ikeating.github.io/LDL_cholesterol_graph.html at master · ikeating/ikeating.github.io · GitHub

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<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>12/09/2024</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            margin: 20px;
            background-color: #f4f4f4;
            color: #333;
            line-height: 1.6;
        }

        h1, h2 {
            color: #2c3e50;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
            margin: 10px 0;
        }

        .container {
            max-width: 800px;
            margin: 0 auto;
            background: #fff;
            padding: 20px;
            box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
        }

        p {
            margin: 10px 0;
        }

        a {
            color: #3498db;
            text-decoration: none;
        }

        a:hover {
            text-decoration: underline;
        }

        /* Ensure canvas is scrollable on smaller screens */
        .canvas-container {
            width: 100%;
            overflow-x: auto; /* Horizontal scroll for smaller devices */
            margin-bottom: 20px;
            border: 1px solid #ddd;
            background: #f9f9f9;
            padding: 10px;
        }

        canvas {
            display: block;
            margin: 0 auto;
            border: 1px solid black;
        }

        @media (max-width: 768px) {
            body {
                margin: 10px;
            }

            .container {
                padding: 10px;
            }

            h1 {
                font-size: 24px;
            }

            h2 {
                font-size: 18px;
            }
        }
    </style>

    <script type="text/javascript" id="MathJax-script" async
        src="https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js"></script>
</head>

<body>
    <div class="container">
        Back to <a href="index">Homepage</a>

        <h1>iBlog</h1>

        <h2>12/09/2024</h2>
        <p>
            On 09/16/2021, I was prescribed Atorvastatin and have since been taking one 10MG tablet per day.
        </p>

        <div class="canvas-container">
            <canvas id="cholesterolGraph" width="800" height="400"></canvas>
        </div>

        <script>
            const canvas = document.getElementById('cholesterolGraph');
            const ctx = canvas.getContext('2d');

            const data = [
                { date: "2013-04-16", cholesterol: 103 },
                { date: "2015-04-01", cholesterol: 113 },
                { date: "2020-02-13", cholesterol: 160 },
                { date: "2021-09-16", cholesterol: 263 },
                { date: "2022-09-19", cholesterol: 154 },
                { date: "2023-10-20", cholesterol: 135 },
                { date: "2024-12-05", cholesterol: 159 },
            ];

            const cholesterols = data.map(d => d.cholesterol);
            const minCholesterol = Math.min(...cholesterols);
            const maxCholesterol = Math.max(...cholesterols);

            function map(value, minInput, maxInput, minOutput, maxOutput) {
                return ((value - minInput) / (maxInput - minInput)) * (maxOutput - minOutput) + minOutput;
            }

            function drawTitle() {
                ctx.font = "20px Arial";
                ctx.textAlign = "center";
                ctx.fillStyle = "black";
                ctx.fillText("LDL Cholesterol Levels Over Time", canvas.width / 2, 30);
            }

            function drawAxes() {
                ctx.beginPath();
                ctx.moveTo(50, 350);
                ctx.lineTo(50, 50);
                ctx.moveTo(50, 350);
                ctx.lineTo(750, 350);
                ctx.stroke();

                ctx.font = "16px Arial";
                ctx.textAlign = "center";
                ctx.fillText("Date", 400, 390);
                ctx.save();
                ctx.translate(20, 200);
                ctx.rotate(-Math.PI / 2);
                ctx.fillText("LDL Cholesterol Level", 0, 0);
                ctx.restore();
            }

            function drawGridAndLabels() {
                ctx.font = "12px Arial";
                ctx.fillStyle = "black";

                const totalPoints = data.length;
                const xSpacing = (750 - 50) / (totalPoints - 1);

                data.forEach((point, index) => {
                    const x = 50 + index * xSpacing;
                    ctx.fillText(point.date, x, 370);
                    ctx.beginPath();
                    ctx.moveTo(x, 350);
                    ctx.lineTo(x, 50);
                    ctx.strokeStyle = "#ddd";
                    ctx.stroke();
                });

                for (let i = minCholesterol; i <= maxCholesterol; i += 10) {
                    const y = map(i, minCholesterol, maxCholesterol, 350, 50);
                    if (y >= 50 && y <= 350) {
                        ctx.fillText(i, 40, y + 5);
                        ctx.beginPath();
                        ctx.moveTo(50, y);
                        ctx.lineTo(750, y);
                        ctx.strokeStyle = "#ddd";
                        ctx.stroke();
                    }
                }
            }

            function plotData() {
                const totalPoints = data.length;
                const xSpacing = (750 - 50) / (totalPoints - 1);

                data.forEach((point, index) => {
                    const x = 50 + index * xSpacing;
                    const y = map(point.cholesterol, minCholesterol, maxCholesterol, 350, 50);

                    ctx.beginPath();
                    ctx.arc(x, y, 3, 0, 2 * Math.PI);
                    ctx.fillStyle = "blue";
                    ctx.fill();

                    if (index > 0) {
                        const prevX = 50 + (index - 1) * xSpacing;
                        const prevY = map(data[index - 1].cholesterol, minCholesterol, maxCholesterol, 350, 50);

                        ctx.beginPath();
                        ctx.moveTo(prevX, prevY);
                        ctx.lineTo(x, y);
                        ctx.strokeStyle = "blue";
                        ctx.stroke();
                    }
                });
            }

            drawTitle();
            drawAxes();
            drawGridAndLabels();
            plotData();
        </script>

        <p>End of blog. Thank you for reading!</p>
        Back to <a href="index">Homepage</a><br><br>
        © 2024. This work by Isaiah Keating is openly licensed via <a href="https://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>
    </div>
</body>

</html>