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How to create a premade list of objects that move down and are respawned at the top.

[1 Reply]
- 09-Apr-2013 03:16 PM
- Forum: Programming Questions
I want a large amount of objects that I have already started as an ArrayList and have running on a timer. However I want to make many objects and the method I am using will be long and tedious. Is there a better way to use the code i have to make a lot of objects in specific positions, move down at once?

I am trying to create a game similar to the asteroid levels of radiant.

Here is my code so far...

int gamestate=1;

int lives=3;

int score=0;

float multiplier=1;

int lasts = 0;

int s = 0;

ArrayList<PVector> asteroids = new ArrayList <PVector>();

PVector a;

float[] circleX = new float [39];

float[] circleY = new float [39];

ArrayList<PVector> projectiles = new ArrayList<PVector>();

int last = 0;

int m = 0;

float shipX, shipY;

float sizes;

color colours;

PVector p;

void setup() {

size(800, 600);

smooth();

formShip();

formCircles();

}

void draw() {

background(0);

noStroke();

if (gamestate==1) {

menu();

if (mouseX>300 && mouseX< 500 && mouseY>300 && mouseY< 400 && mousePressed) {

gamestate=2;

}

}

if (gamestate==2) {

drawShips();

updateProjectiles();

updateAsteroids();

// asteroidCollision();

if (moveShip()) {

if (keyPressed) {

if (keyCode == LEFT) {

shipX -=4;

}

if (keyCode == RIGHT) {

shipX +=4;

}

}

}

if (shipX > width-25) {

shipX = width-26;

}

if (shipX < 25) {

shipX = 26;

}

m = millis()-last;

if (millis() > last+400) {

last = millis();

}

if (m>10 && m < 20) {

addProjectile(shipX+45);

}

if (m>210 && m < 220) {

addProjectile(shipX-45);

}

s = millis()-lasts;

if (millis() > lasts+1200) {

lasts = millis();

}

asteroidPlacement();

drawCircle();

moveCircles();

shootingStuff();

textSize(20);

text(lives, 750, 25);

text("Lives =", 675, 25);

text(multiplier, width/2, 25);

text("X", width/2-20, 25);

text(score, 50, 25);

if (lives<=0) {

gamestate=3;

}

}

else if (gamestate==3) {

gameover();

mouseClicked();

lives=3;

shipX=width/2;

}

}

void drawShips() {

drawShip(shipX, shipY, 100, colours);

}

void drawShip(float x, float y, float size, color c) {

float offset=size/4;

rectMode(CENTER);

fill (255);

triangle(x, y-offset, x-size/2, y, x+size/2, y);

triangle(x, y-size+20, x-offset, y-offset+20, x+offset, y-offset+20);

triangle(x-20, y+30, x, y-30, x+20, y+30);

rect(x, y+5, size, 10);

fill(255, 0, 0);

rect(x-size/2+5, y-7.5, 10, 35);

rect(x+size/2-5, y-7.5, 10, 35);

fill(0, 0, 255);

rect(x, y-45, 15, 7);

fill(255, 0, 0);

// rect(x, y-20, 2.5, 20);

// rect(x, y-20, 20, 2.5);

// rect(x-4,y-11,10,2.5);

// rect(x+4,y-29,10,2.5);

// rect(x+9,y-15,2.5,10);

// rect(x-9,y-25,2.5,10);

}

void formShip() {

shipX = width/2;

shipY = 550;

colours = color(random(255), random(255), random(255));

}

boolean moveShip() {

if (shipX > 25 && shipX < width-25) {

return (true);

}

else {

return (false);

}

}

void addProjectile(float x) {

projectiles.add(new PVector(x, shipY-32));

}

void updateProjectiles() {

for (int i=0; i<projectiles.size(); i++) {

PVector p = (PVector)projectiles.get(i);

fill(255, 200, 0);

rect(p.x, p.y, 2.5, 10);

p.y -=6;

if (p.y < 0)

projectiles.remove(p);

}

}

void drawCircle() {

for (int i=0; i<39;i++) {

drawCircles(circleX[i], circleY[i], 30, 255);

}

}

void drawCircles(float x, float y, float size, color c) {

rectMode(CENTER);

fill(255);

ellipse(x, y, 5, 5);

}

void formCircles() {

for (int i=0; i<39; i++) {

circleX[i] = i*20+20;

circleY[i] = (random(-600, 1200));

}

}

void moveCircles() {

for (int i=0; i<39; i++) {

circleY[i] +=10;

if (circleY[i] > 1200) {

circleY[i] = -600;

}

}

}

void addAsteroids(float x, float y) {

asteroids.add(new PVector(x, y));

}

void updateAsteroids() {

for (int i=0;i<asteroids.size();i++) {

PVector a = (PVector)asteroids.get(i);

strokeWeight(2);

stroke(255);

fill(0);

rect(a.x, a.y, 20, 20);

a.y +=10;

if (a.y > 600)

asteroids.remove(a);

if (a.y>shipY-80 && a.y<shipY+30 && a.x>shipX-20 && a.x<shipX+20) {

lives -=1;

asteroids.remove(a);

multiplier=1;

}

else if (a.y>shipY-32 && a.y<shipY && a.x >shipX-55 && a.x < shipX+55) {

lives -=1;

asteroids.remove(a);

multiplier=1;

}

}

}

void asteroidPlacement() {

if (s>10 && s<30)

addAsteroids(width/2, 0);

if (s> 40 && s<60)

addAsteroids(width/4, -100);

if (s>70 && s<90)

addAsteroids(width/2+100, -100);

if (s>0)

score+=2;

}

void menu() {

background(0, 0, 255);

stroke(255, 0, 0);

fill(0, 0, 255);

rect(width/2-150, height/8, 300, 100);

fill(255, 0, 0);

rect(width/2-100, height/2, 200, 100);

fill(0);

textSize(50);

text("Radiant", width/2-100, height/8+68);

textSize(30);

text("Start", width/2-35, height/2+60 );

}

void gameover() {

background(0);

text("GAME OVER", width/2-50, height/2);

score=0;

}

void mouseReleased() {

if (gamestate==3)

gamestate=2;

}

void shootingStuff() {

for (int i=0;i<projectiles.size();i++) {

PVector p=(PVector)projectiles.get(i);

for (int j=0;j<asteroids.size();j++) {

PVector a=(PVector)asteroids.get(j);

if (p.y-5<a.y+10 && p.x+1.25>a.x-10 && p.x-1.25<a.x+10) {

asteroids. remove(a);

projectiles.remove(p);

multiplier +=.1;

score +=100*multiplier;

}

}

}

}

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