forked from M-Labs/artiq
Merge branch 'scanwidget' (closes #128)
* scanwidget:
gui: fix scanwidget usage
scanwidget: apply changes as of 10439cb
scanwidget: apply changes as of 98f0a56
missing parts of 59ac567
scanwidget: disable unmodified wheel on axis and slider
scanwidget: wire up signals better, set values late, take scanwidget from 7aa6397
gui: use scanwidget
scanwidget: add from current git
This commit is contained in:
commit
d34d83f35c
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@ -4,6 +4,8 @@ from collections import OrderedDict
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from PyQt5 import QtCore, QtGui, QtWidgets
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from artiq.gui.tools import LayoutWidget, disable_scroll_wheel
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from artiq.gui.scanwidget import ScanWidget
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from artiq.gui.scientific_spinbox import ScientificSpinBox
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logger = logging.getLogger(__name__)
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@ -136,6 +138,7 @@ class _RangeScan(LayoutWidget):
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LayoutWidget.__init__(self)
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scale = procdesc["scale"]
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def apply_properties(spinbox):
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spinbox.setDecimals(procdesc["ndecimals"])
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if procdesc["global_min"] is not None:
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@ -151,37 +154,56 @@ class _RangeScan(LayoutWidget):
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if procdesc["unit"]:
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spinbox.setSuffix(" " + procdesc["unit"])
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self.addWidget(QtWidgets.QLabel("Min:"), 0, 0)
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self.min = QtWidgets.QDoubleSpinBox()
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self.scanner = scanner = ScanWidget()
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scanner.setMinimumSize(150, 0)
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scanner.setSizePolicy(QtWidgets.QSizePolicy(
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QtWidgets.QSizePolicy.Preferred, QtWidgets.QSizePolicy.Fixed))
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disable_scroll_wheel(scanner.axis)
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disable_scroll_wheel(scanner.slider)
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self.addWidget(scanner, 0, 0, -1, 1)
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self.min = ScientificSpinBox()
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self.min.setStyleSheet("QDoubleSpinBox {color:blue}")
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self.min.setMinimumSize(110, 0)
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self.min.setSizePolicy(QtWidgets.QSizePolicy(
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QtWidgets.QSizePolicy.Fixed, QtWidgets.QSizePolicy.Fixed))
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disable_scroll_wheel(self.min)
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apply_properties(self.min)
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self.addWidget(self.min, 0, 1)
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self.addWidget(QtWidgets.QLabel("Max:"), 1, 0)
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self.max = QtWidgets.QDoubleSpinBox()
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disable_scroll_wheel(self.max)
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apply_properties(self.max)
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self.addWidget(self.max, 1, 1)
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self.addWidget(QtWidgets.QLabel("#Points:"), 2, 0)
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self.npoints = QtWidgets.QSpinBox()
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self.npoints.setMinimum(1)
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disable_scroll_wheel(self.npoints)
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self.npoints.setMinimum(2)
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self.npoints.setValue(10)
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self.addWidget(self.npoints, 2, 1)
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self.addWidget(self.npoints, 1, 1)
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self.max = ScientificSpinBox()
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self.max.setStyleSheet("QDoubleSpinBox {color:red}")
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self.max.setMinimumSize(110, 0)
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disable_scroll_wheel(self.max)
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self.addWidget(self.max, 2, 1)
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self.min.setValue(state["min"]/scale)
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self.max.setValue(state["max"]/scale)
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self.npoints.setValue(state["npoints"])
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def update_min(value):
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state["min"] = value*scale
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scanner.setStart(value)
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def update_max(value):
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state["min"] = value*scale
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state["max"] = value*scale
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scanner.setStop(value)
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def update_npoints(value):
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state["npoints"] = value
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scanner.setNumPoints(value)
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scanner.sigStartMoved.connect(self.min.setValue)
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scanner.sigNumChanged.connect(self.npoints.setValue)
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scanner.sigStopMoved.connect(self.max.setValue)
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self.min.valueChanged.connect(update_min)
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self.max.valueChanged.connect(update_max)
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self.npoints.valueChanged.connect(update_npoints)
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self.max.valueChanged.connect(update_max)
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self.min.setValue(state["min"]/scale)
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self.npoints.setValue(state["npoints"])
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self.max.setValue(state["max"]/scale)
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apply_properties(self.min)
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apply_properties(self.max)
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class _ExplicitScan(LayoutWidget):
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@ -0,0 +1,557 @@
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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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def __init__(self, zoomFactor):
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QtWidgets.QWidget.__init__(self)
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self.proxy = None
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self.sizePolicy().setControlType(QtWidgets.QSizePolicy.ButtonBox)
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self.ticker = Ticker()
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self.zoomFactor = zoomFactor
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def paintEvent(self, ev):
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painter = QtGui.QPainter(self)
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font = painter.font()
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avgCharWidth = QtGui.QFontMetrics(font).averageCharWidth()
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painter.setRenderHint(QtGui.QPainter.Antialiasing)
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# The center of the slider handles should reflect what's displayed
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# on the spinboxes.
