HTML5 simulated flashlight lighting effect
A very realistic HTML5 simulated flashlight lighting effect. HTML5 SVG realizes the special effect of lighting the flashlight on the ground, and the light follows the movement of the mouse pointer.
<html>
<head>
<meta charset="utf-8">
<title>HTML5模拟手电筒照明效果</title>
<style>
html, body {
height: 100%;
margin: 0;
}
svg {
display: block;
}
</style>
</head>
<body>
<svg width="100%" height="100%"
xmlns="http://www.w3.org/2000/svg"
xmlns:xlink="http://www.w3.org/1999/xlink"
>
<filter id="light">
<!-- blur the source image to make bump map less sharp -->
<feGaussianBlur stdDeviation="3" result="blurred"></feGaussianBlur>
<!-- create bump map based on alpha channel -->
<feColorMatrix in="blurred" type="luminanceToAlpha" result="bumpMap"></feColorMatrix>
<!-- use bump map for lighting filter -->
<feDiffuseLighting in="bumpMap" surfaceScale="3" result="light">
<fePointLight x="225" y="150" z="30"></fePointLight>
</feDiffuseLighting>
<!-- compose the lighting result with source image using multiplication -->
<feComposite in="light" in2="SourceGraphic"
operator="arithmetic"
k1="1" k2="0" k3="0" k4="0">
</feComposite>
</filter>
<pattern id="pattern1"
width="450" height="300"
patternUnits="userSpaceOnUse"
>
<image xlink:href="img/codepen.jpg"
width="450" height="300"
></image>
</pattern>
<rect width="100%" height="100%"
fill="url(#pattern1)" filter="url(#light)"
></rect>
</svg>
<script>
const svgNode = document.querySelector('svg');
const fePointLightNode = svgNode.querySelector('fePointLight');
svgNode.addEventListener('mousemove', handleMove);
svgNode.addEventListener('touchmove', handleMove);
function handleMove(event) {
fePointLightNode.setAttribute('x', event.clientX);
fePointLightNode.setAttribute('y', event.clientY);
}
</script>
<div style="text-align:center;margin:50px 0; font:normal 14px/24px 'MicroSoft YaHei';">
</div>
</body>
</html>
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