This example combines the previous two about zooming and dragging. Care must be taken on avoiding the unwanted propagation of drag events from shapes to the whole SVG.
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August 29, 2015 14:04
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Zoom + drag
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| # data | |
| nodes_data = [ | |
| {x: 0, y: 0}, | |
| {x: 80, y: 80}, | |
| {x: -80, y: 80}, | |
| {x: -80, y: -80}, | |
| {x: 80, y: -80} | |
| ] | |
| svg = d3.select('svg') | |
| width = svg.node().getBoundingClientRect().width | |
| height = svg.node().getBoundingClientRect().height | |
| # translate the viewBox to have (0,0) at the center of the vis | |
| svg | |
| .attr | |
| viewBox: "#{-width/2} #{-height/2} #{width} #{height}" | |
| # append a group for zoomable content | |
| zoomable_layer = svg.append('g') | |
| # define a zoom behavior | |
| zoom = d3.behavior.zoom() | |
| .scaleExtent([0.5,4]) # min-max zoom | |
| .on 'zoom', () -> | |
| # GEOMETRIC ZOOM | |
| zoomable_layer | |
| .attr | |
| transform: "translate(#{zoom.translate()})scale(#{zoom.scale()})" | |
| # bind the zoom behavior to the main SVG | |
| svg.call(zoom) | |
| # define a drag behavior | |
| drag = d3.behavior.drag() | |
| .origin((d) -> d) | |
| drag.on 'dragstart', () -> | |
| # silence other listeners (disbale pan when dragging) | |
| # see https://github.com/mbostock/d3/wiki/Drag-Behavior | |
| d3.event.sourceEvent.stopPropagation() | |
| drag.on 'drag', (d) -> | |
| # update the datum of the dragged node | |
| d.x = d3.event.x | |
| d.y = d3.event.y | |
| # translate the representation | |
| d3.select(this) | |
| .attr | |
| transform: "translate(#{d.x},#{d.y})" | |
| # add draggable nodes | |
| nodes = zoomable_layer.selectAll('.node') | |
| .data(nodes_data) | |
| nodes.enter().append('circle') | |
| .call(drag) # enable dragging for nodes | |
| .attr | |
| class: 'node' | |
| r: 20 | |
| fill: 'orange' | |
| transform: (d) -> "translate(#{d.x},#{d.y})" | |
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| svg { | |
| background: white; | |
| } |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <meta name="description" content="Zoom + drag" /> | |
| <title>Zoom + drag</title> | |
| <link type="text/css" href="index.css" rel="stylesheet"/> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| </head> | |
| <body> | |
| <svg height="500" width="960"></svg> | |
| <script src="index.js"></script> | |
| </body> | |
| </html> |
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| (function() { | |
| var drag, height, nodes, nodes_data, svg, width, zoom, zoomable_layer; | |
| nodes_data = [ | |
| { | |
| x: 0, | |
| y: 0 | |
| }, { | |
| x: 80, | |
| y: 80 | |
| }, { | |
| x: -80, | |
| y: 80 | |
| }, { | |
| x: -80, | |
| y: -80 | |
| }, { | |
| x: 80, | |
| y: -80 | |
| } | |
| ]; | |
| svg = d3.select('svg'); | |
| width = svg.node().getBoundingClientRect().width; | |
| height = svg.node().getBoundingClientRect().height; | |
| svg.attr({ | |
| viewBox: "" + (-width / 2) + " " + (-height / 2) + " " + width + " " + height | |
| }); | |
| zoomable_layer = svg.append('g'); | |
| zoom = d3.behavior.zoom().scaleExtent([0.5, 4]).on('zoom', function() { | |
| return zoomable_layer.attr({ | |
| transform: "translate(" + (zoom.translate()) + ")scale(" + (zoom.scale()) + ")" | |
| }); | |
| }); | |
| svg.call(zoom); | |
| drag = d3.behavior.drag().origin(function(d) { | |
| return d; | |
| }); | |
| drag.on('dragstart', function() { | |
| return d3.event.sourceEvent.stopPropagation(); | |
| }); | |
| drag.on('drag', function(d) { | |
| d.x = d3.event.x; | |
| d.y = d3.event.y; | |
| return d3.select(this).attr({ | |
| transform: "translate(" + d.x + "," + d.y + ")" | |
| }); | |
| }); | |
| nodes = zoomable_layer.selectAll('.node').data(nodes_data); | |
| nodes.enter().append('circle').call(drag).attr({ | |
| "class": 'node', | |
| r: 20, | |
| fill: 'orange', | |
| transform: function(d) { | |
| return "translate(" + d.x + "," + d.y + ")"; | |
| } | |
| }); | |
| }).call(this); |
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