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.
Last active
August 29, 2015 14:04
-
-
Save nitaku/9cba6c39cc335725f09f to your computer and use it in GitHub Desktop.
Zoom + drag
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
# 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})" | |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
svg { | |
background: white; | |
} |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
<!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> |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
(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); |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment