Created
November 7, 2017 14:26
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Pan and zoom, d3.js version 4
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| </head> | |
| <body> | |
| <script src="http://d3js.org/d3.v4.min.js"></script> | |
| <script src="https://d3js.org/d3-selection-multi.v1.min.js"></script> | |
| <script> | |
| var width = 450, height = 450, radius = 50; | |
| var zoomBehavior = d3.zoom() | |
| .scaleExtent([0.1, 10]) | |
| .on('zoom', onZoom); | |
| var svg = d3.select('body') | |
| .append('svg') | |
| .attrs({ | |
| width: width, | |
| height: height | |
| }) | |
| .call(zoomBehavior) | |
| .append('g'); | |
| var data = [ | |
| [width / 2 - radius, height / 2 - radius], | |
| [width / 2 - radius, height / 2 + radius], | |
| [width / 2 + radius, height / 2 - radius], | |
| [width / 2 + radius, height / 2 + radius]]; | |
| var colors = d3.schemeCategory10; | |
| var circles = svg.selectAll('circle') | |
| .data(data) | |
| .enter() | |
| .append('circle') | |
| .attrs({ | |
| r: radius, | |
| fill: function (d,i) { return colors[i]; }, | |
| transform: function (d) { return 'translate(' + d + ')' } | |
| }); | |
| var dragBehavior = d3.drag() | |
| .on('drag', onDrag) | |
| .on('start', function () { | |
| d3.event.sourceEvent.stopPropagation(); | |
| }); | |
| // Applies this drag behavior to the specified selection. | |
| circles.call(dragBehavior); | |
| function onDrag(d) { | |
| var x = d3.event.x, | |
| y = d3.event.y; | |
| if ((x >= radius) && (x <= width - radius) && | |
| (y >= radius) && (y <= height - radius)) { | |
| d3.select(this) | |
| .attr('transform', function () { | |
| return 'translate(' + x + ', ' + y + ')'; | |
| }); | |
| } | |
| } | |
| function onZoom() { | |
| svg.attr('transform', 'translate(' + d3.event.transform.x +', '+ d3.event.transform.y + ')' + | |
| 'scale(' + d3.event.transform.k + ')'); | |
| } | |
| </script> | |
| </body> | |
| </html> |
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