Question about what a number does in an if statement

lolnyancats

for(int i=pacdot.size()-1;i>=0;i--){
     if(abs(pacdots.get(i).x-x)<10&&(abs(pacdots.get(i).y-y)<10)
          pacdots.remove(i);
}

what does the 10 do in the if statement?

colouredmirrorball

pacdots.get(i).x is a coordinate. The second x is a variable. The difference is the distance between the two. abs() is absolute value (it makes negative values positive). So, it checks if the distance between the pacdot and the variable x is less than 10. Same for y.

lolnyancats

PImage title, map;
int gamemode=0;
int dotType=0;
int totalDots;
int dotsEaten=0;
int i=0;
int points=0;
//height is 1080 width is 1920
//gamemode 1 is title, 2 is map, 3 is cherries,4 is finished successsfully, 5 is dead

map loadmap=new map();
newGame game=new newGame(0, 0);
//write wr=new write(0);
ArrayList<Pacdot> pacdots;
pacmanSprite pac=new pacmanSprite(25, 25, 0, 0);

void setup() {

  frameRate(30);
  size(displayWidth, displayHeight);
  gamemode=1; //gamemode is started
  pacdots=new ArrayList<Pacdot>();
  for (int y=25; y<height-25; y+=25) {
    int x=25;
    pacdots.add(new Pacdot(x, y));
  }
  for (int x=25; x<width-25; x+=25) { //top bar of circles
    int y=25;
    pacdots.add(new Pacdot(x, y));
  }
  for (int y=25; y<height-25; y+=25) {
    int x=width-25;
    pacdots.add(new Pacdot(x, y));
  }
  for (int x=25+25; x<width-25; x+=25) {
    int y=height-25;
    pacdots.add(new Pacdot(x, y));
  }
  for (int x=25+25; x<width-25; x+=25) {
    int y=height/2;
    pacdots.add(new Pacdot(x, y));
  }
  for (int y=25+25; y<height/2-25; y+=25) {
    int x=width/2;
    pacdots.add(new Pacdot(x, y));
  }
  for (int y=height/2+25; y<height-25; y+=25) {
    int x=width/2;
    pacdots.add(new Pacdot(x, y));
  }
}

void draw() {
  game.display();
  loadmap.loadMap();
  gamemode();
  if (mousePressed==true) {
    println(mouseX+","+mouseY);
  }
  // wr.setupW();
  //wr.output();
  pac.display();
 pac.eatDot();
}
void keyPressed() {

  if (key==' '&&gamemode==1) {
    gamemode=2;//gamemode map is started
    println(gamemode);
  } else if ((key=='a'&&gamemode==2)||(key=='A'&&gamemode==2)) {
    gamemode=3;
    println(gamemode);
  }
}

void gamemode() {
  if (gamemode==1) {
    text("press space to continue", width/2, height/2);
  }
  if (gamemode==2) {
    text("press a to spawn map  ", 15, 15);
    fill(0);
    text("points"+points,100,100);
  }
  if (gamemode==3) { 
  for (int i=0; i<pacdots.size (); i++)
    pacdots.get(i).display(); 
  }

}


class map {
  public map() {
  }
  void loadMap() {
    if (gamemode==2) {
      int size=2; //background start
      for (int h = 0; h < width; h += size) {
        for (int v = 0; v < height; v += size) {
          if ((h+v) % 20 ==0) { 
            fill(0,0,150);
          } else {
            fill(0,0,255);
          }
          rect (h, v, size, size);
        }
      }
    } //background end
    //draw the 4 rects that pac man can not go through
    //map is under gamemode stuff
    if(gamemode==3){
      rectMode(CORNERS);
      fill(#C9610C);
      rect(50,50,width/2-25,height/2-25);
      rect(50,height/2+25,width/2-25,height-50);
      rect(width/2+25,50,width-50,height/2-25);
      rect(width/2+25,height/2+25,width-50,height-50);
    }
  }
}


class newGame{
  private int x,y;
  public newGame(int xLocationTitleScreen,int yLocationTitleScreen){
    x=xLocationTitleScreen;
    y=yLocationTitleScreen;
  }
  void display(){
   // title=loadImage("title.png");
    //if(gamemode==1){//if gamemode is started
      //image(title,x,y,width,height);
    }
  }
}


public class Pacdot {
  float x, y;
  public Pacdot(float xpos, float ypos) {
    x=xpos;
    y=ypos;
  }
  void display() {
    if (gamemode==3) {
      fill(#F8FC00);
      ellipseMode(CENTER);
      ellipse(x, y, 15, 15);
    }
  }
}


