Making tons of bullets flying in random directions

Processing Coding Questions
1

So I have a game here:

int x = 500;
int y = 300;
int f1 = 255;
int f2 = 255;
int f3 = 255;
int ap = 120;
int hp = 190;
boolean showrange = true;
PFont font;
float xSpeed = 0;
float ySpeed = 0;

BulletSystem b1;

boolean keyLeft, keyRight, keyUp, keyDown;

void setup() {
  size(1000, 600);
  frameRate(1000);
  font = loadFont("CenturyGothic-48.vlw");
  textFont(font);
  b1 = new BulletSystem();
}

void draw() {
  background(255);

  noStroke();
  strokeCap(ELLIPSE);
  fill(89, 200, 222, 40);
  if (showrange == true) ellipse(x, y, 420, 420);
  
  
  //player
  strokeWeight(2);
  stroke(0);
  strokeCap(ELLIPSE);
  fill(255);
  ellipse(x, y, 30, 30);
  strokeWeight(1);
  fill(f1, f2, f3);
  ellipse(x, y, 10, 10);
  
  b1.addParticle();

  //laser
  strokeWeight(8);
  stroke(255, 0, 0);
  strokeCap(SQUARE);
  if (mousePressed && overCircle(x, y, 420) == true) {
    line(x, y, mouseX, mouseY);
    strokeWeight(3);
    stroke(255, 140, 0);
    line(x, y, mouseX, mouseY);
    f1 = 255;
    f2 = 0;
    f3 = 0;
  } else {
    f1 = 255;
    f2 = 255;
    f3 = 255;
  }

  strokeWeight(1);
  stroke(0);
  strokeCap(ELLIPSE);

  //hotbar
  fill(0, 140);
  rect(-1, 530, 1000, 70);

  //hotbar - hearth and armor points
  strokeWeight(19);
  stroke(60);
  strokeCap(SQUARE);
  line(33, 578, 192, 578);
  line(33, 552, 122, 552);
  strokeWeight(15);
  stroke(74, 189, 189);
  if (ap > 35) {
  line(35, 552, ap, 552);
  }
  stroke(204, 78, 71);
  if (hp > 35) {
  line(35, 578, hp, 578);
  }
  fill(255);
  textSize(15);
  if (ap > 35) {
  text(ap - 35, 210, 557);
  } else text(0, 208, 557);
  if (hp > 35) {
  text(hp - 35, 208, 583);
  } else text(0, 208, 583);

  strokeWeight(1);
  stroke(0);
  strokeCap(ELLIPSE);
  
  //movement
  countSpeed();   //Change speed based on current keys pressed.
  changePosition(); //Change position based on speed.

  xSpeed *= 0.9; //Apply some drag so that the square wouldn't fly off the screen indefinitely
  ySpeed *= 0.9;
}


void countSpeed() {
  if (x > 40 && keyLeft) xSpeed-= 0.5;
  if (x < 970 && keyRight) xSpeed+= 0.5;
  if (y > 40 && keyUp) ySpeed-= 0.5;
  if (y < 500 && keyDown) ySpeed+= 0.5;
}


void changePosition() {
  x+=xSpeed;
  y+=ySpeed;
}


void keyPressed() {
  if (key == 'w') {
    keyUp = true;
  }
  if (key == 's') {
    keyDown = true;
  }
  if (key == 'a') {
    keyLeft = true;
  }
  if (key == 'd') {
    keyRight = true;
  }
}

void keyReleased() {
  if (key == 'w') {
    keyUp = false;
  }
  if (key == 's') {
    keyDown = false;
  }
  if (key == 'a') {
    keyLeft = false;
  }
  if (key == 'd') {
    keyRight = false;
  }
}

boolean overCircle(float x, float y, int diameter) {
  float disX = x - mouseX;
  float disY = y - mouseY;
  if (sqrt(sq(disX) + sq(disY)) < diameter/2 ) {
    return true;
  } else {
    return false;
  }
}

Basically there is a circle moving around and it can shoot a laser in its range. But there are no enemies to shoot.
What I want to do is have a lot of bullets spawning randomly and shooting in random directions. When one of them hits the player, players health gets low and when the player hits one with the laser; it goes away.
In order to do this, I made a bullet class:

class BulletSystem {
  ArrayList<Bullet> particles;

  BulletSystem() {
    particles = new ArrayList<Bullet>();
  }

  void addParticle() {
    particles.add(new Bullet());
  }

  void run() {
    int i = particles.size()-1;
    for (i = particles.size()-1; i >= 0; i = i - 1) {
      Bullet p = particles.get(i);
      p.display();
      if (p.isDead()) {
        particles.remove(i);
      }
    }
  }
}

class Bullet {
  
  Bullet() {  
  }
  
  float x1 = random(0,1000);
  float y1 = random(0,600);
  int w = 15;
  
  //so here I thought would work but...
  float r = random(0,3);
  void display() {
    
    if (r == 0) { 
      x1++; 
      y1++;
    } else
    if (r == 1) {
      x1--; 
      y1++;
    } else
    if (r == 2){
      x1++; 
      y1--;
    } else
    if (r == 3) {
      x1--; 
      y1--;
    }
    //it did not.
    
