//global variable initialisation
int score;
int xFrog;
int yFrog;
int trainx = 0;
int trainy = 130;

//array for number of cars
Car[] cars = new Car[3];

//setup function
void setup() {
    size(800,750);
    score = 0;
    //position of frog
    xFrog = width/2;
    yFrog = height-20;
    //car creation
    smooth();
    for (int i = 0; i < cars.length; i ++ ) {
        cars[i] = new Car(color(193,41,41),0,i,random(-1,5));
    }
}
 //draw function that displays cars and calls functions
void draw () {
    drawBackground();
    wave();
    log();
    train();
    for (int i = 0; i < cars.length; i ++ ) {
        cars[i].move();
        cars[i].display(); // display for the cars
  }
  frog();
}
//function for the creation of the frog
void frog () {
    fill(26, 95, 26);
    ellipse(xFrog, yFrog, 20, 20);
    ellipse(xFrog-5, yFrog-9, 10, 10);
    ellipse(xFrog+5, yFrog-9, 10, 10);
    fill(0);
    ellipse(xFrog-5, yFrog-9, 3, 3);
    ellipse(xFrog+5, yFrog-9, 3, 3);
}
 //this function holds all of the background initialisation
 //a limitation of this method is the toll it takes on the browser over time
void drawBackground () {
    stroke(0);
    background(90, 255, 90);
    //grass
    grassx = 0;
    grassy = 0;
    //road
    strokeWeight(1);
    int roadx = width/28;
    int roady = height * 0.62;
    int liney = (roady) + ((roadx + height/3.7) / 2.5);
    fill(120);
    rect(grassx,roady,width+1,height/3.7);
    fill(255);
    for (i = 0; i < 8; i++){
        rect(roadx,liney,50,15);
        roadx += (width/8);
    }

    //river
    int rivery = roady-(height/5);
    int riverwidth = height/8;
    fill(0,128,255);
    rect(-1,rivery*0.9,801,riverwidth);
    //train
    boardx = width/400;
    boardy = width/7;
    strokeWeight(5);
    line(-1,125,801,125);
    line(-1,185,801,185);
    for (j = 0; j < 60; j++){
        strokeWeight(1);
        fill(204,102,0);
        rect(boardx,boardy,10,80);
        boardx += 16;
    }

}
//an array that stores the positions of the waves
int [] wavesArray = [50,-130,-310,-490,-670,-850];
int wavespeed = 3;
int wavesize = 10;

 //function that spawns the waves and moves them
void wave () {
    stroke(0,200,255);
    strokeWeight(10);
    fill(0, 128, 255);
    for (i = 0; i < wavesArray.length; i++){

        if (wavesArray[i] > width) {
            wavesArray[i] = -5;
        }
        wavesArray[i] += wavespeed;
    }
    wavesize += 5;

    if (wavesize > 90) {
        noFill();
        wavesize = 10;
    }

    for (j=0; j < wavesArray.length; j++) {
        arc(wavesArray[j], 300, wavesize, 100, PI/14, PI/1.5);
    }
}

 //intialising the variables for the logs
int logx = 300;
int logy = height*2.95;

 //function to create the log (Would have rather made it with a class or loop)
void log() {
    noStroke();
    strokeWeight(1);
    fill(150,100,0);
    logx += 2;
    rect(logx,logy,200,30);
    ellipse(logx,logy+15,30,30);
    ellipse(logx+200,logy+15,30,30);
    fill(150,100,0);
    ellipse(logx,logy+15,30,30);
    fill(220);
    ellipse(logx,logy+15,20,20);
    fill(0);
    stroke(1);
    line(logx+10,logy+5,logx+210,logy+5);
    line(logx+15,logy+15,logx+214,logy+15);
    line(logx+10,logy+24,logx+210,logy+24);
    if (logx-100 > width){
        logx = -200;
    }
}
 //class for the movement of the car
class Car {
  color c;            // sets up variables for the cars, positions and speeds, as well as color so that they can be changed in the main area
  float xpos;
  float ypos;
  float xspeed;

  Car(color c_, float xpos_, float ypos_, float xspeed_) {
    c = c_;
    xpos = xpos_;
    ypos = height-(ypos_*140);
    xspeed = xspeed_;
  }

  void display() {
    noStroke();
    //fill(c);
    //rect(xpos,ypos,60,40);
     fill(111, 169, 219);
    rect(xpos, ypos, 33, 16);
    fill(255, 0, 0);
    rect(xpos-16, ypos+16, 66, 26);
    fill(0);
    ellipse(xpos, ypos+43, 16, 16);
    ellipse(xpos+33, ypos+43, 16, 16);
  }

  void move() {
    xpos = xpos + xspeed;
    if (xpos > width +10) {
      xpos = -20;
    }
    if (xpos < -25){
      xpos = width +10;
    }
  }
}
//function for creation and movement of the dank engine
void train() {
    //train creation
    fill(255,60,50);
    triangle(trainx+70,trainy-20,trainx+80,trainy+55,trainx+100,trainy+55);
    fill(120,120,240);
    triangle(trainx+60,trainy-30,trainx+70,trainy+20,trainx+90,trainy-30);
    ellipse(trainx+15,trainy+40,30,30);
    ellipse(trainx+65,trainy+40,30,30);
    fill(120,120,240);
    rect(trainx,trainy,80,40);
    fill(255,60,50);
    rect(trainx,trainy-30,35,30);
    fill(255);
    rect(trainx+5,trainy-25,25,20);
    text('Dank Engine',trainx+5,trainy+25)
    //train move
    trainx += 4;
    if (trainx > width) {
        trainx = -50;
    }
//smoke

}

//controlkeys
void keyPressed(){
     if (key == 'w' || key == 'W'){
         yFrog -= 5;
         score += 1;
     }
     else if (key == 's' || key == 'S'){
         yFrog += 5;
         score += 1;
     }
     else if (key == 'a' || key == 'A'){
         xFrog -= 5;
     }
     else if (key == 'd' || key == 'D'){
         xFrog += 5;
     }
}