master

GravityBallCode/GravityBallCode.pde

@@ -1,38 +1,47 @@
 //declare variables
-float x, y, velX, velY, diam;
 
+int count = 30; // sets count
+float [] x  = new float[count];
+float [] y = new float[count];
+float [] velx = new float[count];
+float [] vely = new float[count];
+float [] diam = new float[count];
+float [] gravity = new float[count]; //defines variables 
 void setup() {
-  //set size of canvas
-  size(800, 600);
+
+  size(800, 600);  //set size of canvas
 
-  //initialize variables
-  x = width/2;
-  y = height/2;
-  diam = 80;
-  velX = random(-5, 5);
-  velY = random(-5, 5);
+  for (int i = 0; i < count; i++) { 
+    //initialize variables
+    x [i]  = width/2;
+    y [i] = height/2;
+    diam [i] = 50;
+    velx [i] = random(3, 7);
+    vely [i] = random(3, 15);
+    gravity [i] = .5; //sets speed of acceleration
+  }
 }
 
 void draw() {
   //draw background to cover previous frame
   background(0);
+  for (int i = 0; i < count; i++) {
+    vely [i] += gravity [i]; //adds gravity to accelaration
 
-  //draw ball
-  ellipse(x, y, diam, diam);
-
-  //add velocity to position
-  x += velX;
-  y += velY;
+    //draw ball
+    x [i] += velx [i] ;
+    y [i] += vely [i] ;
+    ellipse(x [i], y [i], diam [i], diam [i]);
 
-  //bounce ball if it hits walls
-  if (x + diam/2 >= width) {
-    velX = -abs(velX);    //if the ball hits the right wall, assign x velocity the negative version of itself
-  } else if (x - diam/2 <= 0) {
-    velX = abs(velX);     //if the ball hits the left wall, assign x velocity the positive version of itself
-  }
-  if (y + diam/2 >= height) {
-    velY = -abs(velY);
-  } else if (y - diam/2 <= 0) {
-    velY = abs(velY);
+    //bounce ball if it hits walls
+    if (x [i] + diam [i]/2 >= width) {
+      velx [i] = -abs(velx [i]);    //if the ball hits the right wall, assign x [i] velocity [i] the negative version of itself
+    } else if (x [i] - diam [i]/2 <= 0) {
+      velx [i] = abs(velx [i]);     //if the ball hits the left wall, assign x [i] velocity [i] the positive version of itself
+    }
+    if (y [i] + diam [i]/2 >= height) { //if ball hits bottom wall, reverse
+      vely [i] = -abs(vely [i]);
+      y [i] = height - diam[i]/2 ;
+    }
   }
 }