Created
March 16, 2016 11:05
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Stars dance
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function setup() { | |
// uncomment this line to make the canvas the full size of the window | |
createCanvas(windowWidth, windowHeight); | |
} | |
function draw() { | |
background(8); | |
var imax = 50; | |
for(var i = 0; i<imax; i++) { | |
// Pour modifier le référentiel et revenir ensuite à un référentiel d'origine | |
push(); | |
// Choix de la couleur | |
// J'utilise sinus décalé trois fois pour avoir tout l'arc-en-ciel | |
fill(sin((frameCount/10+i)/10)*255, | |
sin((frameCount/10+i)/10 + 2*PI/3)*255, | |
sin((frameCount/10+i)/10 + 4*PI/3)*255); | |
// Pas de contour | |
noStroke(); | |
// On se déplace au centre | |
translate(width/2, height/2); | |
// On tourne autour du centre | |
rotate(frameCount/100 + i*2*PI/5); | |
// On se déplace dans cette nouvelle direction | |
translate(120, 0); | |
// On tourne autour du nouveau point excentré | |
rotate(frameCount/100 + i*2*PI/100); | |
// | |
translate(150, 0); | |
rotate(frameCount/50 + i*2*PI/200); | |
star(0, 0, sin((frameCount/10+i)/10)*10 + 12, sin((frameCount/10+i)/10)*5 + 7, 5); | |
pop(); | |
} | |
} | |
function star(x, y, radius1, radius2, npoints) { | |
var angle = TWO_PI / npoints; | |
var halfAngle = angle/2.0; | |
beginShape(); | |
for (var a = 0; a < TWO_PI; a += angle) { | |
var sx = x + cos(a) * radius2; | |
var sy = y + sin(a) * radius2; | |
vertex(sx, sy); | |
sx = x + cos(a+halfAngle) * radius1; | |
sy = y + sin(a+halfAngle) * radius1; | |
vertex(sx, sy); | |
} | |
endShape(CLOSE); | |
} |
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<script src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/0.4.17/p5.min.js"></script> |
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body { | |
padding: 0; | |
margin: 0; | |
} |
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