A variant of the simple bar chart using d3-scale and d3-request to render to Canvas.
Canvas Bar Chart
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
license: gpl-3.0 |
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
letter | frequency | |
---|---|---|
A | .08167 | |
B | .01492 | |
C | .02782 | |
D | .04253 | |
E | .12702 | |
F | .02288 | |
G | .02015 | |
H | .06094 | |
I | .06966 | |
J | .00153 | |
K | .00772 | |
L | .04025 | |
M | .02406 | |
N | .06749 | |
O | .07507 | |
P | .01929 | |
Q | .00095 | |
R | .05987 | |
S | .06327 | |
T | .09056 | |
U | .02758 | |
V | .00978 | |
W | .02360 | |
X | .00150 | |
Y | .01974 | |
Z | .00074 |
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> | |
<meta charset="utf-8"> | |
<canvas width="960" height="500"></canvas> | |
<script src="//d3js.org/d3.v4.0.0-alpha.4.min.js"></script> | |
<script> | |
var canvas = document.querySelector("canvas"), | |
context = canvas.getContext("2d"); | |
var margin = {top: 20, right: 20, bottom: 30, left: 40}, | |
width = canvas.width - margin.left - margin.right, | |
height = canvas.height - margin.top - margin.bottom; | |
var x = d3.scaleBand() | |
.rangeRound([0, width]) | |
.padding(0.1); | |
var y = d3.scaleLinear() | |
.rangeRound([height, 0]); | |
context.translate(margin.left, margin.top); | |
d3.requestTsv("data.tsv", function(d) { | |
d.frequency = +d.frequency; | |
return d; | |
}, function(error, data) { | |
if (error) throw error; | |
x.domain(data.map(function(d) { return d.letter; })); | |
y.domain([0, d3.max(data, function(d) { return d.frequency; })]); | |
var yTickCount = 10, | |
yTicks = y.ticks(yTickCount), | |
yTickFormat = y.tickFormat(yTickCount, "%"); | |
context.beginPath(); | |
x.domain().forEach(function(d) { | |
context.moveTo(x(d) + x.bandwidth() / 2, height); | |
context.lineTo(x(d) + x.bandwidth() / 2, height + 6); | |
}); | |
context.strokeStyle = "black"; | |
context.stroke(); | |
context.textAlign = "center"; | |
context.textBaseline = "top"; | |
x.domain().forEach(function(d) { | |
context.fillText(d, x(d) + x.bandwidth() / 2, height + 6); | |
}); | |
context.beginPath(); | |
yTicks.forEach(function(d) { | |
context.moveTo(0, y(d) + 0.5); | |
context.lineTo(-6, y(d) + 0.5); | |
}); | |
context.strokeStyle = "black"; | |
context.stroke(); | |
context.textAlign = "right"; | |
context.textBaseline = "middle"; | |
yTicks.forEach(function(d) { | |
context.fillText(yTickFormat(d), -9, y(d)); | |
}); | |
context.beginPath(); | |
context.moveTo(-6.5, 0 + 0.5); | |
context.lineTo(0.5, 0 + 0.5); | |
context.lineTo(0.5, height + 0.5); | |
context.lineTo(-6.5, height + 0.5); | |
context.strokeStyle = "black"; | |
context.stroke(); | |
context.save(); | |
context.rotate(-Math.PI / 2); | |
context.textAlign = "right"; | |
context.textBaseline = "top"; | |
context.font = "bold 10px sans-serif"; | |
context.fillText("Frequency", -10, 10); | |
context.restore(); | |
context.fillStyle = "steelblue"; | |
data.forEach(function(d) { | |
context.fillRect(x(d.letter), y(d.frequency), x.bandwidth(), height - y(d.frequency)); | |
}); | |
}); | |
</script> |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment