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coral.js
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coral.js
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'use strict';
var DRAW_COUNTER = 0;
var STROKE_COUNTER = 0;
var FRAME_TIME = 0;
var CALC_TIME = 0;
var RENDER_TIME = 0;
var MOVE_TIME = 0;
init();
window.onresize = resizeCanvas;
function init() {
resizeCanvas();
const canvas = document.getElementById('canvas');
canvas.addEventListener('resize', () => {
resizeCanvas();
})
window.requestAnimationFrame(draw);
const measurementTime = 5 * 1000;
setInterval(() => {
console.clear();
setTimeout(() => {
console.group('STATS');
console.log(DRAW_COUNTER + ' draws in ' + measurementTime / 1000 +' sec with ' + STROKE_COUNTER + ' rendered strokes');
console.log('avg. calc-time: \t\t' + ((CALC_TIME / FRAME_TIME) * 100).toFixed(4) + '%');
console.log('avg. render-time: \t' + ((RENDER_TIME / FRAME_TIME) * 100).toFixed(4) + '%');
console.log('avg. move-time: \t' + ((MOVE_TIME / FRAME_TIME) * 100).toFixed(4) + '%');
console.groupEnd();
DRAW_COUNTER = 0;
STROKE_COUNTER = 0;
FRAME_TIME = 0;
CALC_TIME = 0;
RENDER_TIME = 0;
MOVE_TIME = 0;
}, 10);
}, measurementTime);
}
// set the canvas sizes or match screenSize if value < 0
function resizeCanvas() {
const canvas = document.getElementById('canvas');
canvas.setAttribute('height', canvas.clientHeight);
canvas.setAttribute('width', canvas.clientWidth);
canvas.style.backgroundColor = '#000000';
}
function clamp(number, min, max) {
return Math.max(min, Math.min(number, max));
}
function getRandomInt(min, max) {
min = Math.ceil(min);
max = Math.floor(max);
return Math.floor(Math.random() * (max - min + 1)) + min;
}
function randomVector() {
const x = getRandomInt(2, 5) / 100;
const y = getRandomInt(2, 5) / 100;
return {
x: (Math.random() > 0.5 ? -1 : 1) * x * (document.body.clientHeight / 1000),
y: (Math.random() > 0.5 ? -1 : 1) * y * (document.body.clientHeight / 1000)
}
}
// constances for map generation
const zoomScale = (document.body.clientHeight / 100);
const fieldSize = (document.body.clientHeight / 20);
const pointMaxLength = (document.body.clientHeight / 2);
const recursivePoints = 1;
// length noise => length map for rectangles
const lengthNoise = new PerlinNoise(zoomScale);
var lengthOffsetVector = randomVector();
// rotation noise => rotation map for rectangles
const rotationNoise = new PerlinNoise(zoomScale * 2);
var rotationOffsetVector = randomVector();
// red color noise => color map for red fill of rectangles
const rColorNoise = new PerlinNoise(zoomScale);
var rColorOffsetVector = randomVector();
// green color noise => color map for green fill of rectangles
const gColorNoise = new PerlinNoise(zoomScale);
var gColorOffsetVector = randomVector();
// blue color noise => color map for blue fill of rectangles
const bColorNoise = new PerlinNoise(zoomScale);
var bColorOffsetVector = randomVector();
// draw canvas content
function draw() {
const frameTime = Date.now();
const canvas = document.getElementById('canvas');
const ctx = canvas.getContext('2d');
// clear canvas
ctx.clearRect(0, 0, canvas.getAttribute('width'), canvas.getAttribute('height'));
// loop through the positions in the 2D canvas
let strokeCounter = 0;
for (var x = 0; x < canvas.clientWidth / fieldSize / recursivePoints; x++) {
for (var y = 0; y < canvas.clientHeight / fieldSize / recursivePoints; y++) {
const calcTime = Date.now();
const height = pointMaxLength * clamp(lengthNoise.get(x, y), 0, 1);
const rotation = rotationNoise.get(x, y) * (360 * 3 / Math.PI);
const rColor = clamp((256 * 3 * rColorNoise.get(x, y)), 64, 512);
const gColor = clamp((256 * 3 * gColorNoise.get(x, y)), 64, 512);
const bColor = clamp((256 * 3 * bColorNoise.get(x, y)), 64, 512);
CALC_TIME += Date.now() - calcTime;
const renderTime = Date.now();
for (var ix = 0; ix < recursivePoints; ix++) {
for (var iy = 0; iy < recursivePoints; iy++) {
strokeCounter += 1;
roundRect(ctx, ((x * recursivePoints) * fieldSize) + (ix * fieldSize), ((y * recursivePoints) * fieldSize) + (iy * fieldSize), (fieldSize / 2), height, fieldSize / (2 * 2), rotation,
true, `rgba(${rColor}, ${gColor} ,${bColor})`,
false, '#22aaff', 1);
}
}
RENDER_TIME += Date.now() - renderTime;
}
}
STROKE_COUNTER = strokeCounter;
const moveTime = Date.now();
lengthNoise.move(lengthOffsetVector);
rotationNoise.move(rotationOffsetVector);
rColorNoise.move(rColorOffsetVector);
gColorNoise.move(gColorOffsetVector);
bColorNoise.move(bColorOffsetVector);
MOVE_TIME += Date.now() - moveTime;
FRAME_TIME += Date.now() - frameTime;
DRAW_COUNTER ++;
window.requestAnimationFrame(draw);
}
/** draws a rounded rectangle into the canvas-context
* @param {CanvasRenderingContext2D} ctx
* @param {Number} x
* @param {Number} y
* @param {Number} width
* @param {Number} height
* @param {Number} radius
* @param {Boolean} fill
* @param {String} fillColor
* @param {Boolean} stroke
* @param {String} strokeColor
* @param {Number} strokeWidth
*/
function roundRect(ctx, x, y, width, height, radius = 0, rotation = 0,
fill = true, fillColor = '#dededf',
stroke = true, strokeColor = '#ffffff', strokeWidth = 2) {
if (height < radius * 2 || width < radius * 2) { return; }
ctx.save();
ctx.beginPath();
ctx.translate(x + width/2, y + height/2);
ctx.rotate(rotation * Math.PI / 180);
ctx.strokeStyle = strokeColor;
ctx.lineWidth = strokeWidth;
ctx.moveTo(radius, 0);
ctx.lineTo(width - radius, 0);
ctx.quadraticCurveTo(width, 0, width, radius);
ctx.lineTo(width, height - radius);
ctx.quadraticCurveTo(width, height, width - radius, height);
ctx.lineTo(radius, height);
ctx.quadraticCurveTo(0, height, 0, height - radius);
ctx.lineTo(0, radius);
ctx.quadraticCurveTo(0, 0, radius, 0);
ctx.closePath();
if (fill) {
// gradient
var g = ctx.createLinearGradient(0, 0, 1, height);
g.addColorStop(0, '#00000000');
g.addColorStop(1, fillColor);
ctx.fillStyle = g;
ctx.fill();
}
if (stroke) { ctx.stroke(); }
ctx.restore();
}