61 lines
1.9 KiB
JavaScript
61 lines
1.9 KiB
JavaScript
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//Matrix canvas
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var c = document.getElementById("c");
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var ctx = c.getContext("2d");
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//Get client offsets
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var my_height = "innerHeight" in window
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? window.innerHeight
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: document.documentElement.offsetHeight; ;
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var my_width = "innerWidth" in window
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? window.innerWidth
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: document.documentElement.offsetWidth; ;
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// making the canvas full screen
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c.height = my_height;
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c.width = my_width;
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//latin characters - taken from the unicode charset
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var matrix = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ123456789@#$%^&*()*&^%+-/~{[|`]}";
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//converting the string into an array of single characters
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matrix = matrix.split("");
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var font_size = 10;
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var columns = c.width / font_size; //number of columns for the rain
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//an array of drops - one per column
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var drops = [];
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//x below is the x coordinate
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//1 = y co-ordinate of the drop(same for every drop initially)
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for (var x = 0; x < columns; x++)
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drops[x] = 1;
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//drawing the characters
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function draw() {
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//Black BG for the canvas
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//translucent BG to show trail
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ctx.fillStyle = "rgba(0, 0, 0, 0.04)";
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ctx.fillRect(0, 0, c.width, c.height);
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ctx.fillStyle = "#5AA509"; // Gitea green
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//ctx.fillStyle = "red";
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ctx.font = font_size + "px arial";
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//looping over drops
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for (var i = 0; i < drops.length; i++) {
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//a random chinese character to print
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var text = matrix[Math.floor(Math.random() * matrix.length)];
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//x = i*font_size, y = value of drops[i]*font_size
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ctx.fillText(text, i * font_size, drops[i] * font_size);
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//sending the drop back to the top randomly after it has crossed the screen
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//adding a randomness to the reset to make the drops scattered on the Y axis
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if (drops[i] * font_size > c.height && Math.random() > 0.975) {
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drops[i] = 0;
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}
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//incrementing Y coordinate
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drops[i]++;
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}
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}
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setInterval(draw, 35);
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