Project-11

//Diana McLaughlin, dmclaugh@andrew.cmu.edu, Section A
//A generative landscape that shows trees, clouds, and mountains on a fall day

var trees = [];
var clouds = [];
var mountain = [];
var noiseParam = 0;
var noiseStep = 0.04;

function setup() {
    createCanvas(480, 380);
    
    //set up mountains
    for (var i = 0; i <= 96; i++) {
        var n = noise(noiseParam);
        var value = map(n, 0, 1, 0, height);
        mountain.push(value);
        noiseParam += noiseStep;
    }  
    
    //draw initial trees
    for (var i = 0; i < 10; i++){
        var rx = random(width);
        trees[i] = makeTree(rx);
    }
    
    //draw initial clouds
    for (var i = 0; i < 10; i++){
        var cx = random(width);
        clouds[i] = makeCloud(cx);
    }
    frameRate(10);
}


function draw() {
    background(0, 200, 255); //sky blue

    updateAndDisplayClouds();
    removeCloudsThatHaveSlippedOutOfView();
    addNewCloudsWithSomeRandomProbability();

    mountains();
    fill(0, 120, 0);
    rect(0, 335, width, 65);

    updateAndDisplayTrees();
    removeTreesThatHaveSlippedOutOfView();
    addNewTreesWithSomeRandomProbability();   
}


function updateAndDisplayTrees(){
    // Update the trees' positions
    for (var i = 0; i < trees.length; i++){
        trees[i].move();
        trees[i].display();
    }
}


function removeTreesThatHaveSlippedOutOfView(){
    //remove these trees from the array
    var treesToKeep = [];
    for (var i = 0; i < trees.length; i++){
        if (trees[i].x + trees[i].breadth > 0) {
            treesToKeep.push(trees[i]);
        }
    }
    trees = treesToKeep;
}


function addNewTreesWithSomeRandomProbability() {
    // Add a new tree to the end of the array
    var newTreeLikelihood = 0.05; 
    if (random(0,1) < newTreeLikelihood) {
        trees.push(makeTree(width));
    }
}

function treeMove() {
    this.x += this.speed;
}
    
function treeDisplay() {
    //draw the tree
    var tHeight = 70; 
    fill(this.clr); 
    stroke(0); 
    push();
    translate(this.x, height - 40);
    triangle(0, -tHeight, -this.breadth/2, tHeight-90, this.breadth/2, tHeight-90);
    fill(255, 255, 150);
    rect(-5, tHeight-90, 10, 20);
    stroke(200); 
    pop();
}


function makeTree(birthLocationX) {
    var tr = {x: birthLocationX,
                clr: color(random(0, 255), random(0, 255), 0),
                breadth: 50,
                speed: -6.0,
                move: treeMove,
                display: treeDisplay}
    return tr;
}

//Clouds

function updateAndDisplayClouds(){
    // Update the clouds' positions
    for (var i = 0; i < clouds.length; i++){
        clouds[i].move();
        clouds[i].display();
    }
}


function removeCloudsThatHaveSlippedOutOfView(){
    // remove clouds that are no longer visible
    var cloudsToKeep = [];
    for (var i = 0; i < clouds.length; i++){
        if (clouds[i].x + clouds[i].breadth > 0) {
            cloudsToKeep.push(clouds[i]);
        }
    }
    clouds = cloudsToKeep;
}


function addNewCloudsWithSomeRandomProbability() {
    // Add clouds to the end of the arrayS
    var newCloudLikelihood = 0.02; 
    if (random(0,1) < newCloudLikelihood) {
        clouds.push(makeCloud(width));
    }
}

function cloudMove() {
    this.x += this.speed;
}
    

// draw the clouds
function cloudDisplay() {
    var cHeight = 250; 
    fill(255); 
    noStroke(); 
    push();
    translate(this.x, height - 40);
    ellipse(0, -cHeight, 30, 30);
    ellipse(15, -cHeight, 15, 15);
    ellipse(5, -cHeight+10, 50, 20);
    pop();
}


function makeCloud(birthLocationX) {
    var cld = {x: birthLocationX,
                breadth: 50,
                speed: -2.5,
                move: cloudMove,
                display: cloudDisplay}
    return cld;
}


function mountains() {
    //use random noise to draw mountains
    mountain.shift();
    var n = noise(noiseParam);
    var value = map(n, 0, 1, 0, height);
    mountain.push(value);
    noiseParam += noiseStep;
    
    
    fill(0, 150, 0); //land green
    beginShape(); //shape the terrain
    vertex(0, height);
    for (var i = 0; i <= 96; i++) {
        vertex(i*5, mountain[i]);
    }
    vertex(width, height);
    endShape(); 
}