boolean ciz = false;
boolean sil = false;
color[] palet = {
  #ffffff, #ffcc00, #00ffcc, #ff00cc, #cccccc
};

float hiz = 0;
boolean yatay;
int curX, curY;
boolean yapistimi = false;

//------------------//
void setup() {
  size(800, 800);
  background(0);
  stroke(255);
  frameRate(160);
}
//------------------//


//---------------------------------------------------------------------//

void draw() {
  hiz =   sqrt (  pow(pmouseX-mouseX, 2)+ pow(pmouseY-mouseY, 2) );
  float yavas = hiz/5;
  float limitli = constrain(yavas, 1, 10);

//---------------------------------------------------------------------//

  if (ciz) {

    strokeWeight(limitli);
    stroke(seciliRenk);

    if (yapistir) {
      if (!yapistimi) {
        curX = mouseX;
        curY = mouseY;
        yapistimi = true;


        float aci = abs(degrees(atan2(pmouseY-mouseY, pmouseX-mouseX )));
        if (aci > 45 && aci < 135 ) {
          yatay = false;
        } else {

          yatay = true;
        }
      }

      if (yatay) {
        line(mouseX, curY, pmouseX, curY);
      } else {
        line(curX, mouseY, curX, pmouseY);
      }
    } else {

      line(mouseX, mouseY, pmouseX, pmouseY);
    }
  } else if (sil) {
    strokeWeight(limitli*10);
    stroke(0);
    line(mouseX, mouseY, pmouseX, pmouseY);
  }
}


void mousePressed() {

  if (mouseButton == LEFT) {
    ciz = true;
  } else if (mouseButton == RIGHT) {
    sil = true;
  } else {
  }
}




void mouseReleased() {

  if (ciz) {
    ciz = false;
  }

  if (sil) {
    sil = false;
  }
}


boolean yapistir = false;

color seciliRenk;
void keyPressed() {
  if (keyCode == 49) {
    seciliRenk = palet[0];
  }

  if (keyCode == 50) {
    seciliRenk = palet[1];
  }
  if (keyCode == 51) {
    seciliRenk = palet[2];
  }
  if (keyCode == 52) {
    seciliRenk = palet[3];
  }

  if (keyCode == 53) {
    seciliRenk = palet[4];
  }

  if (keyCode == 32) {
    background(0);
  }

  if (keyCode == 16) {
    yapistir = true;
  }
}

void keyReleased() {
  if (keyCode == 16) {
    yapistir = false;
    yapistimi = false;
  }
}