import java.awt.geom.*;

static new ThreadLocal<Bool> drawOutlineTextAlongLine_flip;

static void drawOutlineTextAlongLine(Graphics2D g, S text, int x1, int y1, int x2, int y2, int shift, Color fillColor, Color outlineColor) {
  drawOutlineTextAlongLine(g, text, x1, y1, x2, y2, shift, 0, fillColor, outlineColor);
}

static void drawOutlineTextAlongLine(Graphics2D g, S text, int x1, int y1, int x2, int y2, int shift, float yshift, Color fillColor, Color outlineColor) {
  Bool flip = optPar(drawOutlineTextAlongLine_flip);
  if (y2 == y1 && x2 == x1) ++x2;
  
  new AffineTransform tx;
  double angle = Math.atan2(y2-y1, x2-x1);
  if (flip == null)
    flip = abs(angle) > pi()/2;
  if (flip) angle -= pi();
  tx.translate((x1+x2)/2.0, (y1+y2)/2.0);
  tx.rotate(angle);

  FontMetrics fm = g.getFontMetrics();
  // int y = shift+fm.getLeading()+fm.getMaxAscent(); // below
  int y = -shift-fm.getMaxDescent(); // above
  //print("drawText y=" + y + ", shift=" + shift);
  
  AffineTransform old = g.getTransform();
  g.transform(tx);

  drawTextWithOutline(g, text, -fm.stringWidth(text)/2.0f, y+yshift, fillColor, outlineColor);
  g.setTransform(old);
}