JavaScript drag and drop, resizing and multi-touch gestures with inertia and snapping for modern browsers (and also IE8+).
Features include:
- inertia and snapping
- multiple interactions
- cross browser and device, supporting the desktop and mobile versions of Chrome, Firefox and Opera as well as Internet Explorer 8+
- interaction with SVG elements
- being lightweight and standalone (not yet another jQuery plugin)
- not modifying the DOM except to support IE8 and to change the cursor (but you can disable that)
- Bower:
bower install interact - npm:
npm install interact.js - Direct download the latest version: http://interactjs.io/#download
- jsDelivr CDN:
<script src="//cdn.jsdelivr.net/interact.js/VERSION/interact.min.js"></script> - cdnjs CDN:
<script src="//cdnjs.cloudflare.com/ajax/libs/interact.js/VERSION/interact.min.js"></script>(replaceVERSIONwith the SemVer you want to use)
Visit http://interactjs.io/docs for the API documentation.
var pixelSize = 16;
interact('.rainbow-pixel-canvas')
.origin('self')
.draggable({
snap: {
targets: [ interact.createSnapGrid({
x: pixelSize, y: pixelSize
}) ]
},
// allow multiple drags on the same element
maxPerElement: Infinity
})
// draw colored squares on move
.on('dragmove', function (event) {
var context = event.target.getContext('2d'),
// calculate the angle of the drag direction
dragAngle = 180 * Math.atan2(event.dx, event.dy) / Math.PI;
// set color based on drag angle and speed
context.fillStyle = 'hsl(' + dragAngle + ', 86%, '
+ (30 + Math.min(event.speed / 1000, 1) * 50) + '%)';
// draw squares
context.fillRect(event.pageX - pixelSize / 2, event.pageY - pixelSize / 2,
pixelSize, pixelSize);
})
// clear the canvas on doubletap
.on('doubletap', function (event) {
var context = event.target.getContext('2d');
context.clearRect(0, 0, context.canvas.width, context.canvas.height);
});
function resizeCanvases () {
[].forEach.call(document.querySelectorAll('.rainbow-pixel-canvas'), function (canvas) {
canvas.width = document.body.clientWidth;
canvas.height = window.innerHeight * 0.7;
});
}
// interact.js can also add DOM event listeners
interact(document).on('DOMContentLoaded', resizeCanvases);
interact(window).on('resize', resizeCanvases);See the above code in action at http://codepen.io/taye/pen/YPyLxE
interact.js is released under the MIT License.