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September 28, 2016 02:06
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Example of choosing a random function in P5
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/* | |
Example of choosing a random function | |
Notice this program re-randomizes the row of shapes every time it's run! | |
*/ | |
function setup() { | |
createCanvas(800, 400); | |
background(50); | |
//draw some shapes to test. These aren't randomized | |
flower(100, 75, 40, color(255, 0, 0, 150)); | |
roundedSquare(150, 75, 40, color(0, 0, 255, 150)); | |
//put the shape functions into an array | |
var shapeFunctions = [flower, roundedSquare]; | |
//shift down a little | |
translate(100, 200); | |
//loop 7 times, picking a new random shape each time | |
//also randomize color! | |
for(var i=0;i<7;i++) { | |
//this line of code is the key to this example: pick a random number between | |
//0 and the length of the array, use this to retrieve one of the items in | |
//the array (a shape drawing function) and save it to the randomShape variable | |
var randomShape = shapeFunctions[int(random(0, shapeFunctions.length))]; | |
//pick a random color with opacity 100 | |
var randomColor = color(random(0, 255), random(0, 255), random(0, 255), 100); | |
//the randomShape variable now refers to a function we can run | |
randomShape(0, 0, 75, randomColor); | |
//move in x between shapes | |
translate(100, 0); | |
} | |
} | |
function draw() { | |
} | |
function flower(x, y, r, color) { | |
noStroke(); | |
fill(color); | |
var petals = 11; | |
for(var p=0;p<petals;p++) { | |
push(); | |
var angle = p*(TWO_PI/petals); | |
translate(x+r/3*cos(angle), y+r/3*sin(angle)); | |
rotate(angle); | |
ellipse(0, 0, 2/3*r, r/3); | |
pop(); | |
} | |
} | |
function roundedSquare(x, y, w, color) { | |
rectMode(CENTER); //draw square from center | |
noStroke(); | |
fill(color); | |
rect(x, y, w, w, w/10); //5th parameter is corner radius | |
rect(x, y, w/1.5, w/1.5, w/10); //5th parameter is corner radius | |
rect(x, y, w/3, w/3, w/10); //5th parameter is corner radius | |
rectMode(CORNER); //set back to default square drawing mode | |
} |
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