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painter.translate(self.proxy.slider.handleWidth()/2, self.height() - 5)
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painter.drawLine(0, 0, self.width(), 0)
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realLeft = self.proxy.pixelToReal(0)
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realRight = self.proxy.pixelToReal(self.width())
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ticks, prefix, labels = self.ticker(realLeft, realRight)
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painter.drawText(0, -25, prefix)
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pen = QtGui.QPen()
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pen.setWidth(2)
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painter.setPen(pen)
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for t, l in zip(ticks, labels):
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t = self.proxy.realToPixel(t)
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painter.drawLine(t, 0, t, -5)
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painter.drawText(t - len(l)/2*avgCharWidth, -10, l)
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sliderStartPixel = self.proxy.realToPixel(self.proxy.realStart)
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sliderStopPixel = self.proxy.realToPixel(self.proxy.realStop)
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pixels = linspace(sliderStartPixel, sliderStopPixel,
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self.proxy.numPoints)
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for p in pixels:
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p_int = int(p)
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painter.drawLine(p_int, 0, p_int, 5)
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ev.accept()
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def wheelEvent(self, ev):
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y = ev.angleDelta().y()
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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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z = self.zoomFactor**(y / 120.)
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# Remove the slider-handle shift correction, b/c none of the
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# other widgets know about it. If we have the mouse directly
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# over a tick during a zoom, it should appear as if we are
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# doing zoom relative to the ticks which live in axis
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# pixel-space, not slider pixel-space.
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self.sigZoom.emit(
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z, ev.x() - self.proxy.slider.handleWidth()/2)
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self.update()
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ev.accept()
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def eventFilter(self, obj, ev):
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if obj is not self.proxy.slider:
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return False
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if ev.type() != QtCore.QEvent.Wheel:
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return False
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self.wheelEvent(ev)
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return True
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# Basic ideas from https://gist.github.com/Riateche/27e36977f7d5ea72cf4f
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class ScanSlider(QtWidgets.QSlider):
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sigStartMoved = QtCore.pyqtSignal(int)
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sigStopMoved = QtCore.pyqtSignal(int)
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def __init__(self):
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QtWidgets.QSlider.__init__(self, QtCore.Qt.Horizontal)
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self.startPos = 0 # Pos and Val can differ in event handling.
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# perhaps prevPos and currPos is more accurate.
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self.stopPos = 99
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self.startVal = 0 # lower
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self.stopVal = 99 # upper
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self.offset = 0
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self.position = 0
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self.upperPressed = QtWidgets.QStyle.SC_None
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self.lowerPressed = QtWidgets.QStyle.SC_None
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self.firstMovement = False # State var for handling slider overlap.
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self.blockTracking = False
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# We need fake sliders to keep around so that we can dynamically
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# set the stylesheets for drawing each slider later. See paintEvent.
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self.dummyStartSlider = QtWidgets.QSlider()
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self.dummyStopSlider = QtWidgets.QSlider()
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self.dummyStartSlider.setStyleSheet(
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"QSlider::handle {background:blue}")
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self.dummyStopSlider.setStyleSheet(
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"QSlider::handle {background:red}")
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# We basically superimpose two QSliders on top of each other, discarding
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# the state that remains constant between the two when drawing.
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# Everything except the handles remain constant.
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def initHandleStyleOption(self, opt, handle):
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self.initStyleOption(opt)
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if handle == "start":
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opt.sliderPosition = self.startPos
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opt.sliderValue = self.startVal
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elif handle == "stop":
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opt.sliderPosition = self.stopPos
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opt.sliderValue = self.stopVal
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# We get the range of each slider separately.
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def pixelPosToRangeValue(self, pos):
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opt = QtWidgets.QStyleOptionSlider()
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self.initStyleOption(opt)
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gr = self.style().subControlRect(QtWidgets.QStyle.CC_Slider, opt,
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QtWidgets.QStyle.SC_SliderGroove,
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self)
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rangeVal = QtWidgets.QStyle.sliderValueFromPosition(
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self.minimum(), self.maximum(), pos - gr.x(),
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self.effectiveWidth(), opt.upsideDown)
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return rangeVal
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def rangeValueToPixelPos(self, val):
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opt = QtWidgets.QStyleOptionSlider()
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self.initStyleOption(opt)
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pixel = QtWidgets.QStyle.sliderPositionFromValue(
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self.minimum(), self.maximum(), val, self.effectiveWidth(),
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opt.upsideDown)
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return pixel
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# When calculating conversions to/from pixel space, not all of the slider's
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# width is actually usable, because the slider handle has a nonzero width.
