Dear PythonOCC users,
The Viewer3d.ExportToImage method creates a BMP file of the displayed CAD
image. It worked well while using WinXP 32bit. However, with Win7 64bit, the
method produces a blank image. Can you please help to resolve the
ExportToImage problem?
I am using Python 2.6 32bit and pythonOCC 0.5 All-In-One with Win7 OS 64bit
with programs in the directory C:\Program Files (x86).
Thank you for your help!
Below is the CADViewer.py code modified to use the ExportToImage method:
import sys, os
import wx
import time
import OCC
from OCC.Display.wxDisplay import wxViewer3d
class AppFrame(wx.Frame):
def __init__(self, parent):
wx.Frame.__init__(self, parent, -1, "CAD Viewer - pythonOCC%s"%
OCC.VERSION,
style=wx.DEFAULT_FRAME_STYLE, pos=(1900,0),
size = (640,480))
self.canva = wxViewer3d(self)
# Creating Menu
menuBar = wx.MenuBar()
menu1 = wx.Menu()
menu1.Append(101, "&Open", "Open a CAD file")
menu1.Append(103, "&Save Image", "Save CAD image")
menu1.Append(102, "&Exit", "Exit application")
self.Bind(wx.EVT_MENU, self.OnOpen, id=101)
self.Bind(wx.EVT_MENU, self.OnExit, id=102)
self.Bind(wx.EVT_MENU, self.OnSaveImage, id=103)
menuBar.Append(menu1, "&File")
self.SetMenuBar(menuBar)
def OnOpen(self,event):
# Choose file dialog
dlg = wx.FileDialog(
self, message="Choose a STEP/IGES/STL/BRep file",
defaultDir=os.getcwd(),
defaultFile="",
wildcard="STEP file (*.stp)|*.stp|STL files (*.stl)|*.stl|IGES
files (*.iges, *.igs)|*.iges|All files (*.*)|*.*|" ,
style=wx.OPEN | wx.MULTIPLE | wx.CHANGE_DIR
)
if dlg.ShowModal() == wx.ID_OK:
paths = dlg.GetPaths()
self.LoadFile(paths[0])
def LoadFile(self,filename):
extension = os.path.basename(filename).split(".").pop().lower()
start_time = time.time()
if extension =="step" or extension == "stp":
from OCC import STEPControl
stepReader = STEPControl.STEPControl_Reader()
stepReader.ReadFile(str(filename))
numTranslated = stepReader.TransferRoots()
shape = stepReader.OneShape()
elif extension == "stl":
from OCC import TopoDS, StlAPI
shape = TopoDS.TopoDS_Shape()
stl_reader = StlAPI.StlAPI_Reader()
stl_reader.Read(shape,str(filename))
elif extension =="iges" or extension =="igs":
from OCC import IGESControl
i = IGESControl.IGESControl_Controller()
i.Init()
iges_reader = IGESControl.IGESControl_Reader()
iges_reader.ReadFile(str(filename))
iges_reader.TransferRoots()
shape = iges_reader.OneShape()
elif extension == "brep":
from OCC import TopoDS, BRep, BRepTools
shape = TopoDS.TopoDS_Shape()
builder = BRep.BRep_Builder()
BRepTools.BRepTools().Read(shape,str(filename),builder)
else:
return True
self.canva._display.DisplayShape(shape)
end_time = time.time()
self.SetTitle("CAD Viewer - pythonOCC %s:%s"%(OCC.VERSION,filename))
duration = end_time-start_time
print "%s STEP file loaded and displayed in %f seconds."%
(filename,duration)
def OnSaveImage(self,event):
self.canva._display.Repaint()
sp = wx.StandardPaths.Get()
fn = os.path.join(sp.GetTempDir(), "CADImage.bmp")
self.canva._display.ExportToImage(str(fn))
print "saving image to file: %s"%str(fn)
self.canva._display.Repaint()
def OnExit(self,event):
sys.exit(0)
if __name__=="__main__":
app = wx.PySimpleApp()
wx.InitAllImageHandlers()
frame = AppFrame(None)
frame.Show(True)
wx.SafeYield() #under Linux, frame must be shown before Display3D is
initialized
frame.canva.InitDriver()
app.SetTopWindow(frame)
app.MainLoop()
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