java - Rotating a PVector -

ok guys want rotate pvector have in method. method replaces posx , posy x , y of pvector. movement determinated joystick comes arduino moves image in x , y turn vector depending on axis joystick looking

public void moverpjuno(pvector coordenadas) {  if(areaxad==-1 && areaxat==-1){  mipersonaje.setposx((mipersonaje.getposx())+(int)coordenadas.x);  }  if(areayab==-1 && areayar==-1){  mipersonaje.setposy((mipersonaje.getposy())+(int)coordenadas.y);  }  } 

i don't have arduino hooked , don't know kind of information joystick giving you, made processing example uses mouse imitate joystick:

int rad = 100;  void setup() {   size(400, 400); }  void draw() {   background(255);   ellipse(width/2, height/2, rad*2, rad*2);    // using mouse mimic position of joystick   float theta = atan2(mousey-height/2, mousex-width/2);    // new position   float x = width/2+cos(theta)*rad;   float y = height/2+sin(theta)*rad;    // show new position   ellipse(x, y, 30, 30); } 

the atan2 function gives angle mouse position, replace arguments equivalent of joystick position. smaller ellipse being drawn shows mipersonaje set based on x , y earlier in code. rad variable arbitrary , displaying purposes, can set whatever want (if needed @ all).