def _create_revision_count_graph(self):
stats = CollectionStats(self.col)
categories_labels = list(range(-30, 1, 1))
data = stats.revision_count_stats()
data = self._transform_first_column_to_key(data)
data = self._add_default_value_for_missing_keys(
data, [0, 0, 0, 0, 0], categories_labels)
series = QStackedBarSeries(self)
setLearning = QBarSet("Learning", self)
[setLearning.append(row[0]) for row in data]
setYoung = QBarSet("Young", self)
[setYoung.append(row[1]) for row in data]
setMature = QBarSet("Mature", self)
[setMature.append(row[2]) for row in data]
setLapse = QBarSet("Lapse", self)
[setLapse.append(row[3]) for row in data]
setEarly = QBarSet("Early", self)
[setEarly.append(row[4]) for row in data]
categories = QBarCategoryAxis()
categories.setCategories([str(-i) for i in categories_labels])
series.append(setLearning)
series.append(setYoung)
series.append(setMature)
series.append(setLapse)
series.append(setEarly)
chart = QChart()
chart.addSeries(series)
chart.createDefaultAxes()
chart.setAxisX(categories, series)
chart.setAnimationOptions(QChart.SeriesAnimations)
chart.setTitle("Number of cards reviewed recently")
chart.legend().setVisible(True)
chart.legend().setAlignment(Qt.AlignBottom)
chartview = QChartView(chart)
chartview.setRenderHint(QPainter.Antialiasing)
self.layout.addWidget(chartview)
