Python qgis.core.QgsApplication() Examples

The following are 6 code examples of qgis.core.QgsApplication(). You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may also want to check out all available functions/classes of the module qgis.core , or try the search function .
Example #1
Source File: utils.py    From stdm with GNU General Public License v2.0 5 votes vote down vote up 
def qgis_app():
    """
    Start QGIS application to test against. Based on code from Inasafe plugin.
    :return: Reference to QGIS application, canvas and parent widget.
    :rtype:(QgsApplication, QWidget, QgsMapCanvas)
    """
    global QGIS_APP

    if QGIS_APP is None:
        gui_flag = True

        QCoreApplication.setOrganizationName('QGIS')
        QCoreApplication.setOrganizationDomain('qgis.org')
        QCoreApplication.setApplicationName('STDM_Testing')

        QGIS_APP = QgsApplication(sys.argv, gui_flag)
        QGIS_APP.initQgis()

    global PARENT
    if PARENT is None:
        PARENT = QWidget()

    global CANVAS
    if CANVAS is None:
        CANVAS = QgsMapCanvas(PARENT)
        CANVAS.resize(QSize(400, 400))

    return QGIS_APP, CANVAS, PARENT
Example #2
Source File: utilities.py    From raster-vision-qgis with GNU General Public License v3.0 4 votes vote down vote up 
def get_qgis_app():
    """ Start one QGIS application to test against.

    :returns: Handle to QGIS app, canvas, iface and parent. If there are any
        errors the tuple members will be returned as None.
    :rtype: (QgsApplication, CANVAS, IFACE, PARENT)

    If QGIS is already running the handle to that app will be returned.
    """

    try:
        from PyQt5 import QtGui, QtCore
        from qgis.core import QgsApplication
        from qgis.gui import QgsMapCanvas
        from .qgis_interface import QgisInterface
    except ImportError:
        return None, None, None, None

    global QGIS_APP  # pylint: disable=W0603

    if QGIS_APP is None:
        gui_flag = True  # All test will run qgis in gui mode
        #noinspection PyPep8Naming
        QGIS_APP = QgsApplication(sys.argv, gui_flag)
        # Make sure QGIS_PREFIX_PATH is set in your env if needed!
        QGIS_APP.initQgis()
        s = QGIS_APP.showSettings()
        LOGGER.debug(s)

    global PARENT  # pylint: disable=W0603
    if PARENT is None:
        #noinspection PyPep8Naming
        PARENT = QtGui.QWidget()

    global CANVAS  # pylint: disable=W0603
    if CANVAS is None:
        #noinspection PyPep8Naming
        CANVAS = QgsMapCanvas(PARENT)
        CANVAS.resize(QtCore.QSize(400, 400))

    global IFACE  # pylint: disable=W0603
    if IFACE is None:
        # QgisInterface is a stub implementation of the QGIS plugin interface
        #noinspection PyPep8Naming
        IFACE = QgisInterface(CANVAS)

    return QGIS_APP, CANVAS, IFACE, PARENT
Example #3
Source File: utilities.py    From Hqgis with GNU General Public License v3.0 4 votes vote down vote up 
def get_qgis_app():
    """ Start one QGIS application to test against.

    :returns: Handle to QGIS app, canvas, iface and parent. If there are any
        errors the tuple members will be returned as None.
    :rtype: (QgsApplication, CANVAS, IFACE, PARENT)

    If QGIS is already running the handle to that app will be returned.
    """

    try:
        from PyQt5 import QtGui, QtCore
        from qgis.core import QgsApplication
        from qgis.gui import QgsMapCanvas
        from .qgis_interface import QgisInterface
    except ImportError:
        return None, None, None, None

    global QGIS_APP  # pylint: disable=W0603

    if QGIS_APP is None:
        gui_flag = True  # All test will run qgis in gui mode
        # noinspection PyPep8Naming
        QGIS_APP = QgsApplication(sys.argv, gui_flag)
        # Make sure QGIS_PREFIX_PATH is set in your env if needed!
        QGIS_APP.initQgis()
        s = QGIS_APP.showSettings()
        LOGGER.debug(s)

    global PARENT  # pylint: disable=W0603
    if PARENT is None:
        # noinspection PyPep8Naming
        PARENT = QtGui.QWidget()

    global CANVAS  # pylint: disable=W0603
    if CANVAS is None:
        # noinspection PyPep8Naming
        CANVAS = QgsMapCanvas(PARENT)
        CANVAS.resize(QtCore.QSize(400, 400))

    global IFACE  # pylint: disable=W0603
    if IFACE is None:
        # QgisInterface is a stub implementation of the QGIS plugin interface
        # noinspection PyPep8Naming
        IFACE = QgisInterface(CANVAS)

    return QGIS_APP, CANVAS, IFACE, PARENT
Example #4
Source File: utilities.py    From WMF with GNU General Public License v3.0 4 votes vote down vote up 
def get_qgis_app():
    """ Start one QGIS application to test against.

