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scanwidget: apply changes as of 10439cb
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@ -1,9 +1,14 @@
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import logging
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from PyQt5 import QtGui, QtCore, QtWidgets
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from numpy import linspace
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from .ticker import Ticker
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logger = logging.getLogger(__name__)
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class ScanAxis(QtWidgets.QWidget):
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sigZoom = QtCore.pyqtSignal(float, int)
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sigPoints = QtCore.pyqtSignal(int)
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@ -52,6 +57,10 @@ class ScanAxis(QtWidgets.QWidget):
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if y:
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if ev.modifiers() & QtCore.Qt.ShiftModifier:
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# If shift+scroll, modify number of points.
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# TODO: This is not perfect. For high-resolution touchpads you
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# get many small events with y < 120 which should accumulate.
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# That would also match the wheel behavior of an integer
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# spinbox.
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z = int(y / 120.)
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self.sigPoints.emit(z)
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else:
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@ -319,14 +328,14 @@ class ScanProxy(QtCore.QObject):
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sigStopMoved = QtCore.pyqtSignal(float)
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sigNumPoints = QtCore.pyqtSignal(int)
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def __init__(self, slider, axis, rangeFactor, dynamicRange):
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def __init__(self, slider, axis, zoomMargin, dynamicRange):
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QtCore.QObject.__init__(self)
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self.axis = axis
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self.slider = slider
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self.realStart = 0
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self.realStop = 0
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self.numPoints = 10
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self.rangeFactor = rangeFactor
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self.zoomMargin = zoomMargin
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self.dynamicRange = dynamicRange
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# Transform that maps the spinboxes to a pixel position on the
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@ -335,13 +344,13 @@ class ScanProxy(QtCore.QObject):
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# Because the axis's width will change when placed within a layout,
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# the realToPixelTransform will initially be invalid. It will be set
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# properly during the first resizeEvent, with the below transform.
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self.realToPixelTransform = self.axis.width()/2, 1.
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self.realToPixelTransform = -self.axis.width()/2, 1.
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self.invalidOldSizeExpected = True
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# pixel vals for sliders: 0 to slider_width - 1
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def realToPixel(self, val):
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a, b = self.realToPixelTransform
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rawVal = b*(val + a)
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rawVal = b*(val - a)
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# Clamp pixel values to 32 bits, b/c Qt will otherwise wrap values.
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rawVal = min(max(-(1 << 31), rawVal), (1 << 31) - 1)
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return rawVal
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@ -349,7 +358,7 @@ class ScanProxy(QtCore.QObject):
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# Get a point from pixel units to what the sliders display.
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def pixelToReal(self, val):
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a, b = self.realToPixelTransform
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return val/b - a
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return val/b + a
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def rangeToReal(self, val):
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pixelVal = self.slider.rangeValueToPixelPos(val)
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@ -387,26 +396,22 @@ class ScanProxy(QtCore.QObject):
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def handleZoom(self, zoomFactor, mouseXPos):
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newScale = self.realToPixelTransform[1] * zoomFactor
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refReal = self.pixelToReal(mouseXPos)
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newLeft = mouseXPos/newScale - refReal
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if abs(newLeft*newScale) > self.dynamicRange:
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newLeft = refReal - mouseXPos/newScale
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newZero = newLeft*newScale + self.slider.effectiveWidth()/2
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if zoomFactor > 1 and abs(newZero) > self.dynamicRange:
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return
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self.realToPixelTransform = newLeft, newScale
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self.moveStop(self.realStop)
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self.moveStart(self.realStart)
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def zoomToFit(self):
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currRangeReal = abs(self.realStop - self.realStart)
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# Slider closest to the left should be used to find the new axis left.
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if self.realStop < self.realStart:
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refSlider = self.realStop
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else:
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refSlider = self.realStart
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if self.rangeFactor <= 2 or currRangeReal == 0:
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return # Ill-formed snap range- do nothing
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proportion = self.rangeFactor/(self.rangeFactor - 2)
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newScale = self.slider.effectiveWidth()/(proportion*currRangeReal)
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newLeft = (self.slider.effectiveWidth()/(self.rangeFactor*newScale) -
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refSlider)
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def viewRange(self):
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newScale = self.slider.effectiveWidth()/abs(
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self.realStop - self.realStart)
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newScale *= 1 - 2*self.zoomMargin
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newCenter = (self.realStop + self.realStart)/2
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if newCenter:
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newScale = min(newScale, self.dynamicRange/abs(newCenter))
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newLeft = newCenter - self.slider.effectiveWidth()/2/newScale
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self.realToPixelTransform = newLeft, newScale
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self.moveStop(self.realStop)
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self.moveStart(self.realStart)
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@ -419,9 +424,9 @@ class ScanProxy(QtCore.QObject):
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# This function handles handles the slider positions. Slider and axis
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# handle its own width changes; proxy watches for axis width resizeEvent to
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# alter mapping from real to pixel space.
