Min Jun Kim- Project 10

Look for a while to see all the details!

/*
Min Jun Kim
15104
Project 10
This program draws a highway setting with randomly made objects
*/

var terrainSpeed = 0.0001;
var terrainDetail = 0.0005;
var terrainmapx = [];
var terrainmapy = [];
var dec = 0; //counter for time
var cars = []; //array of cars

function setup() {
	//sets up canvas and initial 3 cars 
    createCanvas(640, 400);
    for (var i = 0; i < 3; i++) {
    	var rx = random(width);
    	cars[i] = makeCar(rx);
    }

    
}
 


function draw() {
    background(0);    
    fill(0); 
    stroke(0);
    
    beginShape(); 
    for (var x = -30; x < width; x++) {
        var t = (x * terrainDetail) + (millis() * terrainSpeed);
        var y = map(noise(t), 0,1, 0, height)+100;
        
        //draws the wavey terrain background 
        vertex(0,height);
        vertex(width/2, height);
        vertex(width, height);
        vertex(x, y); 

        //index the values for access
        terrainmapx[x]=x; 
        terrainmapy[x]= y;

    }
    endShape();
    //specifications of drawing future items
    stroke(100);
    rectMode(CENTER);
    //when the array gets too full erase the old values
    for (i = 0; i < terrainmapx.length; i+=1) {
    	if(terrainmapx.length > 700) {
        	terrainmapx.pop();
        	terrainmapy.pop();
        }
       	
       	//draws the highway
        stroke(50);
        fill(50);
        rect(i, terrainmapy[i]-65,30,110); 
        fill(100);
        stroke(100);
        rect(i, terrainmapy[i],30,20);
        rect(i, terrainmapy[i]-130,20,20);



    }
    //draws the while center line of the highway
    for (i = 0; i < width+55; i += 50) {
    	fill(240);
    	rect(i+20, terrainmapy[i]-60, 30, 7);
    }
    //calls functions for the car
    DisplaynUpdateCars();
    addCarWithSomeRandomProbability();
    
    //draw the car going right that stays on the canvas
    push();
    translate(150, terrainmapy[150]-30);
    rotate(degrees((atan2(terrainmapy[640]-terrainmapy[150]-30,640-150))+360%360))
    fill(250,240,95,80);
    noStroke();
    triangle(15,0,100,40,100,-40);
    fill(0);
    rect(0,0, 60, 30);
    fill(240,0,0);
    rect(0,0, 30, 30);
    pop()
    

    //draws the moon
    fill(250,240,95);
    ellipse(50, terrainmapy[50]-300, 50,50);
    fill(0);
    ellipse(62, terrainmapy[50]-300, 30,30);

    //draws the raindrops
    for (var y = 5; y <= 480; y+=20) {
		for (var x = 5; x <= 640; x += 10) {
			stroke(0,40,50,80);
			line(x,y,x,y+random(0,20));
		}
	}
    
}

function carMove() {
	//updates the speed and location of the car
	if (oldspeed > this.speed) {
		this.speed = this.speed+ 10;
	}
	var oldspeed = this.speed;
	this.x += this.speed;


}

function DisplaynUpdateCars() {
	//calls the display and update function
	for (var i = 0; i < cars.length; i++) {
		cars[i].display();
		cars[i].move();
	}
}

function carsDisplay() {
	//draws the car itself
	noStroke();
	var heighty= terrainmapy[round(this.x)];
	
	push();

	for (i=0; i<10; i++) {
		fill(250,240,95,10);
		triangle(this.x, heighty-85, this.x-this.sizeX, heighty-85-40,this.x-this.sizeX,heighty-85+40);
		fill(this.colory,100,100);
		rect(this.x, heighty-85, this.sizeX, this.sizeX/2);
		push();
		fill(200);
		rect(this.x, heighty-85, this.sizeX/2, this.sizeX/2);
		pop()
	}
	
	pop();
	
}




function addCarWithSomeRandomProbability() {
	//probability of a car increases over time, which guarentees 
	//that there won't be too long of a gap between cars
    dec += 1;
    if (random(0,1) < dec/500) {
        cars.push(makeCar(width));
        dec = 0;
    }
}

function makeCar(birthLocationX) {
	//specifications of the car
	var car = {x: birthLocationX,
		sizeX: random(60,120),
		colory: random(250),
		speed: random(-20,-15),
		move: carMove,
		display: carsDisplay


	}
	return car;
}

I wanted to make a program that draws on uniquely created terrain, so I studied the way of using noise to create new terrain. Then I made it such that the terrain appears to be smooth and wavy. I indexed the values for later use, and made it such that it disappears when reaching a certain limit- This helped improve the speed of the animation and reduced the need for indexing the x value. I then made it such that random cars appear on both sides, but it looked unrealistic (physics wise) so I made one car stay in the same spot. To make things more moody, I changed it to a night-setting with transparent headlights, a moon and the rain. One problem that I had was that sometimes, the car would overlap when initially starting out, and I tried to go around this problem by changing the range of the speed and adding a counter to the probability of making a new car. I really liked how this project turned out and it taught me well about object programming.