image-diff/index.html at main · RoleModel/image-diff · 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>@rolemodel/image-diff Demo</title>
    <style>
      body {
        width: 400px;
        display: flex;
        flex-direction: column;
        gap: 16px;
      }

      canvas {
        border: 1px solid #000000;
        cursor: crosshair;
      }

      .canvas-label {
        font-weight: bold;
        margin-bottom: 8px;
      }

      .canvas-options {
        display: flex;
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;

        margin-bottom: 8px;
      }
    </style>
</head>
<body>
  <div class="canvas-option">
    <label for="drawing-color">Drawing Color:</label>
    <input type="color" id="drawing-color" value="#ff0000">
  </div>

  <div class="canvas-wrapper">
    <div><span class="canvas-label">Original</span></div>
    <canvas id="original"></canvas>
  </div>

  <div class="canvas-wrapper">
    <div>
      <span class="canvas-label">Modified</span>
      <div class="canvas-options">
        <button type="button" id="copy" class="copy-button">Copy from original</button>
      </div>
    </div>
    <canvas id="modified"></canvas>
  </div>

  <div class="canvas-wrapper">
    <div>
      <span class="canvas-label">Result</span>
      <div class="canvas-options">
        <div class="canvas-option">
          <label for="diff-threshold">Diff Threshold:</label>
          <input type="range" id="diff-threshold" min="0" max="1" step="0.01" value="0.2">
        </div>

        <div class="canvas-option">
          <label for="background-alpha">Background Alpha:</label>
          <input type="range" id="background-alpha" min="0" max="1" step="0.01" value="1.0">
        </div>

        <div class="canvas-option">
          <label for="addition-color">Addition Color:</label>
          <input type="color" id="addition-color" value="#ff0000">
        </div>
        <div class="canvas-option">
          <label for="deletion-color">Deletion Color:</label>
          <input type="color" id="deletion-color" value="#0000ff">
        </div>
      </div>
    </div>
    <canvas id="result"></canvas>
  </div>

  <script type="module">
    import ImageDiff from './src/ImageDiff.js'

    const originalCanvas = document.getElementById('original')
    const originalContext = originalCanvas.getContext('2d')
    const modifiedCanvas = document.getElementById('modified')
    const modifiedContext = modifiedCanvas.getContext('2d')
    const resultCanvas = document.getElementById('result')
    const resultContext = resultCanvas.getContext('2d')

    const copyButton = document.getElementById('copy')
    const drawingColorInput = document.getElementById('drawing-color')

    const diffThresholdInput = document.getElementById('diff-threshold')
    const backgroundAlphaInput = document.getElementById('background-alpha')
    const additionColorInput = document.getElementById('addition-color')
    const deletionColorInput = document.getElementById('deletion-color')

    const diff = new ImageDiff(originalCanvas, modifiedCanvas)

    function diffOptions() {
      const additionColor = additionColorInput.value
      const r = parseInt(additionColor.slice(1, 3), 16) / 255
      const g = parseInt(additionColor.slice(3, 5), 16) / 255
      const b = parseInt(additionColor.slice(5, 7), 16) / 255

      const deletionColor = deletionColorInput.value
      const dr = parseInt(deletionColor.slice(1, 3), 16) / 255
      const dg = parseInt(deletionColor.slice(3, 5), 16) / 255
      const db = parseInt(deletionColor.slice(5, 7), 16) / 255

      return {
        additionColor: { r, g, b },
        deletionColor: { r: dr, g: dg, b: db },
        threshold: parseFloat(diffThresholdInput.value),
        backgroundAlpha: parseFloat(backgroundAlphaInput.value)
      }
    }

    function updateDiff() {
      const diffCanvas = diff.update(diffOptions())

      resultContext.clearRect(0, 0, resultCanvas.width, resultCanvas.height)
      resultContext.drawImage(diffCanvas, 0, 0)
    }

    function addCanvasEventListeners(canvasContext) {
      canvasContext.canvas.addEventListener('pointermove', event => {
        if (event.buttons !== 1) return
        const rect = canvasContext.canvas.getBoundingClientRect()
        const x = event.clientX - rect.left
        const y = event.clientY - rect.top
        const ctx = canvasContext
        ctx.fillStyle = drawingColorInput.value
        ctx.fillRect(x - 5, y - 5, 10, 10)
        updateDiff()
      })
    }

    addCanvasEventListeners(originalContext)
    addCanvasEventListeners(modifiedContext)

    copyButton.addEventListener('click', () => {
      modifiedContext.clearRect(0, 0, modifiedCanvas.width, modifiedCanvas.height)
      modifiedContext.drawImage(originalCanvas, 0, 0)
      updateDiff()
    })

    diffThresholdInput.addEventListener('input', updateDiff)
    backgroundAlphaInput.addEventListener('input', updateDiff)
    diffColorInput.addEventListener('input', updateDiff)
  </script>
</body>
</html>