Interpolar quadrado

float i = 0;
float xI = 150;
float yI = 150;
float xF;
float yF;
float varX;
float varY;
boolean movendo = false;

void setup(){
  size(300,300);
}

void draw(){
  background(0);
  if(movendo){
    move(xI, yI, xF, yF, 20);
  }else{
    rect(xI, yI, 10,10);
  }
}

void move(float xI, float yI, float xF, float yF, int v){

  if(xI > xF){
    varX = -(xI - xF);
  }else{
    varX = abs(xI - xF);
  }

  if(yI > yF){
    varY = -(yI - yF);
  }else{
    varY = abs(yI - yF);
  }

  if( i <= 1){
    rect(xI + varX* i, yI + varY*i, 10,10);
    i += 1.0/v;
  }else{
    this.xI +=  varX * i;
    this.yI += varY * i;
    i = 0;
    movendo = false;
  }
}

void mouseReleased(){
  xF = mouseX;
  yF = mouseY;
  movendo = true;
}