Nafisa Ahmed Wanderer

BouncingWithVectors/BouncingWithVectors.pde

@@ -1,37 +1,38 @@
 //declare variables
-float x, y, velX, velY, diam;
+float diam;
+PVector loc;    //declare loc, replaces x and y
+PVector vel;   //declare vel, replaces velx and vely
 
 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);
+ loc = new PVector(width/2, height/2);
+vel = PVector.random2D();  //random vector - speed of ball stays the same while direction changes 
+vel.mult(10);  //multiply vector by 10 - random direction with magnitude of 10
+diam = 80;
 }
 
 void draw() {
   //draw background to cover previous frame
   background(0);
 
   //draw ball
-  ellipse(x, y, diam, diam);
+  ellipse(loc.x, loc.y, diam, diam);      //loc.x is the x component of loc
 
-  //add velocity to position
-  x += velX;
-  y += velY;
+  //add velocity to position using vector addition - add vel vector to loc vector
+  loc.add(vel);           
 
   //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 (loc.x + diam/2 >= width) {
+    vel.x = -abs(vel.x);    //if the ball hits the right wall, assign x velocity the negative version of itself
+  } else if (loc.x - diam/2 <= 0) {
+    vel.x = abs(vel.x);     //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);
+  if (loc.y + diam/2 >= height) {
+    vel.y = -abs(vel.y);
+  } else if (loc.y - diam/2 <= 0) {
+    vel.y = abs(vel.y);
   }
+}

Wanderer/Wanderer.pde

@@ -1,37 +1,64 @@
 //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[]acc = 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);
+int i=0;
+while(i<count){
+  //initialize PVectors
+  loc[i] = new PVector(width/2, height/2);
+  vel[i] = new PVector (0,0);
+ acc[i] = PVector.random2D();
+ acc[i].mult(0.1);
+ diam[i] = 80;
+ i++;
+}
 }
 
 void draw() {
+int i=0; 
+while(i<count){
+
+  acc[i] = PVector.random2D();
+
   //draw background to cover previous frame
   background(0);
 
   //draw ball
-  ellipse(x, y, diam, diam);
+  ellipse(loc[i].x, loc[i].y, diam[i], diam[i]);
+  ellipse(mouseX, mouseY, 30, 30);
+//multiply acc by 0.1
+acc[i].mult(0.1);
+
+
+//add acc to vel
+vel[i].add(acc[i]);
+
+//magnitude of vel cannot be greater than 1
+vel[i].limit(1);
 
   //add velocity to position
-  x += velX;
-  y += velY;
+  loc[i].add(vel[i]);
 
   //wrap the ball's position
-  if (x + diam/2 >= width) {
-    x = -diam/2;     
-  } else if (x - diam/2 <= 0) {
-    x = width + diam/2;
+  if (loc[i].x >= width) {
+    loc[i].x = -loc[i].x;
+  } else if (loc[i].x <= 0) {
+    loc[i].x = -loc[i].x;
   }
-  if (y + diam/2 >= height) {
-    y = -diam/2;
-  } else if (y - diam/2 <= 0) {
-    y = height + diam/2;
+  if (loc[i].y+diam[i]/2 >= height) {
+    loc[i].y = -loc[i].y;
+  } else if (loc[i].y+diam[i]/2 <= 0) {
+    loc[i].y = -loc[i].y;
   }
+
+ i++; 
+}
+}