class CurveDemo1(QFrame):
def __init__(self, *args):
QFrame.__init__(self, *args)
self.xMap = QwtScaleMap()
self.xMap.setScaleInterval(-0.5, 10.5)
self.yMap = QwtScaleMap()
self.yMap.setScaleInterval(-1.1, 1.1)
# frame style
self.setFrameStyle(QFrame.Box | QFrame.Raised)
self.setLineWidth(2)
self.setMidLineWidth(3)
# calculate values
self.x = np.arange(0, 10.0, 10.0 / 27)
self.y = np.sin(self.x) * np.cos(2 * self.x)
# make curves with different styles
self.curves = []
self.titles = []
# curve 1
self.titles.append("Style: Sticks, Symbol: Ellipse")
curve = QwtPlotCurve()
curve.setPen(QPen(Qt.red))
curve.setStyle(QwtPlotCurve.Sticks)
curve.setSymbol(
QwtSymbol(QwtSymbol.Ellipse, QBrush(Qt.yellow), QPen(Qt.blue),
QSize(5, 5)))
self.curves.append(curve)
# curve 2
self.titles.append("Style: Lines, Symbol: None")
curve = QwtPlotCurve()
curve.setPen(QPen(Qt.darkBlue))
curve.setStyle(QwtPlotCurve.Lines)
self.curves.append(curve)
# curve 3
self.titles.append("Style: Lines, Symbol: None, Antialiased")
curve = QwtPlotCurve()
curve.setPen(QPen(Qt.darkBlue))
curve.setStyle(QwtPlotCurve.Lines)
curve.setRenderHint(QwtPlotItem.RenderAntialiased)
self.curves.append(curve)
# curve 4
self.titles.append("Style: Steps, Symbol: None")
curve = QwtPlotCurve()
curve.setPen(QPen(Qt.darkCyan))
curve.setStyle(QwtPlotCurve.Steps)
self.curves.append(curve)
# curve 5
self.titles.append("Style: NoCurve, Symbol: XCross")
curve = QwtPlotCurve()
curve.setStyle(QwtPlotCurve.NoCurve)
curve.setSymbol(
QwtSymbol(QwtSymbol.XCross, QBrush(), QPen(Qt.darkMagenta),
QSize(5, 5)))
self.curves.append(curve)
# attach data, using Numeric
for curve in self.curves:
curve.setData(self.x, self.y)
def shiftDown(self, rect, offset):
rect.translate(0, offset)
def paintEvent(self, event):
QFrame.paintEvent(self, event)
painter = QPainter(self)
painter.setClipRect(self.contentsRect())
self.drawContents(painter)
def drawContents(self, painter):
# draw curves
r = self.contentsRect()
dy = int(r.height() / len(self.curves))
r.setHeight(dy)
for curve in self.curves:
self.xMap.setPaintInterval(r.left(), r.right())
self.yMap.setPaintInterval(r.top(), r.bottom())
painter.setRenderHint(
QPainter.Antialiasing,
curve.testRenderHint(QwtPlotItem.RenderAntialiased),
)
curve.draw(painter, self.xMap, self.yMap, r)
self.shiftDown(r, dy)
# draw titles
r = self.contentsRect()
r.setHeight(dy)
painter.setFont(QFont("Helvetica", 8))
painter.setPen(Qt.black)
for title in self.titles:
painter.drawText(
0,
r.top(),
r.width(),
painter.fontMetrics().height(),
Qt.AlignTop | Qt.AlignHCenter,
title,
)
self.shiftDown(r, dy)
class CurveDemo(QFrame):
def __init__(self, *args):
QFrame.__init__(self, *args)
self.xMap = QwtScaleMap()
self.xMap.setScaleInterval(-0.5, 10.5)
self.yMap = QwtScaleMap()
self.yMap.setScaleInterval(-1.1, 1.1)
# frame style
self.setFrameStyle(QFrame.Box | QFrame.Raised)
self.setLineWidth(2)
self.setMidLineWidth(3)
# calculate values
self.x = np.arange(0, 10.0, 10.0/27)
self.y = np.sin(self.x)*np.cos(2*self.x)
# make curves with different styles
self.curves = []
self.titles = []
# curve 2
self.titles.append('Style: Lines, Symbol: None')
curve = QwtPlotCurve()
curve.setPen(QPen(Qt.darkBlue))
curve.setStyle(QwtPlotCurve.Lines)
self.curves.append(curve)
# attach data, using Numeric
for curve in self.curves:
curve.setData(self.x, self.y)
def shiftDown(self, rect, offset):
rect.translate(0, offset)
def paintEvent(self, event):
QFrame.paintEvent(self, event)
painter = QPainter(self)
painter.setClipRect(self.contentsRect())
self.drawContents(painter)
def drawContents(self, painter):
# draw curves
r = self.contentsRect()
dy = r.height()/len(self.curves)
r.setHeight(dy)
for curve in self.curves:
self.xMap.setPaintInterval(r.left(), r.right())
self.yMap.setPaintInterval(r.top(), r.bottom())
engine = painter.device().paintEngine()
if engine is not None and engine.hasFeature(QPaintEngine.Antialiasing):
painter.setRenderHint(
QPainter.Antialiasing,
curve.testRenderHint(QwtPlotItem.RenderAntialiased))
curve.draw(painter, self.xMap, self.yMap, r)
self.shiftDown(r, dy)
# draw titles
r = self.contentsRect()
r.setHeight(dy)
painter.setFont(QFont('Helvetica', 8))
painter.setPen(Qt.black)
for title in self.titles:
painter.drawText(
0, r.top(), r.width(), painter.fontMetrics().height(),
Qt.AlignTop | Qt.AlignHCenter, title)
self.shiftDown(r, dy)
