Here lies the secret to the failure.
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April 18, 2017 22:34
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failed zoom and drag
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| </style> | |
| <svg width="800" height="500"></svg> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <script> | |
| var svg = d3.select("svg"), | |
| width = +svg.attr("width"), | |
| height = +svg.attr("height"); | |
| //create some circles at random points on the screen | |
| //create 50 circles of radius 20 | |
| //specify centre points randomly through the map function | |
| var radius = 20; | |
| var circle_data = d3.range(50).map(function() { | |
| return{ | |
| x : Math.round(Math.random() * (width - radius*2 ) + radius), | |
| y : Math.round(Math.random() * (height - radius*2 ) + radius) | |
| }; | |
| }); | |
| var rect = svg.append("g") | |
| .attr("class", "rect") | |
| .append("rect") | |
| .attr("width", width) | |
| .attr("height", height) | |
| .style("fill", "black") | |
| .style("pointer-events", "all") | |
| ; | |
| //add svg circles | |
| var circles = d3.select("svg") | |
| .append("g") | |
| .attr("class", "circles") | |
| .selectAll("circle") | |
| .data(circle_data) | |
| .enter() | |
| .append("circle") | |
| .attr("cx", function(d) {return(d.x)}) | |
| .attr("cy", function(d) {return(d.y)}) | |
| .attr("r", radius) | |
| .attr("fill", "yellow"); | |
| //create drag handler with d3.drag() | |
| //only interested in "drag" event listener, not "start" or "end" | |
| var drag_handler = d3.drag() | |
| .on("drag", drag_drag); | |
| function drag_drag(d) { | |
| console.log("drag triggered") | |
| d3.select(this) | |
| .attr("cx", d.x = d3.event.x ) | |
| .attr("cy", d.y = d3.event.y ); | |
| }; | |
| //apply the drag_handler to our circles | |
| drag_handler(circles); | |
| //create zoom handler | |
| var zoom_handler = d3.zoom() | |
| .on("zoom", zoom_actions); | |
| //specify what to do when zoom event listener is triggered | |
| function zoom_actions(){ | |
| circles.attr("transform", d3.event.transform); | |
| } | |
| //add zoom behaviour to the rectangle | |
| //same as rect.call(zoom_handler); | |
| zoom_handler(rect); | |
| </script> |
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