How do I make my ellipse move only horizontally if I click my mouse and if I click it again it ...

Answers

• billautomata

  October 2013

  Do you want the ball to move only if you click the mouse? If so, wrap your "movement code" inside a if(){} block that uses mousePressed as the boolean operator in the conditional statement.

  ex.

  int xPosition, yPosition; int xAdder = 3; int yAdder = 7; int r, g, b; boolean rIncreasing = true;
  
  void setup() {
  
    size(displayWidth/2, displayHeight); 
    xPosition = 200; 
  }
  
  void draw() {
  
    background(255, 0, 255);
  
    fill(r, g, b);
  
    ellipse(xPosition, yPosition, 100, 100);
  
    if(mousePressed){
      xPosition = xPosition + xAdder; 
      yPosition = yPosition + yAdder;
  
      if (xPosition > displayWidth/2) { 
        xAdder = -3; 
      } 
      if (yPosition > displayHeight) { 
        yAdder = -7; 
      }
  
      if (xPosition < 0) {    
        xAdder = 3;
      }
  
      if (yPosition < 0) {
        yAdder = 7;
      }
  
      if (rIncreasing) { r = r + 1; } else { r = r - 1; }
  
      if (r > 255) { 
        rIncreasing = false; 
      } else if (r < 0) { 
        rIncreasing = true; 
      } 
    }
  }
  
• TfGuy44

  October 2013

  int xPosition, yPosition; 
  int xAdder = 3; 
  int yAdder = 7; 
  int r, g, b; 
  boolean rIncreasing = true;
  boolean toggle = true;
  
  void setup() {
  
    size(400, 600); 
    xPosition = 200;
  }
  
  void draw() {
  
    background(255, 0, 255);
  
    fill(r, g, b);
  
    ellipse(xPosition, yPosition, 100, 100);
  
    xPosition = xPosition + xAdder; 
    if( toggle ){
      yPosition = yPosition + yAdder;
    }
  
    if (xPosition > width) { 
      xAdder = -3;
    } 
    if (yPosition > height) { 
      yAdder = -7;
    }
  
    if (xPosition < 0) {
      xAdder = 3;
    }
  
    if (yPosition < 0) {
      yAdder = 7;
    }
  
    if (rIncreasing) { 
      r = r + 1;
    } 
    else { 
      r = r - 1;
    }
  
    if (r > 255) { 
      rIncreasing = false;
    } 
    else if (r < 0) { 
      rIncreasing = true;
    }
  }
  
  void mousePressed(){
    toggle=!toggle;
  }
  
• GoToLoop

  October 2013 edited October 2013

  A simpler 1 just for comparison: :bz

  // Bumping Ellipse (v2.0)
  // by  Tonakisvn (2013/Oct)
  // mod GoToLoop
  
  // forum.processing.org/two/discussion/374/
  // how-do-i-make-my-ellipse-move-only-horizontally-
  // if-i-click-my-mouse-and-if-i-click-it-again-it-
  
  final static int W = 100, H = 75;
  
  int x, y, spx = 5, spy = 7;
  boolean isBumping = true;
  
  void setup() {
    size(400, 600);
  
    frameRate(60);
    smooth();
  
    ellipseMode(CENTER);
    strokeWeight(4);
  
    stroke(0);
    fill(0200);
  
    x = width  >> 1;
    y = height >> 1;
  }
  
  void draw() {
    background(-1);
    ellipse(x, y, W, H);
  
    if ((x += spx) < W/2 | x > width - W/2)
      spx *= -1;
  
    if ((y += isBumping? spy : 0) < H/2 | y > height - H/2)
      spy *= -1;
  }
  
  void mousePressed() {
    isBumping = !isBumping;
    fill((color) random(#000000));
  }