Reactive Dot Grid - Canvas

Developer
Kyle Brumm
Size
3,287 Kb
Views
4,048
  1. Reactive Dot Grid - Canvas Previews
  2. Reactive Dot Grid - Canvas HTML Codes
  3. Reactive Dot Grid - Canvas CSS Codes
  4. Reactive Dot Grid - Canvas JS Codes

How do I make an reactive dot grid - canvas?

Just some more canvas tomfoolery.. What is a reactive dot grid - canvas? How do you make a reactive dot grid - canvas? This script and codes were developed by Kyle Brumm on 07 January 2023, Saturday.

Reactive Dot Grid - Canvas Previews
IQ Test

Reactive Dot Grid - Canvas - Script Codes HTML Codes

<!DOCTYPE html>
<html >
<head> <meta charset="UTF-8"> <title>Reactive Dot Grid - Canvas</title> <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/normalize/5.0.0/normalize.min.css"> <link rel="stylesheet" href="css/style.css">
</head>
<body> <canvas id="canvas"></canvas> <script src="js/index.js"></script>
</body>
</html>

Reactive Dot Grid - Canvas - Script Codes CSS Codes

body { overflow: hidden; cursor: none;
}

Reactive Dot Grid - Canvas - Script Codes JS Codes

// Canvas
const c = document.getElementById('canvas');
const ctx = c.getContext('2d');
// Variables
let [cw, ch] = [window.innerWidth, window.innerHeight];
let [lastX, lastY] = [null, null];
let dots = [];
let resizeTimer;
// Settings
let [DOT_SMALL, DOT_LARGE] = [1, 20];
const HOVER_RADIUS = 60;
const DOT_DECAY = 0.15;
let [NUM_ROWS, NUM_COLS] = [Math.ceil(ch/DOT_LARGE), Math.ceil(cw/DOT_LARGE)];
let NUM_DOTS = NUM_ROWS*NUM_COLS;
// requestAnimationFrame fallback
window.requestAnimFrame = (function() { return window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.msRequestAnimationFrame || function( callback ){ window.setTimeout(callback, 1000 / 60); };
})();
//--------------------------------------------------------------------
// Create a new dot
function Dot(radius, x, y, hue) {
    this.radius = radius;
    this.x = x;
    this.y = y;
    this.hue = hue; this.inHoverRadius = false;
}
// Update a dot
Dot.prototype.update = function() { // Draw the dot
    ctx.beginPath();
    ctx.arc( this.x, this.y, this.radius, 0, Math.PI * 2, false );
    ctx.closePath();
  // Style it up
    ctx.fillStyle = `hsla(${this.hue}, 100%, 50%, 1)`;
    ctx.fill(); // Check the mouses proximity this.checkProximity(); // Decay the radius this.decayRadius();
};
// Check the dots proximity
Dot.prototype.checkProximity = function() { let dist = DOT_SMALL; // Check if the mouse is on the canvas if (lastX && lastY) { // Get proximity let dX = this.x - lastX; let dY = this.y - lastY; dist = Math.sqrt(Math.pow(dX, 2) + Math.pow(dY, 2)); // Update dot radius if (dist >= HOVER_RADIUS) { this.radius = this.radius; this.inHoverRadius = false; } else { // this.radius = DOT_SMALL/2 + ((DOT_LARGE*2) - (DOT_LARGE*(dist/100))); // this.radius = DOT_SMALL/2 + (DOT_LARGE*((HOVER_RADIUS-dist)/10)); // this.radius = DOT_SMALL/2 + (DOT_LARGE - (DOT_LARGE*dist/HOVER_RADIUS)); this.radius = DOT_SMALL/2 + (DOT_LARGE*2 - (DOT_LARGE*dist/HOVER_RADIUS)); this.inHoverRadius = true; } } else { this.inHoverRadius = false; }
}
// Check the dots radius decay
Dot.prototype.decayRadius = function() { if (!this.inHoverRadius && this.radius > DOT_SMALL) { this.radius = this.radius - DOT_DECAY; }
}
// Add a new dot
function addDot(radius, x, y, hue) { radius = radius || DOT_SMALL/2; x = x; y = y;
    hue = hue || Math.floor(Math.random() * (360 - 1 + 1)) + 1; // Create the new dot let dot = new Dot(radius, x, y, hue); // Add the dot to the array dots.push(dot);
}
// Add our initial dots
function init() { dots = []; // Add the dots	for (let row = DOT_LARGE; row <= ch; row += DOT_LARGE*2) {	for (let col = DOT_LARGE; col <= cw; col += DOT_LARGE*2) {     addDot(DOT_SMALL, col, row); } } draw();
}
// Clear the canvas and draw the new frame
function draw() {
    ctx.clearRect(0, 0, cw, ch); // Update the dots for (let i = 0; i < dots.length; i++) {
        dots[i].update();
    } // Add helper text // ctx.fillStyle = 'black'; // ctx.textAlign='center'; // ctx.font = '12px Arial'; // ctx.fillText('Move you mouse around and watch the dots change.', (cw / 2), 15); requestAnimFrame(draw);
}
// Update the size of the canvas
function resizeCanvas() { [cw, ch] = [window.innerWidth, window.innerHeight]; // Update canvas size [c.width, c.height] = [cw, ch]; // Update rows, cols, and number of dots [NUM_ROWS, NUM_COLS] = [Math.ceil(ch/(DOT_LARGE*2))+1, Math.ceil(cw/(DOT_LARGE*2))]; NUM_DOTS = NUM_ROWS*NUM_COLS; clearTimeout(resizeTimer); resizeTimer = setTimeout(function() { init(); }, 250);
}
//--------------------------------------------------------------------
// Set mouse coordinates
c.addEventListener('mousemove', (e) => { [lastX, lastY] = [e.offsetX, e.offsetY];
}, false);
c.addEventListener('mouseout', (e) => { [lastX, lastY] = [null, null];
}, false);
// Click events
c.addEventListener('click', (e) => { // Update the dots for (let i = 0; i < dots.length; i++) {
        dots[i].radius = DOT_LARGE/2;
    }
}, false);
// Window resize
window.addEventListener('resize', resizeCanvas, false);
//--------------------------------------------------------------------
// Initialize the fun
resizeCanvas();
init();
Reactive Dot Grid - Canvas - Script Codes
Reactive Dot Grid - Canvas - Script Codes
Home Page Home
Developer Kyle Brumm
Username kjbrum
Uploaded January 07, 2023
Rating 4
Size 3,287 Kb
Views 4,048
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