// line that goes through x, y at specified angle
// angle is in radians
srecord LineThroughPoint(double x, double y, double angle) is G2Drawable {
  *(IDoublePt p, double *angle) {
    x = p.x_double();
    y = p.y_double();
  }
  
  DoublePt pointOnLine(double distance) {
    ret doublePt(
      x+sin(angle)*distance,
      y+cos(angle)*distance);
  }
  
  // uses color selected in g
  public void drawOn(Graphics2D g) {
    int distance = 200;
    DoublePt p1 = pointOnLine(-distance);
    DoublePt p2 = pointOnLine(distance);
    g.drawLine(
      iround(p1.x_double()), iround(p1.y_double()),
      iround(p2.x_double()), iround(p2.y_double()));
  }
}