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index.js
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index.js
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/* eslint no-console: 0 */
import createScatterplot from '../src';
const canvas = document.querySelector('#canvas');
const numPointsEl = document.querySelector('#num-points');
const numPointsValEl = document.querySelector('#num-points-value');
const pointSizeEl = document.querySelector('#point-size');
const pointSizeValEl = document.querySelector('#point-size-value');
const opacityEl = document.querySelector('#opacity');
const opacityValEl = document.querySelector('#opacity-value');
const resetEl = document.querySelector('#reset');
const exampleEl = document.querySelector('#example-basic');
exampleEl.setAttribute('class', 'active');
exampleEl.removeAttribute('href');
let { width, height } = canvas.getBoundingClientRect();
let points = [];
let numPoints = 100000;
let pointSize = 2;
let opacity = 0.33;
let selection = [];
const lassoMinDelay = 10;
const lassoMinDist = 2;
const showRecticle = true;
const recticleColor = [1, 1, 0.878431373, 0.33];
const pointoverHandler = (pointId) => {
console.log('Over point:', pointId);
const [x, y, category, value] = points[pointId];
console.log(`X: ${x}\nY: ${y}\nCategory: ${category}\nValue: ${value}`);
};
const pointoutHandler = (pointId) => {
console.log('Out point:', pointId);
const [x, y, category, value] = points[pointId];
console.log(`X: ${x}\nY: ${y}\nCategory: ${category}\nValue: ${value}`);
};
const selectHandler = ({ points: selectedPoints }) => {
console.log('Selected:', selectedPoints);
selection = selectedPoints;
if (selection.length === 1) {
const point = points[selection[0]];
console.log(
`X: ${point[0]}\nY: ${point[1]}\nCategory: ${point[2]}\nValue: ${point[3]}`
);
}
};
const deselectHandler = () => {
console.log('Deselected:', selection);
selection = [];
};
const scatterplot = createScatterplot({
canvas,
width,
height,
lassoMinDelay,
lassoMinDist,
pointSize,
showRecticle,
recticleColor,
});
console.log(scatterplot.get('pointColorActive'));
console.log(`Scatterplot v${scatterplot.get('version')}`);
scatterplot.subscribe('pointover', pointoverHandler);
scatterplot.subscribe('pointout', pointoutHandler);
scatterplot.subscribe('select', selectHandler);
scatterplot.subscribe('deselect', deselectHandler);
const resizeHandler = () => {
({ width, height } = canvas.getBoundingClientRect());
scatterplot.set({ width, height });
};
window.addEventListener('resize', resizeHandler);
const generatePoints = (num) =>
new Array(num).fill().map(() => [
-1 + Math.random() * 2, // x
-1 + Math.random() * 2, // y
Math.round(Math.random()), // category
Math.random(), // value
]);
const setNumPoint = (newNumPoints) => {
numPoints = newNumPoints;
numPointsEl.value = numPoints;
numPointsValEl.innerHTML = numPoints;
points = generatePoints(numPoints);
scatterplot.draw(points);
};
const numPointsInputHandler = (event) => {
numPointsValEl.innerHTML = `${+event.target
.value} <em>release to redraw</em>`;
};
numPointsEl.addEventListener('input', numPointsInputHandler);
const numPointsChangeHandler = (event) => setNumPoint(+event.target.value);
numPointsEl.addEventListener('change', numPointsChangeHandler);
const setPointSize = (newPointSize) => {
pointSize = newPointSize;
pointSizeEl.value = pointSize;
pointSizeValEl.innerHTML = pointSize;
scatterplot.set({ pointSize });
};
const pointSizeInputHandler = (event) => setPointSize(+event.target.value);
pointSizeEl.addEventListener('input', pointSizeInputHandler);
const setOpacity = (newOpacity) => {
opacity = newOpacity;
opacityEl.value = opacity;
opacityValEl.innerHTML = opacity;
scatterplot.set({ opacity });
};
const opacityInputHandler = (event) => setOpacity(+event.target.value);
opacityEl.addEventListener('input', opacityInputHandler);
const resetClickHandler = () => {
scatterplot.reset();
};
resetEl.addEventListener('click', resetClickHandler);
const colorsCat = ['#3a78aa', '#aa3a99'];
scatterplot.set({ colorBy: 'category', pointColor: colorsCat });
const colorsScale = [
'#002072', // dark blue
'#162b79',
'#233680',
'#2e4186',
'#394d8d',
'#425894',
'#4b649a',
'#5570a1',
'#5e7ca7',
'#6789ae',
'#7195b4',
'#7ba2ba',
'#85aec0',
'#90bbc6',
'#9cc7cc',
'#a9d4d2',
'#b8e0d7',
'#c8ecdc',
'#ddf7df',
'#ffffe0', // bright yellow
];
scatterplot.set({ colorBy: 'value', pointColor: colorsScale });
setPointSize(pointSize);
setOpacity(opacity);
setNumPoint(numPoints);