QuestionSets/screenshot.html at master · MatzElectronics/QuestionSets · GitHub

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

<head>
    <title>Screenshot Practice</title>
    <link rel="preconnect" href="https://fonts.googleapis.com">
    <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
    <link href="https://fonts.googleapis.com/css2?family=Lato:ital,wght@0,400;0,700;1,400;1,700&display=swap" rel="stylesheet">
    <style>
        *, body {
            font-family: 'Lato', sans-serif;
        }

        #sampleCanvas {
            height: 480px;
            width: 640px;
        }

        #imageCanvas,
        #frameCanvas {
            display: none;
        }

        .image-row {
            display: flex;
            justify-content: space-evenly;
            align-items: center;
        }

        h2,
        p {
            text-align: center;
        }

        h2 {
            font-size: 28px;
            margin-bottom: 10px;
        }

        .mac-keys {
            width: 20vw;
            margin: 15px;
        }

        .results {
            font-size: 20px;
        }

        .drop-shadow {
            box-shadow: 4px 4px 12px 2px rgb(0 0 0 / 50%);
            border: 1px solid white;
        }

        #image-loader {
            display: none;
        }

        button,
        label[for="image-loader"] {
            display: inline-block;
            padding: 12px 24px;
            margin: 0;
            font-size: 20px !important;
            font-weight: 400;
            line-height: 17px;
            text-align: center;
            white-space: nowrap;
            vertical-align: middle;
            -ms-touch-action: manipulation;
            touch-action: manipulation;
            cursor: pointer;
            -webkit-user-select: none;
            -moz-user-select: none;
            -ms-user-select: none;
            user-select: none;
            background-image: none;
            border: 1px solid transparent;
            border-radius: 4px;
            color: #fff;
            background-color: #337ab7;
            border-color: #2e6da4;
            font-weight: 700;
        }


        button:focus,
        button:hover,
        label[for="image-loader"]:hover,
        label[for="image-loader"]:focus {
            outline: none;
            filter: brightness(0.85);
        }
    </style>

    <script src="resemble.js"></script>
    <script src="common_utils.js"></script>


</head>

<body>

    <h2>
        Screenshot Practice
    </h2>
    <div class="instructions">
        <p>
            Use the <br>
            <img class="mac-keys" src="https://support.apple.com/library/content/dam/edam/applecare/images/en_US/accessories/Keyboards/mac-key-combo-diagram-shift-command-4.png"/><br>
            keys to take a capture of the area <i>just inside of</i> the box in the image below:
        </p>
    </div>
    <div class="image-row">
        <canvas id="sampleCanvas" class="drop-shadow"></canvas>
        <canvas id="frameCanvas"></canvas>
    </div>

    <div class="instructions">
        <p>Then, click</p>
        <p><label for="image-loader">Upload Image</label>
        <input type="file" id="image-loader" name="image-loader"/></p>
        <p>to upload the screenshot you<br/>took and see how well you did!</p>
    </div>

    <canvas id="imageCanvas"></canvas>

    <br/>

    <div class="image-row">
        <div id="div-select">
            <p>Your Selection:</p>
            <img class="drop-shadow" id="img-select"/>
        </div>
        <div id="div-frame">
            <p>Target Selection:</p>
            <img class="drop-shadow" id="img-frame"/>
        </div>
        <div id="div-output">
            <p>Difference:</p>
            <img class="drop-shadow" id="img-output"/>
        </div>
    </div>

    <div class="results">
        <p style="margin-top: 55px;">Your screenshot is a <b><span id="diff-value">0</span>%</b> match to the target.</p>
        <p>
            <span class="feedback" id="feedback-great">You did great!</span>
            <span class="feedback" id="feedback-good">You did well!  Keep practicing to try and get even closer to the edges of the target!</span>
            <span class="feedback" id="feedback-okay">You did okay - keep practicing to get closer to the edges of the target!</span>
            <span class="feedback" id="feedback-poor">Make sure you selected <b>inside</b> the box<br/>and make sure that you uploaded the correct file.</span>
        </p>
        <p id="stars"></p>
        <p><button id="try-again">Try another!</button></p>
    </div>

    <script>
        let imageLoader = $('#image-loader');
        imageLoader.addEventListener('change', handleImage, false);

        $('#try-again').addEventListener('click', setupImages);

        let imgCanvas = $('#imageCanvas');
        let imgCtx = imgCanvas.getContext('2d');

        let sampCanvas = $('#sampleCanvas');
        let sampCtx = sampCanvas.getContext('2d');

        let frameCanvas = $('#frameCanvas');
        let frameCtx = frameCanvas.getContext('2d');

        let file = null;

        let randomBox = { left: 0, top: 0, width: 0, height: 0 };

        function handleImage(e) {
            var reader = new FileReader();
            reader.onload = function (event) {
                var img = new Image();
                img.crossOrigin="anonymous";
                img.onload = function () {
                    let scale = 400 / img.width;
                    let w = 400;
                    let h = Math.floor(img.height * scale);
                    if (img.height > (img.width * .75)) {
                        scale = 300 / img.height;
                        h = 300;
                        w = Math.floor(img.width * scale);
                    }
                    imgCanvas.width = w // img.width;
                    imgCanvas.height = h;
                    imgCtx.drawImage(img, 0, 0, 400, 300);