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# We use this function as a helper when the axis needs slider information.
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def handleWidth(self):
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opt = QtWidgets.QStyleOptionSlider()
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self.initStyleOption(opt)
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sr = self.style().subControlRect(QtWidgets.QStyle.CC_Slider, opt,
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QtWidgets.QStyle.SC_SliderHandle,
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self)
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return sr.width()
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def effectiveWidth(self):
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opt = QtWidgets.QStyleOptionSlider()
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self.initStyleOption(opt)
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gr = self.style().subControlRect(QtWidgets.QStyle.CC_Slider, opt,
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QtWidgets.QStyle.SC_SliderGroove,
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self)
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return gr.width() - self.handleWidth()
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def handleMousePress(self, pos, control, val, handle):
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opt = QtWidgets.QStyleOptionSlider()
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self.initHandleStyleOption(opt, handle)
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startAtEdges = (handle == "start" and
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(self.startVal == self.minimum() or
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self.startVal == self.maximum()))
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stopAtEdges = (handle == "stop" and
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(self.stopVal == self.minimum() or
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self.stopVal == self.maximum()))
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# If chosen slider at edge, treat it as non-interactive.
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if startAtEdges or stopAtEdges:
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return QtWidgets.QStyle.SC_None
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oldControl = control
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control = self.style().hitTestComplexControl(
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QtWidgets.QStyle.CC_Slider, opt, pos, self)
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sr = self.style().subControlRect(QtWidgets.QStyle.CC_Slider, opt,
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QtWidgets.QStyle.SC_SliderHandle,
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self)
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if control == QtWidgets.QStyle.SC_SliderHandle:
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# no pick()- slider orientation static
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self.offset = pos.x() - sr.topLeft().x()
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self.setSliderDown(True)
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# emit
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# Needed?
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if control != oldControl:
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self.update(sr)
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return control
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def drawHandle(self, painter, handle):
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opt = QtWidgets.QStyleOptionSlider()
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self.initStyleOption(opt)
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self.initHandleStyleOption(opt, handle)
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opt.subControls = QtWidgets.QStyle.SC_SliderHandle
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painter.drawComplexControl(QtWidgets.QStyle.CC_Slider, opt)
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# def triggerAction(self, action, slider):
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# if action == QtWidgets.QAbstractSlider.SliderSingleStepAdd:
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# if
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def setSpan(self, low, high):
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# TODO: Is this necessary? QStyle::sliderPositionFromValue appears
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# to clamp already.
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low = min(max(self.minimum(), low), self.maximum())
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high = min(max(self.minimum(), high), self.maximum())
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if low != self.startVal or high != self.stopVal:
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if low != self.startVal:
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self.startVal = low
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self.startPos = low
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if high != self.stopVal:
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self.stopVal = high
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self.stopPos = high
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self.update()
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def setStartPosition(self, val):
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if val != self.startPos:
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self.startPos = val
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if not self.hasTracking():
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self.update()
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if self.isSliderDown():
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self.sigStartMoved.emit(self.startPos)
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if self.hasTracking() and not self.blockTracking:
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self.setSpan(self.startPos, self.stopVal)
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def setStopPosition(self, val):
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if val != self.stopPos:
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self.stopPos = val
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if not self.hasTracking():
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self.update()
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if self.isSliderDown():
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self.sigStopMoved.emit(self.stopPos)
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if self.hasTracking() and not self.blockTracking:
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self.setSpan(self.startVal, self.stopPos)
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def mousePressEvent(self, ev):
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if self.minimum() == self.maximum() or (ev.buttons() ^ ev.button()):
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ev.ignore()
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return
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# Prefer stopVal in the default case.
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self.upperPressed = self.handleMousePress(
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ev.pos(), self.upperPressed, self.stopVal, "stop")
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if self.upperPressed != QtWidgets.QStyle.SC_SliderHandle:
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self.lowerPressed = self.handleMousePress(
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ev.pos(), self.upperPressed, self.startVal, "start")
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# State that is needed to handle the case where two sliders are equal.
