reworked Cubes example with OOP and PVector

java/examples/Topics/Motion/CubesWithinCube/Cube.pde

@@ -1,72 +1,114 @@
 
 // Custom Cube Class
 
-class Cube{
+class Cube {
+  // Position, velocity vectors
+  PVector position;
+  PVector velocity;
+  // Also using PVector to hold rotation values for 3 axes
+  PVector rotation;
+
+  // Vertices of the cube
   PVector[] vertices = new PVector[24];
+  // width, height, depth
   float w, h, d;
 
-  // Default constructor
-  Cube(){ }
+  // colors for faces of cube
+  color[] quadBG = new color[6];
 
-  // Constructor 2
   Cube(float w, float h, float d) {
     this.w = w;
     this.h = h;
     this.d = d;
+    
+    // Colors are hardcoded
+    quadBG[0] = color(0);
+    quadBG[1] = color(51);
+    quadBG[2] = color(102);
+    quadBG[3] = color(153);
+    quadBG[4] = color(204);
+    quadBG[5] = color(255);
+   
+    // Start in center
+    position = new PVector();
+    // Random velocity vector
+    velocity = PVector.random3D();
+    // Random rotation
+    rotation = new PVector(random(40, 100), random(40, 100), random(40, 100));
 
     // cube composed of 6 quads
     //front
-    vertices[0] = new PVector(-w/2,-h/2,d/2);
-    vertices[1] = new PVector(w/2,-h/2,d/2);
-    vertices[2] = new PVector(w/2,h/2,d/2);
-    vertices[3] = new PVector(-w/2,h/2,d/2);
+    vertices[0] = new PVector(-w/2, -h/2, d/2);
+    vertices[1] = new PVector(w/2, -h/2, d/2);
+    vertices[2] = new PVector(w/2, h/2, d/2);
+    vertices[3] = new PVector(-w/2, h/2, d/2);
     //left
-    vertices[4] = new PVector(-w/2,-h/2,d/2);
-    vertices[5] = new PVector(-w/2,-h/2,-d/2);
-    vertices[6] = new PVector(-w/2,h/2,-d/2);
-    vertices[7] = new PVector(-w/2,h/2,d/2);
+    vertices[4] = new PVector(-w/2, -h/2, d/2);
+    vertices[5] = new PVector(-w/2, -h/2, -d/2);
+    vertices[6] = new PVector(-w/2, h/2, -d/2);
+    vertices[7] = new PVector(-w/2, h/2, d/2);
     //right
-    vertices[8] = new PVector(w/2,-h/2,d/2);
-    vertices[9] = new PVector(w/2,-h/2,-d/2);
-    vertices[10] = new PVector(w/2,h/2,-d/2);
-    vertices[11] = new PVector(w/2,h/2,d/2);
+    vertices[8] = new PVector(w/2, -h/2, d/2);
+    vertices[9] = new PVector(w/2, -h/2, -d/2);
+    vertices[10] = new PVector(w/2, h/2, -d/2);
+    vertices[11] = new PVector(w/2, h/2, d/2);
     //back
-    vertices[12] = new PVector(-w/2,-h/2,-d/2); 
-    vertices[13] = new PVector(w/2,-h/2,-d/2);
-    vertices[14] = new PVector(w/2,h/2,-d/2);
-    vertices[15] = new PVector(-w/2,h/2,-d/2);
+    vertices[12] = new PVector(-w/2, -h/2, -d/2); 
+    vertices[13] = new PVector(w/2, -h/2, -d/2);
+    vertices[14] = new PVector(w/2, h/2, -d/2);
+    vertices[15] = new PVector(-w/2, h/2, -d/2);
     //top
-    vertices[16] = new PVector(-w/2,-h/2,d/2);
-    vertices[17] = new PVector(-w/2,-h/2,-d/2);
-    vertices[18] = new PVector(w/2,-h/2,-d/2);
-    vertices[19] = new PVector(w/2,-h/2,d/2);
+    vertices[16] = new PVector(-w/2, -h/2, d/2);
+    vertices[17] = new PVector(-w/2, -h/2, -d/2);
+    vertices[18] = new PVector(w/2, -h/2, -d/2);
+    vertices[19] = new PVector(w/2, -h/2, d/2);
     //bottom
-    vertices[20] = new PVector(-w/2,h/2,d/2);
-    vertices[21] = new PVector(-w/2,h/2,-d/2);
-    vertices[22] = new PVector(w/2,h/2,-d/2);
-    vertices[23] = new PVector(w/2,h/2,d/2);
-  }
-  void create(){
+    vertices[20] = new PVector(-w/2, h/2, d/2);
+    vertices[21] = new PVector(-w/2, h/2, -d/2);
+    vertices[22] = new PVector(w/2, h/2, -d/2);
+    vertices[23] = new PVector(w/2, h/2, d/2);
+  } 
+
+  // Cube shape itself
+  void drawCube() {
     // Draw cube
-    for (int i=0; i<6; i++){
-      beginShape(QUADS);
-      for (int j=0; j<4; j++){
-        vertex(vertices[j+4*i].x, vertices[j+4*i].y, vertices[j+4*i].z);
-      }
-      endShape();
-    }
-  }
-  void create(color[]quadBG){
-    // Draw cube
-    for (int i=0; i<6; i++){
+    for (int i=0; i<6; i++) {
       fill(quadBG[i]);
       beginShape(QUADS);
-      for (int j=0; j<4; j++){
+      for (int j=0; j<4; j++) {
         vertex(vertices[j+4*i].x, vertices[j+4*i].y, vertices[j+4*i].z);
       }
       endShape();
     }
   }
+  
+  // Update location
+  void update() {
+    position.add(velocity);
+
+    // Check wall collisions
+    if (position.x > bounds/2 || position.x < -bounds/2) {
+      velocity.x*=-1;
+    }
+    if (position.y > bounds/2 || position.y < -bounds/2) {
+      velocity.y*=-1;
+    }
+    if (position.z > bounds/2 || position.z < -bounds/2) {
+      velocity.z*=-1;
+    }
+  }
+
+  
+  // Display method
+  void display() {
+    pushMatrix();
+    translate(position.x, position.y, position.z);
+    rotateX(frameCount*PI/rotation.x);
+    rotateY(frameCount*PI/rotation.y);
+    rotateZ(frameCount*PI/rotation.z);
+    noStroke();
+    drawCube(); // Farm out shape to another method
+    popMatrix();
+  }
 }
 
-