如何解决如何将对象动态添加到wxpython中嵌入的vispy canvas中的场景中
我想在按下按钮时添加一个箭头（某些对象）。该代码是vispy存储库中给出的示例的修改版本。
import wx
from vispy import scene
from vispy.scene.visuals import Arrow
import numpy as np
class Canvas(scene.SceneCanvas):
def __init__(self,*a,**k):
sizes = k.pop("sizes",(300,300)) # Default value is (300,300)
scene.SceneCanvas.__init__(self,**k,size=sizes)
view = self.central_widget.add_view()
view.bgcolor = 'sNow'
view.camera = scene.TurntableCamera(up='+y',azimuth=100,elevation=15,fov=60)
axis = scene.visuals.XYZAxis(parent=view.scene)
arrow1 = np.array([(0,1,0)]) # Arrow direction,position
arr = Arrow(pos=np.array([(0,0),(1,0)]),color='teal',method='gl',width=5.,arrows=arrow1,arrow_type="angle_30",arrow_size=5.0,arrow_color='teal',antialias=True,parent=view.scene)
self.show()
class mainFrame ( wx.Frame ):
def __init__( self,parent ):
wx.Frame.__init__ ( self,parent,id = wx.ID_ANY,title = "Add Object",pos = wx.DefaultPosition,size = wx.Size( 905,569 ),style = wx.DEFAULT_FRAME_STYLE|wx.TAB_TRAVERSAL )
self.SetSizeHints( wx.DefaultSize,wx.DefaultSize )
bSizer1 = wx.BoxSizer( wx.VERTICAL )
self.panel_vispy = wx.Panel( self,wx.ID_ANY,wx.DefaultPosition,wx.DefaultSize,wx.TAB_TRAVERSAL )
bSizer1.Add( self.panel_vispy,9,wx.EXPAND |wx.ALL,5 )
self.panel_Buttons = wx.Panel( self,wx.TAB_TRAVERSAL )
bSizer2 = wx.BoxSizer( wx.HORIZONTAL )
bSizer2.Add( ( 0,wx.EXPAND,5 )
self.button_AddArrow = wx.Button( self.panel_Buttons,u"Add Arrow",0 )
bSizer2.Add( self.button_AddArrow,wx.ALL|wx.ALIGN_CENTER_VERTICAL,5 )
bSizer2.Add( ( 0,5 )
self.panel_Buttons.SetSizer( bSizer2 )
self.panel_Buttons.Layout()
bSizer2.Fit( self.panel_Buttons )
bSizer1.Add( self.panel_Buttons,5 )
self.SetSizer( bSizer1 )
self.Layout()
self.Centre( wx.BOTH )
# Connect Events
self.button_AddArrow.Bind(wx.EVT_BUTTON,self.button_AddArrow_OnClick)
self.panel_vispy.canvas = Canvas(app="wx",parent=self,sizes=self.panel_vispy.GetSize())
def button_AddArrow_OnClick(self,event):
print("Adding arrow")
arrow2 = np.array([(0,color='red',arrows=arrow2,arrow_color='red',antialias=True)#,parent=view.scene) -Unable to access view from the Canvas class
if __name__ == "__main__":
app = wx.App(False)
GUI = mainFrame(None)
GUI.Show(True)
app.MainLoop()
我已经按照示例中的说明创建了Canvas，并尝试从mainFrame实例化它。将创建__init__类的Canvas中给定的所有对象。如果要在通过单击按钮创建GUI之后添加任何新对象，则无法从view访问Canvas类中的mainFrame。还是有其他方法可以实现这一目标。
更新： 以下是遵循注释中给出的建议的代码：
import wx
from vispy import scene,gloo
from vispy.scene.visuals import Arrow
import numpy as np
class Canvas(scene.SceneCanvas):
def __init__(self,size=sizes)
self.unfreeze()
self.view = self.central_widget.add_view()
self.view.bgcolor = 'sNow'
self.view.camera = scene.TurntableCamera(up='+y',fov=60)
