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Added VMobject.get_subcurve, and cleaned up implementation of DashedVMobject

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This commit is contained in:
Grant Sanderson 2019-02-07 15:41:15 -08:00
parent 0dfc5a576b
commit 3de8c2f04c
1 changed files with 26 additions and 11 deletions
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37
manimlib/mobject/types/vectorized_mobject.py
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@ -788,6 +788,11 @@ class VMobject(Mobject):
)) ))
return self return self
def get_subcurve(self, a, b):
vmob = self.copy()
vmob.pointwise_become_partial(self, a, b)
return vmob
class VGroup(VMobject): class VGroup(VMobject):
def __init__(self, *vmobjects, **kwargs): def __init__(self, *vmobjects, **kwargs):
@ -834,21 +839,31 @@ class CurvesAsSubmobjects(VGroup):
self.add(part) self.add(part)
class DashedMobject(VMobject): class DashedVMobject(VMobject):
CONFIG = { CONFIG = {
"dashes_num": 15, "num_dashes": 15,
"spacing": 0.5, "positive_space_ratio": 0.5,
"color": WHITE "color": WHITE
} }
def __init__(self, mobject, **kwargs): def __init__(self, vmobject, **kwargs):
VMobject.__init__(self, **kwargs) VMobject.__init__(self, **kwargs)
num_dashes = self.num_dashes
ps_ratio = self.positive_space_ratio
buff = float(self.spacing) / self.dashes_num # End points of the unit interval for division
alphas = np.linspace(0, 1, num_dashes + 1)
# This determines the length of each "dash"
full_d_alpha = (1.0 / num_dashes)
partial_d_alpha = full_d_alpha * ps_ratio
# Rescale so that the last point of vmobject will
# be the end of the last dash
alphas /= (1 - full_d_alpha + partial_d_alpha)
for i in range(self.dashes_num): self.add(*[
a = ((1 + buff) * i) / self.dashes_num vmobject.get_subcurve(alpha, alpha + partial_d_alpha)
b = 1 - ((1 + buff) * (self.dashes_num - 1 - i)) / self.dashes_num for alpha in alphas[:-1]
dash = VMobject(color=self.get_color()) ])
dash.pointwise_become_partial(mobject, a, b) # Family is already taken care of by get_subcurve
self.submobjects.append(dash) # implementation
self.match_style(vmobject, family=False)