This is the code for Chapter 12, Figure 3 from D3.js in Action which requires a touch interface (or emulator) to see any effect. This example uses d3.touches() as a data source to create SVG circle elements at every touch location.
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Ch. 12, Fig. 3 - D3.js in Action
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| <html> | |
| <head> | |
| <title>D3 in Action Chapter 12 - Example 2</title> | |
| <meta charset="utf-8" /> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script> | |
| </head> | |
| <style> | |
| body, html { | |
| width:100%; | |
| height:100%; | |
| } | |
| #vizcontainer { | |
| width:100%; | |
| height:100%; | |
| } | |
| svg { | |
| width: 100%; | |
| height: 100%; | |
| } | |
| </style> | |
| <body> | |
| <div id="vizcontainer"> | |
| <svg></svg> | |
| </div> | |
| </body> | |
| <footer> | |
| <script> | |
| d3.select("#vizcontainer") | |
| .append("div").attr("id", "touchStatus") | |
| .append("p") | |
| .append("ol"); | |
| d3.select("svg").on("touchstart", touchStatus); | |
| d3.select("svg").on("touchmove", touchStatus); | |
| var touchColor = d3.scale.linear().domain([0,10]).range(["pink","darkred"]) | |
| function touchStatus() { | |
| d3.event.preventDefault(); | |
| d3.event.stopPropagation(); | |
| d = d3.touches(this); | |
| d3.select("svg") | |
| .selectAll("circle") | |
| .data(d) | |
| .enter() | |
| .append("circle") | |
| .attr("r", 75) | |
| .style("fill", function(d,i) {return touchColor(i)}); | |
| d3.select("svg") | |
| .selectAll("circle") | |
| .data(d) | |
| .exit() | |
| .remove(); | |
| d3.select("svg") | |
| .selectAll("circle") | |
| .attr("cx", function(d) {return d[0]}) | |
| .attr("cy", function(d) {return d[1]}); | |
| } | |
| </script> | |
| </footer> | |
| </html> |
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