falling balls

michyg

so i need to do a project. i need to make balls fall like rain and every ball needs to have a different color. And when they tuch the ground they need to bounce off and then faid of . Can anybody help me???

michyg

the balls have to be big at first and when they fall get smaller

Chrisir

Sure

Make a class Ball and an array of it (before setup ())

See tutorial objects

Then fill the array in setup

Move and display array in draw

See examples on movement and gravity

For fade see opacity in command fill

Then show your entire code and tell us what you have problems with

Chrisir

michyg

ArrayList balls; float a;

void setup(){ size(600,600); balls = new ArrayList(); } void draw() { background(230,230,250); balls.add(new Ball()); for (Ball balls:balls){ balls.fall(); balls.display(); } } class Ball {

 float x=random(width);
float y=random(-200,100);
 float yspeed=random(3,4);
 float a=random(40);

 void fall(){
   if (y<height) {
   y+=yspeed;  
   } 

} void display(){ fill(255); noStroke(); ellipse(x,y,a,a);} }

Chrisir

Edit your post

Format your code better

Chrisir

Not bad at all!

Now add the things I told you

michyg

how ??

Chrisir

Look at the examples...

Chrisir

https://processing.org/examples/bouncybubbles.html

Here see function move()

michyg

how do you make it become smaller and smaller ?

Chrisir

You can have a fade or radius variable inside the class

Now use the radius variable with ellipse() command

Let’s make it a float variable radius = 7 : float radius = 7;

After ellipse(...) say radius = radius - 0.3; or even smaller

When radius <= 0 you could mark the ball as dead using a boolean variable isDead = true; inside the class

michyg

class Drop { float x = random(width); float y = random(-500, -50); float yspeed = random (1, 6); float radius = 7; boolean bDead; void fall() { y = y + yspeed; //yspeed = yspeed + 0.05;

if(y > height) { y = random(-200.-100);

} } void show() { stroke(255); ellipse( x, y, 20, 20); radius = radius - 0.05; if(radius <= 0) { bDead =true; println("dead"); } } }

michyg

its not making the balls smaller . why?

Chrisir

you still don't use radius in ellipse()......

koogs

please don't post duplicates.

https://forum.processing.org/two/discussion/26908/how-to-change-balls-that-are-falling-from-big-to-a-smaller-size-gradually