Lan Wei-Project-05-Wallpaper

my-sketch.js
>sketch

/* Lan Wei
Section D
lanw@andrew.cmu.edu
Project 05
*/

function setup(){
    createCanvas(600, 600);
    background(0);
}

var gap = 20; //vertical distance between two waves
var dens = 20; //horizontal density of the waves
var waveRev = 4; // control how big the wave is

function draw(){
    //draw ocean
    var i = 0;
    for (var y = -gap; y < height - gap; y += gap){
        noFill();
        stroke(255);
        beginShape();
        i ++; //will be used for color setting
        for (var x = -50; x < width + 50; x += dens){
            y += random(-gap/waveRev , gap/waveRev );//wave
            curveVertex(x, y);
        }
        curveVertex(width, height);
        curveVertex(0, height);
        curveVertex(0, y - gap/waveRev);//just to find a point to close the shape
        var blue = map(y, 0, height, 255, 30);
        var green = map(y, 0, height, 220, 10);
        fill(50, green, blue);
        noStroke();
        endShape();
    }
    noLoop();
    drawFish();
}

//draw fish pattern
function drawFish(){
    var dist = 100; //horizontal distance between fish
    var level = 70; //vertical distance between fish
    i = 0;
    for (var x = dist; x < width; x += dist){
        i ++;
        if (i % 2 == 0){
            for (var y = level; y < height; y += level){
                fish(x, y);
            }
        }
        else{
            for (var y = level * 1/2; y < height; y += level){
                fish(x, y);
            }
        }
    }
}

//how the fish looks like
function fish(x, y){
    var fishW = 30;
    var fishH = 10;
    var tailL = 10;
    fill(240, 230, 140);
    ellipse(x, y, fishW, fishH);//body
    fill(0);
    ellipse(x-10, y, 5, 5);//eye-black part
    fill(255);
    ellipse(x - 9, y, 1.5, 1.5);//eye-white part
    fill(255, 215, 0);
    triangle(x + fishW/2, y, x + fishW/2 + tailL, y + 5, x + fishW/2 + tailL, y - 5);
    //tail
}

My initial idea was to create a scene of different depth of the ocean. I want to make the waves of some randomness and change the color to show depth difference. After I finished the waves, I added some fish to fulfill the project requirement, and surprisingly the effect is very good. What I feel the most helpful through the project is that I get  familiar with ‘helper functions’ and practiced to create shape with irregular curves.