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import os.path as osp
import numpy as np
from qtpy import QtCore as QC
from qtpy import QtGui as QG
from qtpy import QtWidgets as QW
import qwt
from qwt import qthelpers as qth
app = QW.QApplication([])
# --- Construct custom symbol ---
path = QG.QPainterPath()
path.moveTo(0, 8)
path.lineTo(0, 5)
path.lineTo(-3, 5)
path.lineTo(0, 0)
path.lineTo(3, 5)
path.lineTo(0, 5)
transform = QG.QTransform()
transform.rotate(-30.0)
path = transform.map(path)
pen = QG.QPen(QC.Qt.black, 2)
pen.setJoinStyle(QC.Qt.MiterJoin)
symbol = qwt.QwtSymbol()
symbol.setPen(pen)
symbol.setBrush(QC.Qt.red)
symbol.setPath(path)
symbol.setPinPoint(QC.QPointF(0.0, 0.0))
symbol.setSize(10, 14)
# --- Test it within a simple plot ---
curve = qwt.QwtPlotCurve()
curve_pen = QG.QPen(QC.Qt.blue)
curve_pen.setStyle(QC.Qt.DotLine)
curve.setPen(curve_pen)
curve.setSymbol(symbol)
x = np.linspace(0, 10, 10)
curve.setData(x, np.sin(x))
plot = qwt.QwtPlot()
curve.attach(plot)
plot.replot()
qth.take_screenshot(
plot,
osp.join(osp.abspath(osp.dirname(__file__)), "_static", "symbol_path_example.png"),
size=(600, 300),
)
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