Question

Consider the following Processing program that draws a circle which travels from top to bottom and finally disappears from the screen.

int y = 10;
void setup() {
  size(480, 270);
}
void draw() {
  background(255);
  stroke(0);
  fill(175);
  ellipse(width/2, y, 20, 20);
  y++;
}

Question) Modify the above program so that the circle (with a black fill) bounces back on reaching the 3/4th of the height of the screen and keeps on performing the same behavior (i.e., from top to 3/4th of the height of the screen and back to the top and so on).

Can you Please use "processing programming" to code it.

Answer 1

MODIFIED PROCESSING CODE:

int y = 10;

// This will be true when the ball has to go to the top otherwise false

boolean goToTop = false;

void setup(){

   size(480, 270);

}

void draw(){

   background(255);

   stroke(0);

   fill(0);

   ellipse(width/2, y, 20, 20);

   // If y position of the ball goes beyond 3/4th of the height of the screen

   if(y >= 3*height/4){

     // Make the ball go to the top

     goToTop = true;

   }

   // If the ball comes to the top of the screen

   if(y <= 10){

     // Make the ball go to the 3/4th height of the screen

     goToTop = false;

   }

   if(goToTop){

     y--;

   }

   else{     

     y++;

   }

}

SAMPLE OUTPUT:

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