An example that uses SVG patterns to color intersecting regions by using a diagonal hatch (colors are HCL opposites with equal chroma and lightness, see this).
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March 14, 2019 14:57
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Coloring of intersecting regions
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### get a D3 reference of the SVG ### | |
svg = d3.select('svg') | |
vis = svg.append('g') | |
.attr('transform', 'translate(290,50)') | |
### define two colors ### | |
A = '#ea9679' | |
B = '#00bbdd' | |
### create hatch patterns ### | |
hatches = [ | |
{size:40,c1:A,c2:B,id:'one'} | |
] | |
defs = svg.append('defs') | |
new_patterns = defs.selectAll('.hatch') | |
.data(hatches) | |
.enter().append('pattern') | |
.attr('class', 'hatch') | |
.attr('id', (d)->d.id) | |
.attr('patternUnits', 'userSpaceOnUse') | |
.attr('width', (d)->d.size) | |
.attr('height', (d)->d.size) | |
new_patterns.append('rect') | |
.attr('x',0) | |
.attr('y',0) | |
.attr('width', (d)->d.size) | |
.attr('height', (d)->d.size) | |
.attr('fill', (d)->d.c1) | |
new_patterns.append('path') | |
.attr('d', (d)->""" | |
M0 #{d.size} l#{d.size} #{-d.size} | |
M#{-d.size} #{d.size} L#{d.size} #{-d.size} | |
M#{2*d.size} 0 L0 #{2*d.size} | |
""") | |
.attr('stroke-width', (d)->d.size/3) | |
.attr('stroke', (d)->d.c2) | |
### create a fake intersection of two squares ### | |
vis.append('path') | |
.attr('d', 'M0 0 l300 0 l0 100 l-200 0 l0 200 l-100 0 z') | |
.attr('fill', A) | |
vis.append('path') | |
.attr('d', 'M300 100 l100 0 l0 300 l-300 0 l0 -100 l200 0 z') | |
.attr('fill', B) | |
vis.append('rect') | |
.attr('x', 100) | |
.attr('y', 100) | |
.attr('width', 200) | |
.attr('height', 200) | |
.attr('fill', 'url(#one)') |
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<!DOCTYPE html> | |
<html> | |
<head> | |
<meta charset="utf-8"> | |
<meta name="description" content="Coloring of intersecting regions"/> | |
<title>Coloring of intersecting regions</title> | |
<script src="http://d3js.org/d3.v3.min.js"></script> | |
</head> | |
<body> | |
<svg width="960" height="500"> | |
</svg> | |
<script src="index.js"></script> | |
</html> |
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/* get a D3 reference of the SVG | |
*/ | |
(function() { | |
var A, B, defs, hatches, new_patterns, svg, vis; | |
svg = d3.select('svg'); | |
vis = svg.append('g').attr('transform', 'translate(290,50)'); | |
/* define two colors | |
*/ | |
A = '#ea9679'; | |
B = '#00bbdd'; | |
/* create hatch patterns | |
*/ | |
hatches = [ | |
{ | |
size: 40, | |
c1: A, | |
c2: B, | |
id: 'one' | |
} | |
]; | |
defs = svg.append('defs'); | |
new_patterns = defs.selectAll('.hatch').data(hatches).enter().append('pattern').attr('class', 'hatch').attr('id', function(d) { | |
return d.id; | |
}).attr('patternUnits', 'userSpaceOnUse').attr('width', function(d) { | |
return d.size; | |
}).attr('height', function(d) { | |
return d.size; | |
}); | |
new_patterns.append('rect').attr('x', 0).attr('y', 0).attr('width', function(d) { | |
return d.size; | |
}).attr('height', function(d) { | |
return d.size; | |
}).attr('fill', function(d) { | |
return d.c1; | |
}); | |
new_patterns.append('path').attr('d', function(d) { | |
return "M0 " + d.size + " l" + d.size + " " + (-d.size) + "\nM" + (-d.size) + " " + d.size + " L" + d.size + " " + (-d.size) + "\nM" + (2 * d.size) + " 0 L0 " + (2 * d.size); | |
}).attr('stroke-width', function(d) { | |
return d.size / 3; | |
}).attr('stroke', function(d) { | |
return d.c2; | |
}); | |
/* create a fake intersection of two squares | |
*/ | |
vis.append('path').attr('d', 'M0 0 l300 0 l0 100 l-200 0 l0 200 l-100 0 z').attr('fill', A); | |
vis.append('path').attr('d', 'M300 100 l100 0 l0 300 l-300 0 l0 -100 l200 0 z').attr('fill', B); | |
vis.append('rect').attr('x', 100).attr('y', 100).attr('width', 200).attr('height', 200).attr('fill', 'url(#one)'); | |
}).call(this); |
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