Created
June 24, 2018 23:37
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this is notes about the d3 portion of the fcc code camp
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| d3 on fcc won't let be me |
- loop through using a callback
- don't need to write a for-loop because enter() already go through the data
<body>
<script>
const dataset = [12, 31, 22, 17, 25, 18, 29, 14, 9];
const w = 500;
const h = 100;
const svg = d3.select("body")
.append("svg")
.attr("width", w)
.attr("height", h);
svg.selectAll("rect")
.data(dataset)
.enter()
.append("rect")
.attr("x", (d, i) => i * 30) /* es6 implicit return */
.attr("y", 0)
.attr("width", 25)
.attr("height", 100);
</script>
</body>
- can also return data value in the callback
<body>
<script>
const dataset = [12, 31, 22, 17, 25, 18, 29, 14, 9];
const w = 500;
const h = 100;
const svg = d3.select("body")
.append("svg")
.attr("width", w)
.attr("height", h);
svg.selectAll("rect")
.data(dataset)
.enter()
.append("rect")
.attr("x", (d, i) => i * 30)
.attr("y", 0)
.attr("width", 25)
.attr("height", (d, i) => d * 3);
</script>
</body>
https://learn.freecodecamp.org/data-visualization/data-visualization-with-d3/invert-svg-elements
mis typically the multiplier for the data relationship to the actual ratio-
In general, the relationship is y = h - m * d, where m is the constant that scales the data points.
- wanted to make the multiplication more explicit with parens
- have to accomodate how d3 scales things with the top upper being 0,0 by subtracting from height
<body>
<script>
const dataset = [12, 31, 22, 17, 25, 18, 29, 14, 9];
const w = 500;
const h = 100;
const svg = d3.select("body")
.append("svg")
.attr("width", w)
.attr("height", h);
svg.selectAll("rect")
.data(dataset)
.enter()
.append("rect")
.attr("x", (d, i) => i * 30)
.attr("y", (d, i) => h - (3 * d))
.attr("width", 25)
.attr("height", (d, i) => 3 * d);
</script>
</body>
fillattribute is what makes up the elements
<body>
<script>
const dataset = [12, 31, 22, 17, 25, 18, 29, 14, 9];
const w = 500;
const h = 100;
const svg = d3.select("body")
.append("svg")
.attr("width", w)
.attr("height", h);
svg.selectAll("rect")
.data(dataset)
.enter()
.append("rect")
.attr("x", (d, i) => i * 30)
.attr("y", (d, i) => h - 3 * d)
.attr("width", 25)
.attr("height", (d, i) => 3 * d)
.attr('fill', 'navy')
</script>
</body>
- Not sure why
dreturns itself but ok, guess it could be anything - Weird have to subtract to go HIGHER
<body>
<script>
const dataset = [12, 31, 22, 17, 25, 18, 29, 14, 9];
const w = 500;
const h = 100;
const svg = d3.select("body")
.append("svg")
.attr("width", w)
.attr("height", h);
svg.selectAll("rect")
.data(dataset)
.enter()
.append("rect")
.attr("x", (d, i) => i * 30)
.attr("y", (d, i) => h - 3 * d)
.attr("width", 25)
.attr("height", (d, i) => 3 * d)
.attr("fill", "navy");
svg.selectAll("text")
.data(dataset)
.enter()
.append('text')
.attr('x', (d, i) => i * 30)
/* three units higher is subtraction */
.attr('y', (d, i) => h - (3 * d) - 3)
.text(d => d) /* returns d data value */
</script>
<body>
https://learn.freecodecamp.org/data-visualization/data-visualization-with-d3/style-d3-labels
- even text has a
fillcolor property
<body>
<script>
const dataset = [12, 31, 22, 17, 25, 18, 29, 14, 9];
const w = 500;
const h = 100;
const svg = d3.select("body")
.append("svg")
.attr("width", w)
.attr("height", h);
svg.selectAll("rect")
.data(dataset)
.enter()
.append("rect")
.attr("x", (d, i) => i * 30)
.attr("y", (d, i) => h - 3 * d)
.attr("width", 25)
.attr("height", (d, i) => d * 3)
.attr("fill", "navy");
svg.selectAll("text")
.data(dataset)
.enter()
.append("text")
.text((d) => d)
.attr("x", (d, i) => i * 30)
.attr("y", (d, i) => h - (3 * d) - 3)
.style('font-size', '25px')
.style('fill', 'red')
</script>
</body>
- add a class via attr
<style>
.bar:hover {
fill: brown;
}
</style>
<body>
<script>
const dataset = [12, 31, 22, 17, 25, 18, 29, 14, 9];
const w = 500;
const h = 100;
const svg = d3.select("body")
.append("svg")
.attr("width", w)
.attr("height", h);
svg.selectAll("rect")
.data(dataset)
.enter()
.append("rect")
.attr("x", (d, i) => i * 30)
.attr("y", (d, i) => h - 3 * d)
.attr("width", 25)
.attr("height", (d, i) => 3 * d)
.attr("fill", "navy")
.attr('class', 'bar')
svg.selectAll("text")
.data(dataset)
.enter()
.append("text")
.text((d) => d)
.attr("x", (d, i) => i * 30)
.attr("y", (d, i) => h - (3 * d) - 3);
</script>
</body>
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https://learn.freecodecamp.org/data-visualization/data-visualization-with-d3/create-a-bar-for-each-data-point-in-the-set
rectsmust be appended to an svg element before appended to the body