Master

BouncingWithVectors/BouncingWithVectors.pde

@@ -1,37 +1,45 @@
 //declare variables
-float x, y, velX, velY, diam;
+int count = 30;
+float[] diam = new float[count];
+PVector[] loc = new PVector[count];
+PVector[] vel = new PVector[count];
+PVector[] gravity = new PVector[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++) {
+    loc[i] = new PVector(width/2, height/2);
+    diam[i] = random(5,30);
+    vel[i] = new PVector(random(-2,2),random(-2,2));
+    vel[i].mult(5);
+    gravity[i] = new PVector(0,1);
+  }
 }
 
 void draw() {
-  //draw background to cover previous frame
   background(0);
+  for (int i = 0; i < count; i++) {
+    //draw ball
+    fill(random(255),random(255),random(255));
+    ellipse(loc[i].x, loc[i].y, diam[i], diam[i]);
 
-  //draw ball
-  ellipse(x, y, diam, diam);
+    //add velocity to position
+    //loc.x += vel.x;
+    //loc.y += vel.y;
+    vel[i].add(gravity[i]);
+    loc[i].add(vel[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 (loc[i].x + diam[i]/2 >= width) {
+      vel[i].x = -abs(vel[i].x);
+    } else if (loc[i].x - diam[i]/2 <= 0) {
+      vel[i].x = abs(vel[i].x);
+    }
+    if (loc[i].y + diam[i]/2 >= height) {
+      vel[i].y = -abs(vel[i].y);
+    } else if (loc[i].y - diam[i]/2 <= 0) {
+      vel[i].y = abs(vel[i].y);
+    }
   }
+}

Wanderer/Wanderer.pde

@@ -1,37 +1,48 @@
 //declare variables
-float x, y, velX, velY, diam;
+int count = 30;
+float[] diam = new float[count];
+PVector[] loc = new PVector[count];
+PVector[] vel = new PVector[count];
+PVector[] a = new PVector[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 q = 0; q < count; q++) {
+    background(0);
+    //initialize variables
+    loc[q] = new PVector(width/2, height/2);
+    diam[q] = 10;
+    vel[q] = new PVector(0, 0);
+    a[q] = PVector.random2D();
+    a[q].mult(.1);
+  }
 }
 
 void draw() {
   //draw background to cover previous frame
-  background(0);
 
   //draw ball
-  ellipse(x, y, diam, diam);
+  for (int q = 0; q < count; q++) {
+    fill(0,random(255),0);
+    ellipse(loc[q].x, loc[q].y, diam[q], diam[q]);
+    a[q] = PVector.random2D();
+    a[q].mult(.1);
+    //add velocity to position
+    vel[q].add(a[q]);
+    loc[q].add(vel[q]);
+    vel[q].limit(10);
 
-  //add velocity to position
-  x += velX;
-  y += velY;
-
-  //wrap the ball's position
-  if (x + diam/2 >= width) {
-    x = -diam/2;     
-  } else if (x - diam/2 <= 0) {
-    x = width + diam/2;
-  }
-  if (y + diam/2 >= height) {
-    y = -diam/2;
-  } else if (y - diam/2 <= 0) {
-    y = height + diam/2;
+    //wrap the ball's position
+    if (loc[q].x >= width) {
+      loc[q].x = 0;
+    } else if (loc[q].x <= 0) {
+      loc[q].x = width;
+    }
+    if (loc[q].y >= height) {
+      loc[q].y = 0;
+    } else if (loc[q].y <= 0) {
+      loc[q].y = height;
+    }
   }
+}