def createPen(self, color, offset=None):
"""
Creates a pen of the color specified
Args:
color (QColor): color for the line to be set to
offset (bool): if color should be offset or not.
Since this is only two colors, this can be a boolean, rather
than an index.
"""
pen = QPen()
pen.setColor(color)
total_line_space = self.length() + (2 * self.spacing())
if offset:
pen.setDashOffset(self.length() + self.spacing())
pen.setDashPattern([self.length(), total_line_space])
pen.setWidth(self.width)
return pen
