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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

            
              html
	head
		script(src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/0.5.11/p5.min.js")
		script(src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/0.5.11/addons/p5.dom.min.js")
		script(src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.js")
		link(rel="stylesheet" type="text/css" href="style.css")
		link(href="https://fonts.googleapis.com/css?family=Roboto" rel="stylesheet")
	body
		script(src="sketch.js")

            
          
!
            
              html, body 
	padding: 0
	margin: 0
	font-family: 'Roboto', sans-serif
body
	background-color: #263238
div
	color: #ffffff

            
          
!
            
              // The top and bottom waves on the screen are always perlin noise waves (The alpha and omega wave in the code). As you go up the screen from the bottom - alpha - wave each wave gets closer and closer to the top - omega - wave. They are interpolations of the generations between the alpha and omega wave -- and as such are kind of like an evolution. This program is an attempt to digitally recreate a motif I use in many of my drawings, such as this one: https://drive.google.com/open?id=0B8wt4wA78whIV3JRZV9KTDRhX1U

// t, x, y and n are defined as in here: https://www.khanacademy.org/computing/computer-programming/programming-natural-simulations/programming-noise/a/perlin-noise
// slice is the space alloted for each wave.

// Have fun playing around!

// options for user to modify.
var options = {
	width: 1080,
	height: 600,
	tIncrement: 1,
	xIncrement: 0.05,
	yIncrement: 0.01,
	sliceIncrement: 200,
	alphaOmegaDifference: 1000000,
	frameRate: 60,
	bgColor: "#37474f",
	strokeColor: "#ffffff",
	strokeWeight: 1
};

//options that adjust the interface -- user doesn't modify
var config = {
	inputPadding: 40,
	sliderGap: 50,
	tUpper: 10,
	tLower: .1,
	xLower: .001,
	xUpper: .2,
	yLower: .00,
	yUpper: .2,
	sliceLower: 10,
	sliceUpper: 800,
	strokeLower: .25,
	strokeUpper: 32,
	frameLower: 0,
	frameUpper: 240
};


var tSlider, xSlider, ySlider, sliceSlider;
var tText, xText, yText, sliceText;
var y = 0.0;

function setup() {
	createCanvas(options.width, options.height);
	frameRate(options.frameRate);
	textSize(15);

	tSlider = createSlider(config.tLower*1000, config.tUpper*1000, options.tIncrement*1000);
	tSlider.position(config.inputPadding, options.height + config.inputPadding + (config.sliderGap*0));

	xSlider = createSlider(config.xLower*1000, config.xUpper*1000, options.xIncrement*1000);
	xSlider.position(config.inputPadding, options.height + config.inputPadding + (config.sliderGap*1));

	ySlider = createSlider(config.yLower*1000, config.yUpper*1000, options.yIncrement*1000);
	ySlider.position(config.inputPadding, options.height + config.inputPadding + (config.sliderGap*2));

	sliceSlider = createSlider(config.sliceLower, config.sliceUpper, options.sliceIncrement);
	sliceSlider.position(config.inputPadding, options.height + config.inputPadding + (config.sliderGap*3));
	
	strokeSlider = createSlider(config.strokeLower, config.strokeUpper, options.strokeWeight);
	strokeSlider.position(config.inputPadding, options.height + config.inputPadding + (config.sliderGap*4));
	
	frameSlider = createSlider(config.frameLower, config.frameUpper, options.frameRate);
	frameSlider.position(config.inputPadding, options.height + config.inputPadding + (config.sliderGap*5));

	var sliderOffset = config.inputPadding + 131 + config.inputPadding;

	tText = createDiv("t increment (min: " + config.tLower + ", max: " + config.tUpper + ")");
	tText.position(sliderOffset, options.height + config.inputPadding + (config.sliderGap*0));

	xText = createDiv("x increment (min: " + config.xLower + ", max: " + config.xUpper + ")");
	xText.position(sliderOffset, options.height + config.inputPadding + (config.sliderGap*1));

	yText = createDiv("y increment (min: " + config.yLower + ", max: " + config.yUpper + ")");
	yText.position(sliderOffset, options.height + config.inputPadding + (config.sliderGap*2));

	sliceText = createDiv("Slice increment (min: " + config.sliceLower + ", max: " + config.sliceUpper + ")");
	sliceText.position(sliderOffset, options.height + config.inputPadding + (config.sliderGap*3));
	
	strokeText = createDiv("stroke weight (min: " + config.strokeLower + ", max: " + config.strokeUpper + ")");
	strokeText.position(sliderOffset, options.height + config.inputPadding + (config.sliderGap*4));
	
	frameText = createDiv("frame rate (min: " + config.frameLower + ", max: " + config.frameUpper + ")");
	frameText.position(sliderOffset, options.height + config.inputPadding + (config.sliderGap*5));
}

function draw() {
	options = updateOptions();
	var sliceBounds = getSliceBounds();
	background(options.bgColor);
	var alphaWave = getWave();
	var omegaWave = getWave(options.alphaOmegaDifference);
	var differences = subtractWaves(alphaWave, omegaWave);
	var factor = 0;
	_.forEach(sliceBounds, (s, i) => {
		if ( (i-1) > 0) {
			factor = (i / sliceBounds.length);
		}
		var deltaWave = multiplyWave(differences, factor);
		var addedWave = addWaves(alphaWave, deltaWave);
		var wave = mapWave(addedWave, s.lower, s.upper);
		drawWave(wave);
	});
	frameRate(options.frameRate);
}

function getSliceBounds() {
	var sliceBounds = [];
	var lower = 0;
	for (var upper = options.sliceIncrement; upper <= options.height; upper+= options.sliceIncrement) {
		sliceBounds.push({upper, lower});
		lower+= options.sliceIncrement;
	}
	if (lower < options.height && upper > options.height) {
		sliceBounds.push({lower, upper: options.height});
	}
	return sliceBounds;
}

function getWave(yOffset = 0) {
	var x = 0;
	wave = [];
	for (var t = 0; t <= options.width; t+= options.tIncrement) {
		var n = noise(x, y + yOffset);
		wave.push({t, n});
		x += options.xIncrement;
	}
	y += options.yIncrement;
	return wave;
}

function mapWave(wave, lowerBound, upperBound) {
	return _.map(wave, w => {
		var t = w.t;
		var n = map(w.n, 0, 1, lowerBound, upperBound);
		return {t, n};
	});
}

function subtractWaves(wave1, wave2) {
	return  _.map(wave1, (w1, i) => {
		var t = w1.t;
		var n = wave2[i].n - w1.n;
		return {t, n};
	});
}

function addWaves(wave1, wave2) {
	return _.map(wave1, (w1, i) => {
		var t = w1.t;
		var n = wave2[i].n + w1.n;
		return {t, n};
	})
}

function multiplyWave(wave, factor) {
	return _.map(wave, w => {
		t = w.t;
		var n = w.n * factor;
		return {t, n};
	});
}

function drawWave(wave) {
	noFill();
	stroke(options.strokeColor);
	strokeWeight(options.strokeWeight);
	beginShape();
	_.forEach(wave, w => {
		vertex(w.t, w.n);
	});
	endShape();
}

function drawLine(h) {
	line(0,h,options.width,h);
}

function updateOptions() {
	options.tIncrement = tSlider.value() / 1000;
	options.xIncrement = xSlider.value() / 1000;
	options.yIncrement = ySlider.value() / 1000;
	options.sliceIncrement = sliceSlider.value();
	options.strokeWeight = strokeSlider.value();
	options.frameRate = frameSlider.value();
	return options;
}

            
          
!
999px
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