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December 26, 2015 11:49
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Register mouse events on screen
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| .overlay { | |
| fill-opacity: 0.1; | |
| } | |
| circle { | |
| fill: black; | |
| } | |
| </style> | |
| <body> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <script> | |
| var margin = {top: 10, bottom:10, left: 10, right: 10}, | |
| width = 300, | |
| height = 300; | |
| var svg = d3.select("body") | |
| .append("svg") | |
| .attr("width", width + margin.left + margin.right) | |
| .attr("height", height + margin.top + margin.bottom); | |
| var g = svg.append("g") | |
| .attr("transform", "translate{" + margin.left + "," + margin.top + ")"); | |
| var data = []; | |
| var x = d3.scale.linear() | |
| .range([0, width]) | |
| .domain([0, 1]); | |
| var y = d3.scale.linear() | |
| .range([height, 0]) | |
| .domain([0, 1]); | |
| var overlay = g.append("rect") | |
| .attr("class", "overlay") | |
| .attr("width", width) | |
| .attr("height", height) | |
| .on("click", function(d) { | |
| console.log("click", x.invert(d3.mouse(this)[0])); | |
| data.push({x: x.invert(d3.mouse(this)[0]), y: y.invert(d3.mouse(this)[1])}); | |
| update(); | |
| }); | |
| function update() { | |
| var pts = g.selectAll("circle") | |
| .data(data) | |
| .enter() | |
| .append("circle") | |
| .attr("cx", function(d) { return x(d.x); }) | |
| .attr("cy", function(d) { return y(d.y); }) | |
| .attr("r", 3); | |
| } | |
| </script> | |
| </body> |
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