from pyfeyn.points import Mark
import pyx


class CrossMark(Mark):
    def __init__(self,
                 size=0.075):
        """A cross marker, e.g. to show neutrino oscillations."""
        self.size = size
        self.point = None

    def getPath(self):
        """Return the path for this marker."""
        if self.point is not None:
            x, y = self.point.getXY()
            return pyx.path.path(pyx.path.moveto(x - self.size, y - self.size),
                                 pyx.path.lineto(x + self.size, y + self.size),
                                 pyx.path.moveto(x - self.size, y + self.size),
                                 pyx.path.lineto(x + self.size, y - self.size)
                                 ).path()
        return None

CROSS = CrossMark()