# Source code for dipy.viz.gmem

    # Shared objects across Horizon's systems

    class GlobalHorizon:
        def __init__(self):
            # window level sharing
            self.window_timer_cnt = 0

            # slicer level sharing
            self.slicer_opacity = 1
            self.slicer_colormap = "gray"
            self.slicer_colormaps = [
                "gray",
                "magma",
                "viridis",
                "jet",
                "Pastel1",
                "disting",
            ]
            self.slicer_colormap_cnt = 0
            self.slicer_axes = ["x", "y", "z"]

            self.slicer_curr_x = None
            self.slicer_curr_y = None
            self.slicer_curr_z = None

            self.slicer_curr_actor_x = None
            self.slicer_curr_actor_y = None
            self.slicer_curr_actor_z = None

            self.slicer_orig_shape = None
            self.slicer_resliced_shape = None

            self.slicer_vol_idx = None
            self.slicer_vol = None

            self.slicer_peaks_actor_z = None
            self.slicer_rgb = False

            self.slicer_grid = False

            # tractogram level sharing
            self.cluster_thr = 15
            # self.cluster_lengths = []  # not used
            # self.cluster_sizes = []  # not used
            # self.cluster_thr_min_max = []  # not used
            self.streamline_actors = []
            self.centroid_actors = []
            self.cluster_actors = []