将我选择的颜色附加到 QPieSeries 的每个切片

Question

我想让饼图的每一部分都成为我选择的颜色。我需要知道 QPieSlice 的 snytax（如果这是我使用的）以及如何将颜色附加到馅饼的特定切片。例如，我希望 "Auto" 切片为“#00FF00”，"Employment" 切片为“#1A8CFF”，等等

下面是我的馅饼。我尝试过各种方法，例如：

QPieSlice.setBrush(QPieSlice.setColor(QColor('#00FF00')))

但它不起作用，即使它起作用，我也不知道如何将它附加到特定的切片以及将它放在哪里。

series.append("Auto", self.expensesWindow.piechart[0])
series.append("Employment", self.expensesWindow.piechart[1])
series.append("Insurance", self.expensesWindow.piechart[2])
series.append("Household", self.expensesWindow.piechart[3])
series.append("Housing", self.expensesWindow.piechart[4])
series.append("Entertainment", self.expensesWindow.piechart[5])
series.append("Utilities", self.expensesWindow.piechart[6])
series.append("Other", self.expensesWindow.piechart[7])

Answer 1

当您使用 append() method of QPieSeries, passing it the name and value it returns its associated QPieSlice 时，您必须使用该元素

from PyQt5 import QtCore, QtGui, QtWidgets, QtChart


if __name__ == "__main__":
    import sys

    app = QtWidgets.QApplication(sys.argv)

    data = {
        "Auto": (10, QtGui.QColor("#00FF00")),
        "Employment": (20, QtGui.QColor("#1A8CFF")),
        "Insurance": (30, QtGui.QColor("salmon")),
        "Household": (40, QtGui.QColor(255, 0, 255)),
        "Housing": (40, QtGui.QColor("blue")),
        "Entertainment": (30, QtGui.QColor(0, 255, 255)),
        "Utilities": (20, QtGui.QColor("#aabbcc")),
        "Other": (10, QtGui.QColor("gray")),
    }

    series = QtChart.QPieSeries()

    for name, (value, color) in data.items():
        _slice = series.append(name, value)
        _slice.setBrush(color)

    chart = QtChart.QChart()
    chart.addSeries(series)
    chart.setTitle("Example for ")
    chart.legend().setAlignment(QtCore.Qt.AlignBottom)
    chart.legend().setFont(QtGui.QFont("Arial", 7))

    chartview = QtChart.QChartView(chart)
    chartview.setRenderHint(QtGui.QPainter.Antialiasing)

    w = QtWidgets.QMainWindow()
    w.setCentralWidget(chartview)
    w.resize(640, 480)
    w.show()

    sys.exit(app.exec_())

但是你也可以构建一个QPieSlice using the name and value you can pass it using the other append()方法：

# ...
series = QtChart.QPieSeries()

for name, (value, color) in data.items():
    _slice = QtChart.QPieSlice(name, value)
    _slice.setBrush(color)
    series.append(_slice)

chart = QtChart.QChart()
# ...

而且你也可以通过QPieSlice using the third append()方法创建列表来构建：

# ...
series = QtChart.QPieSeries()

slices = []

for name, (value, color) in data.items():
    _slice = QtChart.QPieSlice(name, value)
    _slice.setBrush(color)
    slices.append(_slice)

series.append(slices)

chart = QtChart.QChart()
# ...

更新：

在你的情况下，使用第二种方法：

_slice = series.append("Auto", self.expensesWindow.piechart[0])
_slice.setBrush(QColor('#00FF00'))
_slice = series.append("Employment", self.expensesWindow.piechart[1])
_slice.setBrush(QColor('#1A8CFF'))
# ...

将我选择的颜色附加到 QPieSeries 的每个切片

Attach colors of my choosing to each slice of QPieSeries

python

pyqt

pyqt5

qtcharts

pyqtchart