Return smoothed drag end velocity with event
This commit is contained in:
Jess Telford
parent
691dc21a4d
commit
c7d1fe0c0c
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@ -32,6 +32,7 @@ Emitted with the following info:
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Emitted with the following info:
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- `offset: {x, y, z}` - The offset from entity center to drag position.
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- `velocity: {x, y, z}` - The smoothed velocity of the entity at dragend time.
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- `depth` - the perpendicular distance from the screen to align the entity while
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dragging
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- `clientX` - the final mouse event's `clientX` value
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@ -12,22 +12,33 @@
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h1 {
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font-weight: 300;
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}
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a {
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color: #FAFAFA;
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a.demo-link {
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display: block;
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padding: 15px 0;
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}
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a {
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color: #FAFAFA;
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}
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</style>
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</head>
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<body>
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<h1>A-Frame Click & Drag Component</h1>
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<a href="basic/">Basic Demo</a>
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<a class="demo-link" href="basic/">Basic Demo</a>
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<p>Click + Drag entities on the screen. Note the plane cannot be dragged (it does not have the "click-drag" attribute).</p>
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<p>Try the WASD keys to move around while dragging an entity!</p>
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<hr />
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<a href="events/">Events Demo</a>
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<a class="demo-link" href="events/">Events Demo</a>
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<p>Events are fired for beginning to drag, ending a drag, and for each drag event in etween.</p>
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<p>This example shows how those events can be used to "ghost" a dragged entity</p>
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<p>This example shows how those events can be used to "ghost" a dragged entity.</p>
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<hr />
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<a class="demo-link" href="physics/">Physics Demo</a>
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<p>Calculating the velocity at the time of drag end.</p>
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<p>Combined with a physics library (for example; <a href="https://github.com/donmccurdy/aframe-extras/tree/master/src/physics">aframe-extras physics</a>), we get some very nice interactions.</p>
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<p>Try gently tossing the ball around / throwing it at the ground.</p>
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<!-- GitHub Corner. -->
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<a href="https://github.com/jesstelford/aframe-click-drag-component" class="github-corner">
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@ -1,3 +1,7 @@
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import aframe from 'aframe';
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import extras from 'aframe-extras';
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import clickDragComponent from '../src/index';
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extras.physics.registerAll(aframe);
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clickDragComponent(aframe);
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42
examples/physics/index.html
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42
examples/physics/index.html
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@ -0,0 +1,42 @@
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<html>
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<head>
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<title>A-Frame Click & Drag Component - Events</title>
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<script src="../build.js"></script>
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</head>
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<body>
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<a-scene physics="debug: true">
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<a-sphere
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click-drag
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dynamic-body="mass: 20"
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position="0 3 -1"
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radius="1.25"
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color="#EF2D5E"
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>
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</a-sphere>
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<a-plane static-body rotation="-90 0 0" width="200" height="200" color="#7BC8A4"></a-plane>
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<a-sky color="#ECECEC"></a-sky>
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<a-entity position="0 0 3.8">
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<a-camera look-controls-enabled="false"></a-camera>
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</a-entity>
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<script>
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var draggable = document.querySelector('[click-drag]');
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draggable.addEventListener('dragstart', function(dragInfo) {
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draggable.pause();
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});
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draggable.addEventListener('dragend', function(dragInfo) {
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var x = dragInfo.detail.velocity.x;
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var y = dragInfo.detail.velocity.y;
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var z = dragInfo.detail.velocity.z;
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draggable.play();
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draggable.body.velocity.set(x, y, z);
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console.log('drag end', dragInfo.detail.velocity);
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});
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</script>
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</a-scene>
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</body>
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</html>
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12
package.json
12
package.json
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@ -5,11 +5,11 @@
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"main": "lib/index.js",
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"browser": "dist/aframe-click-drag-component.min.js",
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"scripts": {
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"build-example": "browserify examples/main.js --debug --verbose -t babelify -t [envify --NODE_ENV development ] -o examples/build.js",
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"build-example": "browserify examples/main.js --debug --verbose -g uglifyify -t [ rollupify --config rollup.config.js ] -t babelify -t [envify --NODE_ENV development ] -o examples/build.js",
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"build-lib": "mkdir -p lib && babel src/index.js -o lib/build.js",
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"dist": "browserify src/index.js --verbose --debug --standalone registerAframeClickDragComponent -g uglifyify -t rollupify -t babelify -t [envify --NODE_ENV production ] | exorcist dist/out.map > dist/out.js && uglifyjs dist/out.js --screw-ie8 -c -m --in-source-map dist/out.map --source-map dist/aframe-click-drag-component.min.js.map --source-map-url aframe-click-drag-component.min.js.map > dist/aframe-click-drag-component.min.js && rm dist/out*",
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"dist": "browserify src/index.js --verbose --debug --standalone registerAframeClickDragComponent -g uglifyify -t [ rollupify --config rollup.config.js ] -t babelify -t [envify --NODE_ENV production ] | exorcist dist/out.map > dist/out.js && uglifyjs dist/out.js --screw-ie8 -c -m --in-source-map dist/out.map --source-map dist/aframe-click-drag-component.min.js.map --source-map-url aframe-click-drag-component.min.js.map > dist/aframe-click-drag-component.min.js && rm dist/out*",
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"test": "npm run test:lint",
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"test:lint": "eslint .",
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"test:lint": "eslint ./src",
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"start": "budo examples/main.js:../build.js --serve build.js --dir examples --port 8000 --live --open -- --debug --verbose -t babelify -t [envify --NODE_ENV development ]",
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"prepublish": "in-publish && npm run dist && npm run build-lib || not-in-publish",
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"preghpages": "npm run build-example && rm -rf gh-pages && mkdir gh-pages && cp -r examples/* gh-pages",
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@ -38,6 +38,7 @@
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},
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"devDependencies": {
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"aframe": "^0.3.0",
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"aframe-extras": "^2.5.3",
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"babel-cli": "^6.14.0",
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"babel-plugin-transform-object-rest-spread": "^6.8.0",
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"babel-preset-es2015": "^6.9.0",
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@ -55,12 +56,15 @@
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"exorcist": "^0.4.0",
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"ghpages": "^0.0.8",
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"in-publish": "^2.0.0",
