// Bridget Doherty
// bpdohert@andrew.cmu.edu 
// 104 Section C


function setup() {
    createCanvas(480, 480);
    frameRate(5);
    angleMode(DEGREES);
}

function draw() {
    background(0); // black background
    translate(width/2, height/2); // center-based coordinates

    let s = second();
    let m = minute();
    let h = hour();

    drawStars(h);
    drawEarth(s);
    drawSun(h);
    
}

function drawSun(h){
    if (h == 0) { // eclipse every night from 00:00 - 00:59
        fill('black');
        strokeWeight(2);
        stroke('white');
        circle(0, 0, 100);
    } else {
        fill('yellow'); // the sun!
        noStroke();
        circle(0, 0, 100);
    }
}

function drawEarth(s){ // the earth completes a rotation every minute
    noStroke(); // and moves every second
    push();
    rotate(s*6);
    fill('blue');
    circle(150, 0, 70);

    // triangles to approximate land on earth 
    fill('green');
    triangle(170, 0, 120, 0, 150, 20);
    triangle(170, 10, 130, 10, 120, 20);
    triangle(175, -10, 130, -20, 120, 10);

    // ellipse to approximate Antarctica
    fill(220);
    ellipse(150, -30, 30, 10);
    pop();
}

function drawStars(h){ // the amount of stars increases every hour
    for (var i = 0; i<(h*10); i++){ // there are no stars between 00:00 and 00:59
        stroke('white');
        point(random(-width/2,width/2), random(-width/2, width/2));
    }
}