Multiple overlapping shapes with event-driven opacity changes and a tooltip
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December 20, 2015 14:49
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SVG shapes
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <title>shapes & tips</title> | |
| <script type="text/javascript" src="http://d3js.org/d3.v3.min.js"></script> | |
| <style> | |
| body, svg { | |
| font-family: "Helvetica Neue", Helvetica, Arial, sans-serif; | |
| position: relative; | |
| } | |
| .line, rect { | |
| stroke: black; | |
| stroke-width: 2px; | |
| } | |
| .tooltip { | |
| margin: 30px 30px 30px 30px; | |
| background-color: lightgray; | |
| border-style: solid; | |
| padding: 10px 10px 10px 10px; | |
| font-size: 1.5em; | |
| position: absolute; | |
| z-index: 100; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <script> | |
| var width= 960, height=500; | |
| // contrived pre-scaled data for use w/default accessors | |
| var data = [[ 0, 400- 0], [100, 400-133], [400, 400-178], | |
| [600, 400- 89], [800, 400-400], [960, 400-311]]; | |
| var line = d3.svg.line(); // SVG line generator using default accessors | |
| var g = d3.select("body").append("svg") | |
| .attr('width', width) | |
| .attr('height', height) | |
| .append("g"); | |
| g.append("rect") // plot a rectangle first | |
| .attr("fill", "red") | |
| .style("fill-opacity", 1) // initialize fill-opacity here, or first toggle won't work | |
| .attr("width", width) | |
| .attr("height", height) | |
| .on("mouseover", toggle) | |
| .on("mouseout", toggle); | |
| g.append("path") | |
| .datum(data) | |
| .attr("class", "line") | |
| .attr("d", line) | |
| .style("fill-opacity", 1) | |
| .on("mouseover", toggle) | |
| .on("mouseout", toggle); | |
| data.forEach(function(d) { d[0] += 90 }); | |
| g.append("path") | |
| .datum(data) | |
| .attr("class", "line") | |
| .attr("fill", "blue") | |
| .attr("d", line) | |
| .style("fill-opacity", 1) | |
| .on("mouseover", showTooltip) | |
| .on("mousemove", moveTooltip) | |
| .on("mouseout", hideTooltip); | |
| // Create the tooltip div (there's only one) | |
| var tooltip = d3.select("body") | |
| .append("div") | |
| .attr("class", "tooltip") | |
| .style("visibility", "hidden") | |
| .text("a simple tooltip"); | |
| function toggle() { | |
| if ( this.style.fillOpacity < 1 ) { | |
| this.style.fillOpacity = "1"; | |
| } else { | |
| this.style.fillOpacity = "0.5"; | |
| }; | |
| } | |
| function showTooltip(d) { | |
| this.style.fillOpacity = "0.5"; | |
| tooltip.style("visibility", "visible"); | |
| tooltip[0][0].innerHTML = "Hello,<br>world!"; | |
| tooltip.style("top", (d3.event.pageY-10)+"px") | |
| .style("left",(d3.event.pageX+20)+"px"); | |
| }; | |
| function moveTooltip(d) { | |
| tooltip.style("top", (d3.event.pageY-10)+"px") | |
| .style("left",(d3.event.pageX+20)+"px"); | |
| }; | |
| function hideTooltip(d) { | |
| this.style.fillOpacity = "1"; | |
| tooltip.style("visibility", "hidden"); | |
| }; | |
| </script> | |
| </body> | |
| </html> |
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