    :returns: Handle to QGIS app, canvas, iface and parent. If there are any
        errors the tuple members will be returned as None.
    :rtype: (QgsApplication, CANVAS, IFACE, PARENT)

    If QGIS is already running the handle to that app will be returned.
    """

    try:
        from qgis.PyQt import QtGui, QtCore
        from qgis.core import QgsApplication
        from qgis.gui import QgsMapCanvas
        from .qgis_interface import QgisInterface
    except ImportError:
        return None, None, None, None

    global QGIS_APP  # pylint: disable=W0603

    if QGIS_APP is None:
        gui_flag = True  # All test will run qgis in gui mode
        #noinspection PyPep8Naming
        QGIS_APP = QgsApplication(sys.argv, gui_flag)
        # Make sure QGIS_PREFIX_PATH is set in your env if needed!
        QGIS_APP.initQgis()
        s = QGIS_APP.showSettings()
        LOGGER.debug(s)

    global PARENT  # pylint: disable=W0603
    if PARENT is None:
        #noinspection PyPep8Naming
        PARENT = QtGui.QWidget()

    global CANVAS  # pylint: disable=W0603
    if CANVAS is None:
        #noinspection PyPep8Naming
        CANVAS = QgsMapCanvas(PARENT)
        CANVAS.resize(QtCore.QSize(400, 400))

    global IFACE  # pylint: disable=W0603
    if IFACE is None:
        # QgisInterface is a stub implementation of the QGIS plugin interface
        #noinspection PyPep8Naming
        IFACE = QgisInterface(CANVAS)

    return QGIS_APP, CANVAS, IFACE, PARENT
Example #5
Source File: utilities.py    From qgis-earthengine-plugin with MIT License 4 votes vote down vote up 
def get_qgis_app():
    """ Start one QGIS application to test against.

    :returns: Handle to QGIS app, canvas, iface and parent. If there are any
        errors the tuple members will be returned as None.
    :rtype: (QgsApplication, CANVAS, IFACE, PARENT)

    If QGIS is already running the handle to that app will be returned.
    """

    try:
        from qgis.PyQt import QtGui, QtCore
        from qgis.core import QgsApplication
        from qgis.gui import QgsMapCanvas
        from .qgis_interface import QgisInterface
    except ImportError:
        return None, None, None, None

    global QGIS_APP  # pylint: disable=W0603

    if QGIS_APP is None:
        gui_flag = True  # All test will run qgis in gui mode
        #noinspection PyPep8Naming
        QGIS_APP = QgsApplication(sys.argv, gui_flag)
        # Make sure QGIS_PREFIX_PATH is set in your env if needed!
        QGIS_APP.initQgis()
        s = QGIS_APP.showSettings()
        LOGGER.debug(s)

    global PARENT  # pylint: disable=W0603
    if PARENT is None:
        #noinspection PyPep8Naming
        PARENT = QtGui.QWidget()

    global CANVAS  # pylint: disable=W0603
    if CANVAS is None:
        #noinspection PyPep8Naming
        CANVAS = QgsMapCanvas(PARENT)
        CANVAS.resize(QtCore.QSize(400, 400))

    global IFACE  # pylint: disable=W0603
    if IFACE is None:
        # QgisInterface is a stub implementation of the QGIS plugin interface
        #noinspection PyPep8Naming
        IFACE = QgisInterface(CANVAS)

    return QGIS_APP, CANVAS, IFACE, PARENT
Example #6
Source File: utilities.py    From plugin_build_tool with GNU General Public License v2.0 4 votes vote down vote up 
def get_qgis_app():
    """ Start one QGIS application to test against.

    :returns: Handle to QGIS app, canvas, iface and parent. If there are any
        errors the tuple members will be returned as None.
    :rtype: (QgsApplication, CANVAS, IFACE, PARENT)

    If QGIS is already running the handle to that app will be returned.
    """

    try:
        from PyQt4 import QtGui, QtCore
        from qgis.core import QgsApplication
        from qgis.gui import QgsMapCanvas
        from qgis_interface import QgisInterface
    except ImportError:
        return None, None, None, None

    global QGIS_APP  # pylint: disable=W0603

    if QGIS_APP is None:
        gui_flag = True  # All test will run qgis in gui mode
        #noinspection PyPep8Naming
        QGIS_APP = QgsApplication(sys.argv, gui_flag)
        # Make sure QGIS_PREFIX_PATH is set in your env if needed!
        QGIS_APP.initQgis()
        s = QGIS_APP.showSettings()
        LOGGER.debug(s)

    global PARENT  # pylint: disable=W0603
    if PARENT is None:
        #noinspection PyPep8Naming
        PARENT = QtGui.QWidget()

    global CANVAS  # pylint: disable=W0603
    if CANVAS is None:
        #noinspection PyPep8Naming
        CANVAS = QgsMapCanvas(PARENT)
        CANVAS.resize(QtCore.QSize(400, 400))

    global IFACE  # pylint: disable=W0603
    if IFACE is None:
        # QgisInterface is a stub implementation of the QGIS plugin interface
        #noinspection PyPep8Naming
        IFACE = QgisInterface(CANVAS)

    return QGIS_APP, CANVAS, IFACE, PARENT