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February 23, 2018 16:18
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CMYK zoom
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<!DOCTYPE html> | |
<meta charset="utf-8"> | |
<body> | |
<script src="//d3js.org/d3.v4.min.js"></script> | |
<script> | |
var width = 960, | |
height = 500; | |
var svg = d3.select("body").append("svg") | |
.attr("width", width) | |
.attr("height", height); | |
var defs = svg.append("defs"); | |
var background = svg.append("g") | |
.attr("class", "dots"); | |
// r=0 is a Chrome bug | |
var radius = d3.scaleSqrt() | |
.range([1e-9, 9]); | |
var colors = [ | |
["yellow", 0], | |
["magenta", -15], | |
["cyan", 15], | |
["black", 45] | |
]; | |
var patterns = defs.selectAll("pattern") | |
.data(colors) | |
.enter() | |
.append("pattern") | |
.attr("id", function(d){ | |
return d[0]; | |
}) | |
.attr("patternUnits", "userSpaceOnUse") | |
.attr("width", 18) | |
.attr("height", 18) | |
.append("circle") | |
.attr("fill", function(d){ | |
return d[0]; | |
}) | |
.attr("cx", 9) | |
.attr("cy", 9); | |
var dots = svg.append("g") | |
.attr("class", "dots"); | |
dots.append("rect") | |
.attr("width", width) | |
.attr("height", height) | |
.attr("fill", "#fff"); | |
dots.selectAll(".color") | |
.data(colors) | |
.enter() | |
.append("rect") | |
.attr("class", "color") | |
.attr("width", width * 40) | |
.attr("height", width * 40) | |
.attr("x", width * -30 / 2) | |
.attr("y", width * -30 / 2) | |
.attr("fill", function(d){ | |
return "url(#" + d[0] + ")"; | |
}) | |
.style("mix-blend-mode", "multiply") | |
.attr("transform", function(d){ | |
return d[1] ? "rotate(" + d[1] + " " + (width / 2) + " " + (height / 2) + ")" : null; | |
}); | |
zoom(0); | |
function zoom(p) { | |
var color = d3.interpolateRainbow(p % 1), | |
cmyk = rgbToCmyk(d3.color(color)); | |
patterns.transition() | |
.duration(500) | |
.attr("r", function(d){ | |
return radius(cmyk[d[0]]); | |
}) | |
.on("end", function(){ | |
dots.transition() | |
.delay(500) | |
.duration(4000) | |
.attr("transform", "translate( " + (width / 2) + " " + (height / 2) + ") scale(0.05 0.05)") | |
.transition() | |
.delay(1000) | |
.attr("transform", "translate(0 0) scale(1 1)") | |
.on("end", function(){ | |
zoom(p + 0.15); | |
}); | |
}); | |
} | |
function rgbToCmyk(rgb) { | |
var r = rgb.r / 255, | |
g = rgb.g / 255, | |
b = rgb.b / 255, | |
k = 1 - Math.max(r, g, b); | |
return { | |
cyan: (1 - r - k) / (1 - k), | |
magenta: (1 - g - k) / (1 - k), | |
yellow: (1 - b - k) / (1 - k), | |
black: k | |
}; | |
} | |
</script> |
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Excellent demonstration of both CMYK and D3.
For some reason, on my screen it zooms out seeming to make one colour, then "snaps" to a slightly different colour (�for example, from almost salmon to a magenta).