Specifying information within loops to populate arrays.

Programming Questions

captpresi..

Specifying information within loops to populate arrays.

in Programming Questions • 1 year ago

Ok, I've modified the code I submitted earlier to use arrays a bit, however I'm struggling with specifying the variables of objects within an array.

For example: I want the cars in this code to appear at y=135, y=235, y=335, and y=445. Furthermore, I want all those which appear at y=135 to have speed=-12; those at y=235 to have speed = 8; those at y=335 to have speed -5; and those at y=445 to have speed 4.

Furthermore, I can't find a resource which tells me how to implement intersecting the "cars" with the player when they are generated by an array like this.

What am I missing?

Car[] cars = new Car[15];

PImage img;
PImage imgCar;
PImage imgSplash1;
PImage imgSplash2;
PImage imgSplash3;
PFont f;

//Declare variables for initial game conditions
int fuel = 0;
int lives = 5;
int score = 0;
int currentLevel = 0;
boolean gameOver = false;

void setup() {
size(800, 600);
frameRate(20);
lives = 5;
f = createFont("Arial", 12, true);

//Load the background image
img = loadImage("road.jpg");
imgCar = loadImage("car.jpg");
imgSplash1 = loadImage("splash1.jpg");
imgSplash2 = loadImage("splash2.jpg");
imgSplash3 = loadImage("splash3.jpg");

//Car starting positions, direction, and speed
for (int i=0; i<cars.length; i++) {
    cars[i] = new Car(random(width), 135, -12);
}
//Player starting poition
alien = new Player(400, 550);

//Collectable ship parts position
part1 = new Part(175, 150);
part2 = new Part(620, 250);
part3 = new Part(399, 350);
}

void draw() {

if (currentLevel == 0) {
    level0();
}
else if (currentLevel == 1) {
    level1();
}
else if (currentLevel == 2) {
    level2();
}
else if (currentLevel == 3) {
    level3();
}
else if (currentLevel == 4) {
    level4();
}
else if (currentLevel == 5) {
    level5();
}
else if (currentLevel == 6) {
    level6();
}
else if (currentLevel == 7) {
    level7();
}
else if (currentLevel == 8) {
    level8();
}
else if (currentLevel == 9) {
    level9();
}
else if (currentLevel == 10) {
    level10();
}
}

void gameOver() {
textFont(f, 42);
textAlign(CENTER);
background(255);
fill(0);
text("GAME OVER", width/2, height/2);
text("SPACEBAR TO RESTART", width/2, 350);
if (keyPressed) {
    if (key == ' ') {
      currentLevel = 0;
    }
}
}

//LEVEL 0
void level0() {
image(imgSplash1, 0, 0);

if (mousePressed) {
    currentLevel = 1;
}
}

//LEVEL 1
void level1() {

if (lives == 0) {
    gameOver();
}
else {

    if (score >= 3) {
      currentLevel = 2;
    }
    else {

      //Display game info
      image(img, 0, 0);
      fill(0);
      text("Lives: " + lives, 100, 35);

      //Initialise cars
      for (int i = 0; i < cars.length; i++) {
        cars[i].move(-8);
      }
    }

    //Initialise player
    alien.show();

    //Initialise collectable parts
    part1.appear1();
    part2.appear2();
    part3.appear3();

    //      Check for player getting hit by cars
    //      if (cars.intersect(alien)) {
    //        alien.die();
    //      }
    //      if (car2.intersect(alien)) {
    //        alien.die();
    //      }
    //      if (car3.intersect(alien)) {
    //        alien.die();
    //      }
    //      if (car4.intersect(alien)) {
    //        alien.die();
    //      }
    //      if (car5.intersect(alien)) {
    //        alien.die();
    //      }
    //      if (car6.intersect(alien)) {
    //        alien.die();
    //      }
    //      if (car7.intersect(alien)) {
    //        alien.die();
    //      }
    //      if (car8.intersect(alien)) {
    //        alien.die();
    //      }
    //      if (car9.intersect(alien)) {
    //        alien.die();
    //      }
    //      if (car10.intersect(alien)) {
    //        alien.die();
    //      }
    //      if (car11.intersect(alien)) {
    //        alien.die();
    //      }
    //      if (car12.intersect(alien)) {
    //        alien.die();
    //      }
    //      if (car13.intersect(alien)) {
    //        alien.die();
    //      }
    //      if (car14.intersect(alien)) {
    //        alien.die();
    //      }

