EWang_Wanderer

BouncingWithVectors/BouncingWithVectors.pde

@@ -1,37 +1,42 @@
 //declare variables
-float x, y, velX, velY, diam;
+float diam;
+
+
+PVector loc; //declare loc (x & y)
+PVector vel; //declare vel (velX & 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);
+  size(800, 600, P3D);
+
+
+  //initialize vectors : constructor
+  loc = new PVector (width/2, height/2);
+  vel = PVector.random2D();
+  vel.mult(10);
+  diam = 100;
+
 }
 
 void draw() {
   //draw background to cover previous frame
   background(0);
-
+  
   //draw ball
-  ellipse(x, y, diam, diam);
+  ellipse(loc.x, loc.y, diam, diam);
 
   //add velocity to position
-  x += velX;
-  y += velY;
+  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 +1,51 @@
 //declare variables
-float x, y, velX, velY, diam;
+int diam = 50;
+int count = 50;
+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);
+  for (int i = 0; i < count; i++) {
+    loc[i] = new PVector (width/2, height/2);
+    vel[i] = new PVector (0, 0);
+    acc[i] = PVector.random2D();
+    acc[i].mult(.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++) {
+    //draw ball
+    fill(0,0,0, 30);
+    stroke(255);
+    ellipse(loc[i].x, loc[i].y, diam, diam);
 
-  //add velocity to position
-  x += velX;
-  y += velY;
+    //add velocity, accel
+    acc[i] = PVector.random2D();
+    acc[i].mult(.5);
+    vel[i].limit(3);
 
-  //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;
+    //draw background to cover previous frame
+
+    //add velocity to position
+    loc[i].add(vel[i]);
+    vel[i].add(acc[i]);
+
+    //wrap the ball's position
+    if (loc[i].x >= width) {
+      loc[i].x = 0;    //if the ball hits the right wall, assign x velocity the negative version of itself
+    } else if (loc[i].x <= 0) {
+      loc[i].x = width;     //if the ball hits the left wall, assign x velocity the positive version of itself
+    }
+    if (loc[i].y >= height) {
+      loc[i].y = 0;
+    } else if (loc[i].y <= 0) {
+      loc[i].y = height;
+    }
   }
+}