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lkopacz/.block

Created February 8, 2019 17:32
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D3js v4 - Drag + Zoom + Slider
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.block
license: mit
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README.md
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dots.tsv
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index.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<style>
.dot circle {
fill: lightsteelblue;
stroke: steelblue;
stroke-width: 1.5px;
}
.dot circle.dragging {
fill: red;
stroke: brown;
}
.axis line {
fill: none;
stroke: #ddd;
shape-rendering: crispEdges;
}
</style>
<title></title>
</head>
<body>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script>
var margin = { top: -5, right: -5, bottom: -5, left: -5 },
width = 460 - margin.left - margin.right,
height = 300 - margin.top - margin.bottom;
var zoom = d3.zoom()
.scaleExtent([1, 10])
.on("zoom", zoomed);
console.log(zoom.scaleExtent()[0], zoom.scaleExtent()[1]);
var drag = d3.drag()
.subject(function (d) { return d; })
.on("start", dragstarted)
.on("drag", dragged)
.on("end", dragended);
var slider = d3.select("body").append("p").append("input")
.datum({})
.attr("type", "range")
.attr("value", zoom.scaleExtent()[0])
.attr("min", zoom.scaleExtent()[0])
.attr("max", zoom.scaleExtent()[1])
.attr("step", (zoom.scaleExtent()[1] - zoom.scaleExtent()[0]) / 100)
.on("input", slided);
var svg = d3.select("body").append("svg")
.attr("width", width + margin.left + margin.right)
.attr("height", height + margin.top + margin.bottom)
.append("g")
.attr("transform", "translate(" + margin.left + "," + margin.right + ")")
.call(zoom);
var rect = svg.append("rect")
.attr("width", width)
.attr("height", height)
.style("fill", "none")
.style("pointer-events", "all");
var container = svg.append("g");
container.append("g")
.attr("class", "x axis")
.selectAll("line")
.data(d3.range(0, width, 10))
.enter().append("line")
.attr("x1", function (d) { return d; })
.attr("y1", 0)
.attr("x2", function (d) { return d; })
.attr("y2", height);
container.append("g")
.attr("class", "y axis")
.selectAll("line")
.data(d3.range(0, height, 10))
.enter().append("line")
.attr("x1", 0)
.attr("y1", function (d) { return d; })
.attr("x2", width)
.attr("y2", function (d) { return d; });
d3.tsv("dots.tsv", dottype, function (error, dots) {
dot = container.append("g")
.attr("class", "dot")
.selectAll("circle")
.data(dots)
.enter().append("circle")
.attr("r", 5)
.attr("cx", function (d) { return d.x; })
.attr("cy", function (d) { return d.y; })
.call(drag);
});
function dottype(d) {
d.x = +d.x;
d.y = +d.y;
return d;
}
function zoomed() {
const currentTransform = d3.event.transform;
container.attr("transform", currentTransform);
slider.property("value", currentTransform.k);
}
function dragstarted(d) {
d3.event.sourceEvent.stopPropagation();
d3.select(this).classed("dragging", true);
}
function dragged(d) {
d3.select(this).attr("cx", d.x = d3.event.x).attr("cy", d.y = d3.event.y);
}
function dragended(d) {
d3.select(this).classed("dragging", false);
}
function slided(d) {
zoom.scaleTo(svg, d3.select(this).property("value"));
}
</script>
</body>
</html>
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