1// Written by AI. Options tuned with AI.
2(globalThis as any).canvas_2022 = function(canvas: HTMLCanvasElement) {
3 const isStandalone = canvas.getAttribute("data-standalone") === "true";
4 // Configuration for the grid of rotating squares
5 const config = {
6 gridRotation: 20, // Overall grid rotation in degrees
7 squareSize: 20, // Size of each square
8 spacing: 100, // Distance between square centers
9 moveSpeedX: 0.01, // Horizontal movement speed (pixels per second)
10 moveSpeedY: 0.01, // Vertical movement speed (pixels per second)
11 squareColor: "#00220A", // Color of the squares
12 squareOpacity: 1, // Opacity of the squares
13
14 // Function to determine square rotation based on its coordinates and time
15 // Can be adjusted for different patterns
16 rotationFunction: (x: number, y: number, time: number): number => {
17 // Combination of spatial wave and time-based rotation
18 return Math.sin(x * 0.05) * Math.cos(y * 0.05) * 180;
19 },
20 };
21
22 // Convert grid rotation to radians
23 const gridRotationRad = (config.gridRotation * Math.PI) / 180;
24
25 // Get the canvas context
26 const ctx = canvas.getContext("2d");
27 if (!ctx) {
28 console.error("Could not get canvas context");
29 return () => {};
30 }
31
32 // Make canvas transparent
33 if (isStandalone) {
34 canvas.style.backgroundColor = "#154226";
35 } else {
36 canvas.style.backgroundColor = "transparent";
37 }
38
39 // Animation variables
40 let width = canvas.width;
41 let height = canvas.height;
42 let offsetX = 0;
43 let offsetY = 0;
44 let time = 0;
45 let animationFrameId: number;
46 let lastTime = 0;
47
48 // Update canvas dimensions when resized
49 const updateDimensions = () => {
50 width = canvas.width = canvas.clientWidth;
51 height = canvas.height = canvas.clientHeight;
52 };
53
54 // Calculate the diagonal length of the canvas (to ensure rotation covers corners)
55 const calculateDiagonal = () => {
56 return Math.sqrt(width * width + height * height);
57 };
58
59 // Draw a single square with rotation
60 const drawSquare = (x: number, y: number, size: number, rotation: number) => {
61 ctx.save();
62
63 // Move to the center of the square position, rotate, then draw
64 ctx.translate(x, y);
65 ctx.rotate((rotation * Math.PI) / 180); // Convert rotation degrees to radians
66
67 // Draw square centered at position
68 ctx.fillRect(-size / 2, -size / 2, size, size);
69
70 ctx.restore();
71 };
72
73 // Draw the entire grid of squares
74 const drawGrid = () => {
75 ctx.clearRect(0, 0, width, height);
76
77 // Set drawing properties
78 ctx.fillStyle = config.squareColor;
79 ctx.globalAlpha = config.squareOpacity;
80
81 // Save the current transformation state
82 ctx.save();
83
84 // Move to the center of the canvas, rotate the grid, then move back
85 const centerX = width / 2;
86 const centerY = height / 2;
87 ctx.translate(centerX, centerY);
88 ctx.rotate(gridRotationRad);
89
90 // Calculate how much of the grid to draw based on canvas size
91 const diagonal = calculateDiagonal();
92 const gridSize = Math.ceil(diagonal / config.spacing) + 2;
93
94 // Adjust for offset to create movement
95 const adjustedOffsetX = offsetX % config.spacing;
96 const adjustedOffsetY = offsetY % config.spacing;
97
98 // Draw grid with enough squares to cover the rotated canvas
99 const halfGrid = Math.ceil(gridSize / 2);
100
101 for (let y = -halfGrid; y <= halfGrid; y++) {
102 for (let x = -halfGrid; x <= halfGrid; x++) {
103 // Calculate actual position with offset
104 const posX = x * config.spacing + adjustedOffsetX;
105 const posY = y * config.spacing + adjustedOffsetY;
106
107 // Calculate square rotation based on its position and time
108 const squareRotation = config.rotationFunction(posX, posY, time);
109
110 // Draw the square
111 drawSquare(posX, posY, config.squareSize, squareRotation);
112 }
113 }
114
115 // Restore the transformation state
116 ctx.restore();
117
118 // Reset global alpha
119 ctx.globalAlpha = 1.0;
120 };
121
122 // Animation loop
123 const animate = (currentTime: number) => {
124 animationFrameId = requestAnimationFrame(animate);
125
126 // Calculate time elapsed since last frame
127 const elapsed = currentTime - lastTime;
128 lastTime = currentTime;
129
130 // Update time variable for rotation function
131 time += elapsed;
132
133 // Update position offsets for movement
134 offsetX += config.moveSpeedX * elapsed;
135 offsetY += config.moveSpeedY * elapsed;
136
137 // Draw the grid
138 drawGrid();
139 };
140
141 // Initialize the animation
142 const init = () => {
143 // Set up resize handler
144 window.addEventListener("resize", updateDimensions);
145
146 // Initial setup
147 updateDimensions();
148
149 // Start animation
150 animationFrameId = requestAnimationFrame(animate);
151 };
152
153 // Start the animation
154 init();
155
156 // Return cleanup function
157 return () => {
158 window.removeEventListener("resize", updateDimensions);
159 cancelAnimationFrame(animationFrameId);
160 };
161};