goalquiz/makecolor.html at main · code4sabae/goalquiz · GitHub

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<!DOCTYPE html><html><head><meta charset="utf-8"><meta name="viewport" content="width=device-width">
<style>
img {
    width: 5vw;
}
</style>
<script type="module">
import { CSV } from "https://code4sabae.github.io/js/CSV.js";

const pickColorFromImage = (img) => {
    const canvas = document.createElement("canvas");
    canvas.width = 1;
    canvas.height = 1;
    const g = canvas.getContext("2d");
    g.drawImage(img, 0, 0);
    const c = g.getImageData(0, 0, 1, 1).data;
    const hex2 = n => n < 16 ? "0" + n.toString(16) : "" + n.toString(16);
    return "#" + hex2(c[0]) + hex2(c[1]) + hex2(c[2]);
};
const waitImageLoad = async (img) => {
    return new Promise(resolve => img.onload = resolve);
};

window.onload = async () => {
    const baseurl = "https://code4sabae.github.io/SDGs_ja/";
    const goals = CSV.toJSON(await CSV.fetch(baseurl + "SDG-goals.csv"));
    console.log(goals);
    const targets = CSV.toJSON(await CSV.fetch(baseurl + "SDG-targets.csv"));
    console.log(targets);

    const logos = add(document.body, "div");
    const colors = [];
    for (const goal of goals) {
        const img = new Image();
        //img.src = baseurl + goal.logo_ja;
        img.src = goal.logo_ja;
        //img.src = baseurl + goal.logo;
        logos.appendChild(img);
        await waitImageLoad(img);
        const color = pickColorFromImage(img);
        colors.push(color);
    }
    console.log(colors.join("\n"))
};

const add = (parent, tag, txt, link) => {
    const ele = document.createElement(tag);
    if (txt) {
        if (link) {
            const a = add(ele, "a", txt);
            a.href = link;
        } else {
            ele.textContent = txt;
        }
    }
    parent.appendChild(ele);
    return ele;
};

</script>
</head>
<body>
</body>
</html>