Basic processing sketch to simulate a 3D environment, simple interactivity with mouse

gridvector.pde

//grid of arrows directed by mouse
//Kawandeep Virdee

//interesting things happen when you change the direction of the 
// vector that is the difference between the mouse and the point. 


PVector[][] grid;
int width=400;
int height=500;
int resolution = 20;
int rows = height/resolution;
int cols = width/resolution;



void setup() {
  colorMode(HSB, 255);
  size(width,height);
  smooth();
  grid = new PVector[cols][rows];
  for (int i = 0; i < cols; i ++ ) {
    for (int j = 0; j < rows; j ++ ) {
      // Initialize each object
      grid[i][j] = new PVector(i*(resolution),j*(resolution));
    }
  }

}

void draw() {
  background(255);
  
  PVector mouseLoc = new PVector(mouseX,mouseY);
  
  for (int i = 0; i < cols; i ++ ) {     
    for (int j = 0; j < rows; j ++ ) {
      // Oscillate and display each object
      
      // make it grid - mouse to see like 3D
      //make it mouse - grid to have all vectors point to mouse
      PVector v = PVector.sub(grid[i][j], mouseLoc);
      color arrowColor = color((random(255)), 255, 0, 100);
      drawVector(v,grid[i][j],0.1f, arrowColor);
    }
  }
  
  
  
  

}

void drawVector(PVector v, PVector loc, float scayl, color arrowcolor) {
  pushMatrix();
  float arrowsize = 1;
  translate(loc.x,loc.y);
  stroke(arrowcolor);
  strokeWeight(2);
  rotate(v.heading2D());
  float len = v.mag()*scayl;
  line(0,0,len,0);
  line(len,0,len-arrowsize,+arrowsize/2);
  line(len,0,len-arrowsize,-arrowsize/2);
  popMatrix();
}

void mousePressed(){
  saveFrame();
}