83 lines
3.5 KiB
Python
83 lines
3.5 KiB
Python
from .Exporter import Exporter
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from pyqtgraph.parametertree import Parameter
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from pyqtgraph.Qt import QtGui, QtCore, QtSvg
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import pyqtgraph as pg
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import numpy as np
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__all__ = ['ImageExporter']
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class ImageExporter(Exporter):
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Name = "Image File (PNG, TIF, JPG, ...)"
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def __init__(self, item):
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Exporter.__init__(self, item)
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tr = self.getTargetRect()
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if isinstance(item, QtGui.QGraphicsItem):
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scene = item.scene()
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else:
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scene = item
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bg = scene.views()[0].backgroundBrush().color()
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self.params = Parameter(name='params', type='group', children=[
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{'name': 'width', 'type': 'int', 'value': tr.width(), 'limits': (0, None)},
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{'name': 'height', 'type': 'int', 'value': tr.height(), 'limits': (0, None)},
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{'name': 'antialias', 'type': 'bool', 'value': True},
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{'name': 'background', 'type': 'color', 'value': bg},
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])
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self.params.param('width').sigValueChanged.connect(self.widthChanged)
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self.params.param('height').sigValueChanged.connect(self.heightChanged)
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def widthChanged(self):
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sr = self.getSourceRect()
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ar = float(sr.height()) / sr.width()
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self.params.param('height').setValue(self.params['width'] * ar, blockSignal=self.heightChanged)
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def heightChanged(self):
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sr = self.getSourceRect()
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ar = float(sr.width()) / sr.height()
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self.params.param('width').setValue(self.params['height'] * ar, blockSignal=self.widthChanged)
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def parameters(self):
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return self.params
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def export(self, fileName=None):
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if fileName is None:
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filter = ["*."+str(f) for f in QtGui.QImageWriter.supportedImageFormats()]
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preferred = ['*.png', '*.tif', '*.jpg']
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for p in preferred[::-1]:
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if p in filter:
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filter.remove(p)
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filter.insert(0, p)
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self.fileSaveDialog(filter=filter)
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return
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targetRect = QtCore.QRect(0, 0, self.params['width'], self.params['height'])
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sourceRect = self.getSourceRect()
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#self.png = QtGui.QImage(targetRect.size(), QtGui.QImage.Format_ARGB32)
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#self.png.fill(pyqtgraph.mkColor(self.params['background']))
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bg = np.empty((self.params['width'], self.params['height'], 4), dtype=np.ubyte)
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color = self.params['background']
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bg[:,:,0] = color.blue()
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bg[:,:,1] = color.green()
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bg[:,:,2] = color.red()
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bg[:,:,3] = color.alpha()
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self.png = pg.makeQImage(bg, alpha=True)
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## set resolution of image:
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origTargetRect = self.getTargetRect()
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resolutionScale = targetRect.width() / origTargetRect.width()
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#self.png.setDotsPerMeterX(self.png.dotsPerMeterX() * resolutionScale)
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#self.png.setDotsPerMeterY(self.png.dotsPerMeterY() * resolutionScale)
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painter = QtGui.QPainter(self.png)
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#dtr = painter.deviceTransform()
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try:
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self.setExportMode(True, {'antialias': self.params['antialias'], 'background': self.params['background'], 'painter': painter, 'resolutionScale': resolutionScale})
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painter.setRenderHint(QtGui.QPainter.Antialiasing, self.params['antialias'])
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self.getScene().render(painter, QtCore.QRectF(targetRect), QtCore.QRectF(sourceRect))
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finally:
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self.setExportMode(False)
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painter.end()
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self.png.save(fileName)
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