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def zoomToFitInit(self):
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def viewRangeInit(self):
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currRangeReal = abs(self.realStop - self.realStart)
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if self.rangeFactor <= 2 or currRangeReal == 0:
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if currRangeReal == 0:
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self.moveStop(self.realStop)
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self.moveStart(self.realStart)
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# Ill-formed snap range- move the sliders anyway,
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@ -430,15 +435,15 @@ class ScanProxy(QtCore.QObject):
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# This will force the sliders to have positions on the axis
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# which reflect the start/stop values currently set.
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else:
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self.zoomToFit()
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self.viewRange()
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# Notify spinboxes manually, since slider wasn't clicked and will
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# therefore not emit signals.
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self.sigStopMoved.emit(self.realStop)
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self.sigStartMoved.emit(self.realStart)
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def fitToView(self):
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lowRange = 1.0/self.rangeFactor
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highRange = (self.rangeFactor - 1)/self.rangeFactor
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def snapRange(self):
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lowRange = self.zoomMargin
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highRange = 1 - self.zoomMargin
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newStart = self.pixelToReal(lowRange * self.slider.effectiveWidth())
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newStop = self.pixelToReal(highRange * self.slider.effectiveWidth())
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sliderRange = self.slider.maximum() - self.slider.minimum()
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@ -463,21 +468,21 @@ class ScanProxy(QtCore.QObject):
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newWidth = ev.size().width() - self.slider.handleWidth()
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# assert refRight > oldLeft
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newScale = newWidth/(refRight - oldLeft)
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self.realToPixelTransform = -oldLeft, newScale
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self.realToPixelTransform = oldLeft, newScale
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else:
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# TODO: self.axis.width() is invalid during object
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# construction. The width will change when placed in a
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# layout WITHOUT a resizeEvent. Why?
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oldLeft = -ev.size().width()/2
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newScale = 1.0
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self.realToPixelTransform = -oldLeft, newScale
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self.realToPixelTransform = oldLeft, newScale
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# We need to reinitialize the pixel transform b/c the old width
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# of the axis is no longer valid. When we have a valid transform,
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# we can then zoomToFit based on the desired real values.
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# we can then viewRange based on the desired real values.
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# The slider handle values are invalid before this point as well;
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# we set them to the correct value here, regardless of whether
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# the slider has already resized itsef or not.
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self.zoomToFitInit()
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self.viewRangeInit()
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self.invalidOldSizeExpected = False
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# assert self.pixelToReal(0) == oldLeft, \
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# "{}, {}".format(self.pixelToReal(0), oldLeft)
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@ -493,13 +498,12 @@ class ScanWidget(QtWidgets.QWidget):
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sigStopMoved = QtCore.pyqtSignal(float)
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sigNumChanged = QtCore.pyqtSignal(int)
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def __init__(self, zoomFactor=1.05, rangeFactor=6, dynamicRange=1e8):
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def __init__(self, zoomFactor=1.05, zoomMargin=.1, dynamicRange=1e8):
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QtWidgets.QWidget.__init__(self)
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self.slider = slider = ScanSlider()
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self.axis = axis = ScanAxis(zoomFactor)
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self.proxy = ScanProxy(slider, axis, rangeFactor, dynamicRange)
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self.proxy = ScanProxy(slider, axis, zoomMargin, dynamicRange)
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axis.proxy = self.proxy
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axis.slider = slider
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slider.setMaximum(1023)
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# Layout.
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@ -524,10 +528,10 @@ class ScanWidget(QtWidgets.QWidget):
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slider.installEventFilter(axis)
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# Context menu entries
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self.zoomToFitAct = QtWidgets.QAction("&View Range", self)
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self.fitToViewAct = QtWidgets.QAction("&Snap Range", self)
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self.zoomToFitAct.triggered.connect(self.zoomToFit)
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self.fitToViewAct.triggered.connect(self.fitToView)
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self.viewRangeAct = QtWidgets.QAction("&View Range", self)
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self.snapRangeAct = QtWidgets.QAction("&Snap Range", self)
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self.viewRangeAct.triggered.connect(self.viewRange)
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self.snapRangeAct.triggered.connect(self.snapRange)
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# Spinbox and button slots. Any time the spinboxes change, ScanWidget
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# mirrors it and passes the information to the proxy.
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@ -540,14 +544,14 @@ class ScanWidget(QtWidgets.QWidget):
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def setNumPoints(self, val):
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self.proxy.setNumPoints(val)
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def zoomToFit(self):
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self.proxy.zoomToFit()
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def viewRange(self):
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self.proxy.viewRange()
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def fitToView(self):
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self.proxy.fitToView()
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def snapRange(self):
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self.proxy.snapRange()
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def contextMenuEvent(self, ev):
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menu = QtWidgets.QMenu(self)
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menu.addAction(self.zoomToFitAct)
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menu.addAction(self.fitToViewAct)
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menu.addAction(self.viewRangeAct)
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menu.addAction(self.snapRangeAct)
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menu.exec(ev.globalPos())
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