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Update hatch.py #27337

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21 changes: 19 additions & 2 deletions lib/matplotlib/hatch.py
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Original file line number Diff line number Diff line change
Expand Up @@ -167,6 +167,22 @@ def __init__(self, hatch, density):
self.shape_codes[0] = Path.MOVETO
super().__init__(hatch, density)

class DashedHatch(HatchPatternBase):
def __init__(self, hatch, density):
self.num_lines = int((hatch.count('_') + hatch.count('+')) * density)
self.num_vertices = self.num_lines * 2

def set_vertices_and_codes(self, vertices, codes):
steps, stepsize = np.linspace(0.0, 1.0, self.num_lines, False,
retstep=True)
steps += stepsize / 2.
vertices[0::2, 0] = steps
vertices[0::2, 1] = 0.0
vertices[1::2, 0] = steps
vertices[1::2, 1] = 1.0
codes[0::2] = Path.MOVETO
codes[1::2] = Path.LINETO

_hatch_types = [
HorizontalHatch,
VerticalHatch,
Expand All @@ -175,12 +191,13 @@ def __init__(self, hatch, density):
SmallCircles,
LargeCircles,
SmallFilledCircles,
Stars
Stars,
DashedHatch
]


def _validate_hatch_pattern(hatch):
valid_hatch_patterns = set(r'-+|/\xXoO.*')
valid_hatch_patterns = set(r'-+|/\xXoO.*_')
if hatch is not None:
invalids = set(hatch).difference(valid_hatch_patterns)
if invalids:
Expand Down