//turn camera
boolean td=false;
boolean tl=false;
boolean tu=false;
boolean tr=false;

//key registers
boolean w,a,s,d;

//x,y,z of the FLOOR (z is not used, but could be used if I want to implement jumping or vertical movement)
float x=0;
float y=0;
float z=0;

//location of the camera pivot
float x2=1600/2;
float y2=900/2;
//z2 is used to "zoom in" on the camera pivot
float z2=0;

//camera rotation (you can drag the mouse buttons to change the view on the camera pivot, try it)
float camRotZ,camRotX;

//floor rotation (to create the effect that the character is turning)
float frotZ,frotY;

//base speed at which the character moves
float spd=10;

void setup(){
  //p3d canvas to allow Z translations
  size(1600,900,P3D);
  background(0);
  frameRate(30);
}

void draw(){

  moveCam();
  move();

  //all the graphics
  textSize(25);
  fill(255);
  stroke(255);
  background(0);
  pushMatrix();
    //the camera is here
    translate(x2,y2,z2);
    rotateX(radians(camRotX+75));
    rotateZ(radians(camRotZ));
    pushMatrix();
      //the floor
      rotateZ(radians(frotZ));
      translate(0,0,-150);
      fill(125);
      rectMode(RADIUS);
      rect(x,y,1000,1000);
    popMatrix();
    pushMatrix();
      //the "player" (just a sphere)
      noFill();
      stroke(255);
      sphere(25);
      //player's "first person viewpoint"
      line(0,0,0,-100);
    popMatrix();
  popMatrix();
  //text to show values I was frequently using and needed to test with
  text("x: "+x+", y: "+y+", z: "+z+"\n"+"x2: "+x2+", y2: "+y2+", z2: "+z2+"\n"+"frotZ: "+frotZ+", to rad: "+radians(frotZ)+"\nsin(rad(frotZ)): "+sin(radians(frotZ)),20,40);
}

//increasing z2 to create a zooming in/out effect
void mouseWheel(MouseEvent event) {
  float e = event.getCount();
  if(e != 0) {
    if(e < 0) {
      z2+=10;
    } else if(e > 0) {
      z2-=10;
    }
  }
}

//registering keypresses for WASD
void keyPressed(){
  if(key == 'a' || key == 'A'){
    a=true;
  } else if(key == 'd' || key == 'D'){
    d=true;
  } else if(key == 'w' || key == 'W'){
    w=true;
  } else if(key == 's' || key == 'S'){
    s=true;
  }
}

//key releases for WASD
void keyReleased(){
  if(key == 'a' || key == 'A'){
    a=false;
  } else if(key == 'd' || key == 'D'){
    d=false;
  } else if(key == 'w' || key == 'W'){
    w=false;
  } else if(key == 's' || key == 'S'){
    s=false;
  }
}

//to change the POV (by dragging the mouse)
void mouseDragged(){
  if(pmouseX>mouseX){
    tl=false;
    tr=true;
  } if(pmouseX<mouseX){
    tr=false;
    tl=true;
  } if(pmouseY>mouseY){
    tu=true;
    td=false;
  } if(pmouseY<mouseY){
    td=true;
    tu=false;
  }
}

void mouseReleased(){
  tr=false;
  tl=false;
  tu=false;
  td=false;
}

//separate function to allow for multiple directions to change at once
//i couldnt make it work with the mouseDragged() function alone
void moveCam(){
  if(tl){
    camRotZ+=(pmouseX-mouseX)/8;
  } else if(tr) {
    camRotZ-=(mouseX-pmouseX)/8;
  }
  if(td){
    camRotX+=(pmouseY-mouseY)/8;
  } else if(tu){
    camRotX-=(mouseY-pmouseY)/8;
  }
}

//movement of the "player"
//the floor is the thing that actually moves
//this is where I am stuck, at the moment
//it can only "rotate the floor" to create
//the effect that the player is turning
//left or right.

void move(){
  if(a){
    if(frotZ+1>360){
      frotZ=0;
    }
    frotZ+=1;
  } if(d){
    if(frotZ-1<0){
      frotZ=360;
    }
    frotZ-=1;
  }
}