CubeOfPoints.pde

// Zoom and pan a cube of 3D points

// Scale
float zoom;
// offset from center
PVector offset;
// previous offset
PVector poffset;
// mouse position
PVector mouse;

void setup() {
  size(1200, 1200, P3D);
  //smooth(4);
  frameRate(60);
  //hint(DISABLE_OPTIMIZED_STROKE);
  //colorMode(HSB, 360, 360, 360);
  offset = new PVector(0, 0);
  poffset = new PVector(0, 0);
  zoom = 10.0;
}

void draw() {
  background(0);
  pushMatrix();
  translate(width/2, height/2);
  scale(zoom);
  translate(offset.x/zoom, offset.y/zoom);
  // Draw everything relative to center and scale for 2D "zoom"
  // Offset and scale to zoom
  // Now for the circles!
  //drawCircles(width/2, height/2, 2400);
  drawPoints();
  popMatrix();
  //saveFrame("frames/cir-######.png");
  surface.setTitle(zoom + " zoom");
}

// Zoom in and out when the key is pressed
void keyPressed() {
  if (key == 'e') {
    zoom += 1.0;
  } else if (key == 'q') {
    zoom -= 1.0;
  }
  zoom = constrain(zoom, -100, 100);
}

// Store the mouse and the previous offset
void mousePressed() {
  mouse = new PVector(mouseX, mouseY);
  poffset.set(offset);
}

void mouseWheel(MouseEvent event) {
  float e = event.getCount();
  zoom = constrain(zoom+(e/10), -1000, 1000);
}

// Calculate the new offset based on change in mouse vs. previous offsey
void mouseDragged() {
  offset.x = mouseX - mouse.x + poffset.x;
  offset.y = mouseY - mouse.y + poffset.y;
}

void drawCircles(float x, float y, float radius) {
  stroke(255);
  strokeWeight(1);
  noFill();
  ellipse(x, y, radius, radius);
  // try adjusting radius 2...12
  if (radius > 24) {
    drawCircles(x + radius/2, y, radius/2);
    drawCircles(x - radius/2, y, radius/2);
    drawCircles(x, y + radius/2, radius/2);
    // uncomment for added fun
    drawCircles(x, y - radius/2, radius/2);
  }
}

void drawPoints() {
  for (int x=-20; x<20; x++) {
    for (int y=-20; y<20; y++) {
      for (int z=-20; z<20; z++) {
        stroke(255);
        strokeWeight(random(1, 5));
        point(x, y, z);
      }
    }
  }
}

void sphere() {
  lights();
  translate(offset.x, offset.y);
  fill(255/2);
  stroke(255/2);
  sphereDetail(10);
  sphere(100);
}