    //draw the bullet
    fill(0);
    ellipse(x1,y1,w,15);
    
    //death to the bullet by laser
    if (mousePressed && overCircle1(x,y,420) == true && overCircle(x1,y1,20) == true) {
      w = 0;
      x1 = -10;
      y1 = -10;
    }
    
    //damage to the player by bullet
    if (overCircle1(x,y,40) == true) {
      if (ap > 0) ap = ap - 5;
      else hp = hp - 5;
      w = 0;
      x1 = -10;
      y1 = -10;
    }
  }
  
  boolean isDead() {
    if (x1 == -10 && y1 == -10) {
      return true;
    } else {
      return false;
    }
  }
  
  boolean overCircle1(float x, float y, int diameter) {
  float disX = x - x1;
  float disY = y - y1;
  if (sqrt(sq(disX) + sq(disY)) < diameter/2 ) {
    return true;
  } else {
    return false;
  }
}
  
}

The damage, gone when shot with laser and random spawn parts are done. What I want now is to spawn a lot of them randomly and make them move randomly in random directions. But I can’t quite figure out how to?

1 Like
2

Hello,

This may be of interest:
https://processing.org/examples/simpleparticlesystem.html
https://natureofcode.com/book/
https://natureofcode.com/book/chapter-4-particle-systems

:)

2 Likes
3

Thanks a lot! That helped making a lot of them spawn randomly. Still need to figure out a way to do the movement though.

4

please show your entire runable code so we can take a look and help you

1 Like
5

The code above is my entire code (and there is no images, there is font tho I need to comment that out), I just added and array to spawn a lot of bullets. And in the bullet class look at the part where I commented.

6

???

err… this sentences suggest you made changes to your code.

Or did you update your code above?

7

I will update in a second just added an arraylist.
edit: @Chrisir updated!

8 



int x = 500;
int y = 300;
int f1 = 255;
int f2 = 255;
int f3 = 255;
int ap = 120;
int hp = 190;
boolean showrange = true;
PFont font;
//float xSpeed = 0;
//float ySpeed = 0;

BulletSystem b1;

boolean keyLeft, keyRight, keyUp, keyDown;

void setup() {
  size(1000, 600);
  frameRate(1000);
  cursor(CROSS);
  font = createFont("CenturyGothic-48.vlw", 16);
  textFont(font);
  b1 = new BulletSystem();
}

void draw() {
  background(255);

  noStroke();
  strokeCap(ELLIPSE);
  fill(89, 200, 222, 40);
  if (showrange)
    ellipse(x, y, 420, 420);

  //player
  strokeWeight(2);
  stroke(0);
  strokeCap(ELLIPSE);
  fill(255);
  ellipse(x, y, 30, 30);
  strokeWeight(1);
  fill(f1, f2, f3);
  ellipse(x, y, 10, 10);

  // b1.addParticle();
  b1.run();

  //laser
  strokeWeight(8);
  stroke(255, 0, 0);
  strokeCap(SQUARE);
  if (mousePressed && overCircle(x, y, 420) ) {
    //line(x, y, mouseX, mouseY);
    strokeWeight(3);
    stroke(255, 140, 0);
    // line(x, y, mouseX, mouseY);
    f1 = 255;
    f2 = 0;
    f3 = 0;
    b1.addParticle();
  } else {
    f1 = 255;
    f2 = 255;
    f3 = 255;
  }

  strokeWeight(1);
  stroke(0);
  strokeCap(ELLIPSE);

  //hotbar
  fill(0, 140);
  rect(-1, 530, 1000, 70);

  //hotbar - hearth and armor points
  strokeWeight(19);
  stroke(60);
  strokeCap(SQUARE);
  line(33, 578, 192, 578);
  line(33, 552, 122, 552);
  strokeWeight(15);
  stroke(74, 189, 189);
  if (ap > 35) {
    line(35, 552, ap, 552);
  }
  stroke(204, 78, 71);
  if (hp > 35) {
    line(35, 578, hp, 578);
  }
  fill(255);
  textSize(15);
  if (ap > 35) {
    text(ap - 35, 210, 557);
  } else text(0, 208, 557);
  if (hp > 35) {
    text(hp - 35, 208, 583);
  } else text(0, 208, 583);

  strokeWeight(1);
  stroke(0);
  strokeCap(ELLIPSE);

  //movement
  // countSpeed();   //Change speed based on current keys pressed.
  // changePosition(); //Change position based on speed.

