MATLAB-uicolorpicker/ColorPicker.html at main · sitdownplz/MATLAB-uicolorpicker · GitHub

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<!DOCTYPE html>

<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head>
    <meta charset="utf-8" />
    <title></title>
    <style>
        .spectrum-wrapper {
            cursor: crosshair;
            width: 240px;
            position: relative;
            height: 120px;
            user-select: none;
            user-drag: none;
            margin: 0 auto;
            /*outline: 0px solid black;*/
        }

        .spectrum-layer {
            height: 100%;
            width: 100%;
            background: linear-gradient( to right, rgb(255 0 0), rgb(255 255 0), rgb(0 255 0), rgb(0 255 255), rgb(0 0 255), rgb(255 0 255), rgb(255 0 0) );
            border-radius: 5px;
        }

        .saturation-white {
            background: -webkit-linear-gradient(to top, rgba(255, 255, 255, 0), #fff);
            background: linear-gradient(to top, rgba(255, 255, 255, 0), #fff);
            position: absolute;
            width: 100%;
            height: 60px;
            top: 0px;
            right: 0px;
            bottom: 60px;
            left: 0px;
            border-radius: 5px;
        }

        .saturation-black {
            background: -webkit-linear-gradient(to bottom, rgba(0, 0, 0, 0), #000);
            background: linear-gradient(to bottom, rgba(0, 0, 0, 0), #000);
            position: absolute;
            width: 100%;
            height: 60px;
            top: 60px;
            right: 0px;
            bottom: 0px;
            border-radius: 5px;
        }
    </style>
</head>

<body>
    <div class="spectrum-wrapper">
        <div class="spectrum-layer"></div>
        <div class="saturation-white"></div>
        <div class="saturation-black"></div>
    </div>

    <!--<div>Red: <span class="red"></span></div>-->
    <div><!--Green: <span class="green"></span>--></div>
    <div><!--Blue: <span class="blue"></span>--></div>
    <div><!--<br />Hex: <span class="hex"></span>--></div>

    <script>
        // Initial function for MATLAB data exchange
        function setup(htmlComponent) {

            const getSpectrumWrapper = () => document.querySelector(".spectrum-wrapper");


            const spectrumRanges = [
                { from: [255, 0, 0], to: [255, 255, 0] },
                { from: [255, 255, 0], to: [0, 255, 0] },
                { from: [0, 255, 0], to: [0, 255, 255] },
                { from: [0, 255, 255], to: [0, 0, 255] },
                { from: [0, 0, 255], to: [255, 0, 255] },
                { from: [255, 0, 255], to: [255, 0, 0] }
            ];

            const findColorValue = (from, to, leftDistRatio) => {
                return Math.round(from + (to - from) * leftDistRatio);
            };

            const findRgbFromMousePosition = (event) => {
                const { left, width } = getSpectrumWrapper().getBoundingClientRect();
                const leftDistance = Math.min(Math.max(event.clientX - left, 0), width - 1);
                const rangeWidth = width / spectrumRanges.length;
                const includedRange = Math.floor(leftDistance / rangeWidth);
                const leftDistRatio = ((leftDistance % rangeWidth) / rangeWidth).toFixed(2);
                const { from, to } = spectrumRanges[includedRange];
                return {
                    r: findColorValue(from[0], to[0], leftDistRatio),
                    g: findColorValue(from[1], to[1], leftDistRatio),
                    b: findColorValue(from[2], to[2], leftDistRatio)
                };
            };

            const darken = (color, ratio) => Math.round((1 - ratio) * color);
            const whiten = (color, ratio) => Math.round(color + (255 - color) * ratio);
            const adjustSaturation = ({ r, g, b }) => (ratio, adjustmentFn) => {
                return {
                    r: adjustmentFn(r, ratio),
                    g: adjustmentFn(g, ratio),
                    b: adjustmentFn(b, ratio)
                };
            };

            const saturate = (rgb, e) => {
                const { top, height } = getSpectrumWrapper().getBoundingClientRect();
                const topDistance = Math.min(Math.max(e.clientY - top, 0), height);
                const topDistRatio = (topDistance / height).toFixed(2);
                if (topDistRatio > 0.5) {
                    const darknessRatio = (topDistRatio - 0.5) / 0.5;
                    return adjustSaturation(rgb)(darknessRatio, darken);
                }
                if (topDistRatio < 0.5) {
                    const whitenessRatio = (0.5 - topDistRatio) / 0.5;
                    return adjustSaturation(rgb)(whitenessRatio, whiten);
                }
                return rgb;
            };

            const rgbToHex = (r, g, b) => {
                const toHex = (rgb) => {
                    let hex = Number(rgb).toString(16);
                    if (hex.length < 2) {
                        hex = `0${hex}`;
                    }
                    return hex;
                };
                const red = toHex(r);
                const green = toHex(g);
                const blue = toHex(b);
                return `#${red}${green}${blue}`;
            };

            getSpectrumWrapper().addEventListener("click", (e) => {
                const rgb = findRgbFromMousePosition(e);
                const { r, g, b } = saturate(rgb, e);
                const hexValue = rgbToHex(r, g, b);
                //document.querySelector(".red").innerText = r;
                //document.querySelector(".green").innerText = g;
                //document.querySelector(".blue").innerText = b;
                //document.querySelector(".hex").innerText = hexValue;
                htmlComponent.Data = [r, g, b]; //Return result to MATLAB in array
            });
        }
    </script>

</body>
</html>