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Open Source Computer Vision Library
https://opencv.org/
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106 lines
3.1 KiB
106 lines
3.1 KiB
7 years ago
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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8">
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<title>Trackbar Example</title>
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<link href="js_example_style.css" rel="stylesheet" type="text/css" />
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</head>
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<body>
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<h2>Trackbar Example</h2>
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<p>
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<canvas> elements named <b>canvasInput1</b>, <b>canvasInput2</b> and <b>canvasOutput</b> have been prepared.<br>
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The code of <textarea> will be executed when <input> element named <b>trackbar</b> value changes.<br>
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You can change the code in the <textarea> to investigate more.
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</p>
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<div>
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<textarea class="code" rows="12" cols="80" id="codeEditor" spellcheck="false">
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</textarea>
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<p class="err" id="errorMessage"></p>
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</div>
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<div>
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<b>trackbar</b>
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<input type="range" id="trackbar" disabled value="50" min="0" max="100" step="1">
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<label id="weightValue" ></label>
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<div class="inputoutput">
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<div>
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<table cellpadding="0" cellspacing="0" width="0" border="0">
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<tr>
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<td>
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<canvas id="canvasInput1"></canvas>
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</td>
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<td>
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<canvas id="canvasInput2"></canvas>
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</td>
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<td></td>
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<td></td>
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</tr>
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<tr>
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<td>
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<p class="caption">canvasInput1</p>
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</td>
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<td>
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<p class="caption">canvasInput2</p>
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</td>
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<td></td>
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<td></td>
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</tr>
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<tr>
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<td>
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<canvas id="canvasOutput"></canvas>
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</td>
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<td></td>
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<td></td>
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<td></td>
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</tr>
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<tr>
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<td>
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<div class="caption">canvasOutput</div>
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</td>
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<td></td>
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<td></td>
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<td></td>
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</tr>
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</table>
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</div>
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</div>
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</div>
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<script src="utils.js" type="text/javascript"></script>
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<script id="codeSnippet" type="text/code-snippet">
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let trackbar = document.getElementById('trackbar');
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let alpha = trackbar.value/trackbar.max;
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let beta = ( 1.0 - alpha );
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let src1 = cv.imread('canvasInput1');
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let src2 = cv.imread('canvasInput2');
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let dst = new cv.Mat();
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cv.addWeighted( src1, alpha, src2, beta, 0.0, dst, -1);
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cv.imshow('canvasOutput', dst);
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dst.delete();
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src1.delete();
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src2.delete();
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</script>
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<script type="text/javascript">
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let utils = new Utils('errorMessage');
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utils.loadCode('codeSnippet', 'codeEditor');
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utils.loadImageToCanvas('apple.jpg', 'canvasInput1');
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utils.loadImageToCanvas('orange.jpg', 'canvasInput2');
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let trackbar = document.getElementById('trackbar');
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trackbar.addEventListener('input', () => {
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utils.executeCode('codeEditor');
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});
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let weightValue = document.getElementById('weightValue');
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weightValue.innerText = trackbar.value;
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trackbar.addEventListener('input', () => {
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weightValue.innerText = trackbar.value;
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});
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utils.loadOpenCv(() => {
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trackbar.removeAttribute('disabled');
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utils.executeCode('codeEditor');
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});
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</script>
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</body>
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</html>
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