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Implement scene.camera.follow(function) #200

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Mar 5, 2022
Merged

Implement scene.camera.follow(function) #200

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21 changes: 17 additions & 4 deletions vpython/vpython.py
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Original file line number Diff line number Diff line change
Expand Up @@ -188,7 +188,8 @@ class baseObj(object):
updates = {'cmds':[], 'methods':[], 'attrs':{}}
object_registry = {} ## idx -> instance
attach_arrows = []
attach_trails = [] ## needed only for functions
attach_trails = [] # needed only for functions
follow_objects = [] # entries are [invisible object to follow, function to call for pos, prevous pos]
attrs = set() # each element is (idx, attr name)

@classmethod
Expand Down Expand Up @@ -232,6 +233,15 @@ def handle_attach(cls): # called when about to send data to the browser
continue
aa._last_val = fval

## update every scene.camera.follow(function)
for aa in cls.follow_objects:
obj = aa[0]
val = aa[1]()
lastpos = aa[2]
if val != lastpos:
aa[2] = val
obj.pos = val

def __init__(self, **kwargs):
if not (baseObj._view_constructed or
baseObj._canvas_constructing):
Expand Down Expand Up @@ -1338,7 +1348,7 @@ def round(self):
return self._round
@round.setter
def round(self,value):
raise AttributeError('Cannot change the "round" attribute of an attach_arrow.')
raise AttributeError('Cannot change the "round" attribute of an arrow.')

@property
def scale(self):
Expand Down Expand Up @@ -2770,7 +2780,6 @@ def project(self, **args):
class Camera(object):
def __init__(self, canvas):
self._canvas = canvas
self._followthis = None
self._pos = None

@property
Expand Down Expand Up @@ -2933,9 +2942,13 @@ def __init__(self, **args):
distant_light(direction=vector(-0.88, -0.22, -0.44), color=color.gray(0.3))
baseObj._canvas_constructing = False

def follow(self, obj): ## should allow a function also
def follow(self, obj):
if obj is None:
self.addmethod('follow', 'None')
elif callable(obj):
b = box(visible=False)
baseObj.follow_objects.append([b, obj, vector(1.2e15,3.4e14,-5.6e13)])
self.addmethod('follow', b.idx)
else:
self.addmethod('follow', obj.idx)

Expand Down