A simple example of a rectangular adjacency matrix. The scaleBand.padding()
method is not used because it is less flexible than using pixel math. This way, we can use pixel-based paddings and still be able to use the scale to address a specific cell without having to correct pixel values by taking the unknown padding amount into account.
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November 9, 2016 13:23
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Rectangular adjacency matrix
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# DATA | |
links = [ | |
{a: 'Italy', b: 'Italian'}, | |
{a: 'Germany', b: 'German'}, | |
{a: 'France', b: 'French'}, | |
{a: 'Spain', b: 'Spanish'}, | |
{a: 'Switzerland', b: 'Italian'}, | |
{a: 'Switzerland', b: 'German'}, | |
{a: 'Switzerland', b: 'French'} | |
] | |
a_ids = (d3.set (links.map (d) -> d.a)).values() | |
b_ids = (d3.set (links.map (d) -> d.b)).values() | |
# LAYOUT | |
# try to fit this rectangle with the matrix | |
matrix_w = 400 | |
matrix_h = 400 | |
a_n = a_ids.length | |
b_n = b_ids.length | |
cellsize = Math.min matrix_w/b_n, matrix_h/a_n # beware! a is y and b is x! | |
a_ids.sort() | |
b_ids.sort() | |
x = d3.scaleBand() | |
.domain b_ids # beware! a is y and b is x! | |
.range [-cellsize*b_n/2, cellsize*b_n/2] # centered in (0,0) | |
y = d3.scaleBand() | |
.domain a_ids | |
.range [-cellsize*a_n/2, cellsize*a_n/2] | |
# VIS | |
svg = d3.select 'svg' | |
width = svg.node().getBoundingClientRect().width | |
height = svg.node().getBoundingClientRect().height | |
# center the vis on (0,0) | |
vis = svg.append 'g' | |
.attrs | |
transform: "translate(#{width/2},#{height/2})" | |
# draw a background | |
background = vis.append 'rect' | |
.attrs | |
class: 'background' | |
x: x.range()[0] | |
y: y.range()[0] | |
width: x.range()[1]-x.range()[0] | |
height: y.range()[1]-y.range()[0] | |
# draw cells | |
cells = vis.selectAll '.cell' | |
.data links, (d) -> "#{d.a}--#{d.b}" | |
en_cells = cells.enter().append 'rect' | |
.attrs | |
class: 'cell' | |
all_cells = en_cells.merge cells | |
all_cells | |
.attrs | |
x: (d) -> x(d.b) + 0.5 | |
y: (d) -> y(d.a) + 0.5 | |
width: x.bandwidth() - 1 | |
height: y.bandwidth() - 1 | |
cells.exit().remove() |
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body, html { | |
padding: 0; | |
margin: 0; | |
height: 100%; | |
} | |
svg { | |
width: 100%; | |
height: 100%; | |
background: white; | |
} | |
.background { | |
fill: #EEE; | |
} | |
.cell { | |
fill: teal; | |
shape-rendering: crispEdges; | |
} |
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<!DOCTYPE html> | |
<html> | |
<head> | |
<meta charset="utf-8"> | |
<title>Rectangular adjacency matrix</title> | |
<link type="text/css" href="index.css" rel="stylesheet"/> | |
<script src="https://d3js.org/d3.v4.min.js"></script> | |
<script src="https://d3js.org/d3-selection-multi.v0.4.min.js"></script> | |
</head> | |
<body> | |
<svg></svg> | |
<script src="index.js"></script> | |
</body> | |
</html> |
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// Generated by CoffeeScript 1.10.0 | |
(function() { | |
var a_ids, a_n, all_cells, b_ids, b_n, background, cells, cellsize, en_cells, height, links, matrix_h, matrix_w, svg, vis, width, x, y; | |
links = [ | |
{ | |
a: 'Italy', | |
b: 'Italian' | |
}, { | |
a: 'Germany', | |
b: 'German' | |
}, { | |
a: 'France', | |
b: 'French' | |
}, { | |
a: 'Spain', | |
b: 'Spanish' | |
}, { | |
a: 'Switzerland', | |
b: 'Italian' | |
}, { | |
a: 'Switzerland', | |
b: 'German' | |
}, { | |
a: 'Switzerland', | |
b: 'French' | |
} | |
]; | |
a_ids = (d3.set(links.map(function(d) { | |
return d.a; | |
}))).values(); | |
b_ids = (d3.set(links.map(function(d) { | |
return d.b; | |
}))).values(); | |
matrix_w = 400; | |
matrix_h = 400; | |
a_n = a_ids.length; | |
b_n = b_ids.length; | |
cellsize = Math.min(matrix_w / b_n, matrix_h / a_n); | |
a_ids.sort(); | |
b_ids.sort(); | |
x = d3.scaleBand().domain(b_ids).range([-cellsize * b_n / 2, cellsize * b_n / 2]); | |
y = d3.scaleBand().domain(a_ids).range([-cellsize * a_n / 2, cellsize * a_n / 2]); | |
svg = d3.select('svg'); | |
width = svg.node().getBoundingClientRect().width; | |
height = svg.node().getBoundingClientRect().height; | |
vis = svg.append('g').attrs({ | |
transform: "translate(" + (width / 2) + "," + (height / 2) + ")" | |
}); | |
background = vis.append('rect').attrs({ | |
"class": 'background', | |
x: x.range()[0], | |
y: y.range()[0], | |
width: x.range()[1] - x.range()[0], | |
height: y.range()[1] - y.range()[0] | |
}); | |
cells = vis.selectAll('.cell').data(links, function(d) { | |
return d.a + "--" + d.b; | |
}); | |
en_cells = cells.enter().append('rect').attrs({ | |
"class": 'cell' | |
}); | |
all_cells = en_cells.merge(cells); | |
all_cells.attrs({ | |
x: function(d) { | |
return x(d.b) + 0.5; | |
}, | |
y: function(d) { | |
return y(d.a) + 0.5; | |
}, | |
width: x.bandwidth() - 1, | |
height: y.bandwidth() - 1 | |
}); | |
cells.exit().remove(); | |
}).call(this); |
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