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<!DOCTYPE html> |
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<meta charset="utf-8"> |
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<title>Indirect Animated Dragging</title> |
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<script src="http://d3js.org/d3.v3.min.js"></script> |
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<style> |
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.overlay { |
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fill: none; |
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pointer-events: all; |
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} |
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</style> |
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<body> |
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<script> |
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var width = 960 |
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,height = 500; |
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var objs = d3.range(25).map(function () { |
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return {width: Math.random()*80+20, |
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height: Math.random()*80+20, |
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x: Math.random() * width, |
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y: Math.random() * height } }); |
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var drag = d3.behavior.drag() |
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.on("drag", dragmove) |
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.on("dragend", dragend); |
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var svg = d3.select("body").append("svg") |
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.attr("width", width) |
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.attr("height", height) |
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.style('margin', '10px') |
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var g = svg.selectAll("g") |
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.data(objs) |
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.enter() |
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.append("g") |
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.classed("draggable", true) |
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.attr("transform", function(d) { return "translate(" + d.x + "," + d.y + ")"; }); |
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svg.append("rect") |
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.datum({}) |
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.attr("class", "overlay") |
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.attr("width", width) |
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.attr("height", height) |
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.call(drag); |
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g.append('rect') |
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.attr('x', function (d) { return -d.width/2 }) |
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.attr('y', function (d) { return -d.height/2 }) |
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.attr('width', function (d) { return d.width }) |
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.attr('height', function (d) { return d.height }) |
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.style({stroke: 'lightgray', fill: 'none'}); |
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g.append("text") |
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.text('x') |
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.style('text-anchor', 'middle') |
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.style('dominant-baseline', 'middle') |
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.style('font-size', function (d) { return Math.min(d.width, d.height)+'px' }) |
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.style('font-style', 'italic'); |
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function dragmove(d) { |
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if (!d.targets || d.targets.empty()) { |
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d.targets = get_element_at(d3.event.x, d3.event.y); |
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if (d.targets.empty()) return; |
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} |
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d.targets.each(function(d) { d.x += d3.event.dx; d.y += d3.event.dy}) |
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.transition() |
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.duration(250) |
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.ease('circle-out') |
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.attr('transform', function(d) {return "translate(" + d.x + "," + d.y + ")"}); |
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} |
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function dragend(d) { |
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delete d.targets; |
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} |
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function get_element_at(x,y) { |
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//d3.select('svg').append('circle').attr({cx: x, cy: y, r:3}); |
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var hits = d3.selectAll('.draggable') |
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.filter(function (d) { return x>=d.x-d.width/2 && x <= d.x+d.width/2 && y>= d.y-d.height/2 && y<=d.y+d.height/2 }); |
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return hits; |
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} |
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</script> |
