBoundary[3];
const touches = event.touches;
if (event.touches.length !== numTouches) {
// Two fingers were pressed, then one of them is removed
// We don't want to rotate in this case (weird behavior)
return;
}
if (numTouches === 1) {
getCanvasPosFromEvent(touches[0], tapCanvasPos0);
//-----------------------------------------------------------------------------------------------
// Drag rotation
//-----------------------------------------------------------------------------------------------
math.subVec2(tapCanvasPos0, lastCanvasTouchPosList[0], touch0Vec);
const xPanDelta = touch0Vec[0];
const yPanDelta = touch0Vec[1];
if (states.longTouchTimeout !== null && (Math.abs(xPanDelta) > configs.longTapRadius || Math.abs(yPanDelta) > configs.longTapRadius)) {
clearTimeout(states.longTouchTimeout);
states.longTouchTimeout = null;
}
if (configs.planView) { // No rotating in plan-view mode
const camera = scene.camera;
// We use only canvasHeight here so that aspect ratio does not distort speed
if (camera.projection === "perspective") {
const touchPicked = false;
const pickedWorldPos = [0, 0, 0];
const depth = Math.abs(touchPicked ? math.lenVec3(math.subVec3(pickedWorldPos, scene.camera.eye, [])) : scene.camera.eyeLookDist);
const targetDistance = depth * Math.tan((camera.perspective.fov / 2) * Math.PI / 180.0);
updates.panDeltaX += (xPanDelta * targetDistance / canvasHeight) * configs.touchPanRate;
updates.panDeltaY += (yPanDelta * targetDistance / canvasHeight) * configs.touchPanRate;
} else {
updates.panDeltaX += 0.5 * camera.ortho.scale * (xPanDelta / canvasHeight) * configs.touchPanRate;
updates.panDeltaY += 0.5 * camera.ortho.scale * (yPanDelta / canvasHeight) * configs.touchPanRate;
}
} else {
// if (!absorbTinyFirstDrag) {
updates.rotateDeltaY -= (xPanDelta / canvasWidth) * (configs.dragRotationRate * 1.0); // Full horizontal rotation
updates.rotateDeltaX += (yPanDelta / canvasHeight) * (configs.dragRotationRate * 1.5); // Half vertical rotation
// } else {
// firstDragDeltaY -= (xPanDelta / canvasWidth) * (configs.dragRotationRate * 1.0); // Full horizontal rotation
// firstDragDeltaX += (yPanDelta / canvasHeight) * (configs.dragRotationRate * 1.5); // Half vertical rotation
// if (Math.abs(firstDragDeltaX) > 5 || Math.abs(firstDragDeltaY) > 5) {
// updates.rotateDeltaX += firstDragDeltaX;
// updates.rotateDeltaY += firstDragDeltaY;
// firstDragDeltaX = 0;
// firstDragDeltaY = 0;
// absorbTinyFirstDrag = false;
// }
// }
}
} else if (numTouches === 2) {
const touch0 = touches[0];
const touch1 = touches[1];
getCanvasPosFromEvent(touch0, tapCanvasPos0);
getCanvasPosFromEvent(touch1, tapCanvasPos1);
const lastMiddleTouch = math.geometricMeanVec2(lastCanvasTouchPosList[0], lastCanvasTouchPosList[1]);
const currentMiddleTouch = math.geometricMeanVec2(tapCanvasPos0, tapCanvasPos1);
const touchDelta = math.vec2();
math.subVec2(lastMiddleTouch, currentMiddleTouch, touchDelta);
const xPanDelta = touchDelta[0];
const yPanDelta = touchDelta[1];
const camera = scene.camera;
// Dollying
const d1 = math.distVec2([touch0.pageX, touch0.pageY], [touch1.pageX, touch1.pageY]);
const d2 = math.distVec2(lastCanvasTouchPosList[0], lastCanvasTouchPosList[1]);
const dollyDelta = (d2 - d1) * configs.touchDollyRate;
updates.dollyDelta = dollyDelta;
if (Math.abs(dollyDelta) < 1.0) {
// We use only canvasHeight here so that aspect ratio does not distort speed
if (camera.projection === "perspective") {
const pickedWorldPos = pickController.pickResult ? pickController.pickResult.worldPos : scene.center;
const depth = Math.abs(math.lenVec3(math.subVec3(pickedWorldPos, scene.camera.eye, [])));
const targetDistance = depth * Math.tan((camera.perspective.fov / 2) * Math.PI / 180.0);
updates.panDeltaX -= (xPanDelta * targetDistance / canvasHeight) * configs.touchPanRate;
updates.panDeltaY -= (yPanDelta * targetDistance / canvasHeight) * configs.touchPanRate;
} else {
updates.panDeltaX -= 0.5 * camera.ortho.scale * (xPanDelta / canvasHeight) * configs.touchPanRate;
updates.panDeltaY -= 0.5 * camera.ortho.scale * (yPanDelta / canvasHeight) * configs.touchPanRate;
}
}
states.pointerCanvasPos = currentMiddleTouch;
}
for (let i = 0; i < numTouches; ++i) {
getCanvasPosFromEvent(touches[i], lastCanvasTouchPosList[i]);
}
});
}
reset() {
}
destroy() {
const canvas = this._scene.canvas.canvas;
canvas.removeEventListener("touchstart", this._canvasTouchStartHandler);
canvas.removeEventListener("touchend", this._canvasTouchEndHandler);
canvas.removeEventListener("touchmove", this._canvasTouchMoveHandler);
this._scene.off(this._onTick);
}
}
export {TouchPanRotateAndDollyHandler};