Holding the ball in pong

Processing Coding Questions
41

No.

too complicate

finish what you started and don’t go something fancy

finish what you started

1 Like
42

the key involved is the space bar, the space bar makes the ball held/ attached

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43

i tried to put it in if (key == ’ ') and it didn worked.

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44

it’s where you move the paddle with the keys

(Remember the ball is already attached)

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45

Ok, i tried on both ‘w’ key and and ‘s’ keys but the ball instead goes back
on the hold function and nothing happens

1 Like
46

Well show the code

Chrisir

1 Like
47 
int size = 20;    
float xpos, ypos;    
float xspeed = random(5, 6);
float yspeed = random(0.6, 4);

float fehler1=0;
float fehler2=0;

float playerpos1;
float p1x;
float playerpos2;
float p2x;

String tela;

boolean trocou;

int scoreE = 0;
int scoreD = 0;
int scoreW = 10;

boolean hold=false;
boolean attachedToPaddle=false;
boolean move = true;

float easing = 0.05;

void setup() {
  size(640, 400);
  noStroke();
  tela = "MENU";
  frameRate(30);
  smooth();
  playerpos1 =height/2;
  playerpos2 =height/2;
  xpos = 45;
  ypos = playerpos1;
  p1x = 10;
  p2x = width-30;
}

void draw() {

  switch (tela) {

    // ------------------------------------
  case "GAME":

    background(277);

    if (hold && attachedToPaddle)
    {
      // ignore
    } else 
    {
      xspeed *= 1.001;

      xpos += xspeed;
      ypos += yspeed;
    }

    scores();
    hold();

    if (ypos > height-size/2 || ypos < 0+size/2) {
      yspeed *= -1;
    }

    if ( xpos <= 30+size/2) {
      if (ypos > playerpos1-50 && ypos < playerpos1+50) {
        if ( ! (hold && attachedToPaddle)) {
          xspeed *= -1;
          yspeed += (ypos-playerpos1)/5;
        }
        attachedToPaddle=true;
      }
    } else {
      attachedToPaddle=false;
    }


    if (xpos <= 0) {
      fehler1 += 1;
      if (fehler1 <= 4) {
        xpos = 50;
        ypos = playerpos1;
        xspeed = random(5, 6);
        xspeed *= -1;
        yspeed = 0; 
        println("player 2: "+ str(fehler2)+":"+str(fehler1) );
      }
      if (fehler1 ==5) {
        println("player 2 win 5:"+ str(fehler2));
      }
    }

    if ( xpos >= width-30-size/2) {
      if (ypos > playerpos2-50 && ypos < playerpos2+50) {
        xspeed *= -1;
        yspeed += (ypos-playerpos2)/5;
      }
    }
    if (xpos >= width) {
      fehler2 +=1 ;
      if (fehler2 <= 4) {
        xpos = width-50;
        ypos = playerpos2;
        xspeed = -random(5, 6);
        xspeed *= -1;
        yspeed = 0; 
        println("ponto: "+ str(fehler2)+":"+str(fehler1) );
      }
      if (fehler2 ==5) {
        println("player 1 ganhou 5:"+ str(fehler1));
      }
    }

    ellipse(xpos, ypos, size, size);
    rect (p1x, playerpos1-50, 20, 100);
    rect (p2x, playerpos2-50, 20, 100);

    text(str(hold), 333, 33);

    break; 

    // ------------------------------------
  case "MENU":
    menu();
    break;

    // ------------------------------------
  case "TUTORIAL":
    tutorial();
    break;

  }
}

void menu() {
  background(255, 0, 0);
  fill(0, 0, 0); 
  text ("MENU", 
    111, 111);
}

// --------------------------------------------------------------------------

void keyPressed() {


  if (key == 'w') {
    if (playerpos1 >=50)
      playerpos1 = playerpos1 - 8;
      xpos=xpos-8;
  }
  if (key == 's') {
    if (playerpos1 <=height-50)
      playerpos1 = playerpos1 + 8;
      xpos=xpos-8;
  }
  if (key =='a') { 
    p1x = -8;
  }
  if (key == 'd') {
    p1x = +8;
  }