axis = scene.visuals.XYZAxis(parent=self.view.scene)
arrow1 = np.array([(0,parent=self.view.scene)
self.show()
class mainFrame ( wx.Frame ):
def __init__( self,parent=self.panel_vispy.canvas.view.scene)
self.panel_vispy.canvas.update() # Canvas not getting updated
if __name__ == "__main__":
app = wx.App(False)
GUI = mainFrame(None)
GUI.Show(True)
app.MainLoop()
代码现在可以正确运行，这意味着可能已添加了箭头，但场景未更新。
解决方法
根据@djhoese和@RolfofSaxony的建议，我更新了代码。现在，该代码在单击按钮后成功添加了一个箭头。
import wx
from vispy import scene,gloo
from vispy.scene.visuals import Arrow
import numpy as np
class Canvas(scene.SceneCanvas):
def __init__(self,*a,**k):
sizes = k.pop("sizes",(300,300)) # Default value is (300,300)
scene.SceneCanvas.__init__(self,**k,size=sizes)
self.unfreeze()
self.view = self.central_widget.add_view()
self.view.bgcolor = 'snow'
self.view.camera = scene.TurntableCamera(up='+y',azimuth=100,elevation=15,fov=60)
axis = scene.visuals.XYZAxis(parent=self.view.scene)
arrow1 = np.array([(0,1,0)]) # Arrow direction,position
arr = Arrow(pos=np.array([(0,0),(1,0)]),color='red',method='gl',width=5.,arrows=arrow1,arrow_type="angle_30",arrow_size=5.0,arrow_color='blue',antialias=True,parent=self.view.scene)
self.show()
class mainFrame ( wx.Frame ):
def __init__( self,parent ):
wx.Frame.__init__ ( self,parent,id = wx.ID_ANY,title = "Add Object",pos = wx.DefaultPosition,size = wx.Size( 905,569 ),style = wx.DEFAULT_FRAME_STYLE|wx.TAB_TRAVERSAL )
self.SetSizeHints( wx.DefaultSize,wx.DefaultSize )
bSizer1 = wx.BoxSizer( wx.VERTICAL )
self.panel_vispy = wx.Panel( self,wx.ID_ANY,wx.DefaultPosition,wx.DefaultSize,wx.TAB_TRAVERSAL )
bSizer1.Add( self.panel_vispy,9,wx.EXPAND |wx.ALL,5 )
self.panel_Buttons = wx.Panel( self,wx.TAB_TRAVERSAL )
bSizer2 = wx.BoxSizer( wx.HORIZONTAL )
bSizer2.Add( ( 0,wx.EXPAND,5 )
self.button_AddArrow = wx.Button( self.panel_Buttons,u"Add Arrow",0 )
bSizer2.Add( self.button_AddArrow,wx.ALL|wx.ALIGN_CENTER_VERTICAL,5 )
bSizer2.Add( ( 0,5 )
self.panel_Buttons.SetSizer( bSizer2 )
self.panel_Buttons.Layout()
bSizer2.Fit( self.panel_Buttons )
bSizer1.Add( self.panel_Buttons,5 )
self.SetSizer( bSizer1 )
self.Layout()
self.Centre( wx.BOTH )
# Connect Events
self.button_AddArrow.Bind(wx.EVT_BUTTON,self.button_AddArrow_OnClick)
self.panel_vispy.canvas = Canvas(app="wx",parent=self,sizes=self.panel_vispy.GetSize())
def button_AddArrow_OnClick(self,event):
print("Adding arrow")
arrow2 = np.array([(0,-1,-0.5,1)]) # Arrow direction,(-1,1)]),color='green',arrows=arrow2,parent=self.panel_vispy.canvas.view.scene)
if __name__ == "__main__":
app = wx.App(False)
GUI = mainFrame(None)
GUI.Show(True)
app.MainLoop()
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