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self.firstMovement = True
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ev.accept()
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def mouseMoveEvent(self, ev):
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if (self.lowerPressed != QtWidgets.QStyle.SC_SliderHandle and
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self.upperPressed != QtWidgets.QStyle.SC_SliderHandle):
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ev.ignore()
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return
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opt = QtWidgets.QStyleOptionSlider()
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self.initStyleOption(opt)
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# This code seems to be needed so that returning the slider to the
|
||||
# previous position is honored if a drag distance is exceeded.
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m = self.style().pixelMetric(QtWidgets.QStyle.PM_MaximumDragDistance,
|
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opt, self)
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newPos = self.pixelPosToRangeValue(ev.pos().x() - self.offset)
|
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|
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if m >= 0:
|
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r = self.rect().adjusted(-m, -m, m, m)
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if not r.contains(ev.pos()):
|
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newPos = self.position
|
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|
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if self.firstMovement:
|
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if self.startPos == self.stopPos:
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# StopSlider is preferred, except in the case where
|
||||
# start == max possible value the slider can take.
|
||||
if self.startPos == self.maximum():
|
||||
self.lowerPressed = QtWidgets.QStyle.SC_SliderHandle
|
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self.upperPressed = QtWidgets.QStyle.SC_None
|
||||
self.firstMovement = False
|
||||
|
||||
if self.lowerPressed == QtWidgets.QStyle.SC_SliderHandle:
|
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self.setStartPosition(newPos)
|
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|
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if self.upperPressed == QtWidgets.QStyle.SC_SliderHandle:
|
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self.setStopPosition(newPos)
|
||||
|
||||
ev.accept()
|
||||
|
||||
def mouseReleaseEvent(self, ev):
|
||||
QtWidgets.QSlider.mouseReleaseEvent(self, ev)
|
||||
self.setSliderDown(False) # AbstractSlider needs this
|
||||
self.lowerPressed = QtWidgets.QStyle.SC_None
|
||||
self.upperPressed = QtWidgets.QStyle.SC_None
|
||||
|
||||
def paintEvent(self, ev):
|
||||
# Use QStylePainters to make redrawing as painless as possible.
|
||||
# Paint on the custom widget, using the attributes of the fake
|
||||
# slider references we keep around. setStyleSheet within paintEvent
|
||||
# leads to heavy performance penalties (and recursion?).
|
||||
# QPalettes would be nicer to use, since palette entries can be set
|
||||
# individually for each slider handle, but Windows 7 does not
|
||||
# use them. This seems to be the only way to override the colors
|
||||
# regardless of platform.
|
||||
startPainter = QtWidgets.QStylePainter(self, self.dummyStartSlider)
|
||||
stopPainter = QtWidgets.QStylePainter(self, self.dummyStopSlider)
|
||||
|
||||
# Handles
|
||||
# Qt will snap sliders to 0 or maximum() if given a desired pixel
|
||||
# location outside the mapped range. So we manually just don't draw
|
||||
# the handles if they are at 0 or max.
|
||||
if self.startVal > 0 and self.startVal < self.maximum():
|
||||
self.drawHandle(startPainter, "start")
|
||||
if self.stopVal > 0 and self.stopVal < self.maximum():
|
||||
self.drawHandle(stopPainter, "stop")
|
||||
|
||||
|
||||
# real (Sliders) => pixel (one pixel movement of sliders would increment by X)
|
||||
# => range (minimum granularity that sliders understand).
|
||||
class ScanProxy(QtCore.QObject):
|
||||
sigStartMoved = QtCore.pyqtSignal(float)
|
||||
sigStopMoved = QtCore.pyqtSignal(float)
|
||||
sigNumPoints = QtCore.pyqtSignal(int)
|
||||
|
||||
def __init__(self, slider, axis, zoomMargin, dynamicRange):
|
||||
QtCore.QObject.__init__(self)
|
||||
self.axis = axis
|
||||
self.slider = slider
|
||||
self.realStart = 0
|
||||
self.realStop = 0
|
||||
self.numPoints = 10
|
||||
self.zoomMargin = zoomMargin
|
||||
self.dynamicRange = dynamicRange
|
||||
|
||||
# Transform that maps the spinboxes to a pixel position on the
|
||||
# axis. 0 to axis.width() exclusive indicate positions which will be
|
||||
# displayed on the axis.
|
||||
# Because the axis's width will change when placed within a layout,
|
||||
# the realToPixelTransform will initially be invalid. It will be set
|
||||
# properly during the first resizeEvent, with the below transform.
|
||||
self.realToPixelTransform = -self.axis.width()/2, 1.
|
||||
self.invalidOldSizeExpected = True
|
||||
|
||||
# pixel vals for sliders: 0 to slider_width - 1
|
||||
def realToPixel(self, val):
|
||||
a, b = self.realToPixelTransform
|
||||
rawVal = b*(val - a)
|
||||
# Clamp pixel values to 32 bits, b/c Qt will otherwise wrap values.
|
||||
rawVal = min(max(-(1 << 31), rawVal), (1 << 31) - 1)
|
||||
return rawVal
|
||||
|
||||
# Get a point from pixel units to what the sliders display.
|
||||
def pixelToReal(self, val):
|
||||
a, b = self.realToPixelTransform
|
||||
return val/b + a
|
||||
|
||||
def rangeToReal(self, val):
|
||||
pixelVal = self.slider.rangeValueToPixelPos(val)
|
||||
return self.pixelToReal(pixelVal)
|
||||
|
||||
def realToRange(self, val):
|
||||
pixelVal = self.realToPixel(val)
|
||||
return self.slider.pixelPosToRangeValue(pixelVal)
|
||||
|
||||
def moveStop(self, val):
|
||||
sliderX = self.realToRange(val)
|
||||
self.slider.setStopPosition(sliderX)
|
||||
self.realStop = val
|
||||
self.axis.update() # Number of points ticks changed positions.
