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+<?php
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+function hexToRgb($hex) {
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+ $hex = ltrim($hex, '#');
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+ if (strlen($hex) === 3) {
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+ $r = hexdec(substr($hex, 0, 1) . substr($hex, 0, 1));
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+ $g = hexdec(substr($hex, 1, 1) . substr($hex, 1, 1));
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+ $b = hexdec(substr($hex, 2, 1) . substr($hex, 2, 1));
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+ } else {
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+ $r = hexdec(substr($hex, 0, 2));
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+ $g = hexdec(substr($hex, 2, 2));
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+ $b = hexdec(substr($hex, 4, 2));
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+ }
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+ return array('r' => $r, 'g' => $g, 'b' => $b);
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+}
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+
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+function rgbToHex($r, $g, $b) {
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+ $hex = sprintf("#%02X%02X%02X", $r, $g, $b);
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+ return $hex;
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+}
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+
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+function getComplementHex($hex) {
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+ $rgb = hexToRgb($hex);
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+ $compR = 255 - $rgb['r'];
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+ $compG = 255 - $rgb['g'];
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+ $compB = 255 - $rgb['b'];
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+ return rgbToHex($compR, $compG, $compB);
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+}
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+
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+$original_hex = "#000000";
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+$complement_hex = "#FFFFFF";
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+
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+if (isset($_POST['calculate'])) {
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+ if (!empty($_POST['hex_color']) && preg_match('/^#([0-9A-F]{3}|[0-9A-F]{6})$/i', $_POST['hex_color'])) {
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+ $original_hex = strtoupper($_POST['hex_color']);
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+ $complement_hex = getComplementHex($original_hex);
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+ } else if (isset($_POST['r'], $_POST['g'], $_POST['b'])) {
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+ $r = max(0, min(255, intval($_POST['r'])));
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+ $g = max(0, min(255, intval($_POST['g'])));
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+ $b = max(0, min(255, intval($_POST['b'])));
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+ $original_hex = rgbToHex($r, $g, $b);
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+ $complement_hex = getComplementHex($original_hex);
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+ }
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+}
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+?>
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+
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+<!DOCTYPE html>
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+<html lang="de">
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+<head>
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+<meta charset="UTF-8">
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+<title>Komplementärfarbe berechnen</title>
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+<style>
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+body {
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+ font-family: Arial, sans-serif;
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+ margin: 20px;
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+}
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+.color-box {
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+ width: 100px;
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+ height: 100px;
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+ display: inline-block;
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+ margin: 10px;
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+ border: 1px solid #000;
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+}
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+.input-group {
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+ margin-bottom: 20px;
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+}
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+.result {
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+ margin-top: 30px;
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+ padding: 20px;
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+ border: 1px solid #ddd;
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+ border-radius: 5px;
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+}
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+</style>
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+</head>
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+<body>
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+<h1>Komplementärfarbe berechnen</h1>
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+
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+<form method="post">
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+<div class="input-group">
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+<label for="hex_color">HEX Farbcode:</label>
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+<input type="text" id="hex_color" name="hex_color" maxlength="7" placeholder="#000000" value="<?= htmlspecialchars($original_hex) ?>" oninput="updateColor()">
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+</div>
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+
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+<div class="input-group">
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+<label>RGB Schieberegler:</label>
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+<div>
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+<label for="r">Rot: <span id="red-value"><?= hexdec(substr($original_hex, 1, 2)) ?></span></label>
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+<input type="range" id="r" name="r" min="0" max="255" value="<?= hexdec(substr($original_hex, 1, 2)) ?>" oninput="updateFromSliders()">
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+</div>
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+<div>
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+<label for="g">Grün: <span id="green-value"><?= hexdec(substr($original_hex, 3, 2)) ?></span></label>
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+<input type="range" id="g" name="g" min="0" max="255" value="<?= hexdec(substr($original_hex, 3, 2)) ?>" oninput="updateFromSliders()">
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+</div>
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+<div>
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+<label for="b">Blau: <span id="blue-value"><?= hexdec(substr($original_hex, 5, 2)) ?></span></label>
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+<input type="range" id="b" name="b" min="0" max="255" value="<?= hexdec(substr($original_hex, 5, 2)) ?>" oninput="updateFromSliders()">
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+</div>
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+</div>
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+
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+<div class="input-group">
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+<label for="color_picker">Farbwähler:</label>
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+<input type="color" id="color_picker" name="color_picker" value="<?= $original_hex ?>" oninput="updateColorPicker()">
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+</div>
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+
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+<div class="input-group">
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+<button type="submit" name="calculate">Berechnen</button>
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+</div>
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+</form>
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+
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+<div class="result">
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+<h3>Originalfarbe:</h3>
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+<div class="color-box" style="background-color: <?= $original_hex; ?>;"></div>
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+<p>HEX: <?= htmlspecialchars($original_hex); ?></p>
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+
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+<h3>Komplementärfarbe:</h3>
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+<div class="color-box" style="background-color: <?= $complement_hex; ?>;"></div>
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+<p>HEX: <?= htmlspecialchars($complement_hex); ?></p>
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+</div>
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+
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+<script>
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+function updateColor() {
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+ const hexInput = document.getElementById('hex_color').value;
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+ if (/^#([0-9A-F]{3}|[0-9A-F]{6})$/i.test(hexInput)) {
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+ const r = parseInt(hexInput.substr(1, 2), 16);
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+ const g = parseInt(hexInput.substr(3, 2), 16);
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+ const b = parseInt(hexInput.substr(5, 2), 16);
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+
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+ document.getElementById('r').value = r;
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+ document.getElementById('g').value = g;
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+ document.getElementById('b').value = b;
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+ document.getElementById('red-value').textContent = r;
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+ document.getElementById('green-value').textContent = g;
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+ document.getElementById('blue-value').textContent = b;
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+ document.getElementById('color_picker').value = hexInput.toLowerCase();
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+ }
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+}
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+
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+function updateFromSliders() {
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+ const r = document.getElementById('r').value;
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+ const g = document.getElementById('g').value;
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+ const b = document.getElementById('b').value;
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+
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+ let hex = "#" + ((1 << 24) + (r << 16) + (g << 8) + b).toString(16).slice(1);
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+ if (hex.length === 4) {
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+ hex = "#" + [hex[1], hex[1], hex[2], hex[2], hex[3], hex[3]].join("");
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+ }
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+
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+ document.getElementById('hex_color').value = hex.toUpperCase();
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+ document.getElementById('color_picker').value = hex.toLowerCase();
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+ document.getElementById('red-value').textContent = r;
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+ document.getElementById('green-value').textContent = g;
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+ document.getElementById('blue-value').textContent = b;
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+}
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+
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+function updateColorPicker() {
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+ const color = document.getElementById('color_picker').value;
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+ const r = Math.round(parseInt(color.substr(1, 2), 16));
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+ const g = Math.round(parseInt(color.substr(3, 2), 16));
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+ const b = Math.round(parseInt(color.substr(5, 2), 16));
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+
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+ document.getElementById('hex_color').value = color.toUpperCase();
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+ document.getElementById('r').value = r;
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+ document.getElementById('g').value = g;
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+ document.getElementById('b').value = b;
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+ document.getElementById('red-value').textContent = r;
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+ document.getElementById('green-value').textContent = g;
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+ document.getElementById('blue-value').textContent = b;
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+}
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+</script>
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+</body>
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+</html>
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