I have this bouncing ball sketch, it normally bounces one way to the other at the same speed, but as i like things not so uniform and more random i told it that when it bounces from one side it should bounce a bit faster ( just one pixel faster)

the probelm is there is a point when the ball just goes out of screen , is there a way to keep it bouncing, whitout it going out of scrren ?

It actually does some strange bouncing before going out of screen, do you know why ?


here's the code:

Code:

/*Bouncing ball
*/


//Declare global variables
int xspeed, yspeed;
int xpos,ypos,wdth,ht;

//inicializar sketch

void setup(){
  
  //set sketch window and background color
  
  size(800,300);
  background(#FA005C);
  smooth();
  
  //ball speed
  
  xspeed = 8;
  yspeed = 8;
  
  
  // ball size
  
  
 wdth = 10;
 ht = 10;
 
 noStroke();
 
 //initial ball placement
 
 xpos = width/2;
 ypos = height/2;
 
 frameRate(60);
} 

//begin animation draw

void draw (){
  
  //update background
 
background (#FA005C);
  
  // draw ball
    ellipse ( xpos,ypos,wdth,ht);
    
    //upgrade ball position
    
    xpos+=xspeed+1;
    ypos+=yspeed;
    
    /*detects ball collition with sketch window edges also accounts for thickness of the ball
    */
    
    if ( xpos>width-wdth || xpos<=wdth){
       xspeed*=-1;
       }
         if (ypos>=height-ht || ypos<=ht){
           yspeed*=-1;
           }
            
            //saveFrame("filename-####.png"); 
           }
 

try using the constrain method to limit your maximum speed.

constrain(value, min, max)

you should probably constrain the speed to  less than 1/2 of the screen width. if the speed gets over 1/2 of the screen width that is how you get the wierd bouncing.( example: the speed of the ball is 10 pixels over half the screen width. if the ball goes 1 pixel over the right edge it jumps to 9 pixels left of center. the next jump is 20 pixels off the screen so the next iteration is10 pixels from the middle of the screen etc. so you will see the ball just jumping around the middle of the screen for a while. by limiting the max speed this won't happen because you will always need at least 2 jumps on the screen but there are instances where it could cause a problem. if so just lower the max constrained value until you no longer see a problem