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# -*- coding: utf-8 -*-
#
# Licensed under the terms of the Qwt License
# Copyright (c) 2002 Uwe Rathmann, for the original C++ code
# Copyright (c) 2015 Pierre Raybaut, for the Python translation/optimization
# (see LICENSE file for more details)
"""
QwtNullPaintDevice
------------------
.. autoclass:: QwtNullPaintDevice
:members:
"""
import os
from qtpy.QtCore import QObject
from qtpy.QtGui import QPaintDevice, QPaintEngine, QPainterPath
QT_API = os.environ["QT_API"]
class QwtNullPaintDevice_PrivateData(QObject):
def __init__(self):
QObject.__init__(self)
self.mode = QwtNullPaintDevice.NormalMode
class QwtNullPaintDevice_PaintEngine(QPaintEngine):
def __init__(self, paintdevice):
super(QwtNullPaintDevice_PaintEngine, self).__init__(QPaintEngine.AllFeatures)
self.__paintdevice = paintdevice
def begin(self, paintdevice):
self.setActive(True)
return True
def end(self):
self.setActive(False)
return True
def type(self):
return QPaintEngine.User
def drawRects(self, rects, rectCount=None):
if rectCount is None:
rectCount = len(rects)
device = self.nullDevice()
if device is None:
return
if device.mode() != QwtNullPaintDevice.NormalMode:
try:
QPaintEngine.drawRects(self, rects, rectCount)
except TypeError:
QPaintEngine.drawRects(self, rects)
return
device.drawRects(rects, rectCount)
def drawLines(self, lines, lineCount=None):
if lineCount is None:
lineCount = len(lines)
device = self.nullDevice()
if device is None:
return
if device.mode() != QwtNullPaintDevice.NormalMode and QT_API.startswith("pyqt"):
try:
QPaintEngine.drawLines(self, lines, lineCount)
except TypeError:
QPaintEngine.drawLines(self, lines)
return
device.drawLines(lines, lineCount)
def drawEllipse(self, rect):
device = self.nullDevice()
if device is None:
return
if device.mode() != QwtNullPaintDevice.NormalMode:
QPaintEngine.drawEllipse(self, rect)
return
device.drawEllipse(rect)
def drawPath(self, path):
device = self.nullDevice()
if device is None:
return
device.drawPath(path)
def drawPoints(self, points, pointCount=None):
if pointCount is None:
pointCount = len(points)
device = self.nullDevice()
if device is None:
return
if device.mode() != QwtNullPaintDevice.NormalMode:
try:
QPaintEngine.drawPoints(self, points, pointCount)
except TypeError:
QPaintEngine.drawPoints(self, points)
return
device.drawPoints(points, pointCount)
def drawPolygon(self, *args):
if len(args) == 3:
points, pointCount, mode = args
elif len(args) == 2:
points, mode = args
pointCount = len(points)
else:
raise TypeError("Unexpected arguments")
device = self.nullDevice()
if device is None:
return
if device.mode() == QwtNullPaintDevice.PathMode:
path = QPainterPath()
if pointCount > 0:
path.moveTo(points[0])
for i in range(1, pointCount):
path.lineTo(points[i])
if mode != QPaintEngine.PolylineMode:
path.closeSubpath()
device.drawPath(path)
return
device.drawPolygon(points, pointCount, mode)
def drawPixmap(self, rect, pm, subRect):
device = self.nullDevice()
if device is None:
return
device.drawPixmap(rect, pm, subRect)
def drawTextItem(self, pos, textItem):
device = self.nullDevice()
if device is None:
return
if device.mode() != QwtNullPaintDevice.NormalMode:
QPaintEngine.drawTextItem(self, pos, textItem)
return
device.drawTextItem(pos, textItem)
def drawTiledPixmap(self, rect, pixmap, subRect):
device = self.nullDevice()
if device is None:
return
if device.mode() != QwtNullPaintDevice.NormalMode:
QPaintEngine.drawTiledPixmap(self, rect, pixmap, subRect)
return
device.drawTiledPixmap(rect, pixmap, subRect)
def drawImage(self, rect, image, subRect, flags):
device = self.nullDevice()
if device is None:
return
device.drawImage(rect, image, subRect, flags)
def updateState(self, state):
device = self.nullDevice()
if device is None:
return
device.updateState(state)
def nullDevice(self):
if not self.isActive():
return
return self.__paintdevice
class QwtNullPaintDevice(QPaintDevice):
"""
A null paint device doing nothing
Sometimes important layout/rendering geometries are not
available or changeable from the public Qt class interface.
