Add nested donuts example

Task-number: PYSIDE-738
Change-Id: I16c8bbfaa8c7ed6fc08ed6b16c9bdf8dd23ce0a2
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>

1 files changed, 137 insertions, 0 deletions

diff --git a/examples/charts/nesteddonuts.py b/examples/charts/nesteddonuts.py
new file mode 100644
index 000000000..bee3c1c79
--- /dev/null
+++ b/examples/charts/nesteddonuts.py
@@ -0,0 +1,137 @@
+#!/usr/bin/python
+
+#############################################################################
+##
+## Copyright (C) 2018 The Qt Company Ltd.
+## Contact: http://www.qt.io/licensing/
+##
+## This file is part of the Qt for Python examples of the Qt Toolkit.
+##
+## $QT_BEGIN_LICENSE:BSD$
+## You may use this file under the terms of the BSD license as follows:
+##
+## "Redistribution and use in source and binary forms, with or without
+## modification, are permitted provided that the following conditions are
+## met:
+##   * Redistributions of source code must retain the above copyright
+##     notice, this list of conditions and the following disclaimer.
+##   * Redistributions in binary form must reproduce the above copyright
+##     notice, this list of conditions and the following disclaimer in
+##     the documentation and/or other materials provided with the
+##     distribution.
+##   * Neither the name of The Qt Company Ltd nor the names of its
+##     contributors may be used to endorse or promote products derived
+##     from this software without specific prior written permission.
+##
+##
+## THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+## "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+## LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+## A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+## OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+## SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+## LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+## DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+## THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+## (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+## OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+##
+## $QT_END_LICENSE$
+##
+#############################################################################
+
+"""PySide2 port of the Nested Donuts example from Qt v5.x"""
+
+import sys
+
+from PySide2.QtCore import Qt, QTimer
+from PySide2.QtGui import QPainter
+from PySide2.QtWidgets import QApplication, QGridLayout, QWidget
+from PySide2.QtCharts import QtCharts
+
+from random import randrange
+from functools import partial
+
+class Widget(QWidget):
+    def __init__(self):
+        QWidget.__init__(self)
+        self.setMinimumSize(800, 600)
+        self.donuts = []
+        self.chart_view = QtCharts.QChartView()
+        self.chart_view.setRenderHint(QPainter.Antialiasing)
+        self.chart = self.chart_view.chart()
+        self.chart.legend().setVisible(False)
+        self.chart.setTitle("Nested donuts demo")
+        self.chart.setAnimationOptions(QtCharts.QChart.AllAnimations)
+
+        self.min_size = 0.1
+        self.max_size = 0.9
+        self.donut_count = 5
+
+        self.setup_donuts()
+
+        # create main layout
+        self.main_layout = QGridLayout(self)
+        self.main_layout.addWidget(self.chart_view, 1, 1)
+        self.setLayout(self.main_layout)
+
+        self.update_timer = QTimer(self)
+        self.update_timer.timeout.connect(self.update_rotation)
+        self.update_timer.start(1250)
+
+    def setup_donuts(self):
+        for i in range(self.donut_count):
+            donut = QtCharts.QPieSeries()
+            slccount = randrange(3, 6)
+            for j in range(slccount):
+                value = randrange(100, 200)
+
+                slc = QtCharts.QPieSlice(str(value), value)
+                slc.setLabelVisible(True)
+                slc.setLabelColor(Qt.white)
+                slc.setLabelPosition(QtCharts.QPieSlice.LabelInsideTangential)
+
+                # Connection using an extra parameter for the slot
+                slc.hovered[bool].connect(partial(self.explode_slice, slc=slc))
+
+                donut.append(slc)
+                size = (self.max_size - self.min_size)/self.donut_count
+                donut.setHoleSize(self.min_size + i * size)
+                donut.setPieSize(self.min_size + (i + 1) * size)
+
+            self.donuts.append(donut)
+            self.chart_view.chart().addSeries(donut)
+
+
+
+    def update_rotation(self):
+        for donut in self.donuts:
+            phase_shift =  randrange(-50, 100)
+            donut.setPieStartAngle(donut.pieStartAngle() + phase_shift)
+            donut.setPieEndAngle(donut.pieEndAngle() + phase_shift)
+
+    def explode_slice(self, exploded, slc):
+        if exploded:
+            self.update_timer.stop()
+            slice_startangle = slc.startAngle()
+            slice_endangle = slc.startAngle() + slc.angleSpan()
+
+            donut = slc.series()
+            idx = self.donuts.index(donut)
+            for i in range(idx + 1, len(self.donuts)):
+                self.donuts[i].setPieStartAngle(slice_endangle)
+                self.donuts[i].setPieEndAngle(360 + slice_startangle)
+        else:
+            for donut in self.donuts:
+                donut.setPieStartAngle(0)
+                donut.setPieEndAngle(360)
+
+            self.update_timer.start()
+
+        slc.setExploded(exploded)
+
+if __name__ == "__main__":
+    app = QApplication(sys.argv)
+    w = Widget()
+    w.show()
+    sys.exit(app.exec_())