|
||||
|
||||
def moveStart(self, val):
|
||||
sliderX = self.realToRange(val)
|
||||
self.slider.setStartPosition(sliderX)
|
||||
self.realStart = val
|
||||
self.axis.update()
|
||||
|
||||
def handleStopMoved(self, rangeVal):
|
||||
self.sigStopMoved.emit(self.rangeToReal(rangeVal))
|
||||
|
||||
def handleStartMoved(self, rangeVal):
|
||||
self.sigStartMoved.emit(self.rangeToReal(rangeVal))
|
||||
|
||||
def handleNumPoints(self, inc):
|
||||
self.sigNumPoints.emit(self.numPoints + inc)
|
||||
|
||||
def setNumPoints(self, val):
|
||||
self.numPoints = val
|
||||
self.axis.update()
|
||||
|
||||
def handleZoom(self, zoomFactor, mouseXPos):
|
||||
newScale = self.realToPixelTransform[1] * zoomFactor
|
||||
refReal = self.pixelToReal(mouseXPos)
|
||||
newLeft = refReal - mouseXPos/newScale
|
||||
newZero = newLeft*newScale + self.slider.effectiveWidth()/2
|
||||
if zoomFactor > 1 and abs(newZero) > self.dynamicRange:
|
||||
return
|
||||
self.realToPixelTransform = newLeft, newScale
|
||||
self.moveStop(self.realStop)
|
||||
self.moveStart(self.realStart)
|
||||
|
||||
def viewRange(self):
|
||||
newScale = self.slider.effectiveWidth()/abs(
|
||||
self.realStop - self.realStart)
|
||||
newScale *= 1 - 2*self.zoomMargin
|
||||
newCenter = (self.realStop + self.realStart)/2
|
||||
if newCenter:
|
||||
newScale = min(newScale, self.dynamicRange/abs(newCenter))
|
||||
newLeft = newCenter - self.slider.effectiveWidth()/2/newScale
|
||||
self.realToPixelTransform = newLeft, newScale
|
||||
self.moveStop(self.realStop)
|
||||
self.moveStart(self.realStart)
|
||||
self.axis.update() # Axis normally takes care to update itself during
|
||||
# zoom. In this code path however, the zoom didn't arrive via the axis
|
||||
# widget, so we need to notify manually.
|
||||
|
||||
# This function is called if the axis width, slider width, and slider
|
||||
# positions are in an inconsistent state, to initialize the widget.
|
||||
# This function handles handles the slider positions. Slider and axis
|
||||
# handle its own width changes; proxy watches for axis width resizeEvent to
|
||||
# alter mapping from real to pixel space.
|
||||
def viewRangeInit(self):
|
||||
currRangeReal = abs(self.realStop - self.realStart)
|
||||
if currRangeReal == 0:
|
||||
self.moveStop(self.realStop)
|
||||
self.moveStart(self.realStart)
|
||||
# Ill-formed snap range- move the sliders anyway,
|
||||
# because we arrived here during widget
|
||||
# initialization, where the slider positions are likely invalid.
|
||||
# This will force the sliders to have positions on the axis
|
||||
# which reflect the start/stop values currently set.
|
||||
else:
|
||||
self.viewRange()
|
||||
# Notify spinboxes manually, since slider wasn't clicked and will
|
||||
# therefore not emit signals.
|
||||
self.sigStopMoved.emit(self.realStop)
|
||||
self.sigStartMoved.emit(self.realStart)
|
||||
|
||||
def snapRange(self):
|
||||
lowRange = self.zoomMargin
|
||||
highRange = 1 - self.zoomMargin
|
||||
newStart = self.pixelToReal(lowRange * self.slider.effectiveWidth())
|
||||
newStop = self.pixelToReal(highRange * self.slider.effectiveWidth())
|
||||
sliderRange = self.slider.maximum() - self.slider.minimum()
