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canvas.js
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function picassoCanvas(roundNumber, seed, params) {
const {area, offsetParameter, multiplier, fontSizeFactor, maxShadowBlur} = params;
class Prng {
constructor(seed) {
this.currentNumber = seed % offsetParameter;
if (this.currentNumber <= 0) {
this.currentNumber += offsetParameter
}
}
getNext() {
this.currentNumber = multiplier * this.currentNumber % offsetParameter;
return this.currentNumber;
}
}
function adaptRandomNumberToContext(randomNumber, maxBound, floatAllowed) {
randomNumber = (randomNumber - 1) / offsetParameter;
if (floatAllowed) {
return randomNumber * maxBound;
}
return Math.floor(randomNumber * maxBound);
}
function addRandomCanvasGradient(prng, context, area) {
const canvasGradient = context.createRadialGradient(
adaptRandomNumberToContext(prng.getNext(), area.width),
adaptRandomNumberToContext(prng.getNext(), area.height),
adaptRandomNumberToContext(prng.getNext(), area.width),
adaptRandomNumberToContext(prng.getNext(), area.width),
adaptRandomNumberToContext(prng.getNext(), area.height),
adaptRandomNumberToContext(prng.getNext(), area.width)
);
canvasGradient.addColorStop(0, colors[adaptRandomNumberToContext(prng.getNext(), colors.length)]);
canvasGradient.addColorStop(1, colors[adaptRandomNumberToContext(prng.getNext(), colors.length)]);
context.fillStyle = canvasGradient
}
function generateRandomWord(prng, wordLength) {
const minAscii = 65;
const maxAscii = 126;
const wordGenerated = [];
for (let i = 0; i < wordLength; i++) {
const asciiCode = minAscii + (prng.getNext() % (maxAscii - minAscii));
wordGenerated.push(String.fromCharCode(asciiCode));
}
return wordGenerated.join('');
}
if (!window.CanvasRenderingContext2D) {
return 'unknown';
}
const colors = ['#FF6633', '#FFB399', '#FF33FF', '#FFFF99', '#00B3E6',
'#E6B333', '#3366E6', '#999966', '#99FF99', '#B34D4D',
'#80B300', '#809900', '#E6B3B3', '#6680B3', '#66991A',
'#FF99E6', '#CCFF1A', '#FF1A66', '#E6331A', '#33FFCC',
'#66994D', '#B366CC', '#4D8000', '#B33300', '#CC80CC',
'#66664D', '#991AFF', '#E666FF', '#4DB3FF', '#1AB399',
'#E666B3', '#33991A', '#CC9999', '#B3B31A', '#00E680',
'#4D8066', '#809980', '#E6FF80', '#1AFF33', '#999933',
'#FF3380', '#CCCC00', '#66E64D', '#4D80CC', '#9900B3',
'#E64D66', '#4DB380', '#FF4D4D', '#99E6E6', '#6666FF'];
const primitives = [
function arc (prng, context, area) {
context.beginPath();
context.arc(
adaptRandomNumberToContext(prng.getNext(), area.width),
adaptRandomNumberToContext(prng.getNext(), area.height),
adaptRandomNumberToContext(prng.getNext(), Math.min(area.width, area.height)),
adaptRandomNumberToContext(prng.getNext(), 2 * Math.PI, true),
adaptRandomNumberToContext(prng.getNext(), 2 * Math.PI, true)
);
context.stroke()
},
function text (prng, context, area) {
const wordLength = Math.max(1, adaptRandomNumberToContext(prng.getNext(), 5));
const textToStroke = generateRandomWord(prng, wordLength);
context.font = `${area.height / fontSizeFactor}px aafakefontaa`;
context.strokeText(
textToStroke,
adaptRandomNumberToContext(prng.getNext(), area.width),
adaptRandomNumberToContext(prng.getNext(), area.height),
adaptRandomNumberToContext(prng.getNext(), area.width)
)
},
function bezierCurve (prng, context, area) {
context.beginPath();
context.moveTo(
adaptRandomNumberToContext(prng.getNext(), area.width),
adaptRandomNumberToContext(prng.getNext(), area.height)
);
context.bezierCurveTo(
adaptRandomNumberToContext(prng.getNext(), area.width),
adaptRandomNumberToContext(prng.getNext(), area.height),
adaptRandomNumberToContext(prng.getNext(), area.width),
adaptRandomNumberToContext(prng.getNext(), area.height),
adaptRandomNumberToContext(prng.getNext(), area.width),
adaptRandomNumberToContext(prng.getNext(), area.height)
);
context.stroke()
},
function quadraticCurve(prng, context, area) {
context.beginPath();
context.moveTo(
adaptRandomNumberToContext(prng.getNext(), area.width),
adaptRandomNumberToContext(prng.getNext(), area.height)
);
context.quadraticCurveTo(
adaptRandomNumberToContext(prng.getNext(), area.width),
adaptRandomNumberToContext(prng.getNext(), area.height),
adaptRandomNumberToContext(prng.getNext(), area.width),
adaptRandomNumberToContext(prng.getNext(), area.height)
);
context.stroke()
},
function ellipse(prng, context, area) {
context.beginPath();
context.ellipse(
adaptRandomNumberToContext(prng.getNext(), area.width),
adaptRandomNumberToContext(prng.getNext(), area.height),
adaptRandomNumberToContext(prng.getNext(), Math.floor(area.width/2)),
adaptRandomNumberToContext(prng.getNext(), Math.floor(area.height/2)),
adaptRandomNumberToContext(prng.getNext(), 2 * Math.PI, true),
adaptRandomNumberToContext(prng.getNext(), 2 * Math.PI, true),
adaptRandomNumberToContext(prng.getNext(), 2 * Math.PI, true)
);
context.stroke()
}
];
try {
const prng = new Prng(seed);
const canvasElt = document.createElement("canvas");
canvasElt.width = area.width;
canvasElt.height = area.height;
canvasElt.style.display = "none";
const context = canvasElt.getContext("2d");
for (let i = 0; i < roundNumber; i++) {
addRandomCanvasGradient(prng, context, area);
context.shadowBlur = adaptRandomNumberToContext(prng.getNext(), maxShadowBlur);
context.shadowColor = colors[adaptRandomNumberToContext(prng.getNext(), colors.length)];
const randomPrimitive = primitives[adaptRandomNumberToContext(prng.getNext(), primitives.length)];
randomPrimitive(prng, context, area);
context.fill()
}
return canvasElt.toDataURL();
} catch (e) {}
}