class pacmanSprite {
  private float x, y, speedx, speedy;
  public pacmanSprite(float xpos, float ypos, float speedXpos, float speedYpos) {
    x=xpos;
    y=ypos;
    speedx=speedXpos;
    speedy=speedYpos;
  }
  void display() {
    println(x+","+y+","+speedx+","+speedy);
    float px=x, py=y;
    if (gamemode==3) {
      fill(0);
      ellipse(x, y, 25, 25);
      x+=speedx;
      y+=speedy;
      if (keyPressed==true) {
        if (key=='w'&&boundary()==false) {
          speedy=-10;
          speedx=0;
        }
        else if (key=='a'&&boundary()==false) {
          speedx=-10;
          speedy=0;
        }
        else if (key=='s'&&boundary()==false) {
          speedy=10;
          speedx=0;
        }
        //if a boundary is ahead get him back on track
        else if (key=='s'&&boundary()==true) {
          speedy=0;
          speedx=10;
          println(boundary());
        }
        else if (key=='d'&&boundary()==false) {
          speedx=10;
          speedy=0;
        }
      }
    }
  }
  void eatDot() {
  for(int i=pacdot.size()-1;i>=0;i--){
 if(abs(pacdots.get(i).x-x)<10&&(abs(pacdots.get(i).y-y)<10)
      pacdots.remove(i);
  }
  }
  boolean boundary() {
    if((y<=25)){
    return false;
    }
    else{
      return true;
    }
  }
}

what should 10 be?

Chrisir

pacdots.get(i).x-x

it would be better readable if you would name the 2nd x as pacmanX (or so)

do you know what abs() is? Look it up.

we are talking about eat dot (eatDot()) here: When pacman is close to a dot, the dot gets eaten (it's removed)

when it's not working try 20 instead of 10 or so

also remember to hit ctrl-t in processing more often

;-)

Chrisir

10 is just the distance for x and for y

when both distances are smaller than 10, pacman eats the dot

lolnyancats

@chrisir thanks man :)

lolnyancats

@Chrisir can you help me witha new issue?

class Grid {
  private int wid, heig, sqw;
  private color c;
  public Grid(int widthh, int heightt, int sqwidth, color col){
    wid=widthh;
    heig=heightt;
    sqw=sqwidth;
    c=col;
  }
    void display() {
    for (int q=0; q < height/heig; q += 0) {//y
      for ( int w=0; w < width/wid; w += 0) {//x
      println(height/heig);
        fill(c);
        rect(q, w, sqw, sqw);
        w+=sqw;
      }
      q+=sqw;
    }
  }
}

i am trying to create a gird of squares the size of wid and heig. Like block wise. How would I do that?

Chrisir

int cellSize = 16;

void setup() { 
  size(400, 400); 
  background(255);
} // func

void draw() {
  background(255); 
  for (int a = 0; a < width/cellSize; a++) { 
    for (int b = 0; b < height/cellSize; b++) { 
      stroke(255); 
      fill(0); 
      if (mousePressed && 
        mouseX > a*cellSize && mouseX < a*cellSize + cellSize && 
        mouseY > b*cellSize && mouseY < b*cellSize + cellSize) {
        fill(255, 2, 2);
      } // if 
      rect(a*cellSize, b*cellSize, 
      cellSize, cellSize);
    } // for
  } // for
} // func
// 

lolnyancats

@Chrisir can you recreate this with variables cellWidth and cellHeight?

Chrisir

you don't have a clue, uh?

Chrisir

int cellSizeX = 16;
int cellSizeY = 10;

void setup() { 
  size(600, 600); 
  background(255);
  stroke(255, 2, 2); 
  fill(0);
} // func

void draw() {
  background(255); 
  for (int x = 0; x < 400/cellSizeX; x++) { 
    for (int y = 0; y < 400/cellSizeY; y++) { 
      rect(x*cellSizeX+12, y*cellSizeY+19, 
      cellSizeX, cellSizeY);
    } // for
  } // for
} // func
// 

lolnyancats

@Chrisir nope, only my first year programming....

lolnyancats

@Chrisir would you be willing to walk me through a game when I am having troubles? It is due tomorrow... I have been working really hard but, have been struggling...

Chrisir

sure

lolnyancats

okay, @Chrisir my skype is classified

Chrisir

solved.