From 99d8b9c9d044ab36de386fe95c374b6f2404efcc Mon Sep 17 00:00:00 2001
From: shivani517 <ssrivastava@ucvts.tec.nj.us>
Date: Fri, 13 Nov 2015 12:15:56 -0500
Subject: [PATCH] Multiple Balls have gravity

---
 GravityBallCode/GravityBallCode.pde | 67 ++++++++++++++++++-----------
 1 file changed, 41 insertions(+), 26 deletions(-)

diff --git a/GravityBallCode/GravityBallCode.pde b/GravityBallCode/GravityBallCode.pde
index df2493b..37f525c 100644
--- a/GravityBallCode/GravityBallCode.pde
+++ b/GravityBallCode/GravityBallCode.pde
@@ -1,38 +1,53 @@
 //declare variables
-float x, y, velX, velY, diam;
-
+float[] x= new float [30];
+float[] y= new float [30];
+float[] velX= new float [30];
+float[] velY= new float [30] ;
+float diam; 
+float a;
 void setup() {
   //set size of canvas
   size(800, 600);
-
-  //initialize variables
-  x = width/2;
-  y = height/2;
-  diam = 80;
-  velX = random(-5, 5);
-  velY = random(-5, 5);
+  for (int i=0; i<30; i++) { 
+    //initialize variables
+    x[i] = random(450);
+    y[i] = random(100);
+    diam = 30;
+    velX[i] =5;
+    velY[i] = 5;
+    a=1;
+  }
 }
 
 void draw() {
   //draw background to cover previous frame
-  background(0);
+  background(255);
+  for (int i=0; i<30; i++) { 
 
-  //draw ball
-  ellipse(x, y, diam, diam);
+    //draw ball
+    fill(255, 204, 255);
+    ellipse(x[i], y[i], diam, diam);
+    velY[i] += a;
+    //add velocity to position
+    x[i] += velX[i];
+    y[i] += velY[i];
 
-  //add velocity to position
-  x += velX;
-  y += velY;
-
-  //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/2 >= width) {
+      velX[i] = -abs(velX[i]);    //if the ball hits the right wall, assign x velocity the negative version of itself
+    } else if (x[i] - diam/2 <= 0) {
+      velX[i] = abs(velX[i]);     //if the ball hits the left wall, assign x velocity the positive version of itself
+    }
+    if (y[i] + diam/2 >= height) {
+      y[i]=height- diam/2;
+      velY[i] = -abs(velY[i]);
+    } else if (y[i] - diam/2 <= 0) {
+      velY[i] = abs(velY[i]);
+    }
+    if (dist(x[i], y[i], mouseX, mouseY) <= diam/2 && height>= 0) {
+      fill(210, 217, 255);
+      velX[i]= -abs(velX[i]);
+      velY[i]= -abs(velY[i]);
+    }
   }
 }
\ No newline at end of file