jgannon_GravityBalls

GravityBallCode/GravityBallCode.pde

@@ -1,38 +1,60 @@
 //declare variables
-float x, y, velX, velY, diam;
+int count=30;
 
+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 [] grav = 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);
+    grav[i] = .2;
+  }
 }
-
 void draw() {
   //draw background to cover previous frame
   background(0);
 
   //draw ball
-  ellipse(x, y, diam, diam);
+  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];
+    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]);
+    }
   }
 }