  //xSpeed *= 0.9; //Apply some drag so that the square wouldn't fly off the screen indefinitely
  //ySpeed *= 0.9;
}


void countSpeed() {
  //if (x > 40 && keyLeft) xSpeed-= 0.5;
  //if (x < 970 && keyRight) xSpeed+= 0.5;
  //if (y > 40 && keyUp) ySpeed-= 0.5;
  //if (y < 500 && keyDown) ySpeed+= 0.5;
}


void changePosition111() {
  //x+=xSpeed;
  //y+=ySpeed;
}


void keyPressed() {
  if (key == 'w') {
    keyUp = true;
  }
  if (key == 's') {
    keyDown = true;
  }
  if (key == 'a') {
    keyLeft = true;
  }
  if (key == 'd') {
    keyRight = true;
  }
}

void keyReleased() {
  if (key == 'w') {
    keyUp = false;
  }
  if (key == 's') {
    keyDown = false;
  }
  if (key == 'a') {
    keyLeft = false;
  }
  if (key == 'd') {
    keyRight = false;
  }
}

boolean overCircle(float x, float y, 
  int diameter) {
  float disX = x - mouseX;
  float disY = y - mouseY;
  if (sqrt(sq(disX) + sq(disY)) < diameter/2 ) {
    return true;
  } else {
    return false;
  }
}

// ==========================================================================================================

class BulletSystem {

  ArrayList<Bullet> particles;

  BulletSystem() {
    particles = new ArrayList<Bullet>();
  }

  void addParticle() {
    particles.add(new Bullet());
  }

  void run() {
    for (int i = particles.size()-1; i >= 0; i--) {
      Bullet p = particles.get(i);
      p.display();
      if (p.isDead()) {
        //  particles.remove(i);
      }
    }
  }
}

// ==========================================================================================================

class Bullet {

  float x1 = 500; //  random(0, 1000);
  float y1 = 300; //  random(0, 600);
  int w = 4;

  float xspeed=1;
  float yspeed=1;

  //so here I thought would work but...
  float r = random(0, 3);

  // origin 
  PVector position = new PVector(x, y);

  Bullet() {
    // constr
    float angle = update(mouseX, mouseY);
    xspeed = cos(angle);
    yspeed = sin(angle);
  }

  float update(int mx, int my) {
    //determines angle to mouse
    float angle = atan2(float(my)-(position.y), float(mx)-(position.x));
    return angle;
  }

  void display() {

    /*
    if (r == 0) { 
     x1++; 
     y1++;
     } else
     if (r == 1) {
     x1--; 
     y1++;
     } else
     if (r == 2) {
     x1++; 
     y1--;
     } else
     if (r == 3) {
     x1--; 
     y1--;
     }
     */
    //it did not.

    //draw the bullet
    fill(255, 0, 0);
    noStroke(); 
    ellipse(x1, y1, 
      w, w);

    x1+=xspeed; 
    y1+=yspeed; 

    //death to the bullet by laser
    if (mousePressed && overCircle1(x, y, 420) == true && overCircle(x1, y1, 20) == true) {
      //    w = 0;
      // x1 = -10;
      y1 = -10;
    }

    //damage to the player by bullet
    if (overCircle1(x, y, 40) == true) {
      if (ap > 0) ap = ap - 5;
      else hp = hp - 5;
      //w = 0;
      //x1 = -10;
      //y1 = -10;
    }
  }

  boolean isDead() {
    if (x1 == -10 && y1 == -10) {
      return true;
    } else {
      return false;
    }
  }

  boolean overCircle1(float x, float y, int diameter) {
    float disX = x - x1;
    float disY = y - y1;
    if (sqrt(sq(disX) + sq(disY)) < diameter/2 ) {
      return true;
    } else {
      return false;
    }
  }
}
//
2 Likes
9

Hey,
Thanks so much!
That was not what I wanted exactly(I can probably do it too based on this) on this post but it was another thing I was trying to implement in this game (I couldn’t so I added the laser lol). And also I didin’t know cursor() function existed also thanks for adding that.

1 Like
10

Great!

You are welcome!

1 Like