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Pulsing Equations
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| height: 500 |
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| <script async src=http://CDN.JSDelivr.net/npm/p5></script> | |
| <script defer src=http://CDN.JSDelivr.net/gh/dataarts/dat.gui/build/dat.gui.min.js></script> | |
| <script defer src=sketch.js></script> |
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| /** | |
| * Pulsing Equations (v3.0.2) | |
| * by _vk (2014/Sep) | |
| * mod GoToLoop (2017/Sep/21) | |
| * | |
| * Forum.Processing.org/two/discussion/7147/ | |
| * some-simple-pulse-equations-using-trig-#Item_10 | |
| * | |
| * Forum.Processing.org/two/discussion/23468/loading-external-pde#Item_20 | |
| * | |
| * Bl.ocks.org/GoSubRoutine/f9a0a94dcfee23a037b35f308b256d98 | |
| */ | |
| "use strict"; | |
| const EQUATIONS = Object.freeze([ | |
| "sin(t)", | |
| "cos(t)", | |
| "cos(t)*sin(t)", | |
| "sin(t)*sin(t*1.5)", | |
| "sin(tan(cos(t)*1.2))", | |
| "sin(tan(t)*.05)", | |
| "cos(sin(t*3.0))*sin(t*.2)", | |
| "sin(pow(8.0, sin(t)))", | |
| "sin(exp(cos(t*.8))*2.0)", | |
| "sin(t - PI*tan(t)*.01)", | |
| "pow(sin(t*PI), 12.0)", | |
| "cos(sin(t)*tan(t*PI)*PI/8.0)", | |
| "sin(tan(t)*pow(sin(t), 10.0))", | |
| "cos(sin(t*3.0) + t*3.0)", | |
| "pow(abs(sin(t*2.0))*.6, sin(t*2.0)) * .6" | |
| ]); | |
| const TXT = 'Press any button for next equation', | |
| FNT = 'DejaVu Sans', | |
| FPS = 60, OFFSET = 20, OPACITY = 50, | |
| vals = { size: 200, step: .5, spd: .15, amp: 5 }; | |
| let idx = 0, equation = EQUATIONS[idx], x = 0, txtW; | |
| function setup() { | |
| createCanvas(500, 500).mouseClicked(keyTyped); | |
| colorMode(RGB).blendMode(BLEND); | |
| rectMode(CORNERS).ellipseMode(CENTER).angleMode(RADIANS); | |
| strokeCap(ROUND).frameRate(FPS).background(0); | |
| textFont(FNT).textAlign(LEFT).textSize(15); | |
| txtW = OFFSET + textWidth(TXT); | |
| createGUI(); | |
| } | |
| function draw() { | |
| fill(0, OPACITY).noStroke(); | |
| rect(0, 0, width, height - 150); | |
| fill(0).rect(0, height - 50, width, height); | |
| fill(220).ellipse(35, height - 37, 20); | |
| fill(0).textSize(14); | |
| text(nf(idx+1, 2), 26, height - 32); | |
| fill(150).textSize(15); | |
| text(TXT, width - txtW, height - 12); | |
| fill(200).textSize(20); | |
| text(equation, 54, height - 32); | |
| const diam = evalEquation(equation, millis()*vals.spd, vals.size); | |
| fill(0xff).ellipse(width>>1, (height>>1) - 100, diam); | |
| stroke(0xd0, 0, 0).point(x, height - 100 + diam/vals.amp); | |
| stroke(80, 0, 0).line(0, height - 100, width, height - 100); | |
| if ((x += vals.step) > width || x < 0) { | |
| x = x > width? 0 : width | |
| fill(0).noStroke(); | |
| rect(0, height - 150, width, height); | |
| } | |
| } | |
| function keyTyped() { | |
| fill(x = 0).noStroke(); | |
| rect(0, height - 250, width, height); | |
| equation = EQUATIONS[idx = (idx+1) % EQUATIONS.length]; | |
| } | |
| function evalEquation(expression, theta, mult) { | |
| const t = theta * DEG_TO_RAD; | |
| return mult * eval(expression); | |
| } | |
| function createGUI() { | |
| const gui = new dat.GUI; | |
| gui.add(vals, 'size', height>>2, height>>1, 1); // 200 | |
| gui.add(vals, 'step', -3, 3, .01); // .5 | |
| gui.add(vals, 'spd', -2, 2, .01); // .15 | |
| gui.add(vals, 'amp', -20, 20, .1); // 5 | |
| } |
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