sprites = []

​

const CROW_COUNT = 100,

    MIN_CROW_SIZE = 0.2,

    MAX_CROW_SIZE = 0.75,

    MIN_Y_NOISE_SPEED = 0.0001,

    MAX_Y_NOISE_SPEED = 0.00075,

    MIN_FLAP_NOISE_SPEED = 0.00001,

    MAX_FLAP_NOISE_SPEED = 0.0005,

    FLAP_SPEED_SCALE = 10,

    ROTATION_SCALE = 40,

    SPRITE_SIZE = 32,

    Y_AXIS = 1,

    X_AXIS = 2

​

let GRADIENT_1, GRADIENT_2, GRADIENT_3

​

let backgroundImage

​

function setup() {

    createCanvas(innerWidth, innerHeight)

    angleMode(DEGREES)

    GRADIENT_1 = color(96, 118, 137)

    GRADIENT_2 = color(140, 153, 161)

    GRADIENT_3 = color(178, 111, 82)

    backgroundImage = createGradient()

​

    let i = 7

    while (i--) {

      sprites.push(loadImage(`./crowsprites/sprite_${i}.png`))

    }

    i = CROW_COUNT

    while (i--) { crows.push(new Crow()) }

}

function draw() {

    image(backgroundImage, 0, 0)

    crows.forEach(crow => {

        crow.update()

        crow.draw()

    })

}

​

function randomStart() {

    return createVector(random(-1000, -SPRITE_SIZE), random(height))

}

​

function toDegrees(radians) {

    return radians*(180/PI)

}

​

function createGradient() {

    setGradient(0, 0, width, height*0.5, GRADIENT_1, GRADIENT_2, Y_AXIS)

    setGradient(0, height*0.5, width, height, GRADIENT_2, GRADIENT_3, Y_AXIS)

​

    img = new p5.Image(width, height)

    img.loadPixels()

    loadPixels()

    let i = pixels.length

    while (i--) { img.pixels[i] = pixels[i] }

    img.updatePixels()

​

    return img

}

​

function setGradient(x, y, w, h, c1, c2, axis) {

    noFill()

    if (axis === Y_AXIS) {

        for (let i = y; i <= y + h; i++) {

            stroke(lerpColor(c1, c2, map(i, y, y + h, 0, 1)))

            line(x, i, x + w, i)

        }

    } else if (axis === X_AXIS) {

        for (let i = x; i <= x + w; i++) {

            stroke(lerpColor(c1, c2, map(i, x, x + w, 0, 1)))

            line(i, y, i, y + h)

        }

    }

}

​