def testSetCacheImages(self):
cache = QgsMapRendererCache()
# not set image
im = cache.cacheImage('littlehands')
self.assertTrue(im.isNull())
self.assertFalse(cache.hasCacheImage('littlehands'))
# set image
im = QImage(200, 200, QImage.Format_RGB32)
cache.setCacheImage('littlehands', im)
self.assertFalse(im.isNull())
self.assertEqual(cache.cacheImage('littlehands'), im)
self.assertTrue(cache.hasCacheImage('littlehands'))
# test another not set image when cache has images
self.assertTrue(cache.cacheImage('bad').isNull())
self.assertFalse(cache.hasCacheImage('bad'))
# clear cache image
cache.clearCacheImage('not in cache') # no crash!
cache.clearCacheImage('littlehands')
im = cache.cacheImage('littlehands')
self.assertTrue(im.isNull())
self.assertFalse(cache.hasCacheImage('littlehands'))
# clear whole cache
im = QImage(200, 200, QImage.Format_RGB32)
cache.setCacheImage('littlehands', im)
self.assertFalse(im.isNull())
self.assertTrue(cache.hasCacheImage('littlehands'))
cache.clear()
im = cache.cacheImage('littlehands')
self.assertTrue(im.isNull())
self.assertFalse(cache.hasCacheImage('littlehands'))
def _get_composer_image(self, width, height, dpi):
image = QImage(QSize(width, height),
self._TestMapSettings.outputImageFormat())
image.fill(QColor(152, 219, 249).rgb())
image.setDotsPerMeterX(dpi / 25.4 * 1000)
image.setDotsPerMeterY(dpi / 25.4 * 1000)
p = QPainter(image)
p.setRenderHint(
QPainter.Antialiasing,
self._TestMapSettings.testFlag(QgsMapSettings.Antialiasing)
)
self._c.renderPage(p, 0)
p.end()
# image = self._c.printPageAsRaster(0)
# """:type: QImage"""
if image.isNull():
return False, ''
filepath = getTempfilePath('png')
res = image.save(filepath, 'png')
if not res:
os.unlink(filepath)
filepath = ''
return res, filepath
def _get_composer_image(self, width, height, dpi):
image = QImage(QSize(width, height),
self._TestMapSettings.outputImageFormat())
image.fill(QColor(152, 219, 249).rgb())
image.setDotsPerMeterX(dpi / 25.4 * 1000)
image.setDotsPerMeterY(dpi / 25.4 * 1000)
p = QPainter(image)
p.setRenderHint(
QPainter.Antialiasing,
self._TestMapSettings.testFlag(QgsMapSettings.Antialiasing))
self._c.renderPage(p, 0)
p.end()
# image = self._c.printPageAsRaster(0)
# """:type: QImage"""
if image.isNull():
return False, ''
filepath = getTempfilePath('png')
res = image.save(filepath, 'png')
if not res:
os.unlink(filepath)
filepath = ''
return res, filepath
class PhotoViewer(QScrollArea):
"""
Widget for viewing images by incorporating basic navigation options.
"""
def __init__(self, parent=None, photo_path=""):
QScrollArea.__init__(self, parent)
self.setBackgroundRole(QPalette.Dark)
self._printer = QPrinter()
self._lbl_photo = QLabel()
self._lbl_photo.setBackgroundRole(QPalette.Base)
self._lbl_photo.setSizePolicy(QSizePolicy.Ignored, QSizePolicy.Ignored)
self._lbl_photo.setScaledContents(True)
self.setWidget(self._lbl_photo)
self._photo_path = photo_path
self._ph_image = None
self._scale_factor = 1.0
self._aspect_ratio = -1
self._create_actions()
if self._photo_path:
self.load_document(self._photo_path)
def _create_actions(self):
"""
Create actions for basic image navigation.