    //Check for player collecting ship parts
    if (part1.intersect(alien)) {
      part1.collect1();
    }
    if (part2.intersect(alien)) {
      part2.collect2();
    }
    if (part3.intersect(alien)) {
      part3.collect3();
    }
}
}

//LEVEL 2
void level2() {
image(imgSplash2, 0, 0);

if (mousePressed) {
    currentLevel = 3;
}
}

//LEVEL 3
void level3() {

textFont(f, 42);
textAlign(CENTER);
background(255);
fill(0);
text("THIS IS LEVEL 3", width/2, height/2);
text("SPACEBAR TO WIN", width/2, 350);
if (keyPressed) {
    if (key == ' ') {
      currentLevel = 4;
    }
}
}

//LEVEL 4
void level4() {
textFont(f, 42);
textAlign(CENTER);
background(255);
fill(0);
text("THIS IS LEVEL 4", width/2, height/2);
text("SPACEBAR TO WIN", width/2, 350);
if (keyPressed) {
    if (key == ' ') {
      currentLevel = 5;
    }
}
}

//LEVEL 5
void level5() {
textFont(f, 42);
textAlign(CENTER);
background(255);
fill(0);
text("THIS IS LEVEL 5", width/2, height/2);
text("SPACEBAR TO WIN", width/2, 350);
if (keyPressed) {
    if (key == ' ') {
      currentLevel = 6;
    }
}
}

//LEVEL 6
void level6() {
textFont(f, 42);
textAlign(CENTER);
background(255);
fill(0);
text("THIS IS LEVEL 6", width/2, height/2);
text("SPACEBAR TO WIN", width/2, 350);
if (keyPressed) {
    if (key == ' ') {
      currentLevel = 7;
    }
}
}

//LEVEL 7
void level7() {
textFont(f, 42);
textAlign(CENTER);
background(255);
fill(0);
text("THIS IS LEVEL 7", width/2, height/2);
text("SPACEBAR TO WIN", width/2, 350);
if (keyPressed) {
    if (key == ' ') {
      currentLevel = 8;
    }
}
}

//LEVEL 8
void level8() {
textFont(f, 42);
textAlign(CENTER);
background(255);
fill(0);
text("THIS IS LEVEL 8", width/2, height/2);
text("SPACEBAR TO WIN", width/2, 350);
if (keyPressed) {
    if (key == ' ') {
      currentLevel = 9;
    }
}
}

//LEVEL 9
void level9() {
textFont(f, 42);
textAlign(CENTER);
background(255);
fill(0);
text("THIS IS LEVEL 9", width/2, height/2);
text("SPACEBAR TO WIN", width/2, 350);
if (keyPressed) {
    if (key == ' ') {
      currentLevel = 10;
    }
}
}

//LEVEL 10
void level10() {
textFont(f, 42);
textAlign(CENTER);
background(255);
fill(0);
text("THIS IS LEVEL 10", width/2, height/2);
text("YOU HAVE WON", width/2, 350);
}

//Create class player
class Player {
int x_, y_, r;

