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EmbraceLife/.block

Last active August 2, 2016 01:09
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14.click-scatter-transition
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.block
license: gpl-3.0
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README.md
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index.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>D3: Transitioning points to randomized values</title>
<script src="https://d3js.org/d3.v4.min.js"></script>
<style type="text/css">
.axis path,
.axis line {
fill: none;
stroke: black;
shape-rendering: crispEdges;
}
.axis text {
font-family: sans-serif;
font-size: 11px;
}
</style>
</head>
<body>
<p>Click on this text to update the chart with new data values as many times as you like!</p>
<script type="text/javascript">
var margin = {top: 20, right: 10, bottom: 20, left: 30};
var w = 600;
var h = 400;
var width = w - margin.left - margin.right;
var height = h - margin.top - margin.bottom;
var dataset = [];
var numDataPoints = 50;
var maxRange = Math.random() * 1000;
// ---- create array of 50 (x,y) coords -----------------------
for (var i = 0; i < numDataPoints; i++) {
var newNumber1 = Math.floor(Math.random() * maxRange);
var newNumber2 = Math.floor(Math.random() * maxRange);
dataset.push([newNumber1, newNumber2]);
}
var svg = d3.select("body")
.append("svg")
.attr("width", w)
.attr("height", h)
.append("g")
.attr("transform", "translate(" + margin.left +", " + margin.top + ")");
var xScale = d3.scaleLinear()
.domain([0, d3.max(dataset, function(d) { return d[0]; })])
.range([0, width]);
var yScale = d3.scaleLinear()
.domain([0, d3.max(dataset, function(d) { return d[1]; })])
.range([height, 0]); // standard way
var xAxis = d3.axisBottom(xScale)
.ticks(10);
var yAxis = d3.axisLeft(yScale)
.ticks(5);
svg.append("g")
.attr("class", "axis")
.attr("transform", "translate(0," + height + ")")
.call(xAxis);
svg.append("g")
.attr("class", "axis")
.call(yAxis);
svg.selectAll("circle")
.data(dataset)
.enter()
.append("circle")
.attr("cx", function(d) {
return xScale(d[0]);
})
.attr("cy", function(d) {
return yScale(d[1]);
})
.attr("r", 2);
d3.select("p")
.on("click", function() {
var numValues = dataset.length;
// get maxRange value between 0 to 1000
var maxRange = Math.random() * 1000;
dataset = [];
// create an array of equal length, element value within maxRange
for (var i = 0; i < numValues; i++) {
var newNumber1 = Math.floor(Math.random() * maxRange);
var newNumber2 = Math.floor(Math.random() * maxRange);
dataset.push([newNumber1, newNumber2]);
}
xScale.domain([0, d3.max(dataset, function(d) { return d[0]; })]);
yScale.domain([0, d3.max(dataset, function(d) { return d[1]; })]);
// ---- equal length of dataset, only update elements, no entering elements ----
svg.selectAll("circle")
.data(dataset)
.transition()
.duration(1000)
.attr("cx", function(d) {
return xScale(d[0]);
})
.attr("cy", function(d) {
return yScale(d[1]);
});
});
</script>
</body>
</html>
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