Use Dynamic Scales
Hints
Hint 1
Use the .domain()
and .range()
functions.
Hint 2
Use a callback function on the .domain()
function.
Hint 3
Both the .domain()
and .range()
functions accept an array or two elements.
Hint 4
Subtract padding from height to get SVG height including padding.
Solutions
Solution 1 (Click to Show/Hide)
To solve the solution by including all the hints, set the yScale
variable to:
const yScale = d3.scaleLinear()
.domain([0, d3.max(dataset, (d) => d[1])])
.range([h - padding, padding]);
The full solution now looks like:
<body>
<script>
const dataset = [
[ 34, 78 ],
[ 109, 280 ],
[ 310, 120 ],
[ 79, 411 ],
[ 420, 220 ],
[ 233, 145 ],
[ 333, 96 ],
[ 222, 333 ],
[ 78, 320 ],
[ 21, 123 ]
];
const w = 500;
const h = 500;
// Padding between the SVG canvas boundary and the plot
const padding = 30;
// Create an x and y scale
const xScale = d3.scaleLinear()
.domain([0, d3.max(dataset, (d) => d[0])])
.range([padding, w - padding]);
const yScale = d3.scaleLinear()
.domain([0, d3.max(dataset, (d) => d[1])])
.range([h - padding, padding]);
const output = yScale(411);
d3.select("body")
.append("h2")
.text(output);
</script>
</body>