Player(int pXPos, int pYPos) {
    x_ = pXPos;
    y_ = pYPos;
}

//Create show function for player
void show() {
    r = 15; //Player size
    smooth();
    fill(255, 246, 180);
    stroke(0);
    strokeWeight(2);
    ellipse(x_, y_, r*2, r*2); //Body
    fill(255);
    ellipse(x_-10, y_-5, 15, 15); //Eye #1
    ellipse(x_+10, y_-5, 15, 15); //Eye #2
    fill(0);
    ellipse(x_-10, y_-5, 7, 7);    //Pupil #1
    ellipse(x_+10, y_-5, 7, 7);    //Pupil #2
    fill(255, 0, 0);
    ellipse(x_-15, y_+ r, 18, 10); //Foot #1
    ellipse(x_+15, y_+ r, 18, 10); //Foot #2

    if (y_ < 50) { //Prevent player from going off top of screen
      y_ = 50;
    }
    if (y_ > 550) { //Prevent player from going off bottom of screen
      y_ = 550;
    }
    if (x_ <= 0 + r) { //Lose a life if player goes off left of screen
      alien.die();
    }
    if (x_ >= width - r) { //Lose a life if player goes off right of screen
      alien.die();
    }
    if (x_ > 650 && y_ < 100) {
      x_ = 650;
    }
}
//Specify movement speeds for player
void Down() {
    y_= y_+100;
}

void Up() {
    y_= y_-100;
}

void Left() {
    x_= x_-30;
}

void Right() {
    x_= x_+30;
}

//Specify "respawn" point and die function
void die() {
    x_= 400;
    y_= 550;
    lives --;
}
}
//Player movement controls
void keyPressed() {
if (key==CODED) {
    if (keyCode==DOWN) {
      alien.Down();
    }
    else if (keyCode==UP) {
      alien.Up();
    }
    else if (keyCode==LEFT) {
      alien.Left();
    }
    else if (keyCode==RIGHT) {
      alien.Right();
    }
}
}

Player alien;

Part part1;
Part part2;
Part part3;

Here's the Cars class

class Car {
float xPos;
int yPos;
int speed;
int cr = 15;
Car(float tempXPos, int tempYPos, int tempSpeed) {
    xPos = tempXPos;
    yPos = tempYPos;
    speed = tempSpeed;
}

//Create move function for cars
void move(int speed) {
    image(imgCar, xPos, yPos);
    cr = 15;
    xPos = xPos +speed;
    if (xPos > width) { //Cars reset if they go off screen
      xPos = 0;
    }
    if (xPos < 0) {
      xPos = width;
    }
}

//Specify intersect conditions for player and cars
boolean intersect(Player a) {
    float distance = dist(xPos, yPos, a.x_, a.y_);
    if (distance < cr + a.r) {
      return true;
    }
    else {
      return false;
    }
}
}

And the Parts class

class Part {
float x_;
float y_;
float d;

Part(int posX, int posY) {
    x_ = posX;
    y_ = posY;
}

//Create appearance of first part
void appear1() {
    d = 20;
    strokeWeight(1);
    smooth();
    fill(117, 203, 155);
    ellipse(x_, y_, d, d*2);
    fill(206, 206, 206);
    strokeWeight(2);
    ellipse(x_, y_-5, d/2, d/2);
    fill(255, 0, 0);
    strokeWeight(1);
    ellipse(x_, y_+5, d/4, d/4);
    ellipse(x_, y_+10, d/4, d/4);
}

//Create collect function for first part
void collect1() {
    x_ = 700;
    y_ = 50;
    score++;
}

//Create appearance of second part
void appear2() {
    smooth();
    triangle(x_+5, y_+4, x_+5, y_-10, x_+20, y_+15);
    triangle(x_-5, y_+4, x_-5, y_-10, x_-20, y_+15);
    fill(117, 203, 155);
    rectMode(CENTER);
    rect(x_, y_-2, 10, 12);
    fill(255, 255, 0);
    noStroke();
    triangle(x_-4, y_+4, x_+5, y_+4, x_, y_+18);
    fill(255, 68, 0);
    triangle(x_-2, y_+4, x_+3, y_+4, x_, y_+12);
}

//Create collect function for second part
void collect2() {
    x_ = 745;
    y_ = 50;
    score++;
}
//Create appearance of third part
void appear3() {
    fill(86, 86, 86);
    stroke(0);
    strokeWeight(1);
    triangle(x_, y_-10, x_-2, y_+8, x_+2, y_+8);
    fill(117, 203, 155);
    ellipse(x_, y_+7, 10, 4);
    ellipse(x_, y_-11, 4, 4);
}