  // -------------------

  if (key == '7')
  {
    if (playerpos2 >=50)
      playerpos2 = playerpos2 - 8;
  }
  if (key == '1') {
    if (playerpos2 <=height-50)
      playerpos2 = playerpos2 + 8;
  }
  /*if (key == '3') {
   xspeed = 0;
   yspeed = 0;
   move = false;
   }
   */
  if (key == ' ') {
    hold = ! hold;
  }

  if (key == ESC) {
    tela="MENU";
    key=0;
  }
}

void keyReleased() {
  //hold = false;
  //attachedToPaddle=false;
}

void mousePressed() {

  switch (tela) {

    // ------------------------------------
  case "GAME":
    break; 

    // ------------------------------------
  case "MENU":
    tela="GAME"; 
    break;

    // ------------------------------------
  case "TUTORIAL":
    tela="tutorial";
    break;
  }
}

// --------------------------------------------------------------------------

void tutorial() {
  background(277);
  xspeed *= 1.001;
  xpos += xspeed;
  ypos += yspeed;
  scores();
  tela = "menu";  
  background(0, 255, 0);
  trocou = true;
}


void scores() {
  fill(255);
  text(scoreE, 100, 50);
  text(scoreD, width-100, 50);
  if (xpos >640) {
    scoreE += 1;
    xspeed = xspeed*2;
    yspeed = yspeed*2;
  }
  if (xpos < 0 ) {
    scoreD += 1;
    xspeed = xspeed*1.5;
    yspeed = yspeed*1.5;
  }
}

void AI() {
  playerpos2 = xpos * easing;
}

void hold() {
  if (hold) {
    if (xpos == playerpos1) {
      xpos=xpos-8;
      //      xspeed = 0;
    }
  }
}
//
1 Like
48

what’s the error here??

1 Like
49

ah, and another error (actually my error!)

xpos=xpos-8;

do you really want to move the ball in x direction?

I gotta go

see you

Chrisir

1 Like
50

ok thank you, take care

2 Likes
51

what did you meant by where you move the paddle with the keys, should i put it somewhere in keypressed?

1 Like
52

Are you asking about the movement of the ball together with the paddle in the situation where the ball is attached to the paddle?

Then the answer is yes.

Put it in keyPressed where you move the paddle (w etc.)

But have an if clause check the situation

1 Like
53

so if(hold = true){
xpos = xpos-8
}
?

1 Like
54

i tried and it didnt held the ball while moving, when i stood still with the ball attached to the paddle it help but when i moved it i launched the ball.

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55

I think this is the if clause you are looking for

1 Like
56

This is VERY dangerous

you want either if(hold == true){ with a double ==

or just if(hold){

(but with if(hold = true){ you assign true to hold prior to evaluating it with if so it’s always true. Bad.)

1 Like
57

i tried this code and its still not working, maybe is the the xpos value?

if (hold && attachedToPaddle){
     xpos = xpos+8; 
    }
1 Like
58

did you put it in this section?

post your entire code please

gotta go

1 Like
59 
  int size = 20;    
  float xpos, ypos;    
  float xspeed = random(5, 6);
  float yspeed = random(0.6, 4);
  
  float fehler1=0;
  float fehler2=0;
  
  float playerpos1;
  float p1x;
  float playerpos2;
  float p2x;
  
  String tela;
  
  boolean trocou;
  
  int scoreE = 0;
  int scoreD = 0;
  int scoreW = 10;
  
  boolean hold=false;
  boolean attachedToPaddle=false;
  boolean move = true;
  
  float easing = 0.05;
  
  void setup() {
    size(640, 400);
    noStroke();
    tela = "MENU";
    frameRate(30);
    smooth();
    playerpos1 =height/2;
    playerpos2 =height/2;
    xpos = 45;
    ypos = playerpos1;
    p1x = 10;
    p2x = width-30;
  }
  
  void draw() {
  
    switch (tela) {
  
      // ------------------------------------
    case "GAME":
  
      background(277);
  
      if (hold && attachedToPaddle)
      {
        // ignore
      } else 
      {
        xspeed *= 1.001;
  
        xpos += xspeed;
        ypos += yspeed;
      }
  
      scores();
      hold();
  
      if (ypos > height-size/2 || ypos < 0+size/2) {
        yspeed *= -1;
      }
  
      if ( xpos <= 30+size/2) {
        if (ypos > playerpos1-50 && ypos < playerpos1+50) {
          if ( ! (hold && attachedToPaddle)) {
            xspeed *= -1;
            yspeed += (ypos-playerpos1)/5;
          }
          attachedToPaddle=true;
        }
      } else {
        attachedToPaddle=false;
      }
  