( f.e hidden in the style implementation ).
`QwtNullPaintDevice` can be used to manipulate or filter out
this information by analyzing the stream of paint primitives.
F.e. `QwtNullPaintDevice` is used by `QwtPlotCanvas` to identify
styled backgrounds with rounded corners.
Modes:
* `NormalMode`:
All vector graphic primitives are painted by
the corresponding draw methods
* `PolygonPathMode`:
Vector graphic primitives ( beside polygons ) are mapped to a
`QPainterPath` and are painted by `drawPath`. In `PolygonPathMode`
mode only a few draw methods are called:
- `drawPath()`
- `drawPixmap()`
- `drawImage()`
- `drawPolygon()`
* `PathMode`:
Vector graphic primitives are mapped to a `QPainterPath`
and are painted by `drawPath`. In `PathMode` mode
only a few draw methods are called:
- `drawPath()`
- `drawPixmap()`
- `drawImage()`
"""
# enum Mode
NormalMode, PolygonPathMode, PathMode = list(range(3))
def __init__(self):
super(QwtNullPaintDevice, self).__init__()
self.__engine = None
self.__data = QwtNullPaintDevice_PrivateData()
def setMode(self, mode):
"""
Set the render mode
:param int mode: New mode
.. seealso::
:py:meth:`mode()`
"""
self.__data.mode = mode
def mode(self):
"""
:return: Render mode
.. seealso::
:py:meth:`setMode()`
"""
return self.__data.mode
def paintEngine(self):
if self.__engine is None:
self.__engine = QwtNullPaintDevice_PaintEngine(self)
return self.__engine
def metric(self, deviceMetric):
if deviceMetric == QPaintDevice.PdmWidth:
value = self.sizeMetrics().width()
elif deviceMetric == QPaintDevice.PdmHeight:
value = self.sizeMetrics().height()
elif deviceMetric == QPaintDevice.PdmNumColors:
value = 0xFFFFFFFF
elif deviceMetric == QPaintDevice.PdmDepth:
value = 32
elif deviceMetric in (
QPaintDevice.PdmPhysicalDpiX,
QPaintDevice.PdmPhysicalDpiY,
QPaintDevice.PdmDpiY,
QPaintDevice.PdmDpiX,
):
value = 72
elif deviceMetric == QPaintDevice.PdmWidthMM:
value = round(
self.metric(QPaintDevice.PdmWidth)
* 25.4
/ self.metric(QPaintDevice.PdmDpiX)
)
elif deviceMetric == QPaintDevice.PdmHeightMM:
value = round(
self.metric(QPaintDevice.PdmHeight)
* 25.4
/ self.metric(QPaintDevice.PdmDpiY)
)
else:
value = 0
return value
def drawRects(self, rects, rectCount):
pass
def drawLines(self, lines, lineCount):
pass
def drawEllipse(self, rect):
pass
def drawPath(self, path):
pass
def drawPoints(self, points, pointCount):
pass
def drawPolygon(self, points, pointCount, mode):
pass
def drawPixmap(self, rect, pm, subRect):
pass
def drawTextItem(self, pos, textItem):
pass
def drawTiledPixmap(self, rect, pm, subRect):
pass
def drawImage(self, rect, image, subRect, flags):
pass
def updateState(self, state):
pass
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