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add two-touch layer y-slider on touch devices

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This commit is contained in:
Stewart Allen 2020-04-01 20:07:35 -04:00
commit 57bbced374
1 changed files with 22 additions and 3 deletions
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25
js/moto-ctrl.js
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@ -98,6 +98,10 @@ MOTO.CTRL = function (object, domElement, notify, slider) {
// so camera.up is the orbit axis
quat = new THREE.Quaternion().setFromUnitVectors(object.up, new THREE.Vector3(0, 1, 0)),
quatInverse = quat.clone().inverse(),
// touch tracking
firstTouch = [],
touchSlide = false,
lastDY = 0,
// events
changeEvent = { type: 'change'},
startEvent = { type: 'start'},
@ -478,6 +482,11 @@ MOTO.CTRL = function (object, domElement, notify, slider) {
let dx = event.touches[ 0 ].pageX - event.touches[ 1 ].pageX;
let dy = event.touches[ 0 ].pageY - event.touches[ 1 ].pageY;
let distance = Math.sqrt(dx * dx + dy * dy);
firstTouch = [...event.touches].map(v => { return {x:v.pageX, y:v.pageY} });
touchSlide = false;
lastDY = 0;
dollyStart.set(0, distance);
break;
@ -527,15 +536,25 @@ MOTO.CTRL = function (object, domElement, notify, slider) {
let dy = event.touches[ 0 ].pageY - event.touches[ 1 ].pageY;
let distance = Math.sqrt(dx * dx + dy * dy);
let touches = [...event.touches].map(v => { return {x:v.pageX, y:v.pageY} });
let ddx = ( (touches[0].x - firstTouch[0].x) + (touches[1].x - firstTouch[1].x) ) / 2;
let ddy = ( (touches[0].y - firstTouch[0].y) + (touches[1].y - firstTouch[1].y) ) / 2;
if (scope.reverseZoom) distance = -distance;
dollyEnd.set(0, distance);
dollyDelta.subVectors(dollyEnd, dollyStart);
if (dollyDelta.y > 0) {
scope.dollyOut();
if (touchSlide || (Math.abs(ddy/ddx) > 10 && slider)) {
touchSlide = true;
slider(lastDY ? lastDY - ddy : ddy);
lastDY = ddy;
} else {
scope.dollyIn();
if (dollyDelta.y > 0) {
scope.dollyOut();
} else {
scope.dollyIn();
}
}
dollyStart.copy(dollyEnd);