  
      if (xpos <= 0) {
        fehler1 += 1;
        if (fehler1 <= 4) {
          xpos = 50;
          ypos = playerpos1;
          xspeed = random(5, 6);
          xspeed *= -1;
          yspeed = 0; 
          println("player 2: "+ str(fehler2)+":"+str(fehler1) );
        }
        if (fehler1 ==5) {
          println("player 2 win 5:"+ str(fehler2));
        }
      }
  
      if ( xpos >= width-30-size/2) {
        if (ypos > playerpos2-50 && ypos < playerpos2+50) {
          xspeed *= -1;
          yspeed += (ypos-playerpos2)/5;
        }
      }
      if (xpos >= width) {
        fehler2 +=1 ;
        if (fehler2 <= 4) {
          xpos = width-50;
          ypos = playerpos2;
          xspeed = -random(5, 6);
          xspeed *= -1;
          yspeed = 0; 
          println("ponto: "+ str(fehler2)+":"+str(fehler1) );
        }
        if (fehler2 ==5) {
          println("player 1 ganhou 5:"+ str(fehler1));
        }
      }
  
      ellipse(xpos, ypos, size, size);
      rect (p1x, playerpos1-50, 20, 100);
      rect (p2x, playerpos2-50, 20, 100);
  
      text(str(hold), 333, 33);
  
      break; 
  
      // ------------------------------------
    case "MENU":
      menu();
      break;
  
      // ------------------------------------
    case "TUTORIAL":
      tutorial();
      break;
  
    }
  }
  
  void menu() {
    background(255, 0, 0);
    fill(0, 0, 0); 
    text ("MENU", 
      111, 111);
  }
  
  // --------------------------------------------------------------------------
  
  void keyPressed() {
  
  
    if (key == 'w') {
      if (playerpos1 >=50)
        playerpos1 = playerpos1 - 8;
    }
    if (key == 's') {
      if (playerpos1 <=height-50)
        playerpos1 = playerpos1 + 8;
    }
    if (key =='a') { 
      p1x = -8;
    }
    if (key == 'd') {
      p1x = +8;
    }
  
    // -------------------
  
    if (key == '7')
    {
      if (playerpos2 >=50)
        playerpos2 = playerpos2 - 8;
    }
    if (key == '1') {
      if (playerpos2 <=height-50)
        playerpos2 = playerpos2 + 8;
    }
    /*if (key == '3') {
     xspeed = 0;
     yspeed = 0;
     move = false;
     }
     */
    if (key == ' ') {
      hold = ! hold;
    }
  
    if (key == ESC) {
      tela="MENU";
      key=0;
    }
    if (hold && attachedToPaddle){
     xpos = xpos+8; 
    }
  }
  
  void keyReleased() {
    //hold = false;
    //attachedToPaddle=false;
  }
  
  void mousePressed() {
  
    switch (tela) {
  
      // ------------------------------------
    case "GAME":
      break; 
  
      // ------------------------------------
    case "MENU":
      tela="GAME"; 
      break;
  
      // ------------------------------------
    case "TUTORIAL":
      tela="tutorial";
      break;
    }
  }
  
  // --------------------------------------------------------------------------
  
  void tutorial() {
    background(277);
    xspeed *= 1.001;
    xpos += xspeed;
    ypos += yspeed;
    scores();
    tela = "menu";  
    background(0, 255, 0);
    trocou = true;
  }
  
  
  void scores() {
    fill(255);
    text(scoreE, 100, 50);
    text(scoreD, width-100, 50);
    if (xpos >640) {
      scoreE += 1;
      xspeed = xspeed*2;
      yspeed = yspeed*2;
    }
    if (xpos < 0 ) {
      scoreD += 1;
      xspeed = xspeed*1.5;
      yspeed = yspeed*1.5;
    }
  }
  
  void AI() {
    playerpos2 = xpos * easing;
  }
  
  void hold() {
    if (hold) {
      if (xpos == playerpos1) {
        xpos=xpos-8;
        //      xspeed = 0;
      }
    }
  }
  //
1 Like
60

??

the idea is that we move the ball together with the paddle when the ball is attached.

WHERE do we move the paddle in keyPressed??

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