This variant of the multitouch drag example uses HTML div elements rather than SVG circles. A fancy box shadow reinforces the sense that dragged circles are temporarily elevated above the page.
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February 20, 2018 06:15
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Multitouch Drag II
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license: gpl-3.0 |
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<!DOCTYPE html> | |
<meta charset="utf-8"> | |
<meta name="viewport" content="width=device-width"> | |
<style> | |
html, | |
body { | |
height: 100%; | |
margin: 0; | |
overflow: hidden; | |
} | |
div { | |
position: absolute; | |
} | |
</style> | |
<body> | |
<script src="//d3js.org/d3.v3.min.js"></script> | |
<script> | |
var width = self.frameElement ? 960 : innerWidth, | |
height = self.frameElement ? 500 : innerHeight; | |
var data = d3.range(20).map(function() { return [Math.random() * width, Math.random() * height]; }); | |
var transform = ["", "-webkit-", "-moz-", "-ms-", "-o-"].reduce(function(p, v) { return v + "transform" in document.body.style ? v : p; }) + "transform"; | |
var color = d3.scale.category10(); | |
var radius0 = 32, | |
radius1 = 48; | |
var drag = d3.behavior.drag() | |
.origin(function(d) { return {x: d[0], y: d[1]}; }) | |
.on("dragstart", dragstarted) | |
.on("drag", dragged) | |
.on("dragend", dragended); | |
d3.select("body") | |
.on("touchstart", nozoom) | |
.on("touchmove", nozoom) | |
.selectAll("div") | |
.data(data) | |
.enter().append("div") | |
.style(transform, function(d) { return "translate(" + d[0] + "px," + d[1] + "px)"; }) | |
.style("margin-top", -radius0 + "px") | |
.style("margin-left", -radius0 + "px") | |
.style("width", radius0 * 2 + "px") | |
.style("height", radius0 * 2 + "px") | |
.style("border-radius", radius0 + "px") | |
.style("background", function(d, i) { return color(i); }) | |
.call(drag); | |
function dragstarted() { | |
this.parentNode.appendChild(this); | |
d3.select(this).transition() | |
.ease("elastic") | |
.duration(500) | |
.style("margin-top", -radius1 + "px") | |
.style("margin-left", -radius1 + "px") | |
.style("width", radius1 * 2 + "px") | |
.style("height", radius1 * 2 + "px") | |
.style("border-radius", radius1 + "px") | |
.styleTween("box-shadow", function() { return d3.interpolate("0 0px 0px rgba(0,0,0,0)", "0 4px 8px rgba(0,0,0,.3)"); }); | |
} | |
function dragged(d) { | |
d[0] = d3.event.x; | |
d[1] = d3.event.y; | |
d3.select(this) | |
.style(transform, function(d) { return "translate(" + d[0] + "px," + d[1] + "px)"; }); | |
} | |
function dragended() { | |
d3.select(this).transition() | |
.ease("elastic") | |
.duration(500) | |
.style("margin-top", -radius0 + "px") | |
.style("margin-left", -radius0 + "px") | |
.style("width", radius0 * 2 + "px") | |
.style("height", radius0 * 2 + "px") | |
.style("border-radius", radius0 + "px") | |
.styleTween("box-shadow", function() { return d3.interpolate("0 4px 8px rgba(0,0,0,.3)", "0 0px 0px rgba(0,0,0,0)"); }); | |
} | |
function nozoom() { | |
d3.event.preventDefault(); | |
} | |
</script> |
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