48 lines
1.6 KiB
JavaScript
48 lines
1.6 KiB
JavaScript
const canvas = document.getElementById("Matrix")
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const context = canvas.getContext("2d")
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canvas.height = window.innerHeight + 100;
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canvas.width = window.innerWidth + 5;
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const chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789./*-+#$%^@!~?><:;[]{}\」=_αβΓγΔδεζηΘθικΛλμΞξΠπρΣσςτυΦφχΨψΩω×≦≧≠∞≒≡～∩∠∪∟⊿∫∮∵∴＄￥〒￠￡℃€℉╩◢ⅩⅨⅧⅦⅥⅤⅣⅢⅡⅠあいうえおがぎぐげござじずぜぞだぢつでづどにぬのばひぴぶへぺぼみゃょァゐゎè";
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const fontSize = 16;
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const columns = canvas.width / fontSize;
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const charArr = [];
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for(let i = 0; i < columns; ++i) {
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charArr[i] = 1;
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}
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let frame = 0;
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let str;
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context.fillStyle = "rgba(0, 0, 0, 1)";
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context.fillRect(0, 0, canvas.width, canvas.height);
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function Update() {
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context.fillStyle = "rgba(0, 0, 0, 0.05)";
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context.fillRect(0, 0, canvas.width, canvas.height);
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if(frame == 0){
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let a = parseInt(Math.random() * 255);
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str = `rgba(${a}, ${Math.abs(a - 127)}, ${Math.abs(a - 255)}, 0.9)`;
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}
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context.fillStyle = str;
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context.font = fontSize + "px monospace";
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for(let i = 0; i < columns; ++i){
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const text = chars[Math.floor(Math.random() * chars.length)];
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context.fillText(text, i * fontSize, charArr[i] * fontSize);
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if(charArr[i] * fontSize > canvas.height && Math.random() > 0.90){
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charArr[i] = 0;
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}
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charArr[i]++;
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}
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frame++;
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if(frame <= 40 * (Math.floor(Math.random() * 10) + 3)) requestAnimationFrame(Update); // 40 frames a cycle
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else{
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frame = 0;
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Appear();
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}
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}
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