cadquery/tests/test_importers.py

"""
    Tests file importers such as STEP
"""
# core modules
import tempfile
import os

from cadquery import *
from cadquery import exporters
from cadquery import importers
from tests import BaseTest

# where unit test output will be saved
OUTDIR = tempfile.gettempdir()


class TestImporters(BaseTest):
    def importBox(self, importType, fileName):
        """
        Exports a simple box to a STEP file and then imports it again
        :param importType: The type of file we're importing (STEP, STL, etc)
        :param fileName: The path and name of the file to write to
        """
        # We're importing a STEP file
        if importType == importers.ImportTypes.STEP:
            # We first need to build a simple shape to export
            shape = Workplane("XY").box(1, 2, 3).val()

            # Export the shape to a temporary file
            shape.exportStep(fileName)

            # Reimport the shape from the new STEP file
            importedShape = importers.importShape(importType, fileName)

            # Check to make sure we got a solid back
            self.assertTrue(importedShape.val().ShapeType() == "Solid")

            # Check the number of faces and vertices per face to make sure we have a box shape
            self.assertTrue(importedShape.faces("+X").size() ==
                            1 and importedShape.faces("+X").vertices().size() == 4)
            self.assertTrue(importedShape.faces("+Y").size() ==
                            1 and importedShape.faces("+Y").vertices().size() == 4)
            self.assertTrue(importedShape.faces("+Z").size() ==
                            1 and importedShape.faces("+Z").vertices().size() == 4)

    def testSTEP(self):
        """
        Tests STEP file import
        """
        self.importBox(importers.ImportTypes.STEP, OUTDIR + "/tempSTEP.step")

    def testInvalidSTEP(self):
        """
        Attempting to load an invalid STEP file should throw an exception, but
        not segfault.
        """
        tmpfile = OUTDIR + "/badSTEP.step"
        with open(tmpfile, 'w') as f: f.write("invalid STEP file")
        with self.assertRaises(ValueError):
            importers.importShape(importers.ImportTypes.STEP, tmpfile)

    def testImportMultipartSTEP(self):
        """
        Import a STEP file that contains two objects and ensure that both are
        loaded.
        """
        testdataDir = os.path.join(os.path.dirname(__file__), "testdata")
        filename = os.path.join(testdataDir, "red_cube_blue_cylinder.step")
        objs = importers.importShape(importers.ImportTypes.STEP, filename)
        self.assertEqual(2, len(objs.all()))

if __name__ == '__main__':
    import unittest
    unittest.main()