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Small test of D3 API used to map track data from a geojson.
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title>Time & Distance mapped of tracks...</title> | |
| <meta charset="utf-8"> | |
| <style> | |
| #theMapSVG { | |
| fill : none; | |
| stroke : gray; | |
| stroke-width : .3pt; | |
| } | |
| .timecircle { | |
| fill : red; | |
| stroke : none; | |
| } | |
| .distancecircle { | |
| fill : blue; | |
| stroke : none; | |
| } | |
| .connectors { | |
| fill : none; | |
| stroke : black; | |
| stroke-width : .1pt; | |
| } | |
| text { | |
| fill : gray; | |
| stroke : none; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <H2>Time & Distance mapped of tracks...</H2> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <script> | |
| var SVGwidth = 750, SVGheight = 750; | |
| var xMargin = 10, yT = 200, yD = 100; | |
| var totaldistance = 70, totaltime = 70, distancescale=10, timescale = 10; | |
| //create SVG placeholder | |
| var svg = d3.select("body").append("svg") | |
| .attr("id", "theMapSVG") | |
| .attr("width", SVGwidth) | |
| .attr("height", SVGheight) | |
| ; | |
| //draw baseline + text for distance | |
| svg.append("line") | |
| .attr("id","distanceLine") | |
| .attr("y1", yD) | |
| .attr("y2", yD) | |
| .attr("x1", xMargin) | |
| .attr("x2", xMargin + (totaldistance * distancescale)) | |
| ; | |
| svg.append("text") | |
| .attr("x", xMargin+10) | |
| .attr("y", yT+20) | |
| .text("TIME") | |
| ; | |
| //draw baseline + text for time | |
| svg.append("line") | |
| .attr("id","timeLine") | |
| .attr("y1", yT) | |
| .attr("y2", yT) | |
| .attr("x1", xMargin) | |
| .attr("x2", xMargin + (totaltime * timescale)) | |
| ; | |
| svg.append("text") | |
| .attr("x", xMargin+10) | |
| .attr("y", yD+20) | |
| .text("DISTANCE") | |
| ; | |
| //read trackdata (asynchronously) | |
| d3.json("trackdata.geojson", function(json) { //when read, do function | |
| track=json; | |
| //create distance events | |
| svg.selectAll(".distancecircle") | |
| .data(track.features) | |
| .enter().append("circle") | |
| .attr("class", "distancecircle") | |
| .attr("cx", function(d) { | |
| return xMargin + (d.properties.dist * distancescale); }) | |
| .attr("cy", yD) | |
| .attr("r", "5") | |
| //create time events | |
| svg.selectAll(".timecircle") | |
| .data(track.features) | |
| .enter().append("circle") | |
| .attr("class", "timecircle") | |
| .attr("cx", function(d) { | |
| return xMargin + (d.properties.timestamp * timescale); }) | |
| .attr("cy", yT) | |
| .attr("r", "5") | |
| //create connectors | |
| svg.selectAll(".connectors") | |
| .data(track.features) | |
| .enter().append("line") | |
| .attr("class", "connectors") | |
| .attr("x1", function(d) { | |
| return xMargin + (d.properties.timestamp * timescale); }) | |
| .attr("y1", yT) | |
| .attr("x2", function(d) { | |
| return xMargin + (d.properties.dist * distancescale); }) | |
| .attr("y2", yD) | |
| }); | |
| //set SVG placeholder height (and thus location in HTML) | |
| d3.select(self.frameElement).style("height", SVGheight + "px"); | |
| </script> | |
| </body> | |
| </html> |
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