From 99b03aa85b34695f5f45a8f876836501093a4bf2 Mon Sep 17 00:00:00 2001
From: jessgannon13 <jgannon@ucvts.tec.nj.us>
Date: Thu, 12 Nov 2015 11:49:48 -0500
Subject: [PATCH 1/3] create arrays

---
 GravityBallCode/GravityBallCode.pde | 61 +++++++++++++++++++----------
 1 file changed, 40 insertions(+), 21 deletions(-)

diff --git a/GravityBallCode/GravityBallCode.pde b/GravityBallCode/GravityBallCode.pde
index df2493b..f593b9a 100644
--- a/GravityBallCode/GravityBallCode.pde
+++ b/GravityBallCode/GravityBallCode.pde
@@ -1,38 +1,57 @@
 //declare variables
-float x, y, velX, velY, diam;
+int count=450;
 
+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];
 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 < count; i++) {
+    x[i] = width/2;
+    y[i] = height/2;
+    diam[i] = random(50);
+    velx[i] = random(-5, 5);
+    velY[i] = random(-5, 5);
+  }
 }
-
 void draw() {
   //draw background to cover previous frame
   background(0);
 
   //draw ball
-  ellipse(x, y, diam, diam);
+  for (int i=0; i <count; i++) {
+    fill(random(255), random(255), random(255));
+    ellipse(x[i], y[i], diam[i], diam[i]);
+    //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[i]/2 >= width) {
+      velx[i] = -abs(velx[i]);    //if the ball hits the right wall, assign x[0] velocity 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[0] velocity the positive version of itself
+    }
+    if (y[i] + diam[i]/2 >= height) {
+      velY[i] = -abs(velY[i]);
+    } else if (y[i] - diam[i]/2 <= 0) {
+      velY[i] = abs(velY[i]);
+    }
+    if (x[i] + diam[i] >= width) {
+      velx[i] = -abs(velx[i]);    //if the ball hits the right wall, assign x[0] velocity the negative version of itself
+    } else if (x[i] - diam[i] <= 0) {
+      velx[i] = abs(velx[i]);     //if the ball hits the left wall, assign x[0] velocity the positive version of itself
+    }
+    if (y[i]+ diam[i] >= height) {
+      velY[i] = -abs(velY[i]);
+    } else if (y[i] - diam[i] <= 0) {
+      velY[i] = abs(velY[i]);
+    }
   }
 }
\ No newline at end of file

From 28b4b94f27f2eeacfaf85fffa4aac154c5846ab5 Mon Sep 17 00:00:00 2001
From: jessgannon13 <jgannon@ucvts.tec.nj.us>
Date: Thu, 12 Nov 2015 13:31:42 -0500
Subject: [PATCH 2/3] changed to 30 balls

---
 GravityBallCode/GravityBallCode.pde | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/GravityBallCode/GravityBallCode.pde b/GravityBallCode/GravityBallCode.pde
index f593b9a..a1f8ecb 100644
--- a/GravityBallCode/GravityBallCode.pde
+++ b/GravityBallCode/GravityBallCode.pde
@@ -1,5 +1,5 @@
 //declare variables
-int count=450;
+int count=30;
 
 float [] x = new float [count];
 float [] y = new float [count];
@@ -14,7 +14,7 @@ void setup() {
   for (int i=0; i < count; i++) {
     x[i] = width/2;
     y[i] = height/2;
-    diam[i] = random(50);
+    diam[i] = 50;
     velx[i] = random(-5, 5);
     velY[i] = random(-5, 5);
   }
@@ -25,7 +25,6 @@ void draw() {
 
   //draw ball
   for (int i=0; i <count; i++) {
-    fill(random(255), random(255), random(255));
     ellipse(x[i], y[i], diam[i], diam[i]);
     //add velocity to position
     x[i] += velx[i];

From 286c17a976c41cd5fc5301350771c0c5a959c7ab Mon Sep 17 00:00:00 2001
From: jessgannon13 <jgannon@ucvts.tec.nj.us>
Date: Thu, 12 Nov 2015 13:35:30 -0500
Subject: [PATCH 3/3] added gravity variable (acceleration)

---
 GravityBallCode/GravityBallCode.pde | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/GravityBallCode/GravityBallCode.pde b/GravityBallCode/GravityBallCode.pde
index a1f8ecb..a9d2908 100644
--- a/GravityBallCode/GravityBallCode.pde
+++ b/GravityBallCode/GravityBallCode.pde
@@ -6,6 +6,7 @@ float [] y = new float [count];
 float [] velx = new float [count];
 float [] velY = new float [count];
 float [] diam = new float [count];
+float [] grav = new float [count];
 void setup() {
   //set size of canvas
   size(800, 600);
@@ -14,9 +15,10 @@ void setup() {
   for (int i=0; i < count; i++) {
     x[i] = width/2;
     y[i] = height/2;
-    diam[i] = 50;
+    diam[i] = random(50);
     velx[i] = random(-5, 5);
     velY[i] = random(-5, 5);
+    grav[i] = .2;
   }
 }
 void draw() {
@@ -25,6 +27,8 @@ void draw() {
 
   //draw ball
   for (int i=0; i <count; i++) {
+    velY[i] += grav[i];
+    fill(random(250),random(250),random(250));
     ellipse(x[i], y[i], diam[i], diam[i]);
     //add velocity to position
     x[i] += velx[i];