|
||||
# Signals won't fire unless slider was actually grabbed, so
|
||||
# manually update so the spinboxes know that knew values were set.
|
||||
# self.realStop/Start and the sliders themselves will be updated as a
|
||||
# consequence of ValueChanged signal in spinboxes. The slider widget
|
||||
# has guards against recursive signals in setSpan().
|
||||
if sliderRange > 0:
|
||||
self.sigStopMoved.emit(newStop)
|
||||
self.sigStartMoved.emit(newStart)
|
||||
|
||||
def eventFilter(self, obj, ev):
|
||||
if obj != self.axis:
|
||||
return False
|
||||
if ev.type() != QtCore.QEvent.Resize:
|
||||
return False
|
||||
if ev.oldSize().isValid():
|
||||
oldLeft = self.pixelToReal(0)
|
||||
refWidth = ev.oldSize().width() - self.slider.handleWidth()
|
||||
refRight = self.pixelToReal(refWidth)
|
||||
newWidth = ev.size().width() - self.slider.handleWidth()
|
||||
# assert refRight > oldLeft
|
||||
newScale = newWidth/(refRight - oldLeft)
|
||||
self.realToPixelTransform = oldLeft, newScale
|
||||
else:
|
||||
# TODO: self.axis.width() is invalid during object
|
||||
# construction. The width will change when placed in a
|
||||
# layout WITHOUT a resizeEvent. Why?
|
||||
oldLeft = -ev.size().width()/2
|
||||
newScale = 1.0
|
||||
self.realToPixelTransform = oldLeft, newScale
|
||||
# We need to reinitialize the pixel transform b/c the old width
|
||||
# of the axis is no longer valid. When we have a valid transform,
|
||||
# we can then viewRange based on the desired real values.
|
||||
# The slider handle values are invalid before this point as well;
|
||||
# we set them to the correct value here, regardless of whether
|
||||
# the slider has already resized itsef or not.
|
||||
self.viewRangeInit()
|
||||
self.invalidOldSizeExpected = False
|
||||
# assert self.pixelToReal(0) == oldLeft, \
|
||||
# "{}, {}".format(self.pixelToReal(0), oldLeft)
|
||||
# Slider will update independently, making sure that the old
|
||||
# slider positions are preserved. Because of this, we can be
|
||||
# confident that the new slider position will still map to the
|
||||
# same positions in the new axis-space.
|
||||
return False
|
||||
|
||||
|
||||
class ScanWidget(QtWidgets.QWidget):
|
||||
sigStartMoved = QtCore.pyqtSignal(float)
|
||||
sigStopMoved = QtCore.pyqtSignal(float)
|
||||
sigNumChanged = QtCore.pyqtSignal(int)
|
||||
|
||||
def __init__(self, zoomFactor=1.05, zoomMargin=.1, dynamicRange=1e8):
|
||||
QtWidgets.QWidget.__init__(self)
|
||||
self.slider = slider = ScanSlider()
|
||||
self.axis = axis = ScanAxis(zoomFactor)
|
||||
self.proxy = ScanProxy(slider, axis, zoomMargin, dynamicRange)
|
||||
axis.proxy = self.proxy
|
||||
slider.setMaximum(1023)
|
||||
|
||||
# Layout.
|
||||
layout = QtWidgets.QGridLayout()
|
||||
# Default size will cause axis to disappear otherwise.
|
||||
layout.setRowMinimumHeight(0, 40)
|
||||
layout.addWidget(axis, 0, 0, 1, -1)
|
||||
layout.addWidget(slider, 1, 0, 1, -1)
|
||||
self.setLayout(layout)
|
||||
|
||||
# Connect signals (minus context menu)
|
||||
slider.sigStopMoved.connect(self.proxy.handleStopMoved)
|
||||
slider.sigStartMoved.connect(self.proxy.handleStartMoved)
|
||||
self.proxy.sigStopMoved.connect(self.sigStopMoved)
|
||||
self.proxy.sigStartMoved.connect(self.sigStartMoved)
|
||||
self.proxy.sigNumPoints.connect(self.sigNumChanged)
|
||||
axis.sigZoom.connect(self.proxy.handleZoom)
|
||||
axis.sigPoints.connect(self.proxy.handleNumPoints)
|
||||
|
||||
# Connect event observers.
|
||||
axis.installEventFilter(self.proxy)
|
||||
slider.installEventFilter(axis)
|
||||
|
||||
# Context menu entries
|
||||
self.viewRangeAct = QtWidgets.QAction("&View Range", self)
|
||||
self.snapRangeAct = QtWidgets.QAction("&Snap Range", self)
|
||||
self.viewRangeAct.triggered.connect(self.viewRange)
|
||||
self.snapRangeAct.triggered.connect(self.snapRange)