                }
                img.src = event.target.result;
                $('#img-select').src = event.target.result;
            }
            reader.readAsDataURL(e.target.files[0]);
            file = e.target.files[0];

            compareImages();
        }

        function setupImages() {
            $('#div-frame').style.display = 'none';
            $('#div-select').style.display = 'none';
            $('#div-output').style.display = 'none';
            sampCanvas.style.display = 'unset';

            $('.results').style.display = 'none';
            let feedbackElements = $$('.feedback');
            for (let i = 0; i < feedbackElements.length; i++) {
                feedbackElements[i].style.display = 'none';
            };

            let instructionsElements = $$('.instructions');
            for (let i = 0; i < instructionsElements.length; i++) {
                instructionsElements[i].style.display = 'unset';
            };

            randomBox.left = Math.floor(Math.random() * 150 + 50);
            randomBox.top = Math.floor(Math.random() * 150 + 50);
            randomBox.width = Math.floor(Math.random() * 240 + 200);
            randomBox.height = Math.floor(Math.random() * 180 + 100);

            let sampImg = new Image();
            sampImg.crossOrigin="anonymous";
            sampImg.onload = function() {
                sampCanvas.height = 480;
                sampCanvas.width = 640;

                frameCanvas.height = randomBox.height;
                frameCanvas.width = randomBox.width;

                sampCtx.drawImage(sampImg, 0, 0, 640, 480);
                frameCtx.drawImage(sampImg, -1 * randomBox.left, -1 * randomBox.top, 640, 480);

                let gradient = imgCtx.createLinearGradient(randomBox.left, randomBox.top, randomBox.width, randomBox.height);
                gradient.addColorStop("0", "#00ff00");
                gradient.addColorStop("0.45", "#ffff00");
                gradient.addColorStop("0.67", "#ffff00");
                gradient.addColorStop("1.0", "red");

                sampCtx.strokeStyle = 'white';
                sampCtx.lineWidth = 6;
                sampCtx.strokeRect(randomBox.left - 5, randomBox.top - 5, randomBox.width + 10, randomBox.height + 10);

                // Fill with gradient
                sampCtx.strokeStyle = gradient;
                sampCtx.lineWidth = 2;
                sampCtx.strokeRect(randomBox.left - 5, randomBox.top - 5, randomBox.width + 10, randomBox.height + 10);
            };

            sampImg.src = 'https://loremflickr.com/640/480/' + ['city', 'cats', 'abstract', 'dogs', 'food', 'cars', 'farm'][Math.floor(Math.random() * 7)];
        }


        function compareImages() {
            let diffValue = 0;

            $('#img-frame').style.height = Math.floor(randomBox.height * 0.66) + 'px';
            $('#img-select').style.height = Math.floor(randomBox.height * 0.66) + 'px';
            $('#img-output').style.height = Math.floor(randomBox.height * 0.66) + 'px';

            $('#img-frame').src = frameCanvas.toDataURL();
            $('#div-select').style.display = 'unset';
            $('#div-frame').style.display = 'unset';
            $('#div-output').style.display = 'unset';
            sampCanvas.style.display = 'none';

            let instructionsElements = $$('.instructions');
            for (let i = 0; i < instructionsElements.length; i++) {
                instructionsElements[i].style.display = 'none';
            };

            frameCanvas.toBlob((blob1) => {
                let file1 = new File([blob1], "startImage.png", { type: "image/png" });

                resembleControl = resemble(file1)
                    .compareTo(file)
                    .scaleToSameSize()
                    .ignoreAntialiasing()
                    .outputSettings({
                        errorType: "diffOnly"
                    })
                    .onComplete(data => {
                        console.log(data);

                        $('#diff-value').innerText = (100 - data.rawMisMatchPercentage).toFixed(1);
                        $('.results').style.display = 'unset';

                        if (data.rawMisMatchPercentage <= 5) {
                            $('#feedback-great').style.display = 'unset';
                            $('#stars').innerHTML = '\u2605 \u2605 \u2605 \u2605';
                        } else if (data.rawMisMatchPercentage <= 10) {
                            $('#feedback-good').style.display = 'unset';
                            $('#stars').innerHTML = '\u2605 \u2605 \u2605 \u2606';
                        } else if (data.rawMisMatchPercentage <= 15) {
                            $('#feedback-okay').style.display = 'unset';
                            $('#stars').innerHTML = '\u2605 \u2605 \u2606 \u2606';
                        } else {
                            $('#feedback-poor').style.display = 'unset';
                            $('#stars').innerHTML = '\u2605 \u2606 \u2606 \u2606';
                        }

                        $('#img-output').src = data.getImageDataUrl();
                    });

            }, 'image/png');
        };

        setupImages();
    </script>
</body>

</html>