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57 lines
1.6 KiB
57 lines
1.6 KiB
<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta http-equiv="X-UA-Compatible" content="IE=edge">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>vesmir</title>
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<style>
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section{
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height: 100vh;
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}
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#hvezdy{
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color: white;
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}
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</style>
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</head>
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<body>
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<section id="uvod">
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void
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</section>
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<section id="dark">
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dark
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</section>
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<section id="hvezdy">
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hvezdy
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</section>
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<script>
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function handler() {
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let dark = document.querySelector('#dark');
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let dark_rect = dark.getBoundingClientRect();
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console.log(dark_rect.top);
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let value = Math.ceil(255 * (dark_rect.top / dark_rect.height));
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if (value >= 0 && value <= 255) {
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document.body.style.backgroundColor = "rgb(" + value + "," + value + "," + value + ")";
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}
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let hvezdy = document.querySelector("#hvezdy");
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let hvezdy_rect = hvezdy.getBoundingClientRect();
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console.log("hvezdy: " + (hvezdy_rect.height - hvezdy_rect.top));
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if (hvezdy_rect.height - hvezdy_rect.top > 0) {
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let opacity = (hvezdy_rect.top / hvezdy_rect.height);
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if (opacity >= 0 && opacity <= 1){
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console.log("opacity: " + opacity);
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}
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}
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}
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window.addEventListener('load', handler, false);
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window.addEventListener('scroll', handler, false);
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window.addEventListener('resize', handler, false);
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</script>
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</body>
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</html>
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