|
||||
|
||||
# Spinbox and button slots. Any time the spinboxes change, ScanWidget
|
||||
# mirrors it and passes the information to the proxy.
|
||||
def setStop(self, val):
|
||||
self.proxy.moveStop(val)
|
||||
|
||||
def setStart(self, val):
|
||||
self.proxy.moveStart(val)
|
||||
|
||||
def setNumPoints(self, val):
|
||||
self.proxy.setNumPoints(val)
|
||||
|
||||
def viewRange(self):
|
||||
self.proxy.viewRange()
|
||||
|
||||
def snapRange(self):
|
||||
self.proxy.snapRange()
|
||||
|
||||
def contextMenuEvent(self, ev):
|
||||
menu = QtWidgets.QMenu(self)
|
||||
menu.addAction(self.viewRangeAct)
|
||||
menu.addAction(self.snapRangeAct)
|
||||
menu.exec(ev.globalPos())
|
||||
|
|
@ -0,0 +1,71 @@
|
|||
import re
|
||||
from PyQt5 import QtGui, QtWidgets
|
||||
|
||||
# after
|
||||
# http://jdreaver.com/posts/2014-07-28-scientific-notation-spin-box-pyside.html
|
||||
|
||||
|
||||
_inf = float("inf")
|
||||
# Regular expression to find floats. Match groups are the whole string, the
|
||||
# whole coefficient, the decimal part of the coefficient, and the exponent
|
||||
# part.
|
||||
_float_re = re.compile(r"(([+-]?\d+(\.\d*)?|\.\d+)([eE][+-]?\d+)?)")
|
||||
|
||||
|
||||
def valid_float_string(string):
|
||||
match = _float_re.search(string)
|
||||
if match:
|
||||
return match.groups()[0] == string
|
||||
return False
|
||||
|
||||
|
||||
class FloatValidator(QtGui.QValidator):
|
||||
def validate(self, string, position):
|
||||
if valid_float_string(string):
|
||||
return self.Acceptable, string, position
|
||||
if string == "" or string[position-1] in "eE.-+":
|
||||
return self.Intermediate, string, position
|
||||
return self.Invalid, string, position
|
||||
|
||||
def fixup(self, text):
|
||||
match = _float_re.search(text)
|
||||
if match:
|
||||
return match.groups()[0]
|
||||
return ""
|
||||
|
||||
|
||||
class ScientificSpinBox(QtWidgets.QDoubleSpinBox):
|
||||
def __init__(self, *args, **kwargs):
|
||||
super().__init__(*args, **kwargs)
|
||||
self.setMinimum(-_inf)
|
||||
self.setMaximum(_inf)
|
||||
self.validator = FloatValidator()
|
||||
self.setDecimals(20)
|
||||
|
||||
def validate(self, text, position):
|
||||
return self.validator.validate(text, position)
|
||||
|
||||
def fixup(self, text):
|
||||
return self.validator.fixup(text)
|
||||
|
||||
def valueFromText(self, text):
|
||||
return float(text)
|
||||
|
||||
def textFromValue(self, value):
|
||||
return format_float(value)
|
||||
|
||||
def stepBy(self, steps):
|
||||
text = self.cleanText()
|
||||
groups = _float_re.search(text).groups()
|
||||
decimal = float(groups[1])
|
||||
decimal += steps
|
||||
new_string = "{:g}".format(decimal) + (groups[3] if groups[3] else "")
|
||||
self.lineEdit().setText(new_string)
|
||||
|
||||
|
||||
def format_float(value):
|
||||
"""Modified form of the 'g' format specifier."""
|
||||
string = "{:g}".format(value)
|
||||
string = string.replace("e+", "e")
|
||||
string = re.sub("e(-?)0*(\d+)", r"e\1\2", string)
|
||||
return string
|
||||
|
|
@ -0,0 +1,136 @@
|
|||
# Robert Jordens <rj@m-labs.hk>, 2016
|
||||
|
||||
import numpy as np
|
||||
|
||||
|
||||
class Ticker:
|
||||
# TODO: if this turns out to be computationally expensive, then refactor
|
||||
# such that the log()s and intermediate values are reused. But
|
||||
# probably the string formatting itself is the limiting factor here.
|
||||
def __init__(self, min_ticks=3, precision=3, steps=(5, 2, 1, .5)):
|
||||
"""
|
||||
min_ticks: minimum number of ticks to generate
|
||||
The maximum number of ticks is
|
||||
max(consecutive ratios in steps)*min_ticks
|
||||
thus 5/2*min_ticks for default steps.
|
||||
precision: maximum number of significant digits in labels
|
||||
Also extract common offset and magnitude from ticks
|
||||
if dynamic range exceeds precision number of digits
|
||||
(small range on top of large offset).
|
||||
steps: tick increments at a given magnitude
|
||||
The .5 catches rounding errors where the calculation
|
||||
of step_magnitude falls into the wrong exponent bin.