//Creat ecollect function for third part
void collect3() {
    x_ = 775;
    y_ = 50;
    score++;
}

//Specify intersect conditions for player and parts
boolean intersect(Player a) {
    float distance = dist(x_, y_, a.x_, a.y_);
    if (distance < d + a.r ) {
      return true;
    }
    else {
      return false;
    }
}
}

Replies(8)

calsign

Re: Specifying information within loops to populate arrays.

1 year ago

Should the positions be randomly assigned?
Lacking any other possibilities... I'm going with that...

A way to do that is to store the values in an array, and then get a random value from that array:

//Global Variables
int[] possibleXPositions = {135, 235, 335, 445};
int[] possibleSpeeds = {-12, 8, -5, 4};
//Initialization of the cars
for (int i=0; i<cars.length; i++) {
int num = random(4); //Which array item to use
cars[i] = new Car(random(width), possibleXPositions[num], possibleSpeeds[num]);
}

For intersection with the players, that is merely another loop of the cars...

captpresi..

Re: Specifying information within loops to populate arrays.

1 year ago

Thanks for replying, I feel really stupid for not thinking of that solution; however I still get an error with the line

int num = random(4);

It says "cannot convert from float to int" and I'm a bit lost as to what's going on with it.

Plus, I have no idea what you mean by "merely another loop of the cars". I'm stumped :(

calsign

Re: Specifying information within loops to populate arrays.

1 year ago

Okay... for that line, just cast it to an int like so:

int num = (int) random(4);

I didn't get to test the code beforehand...

Also, I was being rather brief when I said "merely another loop of the cars"...
I supposed I don't understand how your previously existing collision detection worked.
I can't properly test your code (lack of images)...

Basically, though, what I had in mind was a for loop looping through all of the cars, and, for each car, performing collision detection with the player...

captpresi..

Re: Re: Specifying information within loops to populate arrays.

1 year ago

Yeah, I eventually saw what was wrong with the int num line.

I had this set up to detect collisions, which worked:

    //      Check for player getting hit by cars
    if (cars.intersect(alien)) {
      alien.die();
    }
    if (car2.intersect(alien)) {
      alien.die();
    }
    if (car3.intersect(alien)) {
      alien.die();
    }
    if (car4.intersect(alien)) {
      alien.die();
    }
    if (car5.intersect(alien)) {
      alien.die();
    }
    if (car6.intersect(alien)) {
      alien.die();
    }
    if (car7.intersect(alien)) {
      alien.die();
    }
    if (car8.intersect(alien)) {
      alien.die();
    }
    if (car9.intersect(alien)) {
      alien.die();
    }
    if (car10.intersect(alien)) {
      alien.die();
    }
    if (car11.intersect(alien)) {
      alien.die();
    }
    if (car12.intersect(alien)) {
      alien.die();
    }
    if (car13.intersect(alien)) {
      alien.die();
    }
    if (car14.intersect(alien)) {
      alien.die();
    }

But now most things I try result in static reference and non-static method errors which I'm not sure how to solve. I can't provide an instance as far as I can tell so would I only be left with making the method static or the reference non-static?

captpresi..

Re: Specifying information within loops to populate arrays.

1 year ago

Ok, solved the cannot convert float to int business but still lost as to how to manage the intersection problem :(

calsign

Re: Specifying information within loops to populate arrays.

1 year ago

Okay, here's the question: Were you performing collision detection before, and if you were, how?

captpresi..

Re: Re: Specifying information within loops to populate arrays.

1 year ago

Never mind, your loop idea worked :) Thanks a million. I started teaching myself this Processing malarkey on Monday and I'd be lost without people like you.

calsign

Re: Specifying information within loops to populate arrays.

1 year ago

I'm glad you figured it out...
I was about to respond, but the forum software started getting wonky...

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