| 1 | <!DOCTYPE html>
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| 2 | <html lang="en">
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| 3 | <head>
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| 4 | <meta charset="utf-8">
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| 5 | <title>math.js | plot</title>
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| 6 | <script src="../../lib/browser/math.js"></script>
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| 7 |
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| 8 | <script src="https://cdn.plot.ly/plotly-1.35.2.min.js"></script>
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| 9 |
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| 10 | <style>
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| 11 | input[type=text] {
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| 12 | width: 300px;
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| 13 | }
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| 14 | input {
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| 15 | padding: 6px;
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| 16 | }
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| 17 | body, html, input {
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| 18 | font-family: sans-serif;
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| 19 | font-size: 11pt;
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| 20 |
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| 21 | }
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| 22 | form {
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| 23 | margin: 20px 0;
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| 24 | }
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| 25 | </style>
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| 26 | </head>
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| 27 | <body>
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| 28 |
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| 29 | <form id="form">
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| 30 | <label for="eq">Enter an equation:</label>
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| 31 | <input type="text" id="eq" value="4 * sin(x) + 5 * cos(x/2)" />
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| 32 | <input type="submit" value="Draw" />
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| 33 | </form>
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| 34 |
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| 35 | <div id="plot"></div>
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| 36 |
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| 37 | <p>
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| 38 | Used plot library: <a href="https://plot.ly/javascript/">Plotly</a>
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| 39 | </p>
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| 40 |
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| 41 | <script>
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| 42 | function draw() {
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| 43 | try {
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| 44 |
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| 45 | const expression = document.getElementById('eq').value
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| 46 | const expr = math.compile(expression)
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| 47 |
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| 48 |
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| 49 | const xValues = math.range(-10, 10, 0.5).toArray()
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| 50 | const yValues = xValues.map(function (x) {
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| 51 | return expr.evaluate({x: x})
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| 52 | })
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| 53 |
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| 54 |
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| 55 | const trace1 = {
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| 56 | x: xValues,
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| 57 | y: yValues,
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| 58 | type: 'scatter'
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| 59 | }
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| 60 | const data = [trace1]
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| 61 | Plotly.newPlot('plot', data)
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| 62 | }
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| 63 | catch (err) {
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| 64 | console.error(err)
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| 65 | alert(err)
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| 66 | }
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| 67 | }
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| 68 |
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| 69 | document.getElementById('form').onsubmit = function (event) {
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| 70 | event.preventDefault()
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| 71 | draw()
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| 72 | }
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| 73 |
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| 74 | draw()
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| 75 | </script>
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| 76 |
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| 77 | </body>
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| 78 | </html>
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