85 lines
2.9 KiB
Python
85 lines
2.9 KiB
Python
from pyqtgraph.Qt import QtCore, QtGui
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try:
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from pyqtgraph.Qt import QtOpenGL
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HAVE_OPENGL = True
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except ImportError:
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HAVE_OPENGL = False
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import pyqtgraph.functions as fn
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import numpy as np
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class RawImageWidget(QtGui.QWidget):
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"""
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Widget optimized for very fast video display.
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Generally using an ImageItem inside GraphicsView is fast enough,
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but if you need even more performance, this widget is about as fast as it gets (but only in unscaled mode).
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"""
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def __init__(self, parent=None, scaled=False):
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"""
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Setting scaled=True will cause the entire image to be displayed within the boundaries of the widget. This also greatly reduces the speed at which it will draw frames.
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"""
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QtGui.QWidget.__init__(self, parent=None)
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self.setSizePolicy(QtGui.QSizePolicy(QtGui.QSizePolicy.Expanding,QtGui.QSizePolicy.Expanding))
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self.scaled = scaled
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self.opts = None
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self.image = None
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def setImage(self, img, *args, **kargs):
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"""
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img must be ndarray of shape (x,y), (x,y,3), or (x,y,4).
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Extra arguments are sent to functions.makeARGB
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"""
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self.opts = (img, args, kargs)
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self.image = None
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self.update()
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def paintEvent(self, ev):
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if self.opts is None:
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return
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if self.image is None:
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argb, alpha = fn.makeARGB(self.opts[0], *self.opts[1], **self.opts[2])
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self.image = fn.makeQImage(argb, alpha)
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self.opts = ()
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#if self.pixmap is None:
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#self.pixmap = QtGui.QPixmap.fromImage(self.image)
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p = QtGui.QPainter(self)
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if self.scaled:
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rect = self.rect()
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ar = rect.width() / float(rect.height())
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imar = self.image.width() / float(self.image.height())
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if ar > imar:
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rect.setWidth(int(rect.width() * imar/ar))
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else:
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rect.setHeight(int(rect.height() * ar/imar))
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p.drawImage(rect, self.image)
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else:
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p.drawImage(QtCore.QPointF(), self.image)
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#p.drawPixmap(self.rect(), self.pixmap)
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p.end()
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if HAVE_OPENGL:
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class RawImageGLWidget(QtOpenGL.QGLWidget):
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"""
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Similar to RawImageWidget, but uses a GL widget to do all drawing.
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Generally this will be about as fast as using GraphicsView + ImageItem,
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but performance may vary on some platforms.
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"""
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def __init__(self, parent=None, scaled=False):
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QtOpenGL.QGLWidget.__init__(self, parent=None)
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self.scaled = scaled
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self.image = None
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def setImage(self, img):
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self.image = fn.makeQImage(img)
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self.update()
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def paintEvent(self, ev):
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if self.image is None:
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return
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p = QtGui.QPainter(self)
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p.drawImage(self.rect(), self.image)
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p.end()
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