Published
Edited
Oct 10, 2020
1 fork
Importers
chart = {
const wrapper = d3.create('div')
.style('height', '353px')
.style('width', '355px')
.style('padding', '5px')
.style('display', 'flex')
.style('flex-wrap', 'wrap')
.style('justify-content', 'left')
.style('background-color', 'lightgrey')
.style('border', '1px solid darkgrey')
let colorSelected = null,
colorPrev = null,
hexSelected = null;
const updateSelection = () => {
updateColor();
colorSelected.style('background-color', selected.hex());
hexSelected.property('value', selected.hex().toString());
}
const updateFromHex = function() {
const maybeHex = this.value;
if (/^#([0-9A-F]{3}){1,2}$/i.test(maybeHex)) {
const newColor = d3.hsl(maybeHex);
selected.h = newColor.h, selected.s = newColor.s, selected.l = newColor.l;
channels.h = selected.h
colorSelected.style('background-color', selected.hex());
picker.call(renderPicker);
}
}
const colorDrag = function() {
const newCoords = d3.mouse(this);
coords[0] = Math.max(Math.min(newCoords[0], len), 0),
coords[1] = Math.max(Math.min(newCoords[1], len), 0);
updateSelection();
}
const spectrumDrag = function() {
const y = d3.mouse(this)[1];
channels.h = scales.h(y);
picker.call(renderPicker);
updateSelection();
}
const revert = () => {
const c = colorPrev.style('background-color');
const newColor = d3.hsl(c);
selected.h = newColor.h, selected.s = newColor.s, selected.l = newColor.l;
channels.h = selected.h
colorSelected.style('background-color', selected.hex());
hexSelected.property('value', selected.hex().toString());
picker.call(renderPicker);
}
const commit = () => {
previous.h = selected.h, previous.s = selected.s, previous.l = selected.l;
colorPrev.style('background-color', previous.hex());
}
const picker = wrapper
.append('div')
.style('width', `${len}px`)
.style('height', `${len}px`)
.style('margin', '5px')
.style('cursor', 'crosshair')
.style('border', '1px solid darkgrey')
.style('padding', '1px')
.append('canvas')
.attr('width', len)
.attr('height', len)
.call(renderPicker)
.call(d3.drag()
.on('start', colorDrag)
.on('drag', colorDrag));
const spectrum = wrapper
.append('div')
.style('width', '25px')
.style('height', `${len}px`)
.style('margin', '5px')
.style('cursor', 'crosshair')
.style('border', '1px solid darkgrey')
.style('padding', '1px')
.append('canvas')
.attr('width', 1)
.attr('height', `${len}`)
.style('width', '25px')
.style('height', `${len}px`)
.call(renderSpectrum)
.call(d3.drag()
.on('start', spectrumDrag)
.on('drag', spectrumDrag));
const swatches = wrapper
.append('div')
.style('margin', '5px')
.style('padding', '1px')
.style('display', 'flex')
.style('border', '1px solid darkgrey');
colorSelected = swatches
.append('div')
.style('width', '50px')
.style('height', '25px')
.style('background-color', selected.hex());
colorPrev = swatches
.append('div')
.style('width', '50px')
.style('height', '25px')
.style('background-color', previous.hex())
.style('cursor', 'pointer')
.on('click', revert);
hexSelected = wrapper
.append('input')
.style('width', '55px')
.style('height', '22px')
.style('margin', '5px')
.property('value', selected.hex().toString())
.on('input', updateFromHex);
const okInput = wrapper
.append('button')
.text('OK')
.style('width', '70px')
.style('height', '28px')
.style('margin', '5px')
.style('flex-grow', 1)
.on('click', commit);
const cancelInput = wrapper
.append('button')
.text('Cancel')
.style('width', '70px')
.style('height', '28px')
.style('margin', '5px')
.style('flex-grow', 1)
.on('click', revert);
return Object.assign(wrapper.node());
}
updateColor = () => {
selected.h = channels.h;
selected.s = scales.s(coords[0]);
selected.l = scales.l1(coords[0]) * scales.l2(coords[1]);
}
channels = ({ h: 210, s: 1, l: 0.5 });
coords = [len, 0];
selected = d3.hsl(channels.h, channels.s, channels.l);
previous = d3.hsl(channels.h, channels.s, channels.l);
scales = ({
h: d3.scaleLinear().domain([0, len]).range([360, 0]).clamp(true),
l2: d3.scaleLinear().domain([0, len]).range([1, 0]),
l1: d3.scaleLinear().domain([0, len]).range([1, 0.5]),
s: d3.scaleLinear().domain([0, len]).range([0, 1])
})
renderPicker = (g) => {
let i = -1;
const current = d3.hsl(channels.h, channels.s, channels.l);
const ctx = g.node().getContext('2d')
const imageData = ctx.createImageData(len, len);
for (let y = 0; y < len; ++y) {
for (let x = 0, c; x < len; ++x) {
current.s = scales.s(x);
current.l = scales.l1(x) * scales.l2(y);
c = current.rgb();
imageData.data[++i] = c.r;
imageData.data[++i] = c.g;
imageData.data[++i] = c.b;
imageData.data[++i] = 255;
}
}
ctx.putImageData(imageData, 0, 0);
}
renderSpectrum = (g) => {
let i = -1;
const current = d3.hsl(channels.h, channels.s, channels.l);
const ctx = g.node().getContext('2d')
const imageData = ctx.createImageData(1, len);
for (let y = 0, c; y <= len; ++y) {
current.h = scales.h(y);
c = current.rgb();
imageData.data[++i] = c.r;
imageData.data[++i] = c.g;
imageData.data[++i] = c.b;
imageData.data[++i] = 255;
}
ctx.putImageData(imageData, 0, 0);
}
One platform to build and deploy the best data apps
Experiment and prototype by building visualizations in live JavaScript notebooks. Collaborate with your team and decide which concepts to build out.
Use Observable Framework to build data apps locally. Use data loaders to build in any language or library, including Python, SQL, and R.
Seamlessly deploy to Observable. Test before you ship, use automatic deploy-on-commit, and ensure your projects are always up-to-date.