"""
self._zoom_in_act = QAction(
QApplication.translate("PhotoViewer", "Zoom &In (25%)"), self)
self._zoom_in_act.setShortcut(
QApplication.translate("PhotoViewer", "Ctrl++"))
self._zoom_in_act.setEnabled(False)
self._zoom_in_act.triggered.connect(self.zoom_in)
self._zoom_out_act = QAction(
QApplication.translate("PhotoViewer", "Zoom &Out (25%)"), self)
self._zoom_out_act.setShortcut(
QApplication.translate("PhotoViewer", "Ctrl+-"))
self._zoom_out_act.setEnabled(False)
self._zoom_out_act.triggered.connect(self.zoom_out)
self._normal_size_act = QAction(
QApplication.translate("PhotoViewer", "&Normal Size"), self)
self._normal_size_act.setShortcut(
QApplication.translate("PhotoViewer", "Ctrl+S"))
self._normal_size_act.setEnabled(False)
self._normal_size_act.triggered.connect(self.normal_size)
self._fit_to_window_act = QAction(
QApplication.translate("PhotoViewer", "&Fit to Window"), self)
self._fit_to_window_act.setShortcut(
QApplication.translate("PhotoViewer", "Ctrl+F"))
self._fit_to_window_act.setEnabled(False)
self._fit_to_window_act.setCheckable(True)
self._fit_to_window_act.triggered.connect(self.fit_to_window)
self._print_act = QAction(
QApplication.translate("PhotoViewer", "&Print"), self)
self._print_act.setShortcut(
QApplication.translate("PhotoViewer", "Ctrl+P"))
self._print_act.setEnabled(False)
self._print_act.triggered.connect(self.print_photo)
def zoom_in(self):
self.scale_photo(1.25)
def zoom_out(self):
self.scale_photo(0.8)
def normal_size(self):
self._lbl_photo.adjustSize()
self._scale_factor = 1.0
def fit_to_window(self):
fit_to_win = self._fit_to_window_act.isChecked()
self.setWidgetResizable(fit_to_win)
if not fit_to_win:
self.normal_size()
self.update_actions()
def print_photo(self):
print_dialog = QPrintDialog(self._printer, self)
if print_dialog.exec_() == QDialog.Accepted:
painter = QPainter(self._printer)
rect = painter.viewport()
size = self._lbl_photo.pixmap().size()
size.scale(rect.size(), Qt.KeepAspectRatio)
painter.setViewport(rect.x(), rect.y(), size.width(),
size.height())
painter.setWindow(self._lbl_photo.pixmap().rect())
painter.drawPixmap(0, 0, self._lbl_photo.pixmap())
def wheelEvent(self, event):
"""
Zoom the image based on the mouse wheel rotation action.
:param event: Event containing the wheel rotation info.
:type event: QWheelEvent
"""
degrees = event.delta() / 8
num_steps = degrees / 15
if num_steps < 0:
abs_num_steps = abs(num_steps)
zoom_factor = 1 + (abs_num_steps * 0.25)
else:
zoom_factor = 1 - (num_steps * 0.2)
self.scale_photo(zoom_factor)
def heightForWidth(self, width):
if self._aspect_ratio != -1:
return width / self._aspect_ratio
else:
return -1
def resizeEvent(self, event):
"""
Event for resizing the widget based on the pixmap's aspect ratio.
:param event: Contains event parameters for the resize event.
:type event: QResizeEvent
"""
super(PhotoViewer, self).resizeEvent(event)
def update_actions(self):
self._zoom_out_act.setEnabled(not self._fit_to_window_act.isChecked())
self._zoom_in_act.setEnabled(not self._fit_to_window_act.isChecked())
self._normal_size_act.setEnabled(
not self._fit_to_window_act.isChecked())
def scale_photo(self, factor):
"""
:param factor: Value by which the image will be increased/decreased in the view.
:type factor: float
"""
if not self._lbl_photo.pixmap().isNull():
self._scale_factor *= factor
self._lbl_photo.resize(self._scale_factor *
self._lbl_photo.pixmap().size())
self._adjust_scroll_bar(self.horizontalScrollBar(), factor)
self._adjust_scroll_bar(self.verticalScrollBar(), factor)
self._zoom_in_act.setEnabled(self._scale_factor < 3.0)
self._zoom_out_act.setEnabled(self._scale_factor > 0.333)
def _adjust_scroll_bar(self, scroll_bar, factor):
scroll_bar.setValue(
int(factor * scroll_bar.value() +
((factor - 1) * scroll_bar.pageStep() / 2)))
def load_document(self, photo_path):
if photo_path:
self._ph_image = QImage(photo_path)
if self._ph_image.isNull():
return False
self._photo_path = photo_path
ph_pixmap = QPixmap.fromImage(self._ph_image)
self._lbl_photo.setPixmap(ph_pixmap)
self._scale_factor = 1.0
self._aspect_ratio = ph_pixmap.width() / ph_pixmap.height()
self._fit_to_window_act.setEnabled(True)
self._print_act.setEnabled(True)
self._fit_to_window_act.trigger()
self.update_actions()
return ph_pixmap
return True
def photo_location(self):
"""
:returns: Absolute path of the photo in the central document repository.
"""
return self._photo_path
def set_actions(self, menu):
"""
Add custom actions to the sub-window menu
"""
menu.addSeparator()
menu.addAction(self._zoom_in_act)
menu.addAction(self._zoom_out_act)
menu.addAction(self._normal_size_act)
menu.addAction(self._fit_to_window_act)
menu.addSeparator()
menu.addAction(self._print_act)