|
||||
"""
|
||||
self.min_ticks = min_ticks
|
||||
self.precision = precision
|
||||
self.steps = steps
|
||||
|
||||
def step(self, i):
|
||||
"""
|
||||
Return recommended step value for interval size `i`.
|
||||
"""
|
||||
if not i:
|
||||
raise ValueError("Need a finite interval")
|
||||
step = i/self.min_ticks # rational step size for min_ticks
|
||||
step_magnitude = 10**np.floor(np.log10(step))
|
||||
# underlying magnitude for steps
|
||||
for m in self.steps:
|
||||
good_step = m*step_magnitude
|
||||
if good_step <= step:
|
||||
return good_step
|
||||
|
||||
def ticks(self, a, b):
|
||||
"""
|
||||
Return recommended tick values for interval `[a, b[`.
|
||||
"""
|
||||
step = self.step(b - a)
|
||||
a0 = np.ceil(a/step)*step
|
||||
ticks = np.arange(a0, b, step)
|
||||
return ticks
|
||||
|
||||
def offset(self, a, step):
|
||||
"""
|
||||
Find offset if dynamic range of the interval is large
|
||||
(small range on large offset).
|
||||
|
||||
If offset is finite, show `offset + value`.
|
||||
"""
|
||||
if a == 0.:
|
||||
return 0.
|
||||
la = np.floor(np.log10(abs(a)))
|
||||
lr = np.floor(np.log10(step))
|
||||
if la - lr < self.precision:
|
||||
return 0.
|
||||
magnitude = 10**(lr - 1 + self.precision)
|
||||
offset = np.floor(a/magnitude)*magnitude
|
||||
return offset
|
||||
|
||||
def magnitude(self, a, b, step):
|
||||
"""
|
||||
Determine the scaling magnitude.
|
||||
|
||||
If magnitude differs from unity, show `magnitude * value`.
|
||||
This depends on proper offsetting by `offset()`.
|
||||
"""
|
||||
v = np.floor(np.log10(max(abs(a), abs(b))))
|
||||
w = np.floor(np.log10(step))
|
||||
if v < self.precision and w > -self.precision:
|
||||
return 1.
|
||||
return 10**v
|
||||
|
||||
def fix_minus(self, s):
|
||||
return s.replace("-", "−") # unicode minus
|
||||
|
||||
def format(self, step):
|
||||
"""
|
||||
Determine format string to represent step sufficiently accurate.
|
||||
"""
|
||||
dynamic = -int(np.floor(np.log10(step)))
|
||||
dynamic = min(max(0, dynamic), self.precision)
|
||||
return "{{:1.{:d}f}}".format(dynamic)
|
||||
|
||||
def compact_exponential(self, v):
|
||||
"""
|
||||
Format `v` in in compact exponential, stripping redundant elements
|
||||
(pluses, leading and trailing zeros and decimal point, trailing `e`).
|
||||
"""
|
||||
# this is after the matplotlib ScalarFormatter
|
||||
# without any i18n
|
||||
significand, exponent = "{:1.10e}".format(v).split("e")
|
||||
significand = significand.rstrip("0").rstrip(".")
|
||||
exponent_sign = exponent[0].replace("+", "")
|
||||
exponent = exponent[1:].lstrip("0")
|
||||
s = "{:s}e{:s}{:s}".format(significand, exponent_sign,
|
||||
exponent).rstrip("e")
|
||||
return self.fix_minus(s)
|
||||
|
||||
def prefix(self, offset, magnitude):
|
||||
"""
|
||||
Stringify `offset` and `magnitude`.
|
||||
|
||||
Expects the string to be shown top/left of the value it refers to.
|
||||
"""
|
||||
prefix = ""
|
||||
if offset != 0.:
|
||||
prefix += self.compact_exponential(offset) + " + "
|
||||
if magnitude != 1.:
|
||||
prefix += self.compact_exponential(magnitude) + " × "
|
||||
return prefix
|
||||
|
||||
def __call__(self, a, b):
|
||||
"""
|
||||
Determine ticks, prefix and labels given the interval
|
||||
`[a, b[`.
|
||||
|
||||
Return tick values, prefix string to be show to the left or
|
||||
above the labels, and tick labels.
|
||||
"""
|
||||
ticks = self.ticks(a, b)
|
||||
offset = self.offset(a, ticks[1] - ticks[0])
|
||||
t = ticks - offset
|
||||
magnitude = self.magnitude(t[0], t[-1], t[1] - t[0])
|
||||
t /= magnitude
|
||||
prefix = self.prefix(offset, magnitude)
|
||||
format = self.format(t[1] - t[0])
|
||||
labels = [self.fix_minus(format.format(t)) for t in t]
|
||||
return ticks, prefix, labels
|
||||
Loading…
Reference in New Issue