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"rollup-plugin-commonjs": "^5.0.4",
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"rollup-plugin-node-resolve": "^2.0.0",
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"rollupify": "^0.3.4",
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"uglify-js": "^2.7.3",
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"uglifyify": "^3.0.3"
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},
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"dependencies": {
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"deep-equal": "^1.0.1"
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"deep-equal": "^1.0.1",
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"simple-statistics": "^2.1.0"
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},
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"babel": {
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"presets": [
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12
rollup.config.js
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12
rollup.config.js
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module.exports = {
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plugins: [
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require('rollup-plugin-node-resolve')({
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jsnext: true,
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main: true,
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browser: true,
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}),
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require('rollup-plugin-commonjs')({
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include: 'node_modules/**',
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}),
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],
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};
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97
src/index.js
97
src/index.js
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@ -1,10 +1,14 @@
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import deepEqual from 'deep-equal';
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import linearRegression from 'simple-statistics/src/linear_regression';
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import linearRegressionLine from 'simple-statistics/src/linear_regression_line';
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const COMPONENT_NAME = 'click-drag';
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const DRAG_START_EVENT = 'dragstart';
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const DRAG_MOVE_EVENT = 'dragmove';
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const DRAG_END_EVENT = 'dragend';
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const TIME_TO_KEEP_LOG = 300;
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function cameraPositionToVec3(camera, vec3) {
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let element = camera;
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@ -339,6 +343,24 @@ const {initialize, tearDown} = (function closeOverInitAndTearDown() {
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let removeDragListeners;
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let draggedElement;
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let dragInfo;
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const positionLog = [];
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function cleanUpPositionLog() {
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const now = performance.now();
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while (positionLog.length && now - positionLog[0].time > TIME_TO_KEEP_LOG) {
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// remove the first element;
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positionLog.shift();
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}
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}
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function onDragged({detail: {nextPosition}}) {
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// Continuously clean up so we don't get huge logs built up
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cleanUpPositionLog();
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positionLog.push({
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position: Object.assign({}, nextPosition),
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time: performance.now(),
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});
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}
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function onMouseDown({clientX, clientY}) {
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@ -347,7 +369,17 @@ const {initialize, tearDown} = (function closeOverInitAndTearDown() {
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if (element) {
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// Can only drag one item at a time, so no need to check if any
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// listener is already set up
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removeDragListeners = dragItem(THREE, element, offset, camera, depth, {clientX, clientY});
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let removeDragItemListeners = dragItem(
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THREE,
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element,
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offset,
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camera,
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depth,
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{
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clientX,
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clientY,
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}
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);
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draggedElement = element;
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@ -359,12 +391,71 @@ const {initialize, tearDown} = (function closeOverInitAndTearDown() {
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};
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element.emit(DRAG_START_EVENT, dragInfo);
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element.addEventListener(DRAG_MOVE_EVENT, onDragged);
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removeDragListeners = _ => {
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element.removeEventListener(DRAG_MOVE_EVENT, onDragged);
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// eslint-disable-next-line no-unused-expressions
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removeDragItemListeners && removeDragItemListeners();
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// in case this removal function gets called more than once
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removeDragItemListeners = null;
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};
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}
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}
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function fitLineToVelocity(dimension) {
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if (positionLog.length < 2) {
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return 0;
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}
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const velocities = positionLog
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// Pull out just the x, y, or z values
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.map(log => ({time: log.time, value: log.position[dimension]}))
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// Then convert that into an array of array pairs [time, value]
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.reduce((memo, log, index, collection) => {
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// skip the first item (we're looking for pairs)
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if (index === 0) {
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return memo;
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}
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const deltaPosition = log.value - collection[index - 1].value;
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const deltaTime = (log.time - collection[index - 1].time) / 1000;
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// The new value is the change in position
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memo.push([log.time, deltaPosition / deltaTime]);
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return memo;
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}, []);
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// Calculate the line function
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const lineFunction = linearRegressionLine(linearRegression(velocities));
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// Calculate what the point was at the end of the line
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// ie; the velocity at the time the drag stopped
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return lineFunction(positionLog[positionLog.length - 1].time);
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}
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function onMouseUp({clientX, clientY}) {
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draggedElement.emit(DRAG_END_EVENT, Object.assign({}, dragInfo, {clientX, clientY}));
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cleanUpPositionLog();
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const velocity = {
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x: fitLineToVelocity('x'),
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y: fitLineToVelocity('y'),
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z: fitLineToVelocity('z'),
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};
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draggedElement.emit(
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DRAG_END_EVENT,
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Object.assign({}, dragInfo, {clientX, clientY, velocity})
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);
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removeDragListeners && removeDragListeners(); // eslint-disable-line no-unused-expressions
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removeDragListeners = undefined;
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}
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@ -487,4 +578,4 @@ export default function aframeDraggableComponent(aframe, componentName = COMPONE
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didMount(this, THREE, componentName);
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},
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});
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};
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}
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