50 lines
1.5 KiB
JavaScript
50 lines
1.5 KiB
JavaScript
const canvas = document.getElementById('matrix-canvas');
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const ctx = canvas.getContext('2d');
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canvas.width = window.innerWidth;
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canvas.height = window.innerHeight;
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//const letters = 'ABCDEFGHIJKLMNOPQRSTUVXYZABCDEFGHIJKLMNOPQRSTUVXYZABCDEFGHIJKLMNOPQRSTUVXYZABCDEFGHIJKLMNOPQRSTUVXYZABCDEFGHIJKLMNOPQRSTUVXYZABCDEFGHIJKLMNOPQRSTUVXYZ1234567890';
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const letters = '日ﾊﾐﾋｰｳｼﾅﾓﾆｻﾜﾂｵﾘｱﾎﾃﾏｹﾒｴｶｷﾑﾕﾗｾﾈｽﾀﾇﾍｦｲｸｺｿﾁﾄﾉﾌﾔﾖﾙﾚﾛﾝ012345789ZTHEMATRIX:・."=*+-<>¦｜╌çｸ̄'
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const fontSize = 24;
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const fontColor = '#0F0';
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const backgroundColor = 'rgba(0, 0, 0, 0.05)';
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const milisec = 80;
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let columns = canvas.width / fontSize;
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const drops = [];
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for (let x = 0; x < columns; x++) {
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drops[x] = 1;
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}
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function draw() {
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ctx.fillStyle = backgroundColor;
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ctx.fillRect(0, 0, canvas.width, canvas.height);
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ctx.fillStyle = fontColor;
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ctx.font = fontSize + 'px arial';
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for (let i = 0; i < drops.length; i++) {
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const text = letters.charAt(Math.floor(Math.random() * letters.length));
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ctx.fillText(text, i * fontSize, drops[i] * fontSize);
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if (drops[i] * fontSize > canvas.height && Math.random() > 0.975) {
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drops[i] = 0;
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}
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drops[i]++;
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}
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}
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setInterval(draw, milisec);
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window.addEventListener('resize', () => {
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canvas.width = window.innerWidth;
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canvas.height = window.innerHeight;
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columns = canvas.width / fontSize;
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drops.length = 0;
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for (let x = 0; x < columns; x++) {
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drops[x] = 1;
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}
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});
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