add 20

SusuZzhang · SusuZzhang · commit 0cd93242c98f · 2022-03-16T21:52:43.000+08:00
diff --git a/README.md b/README.md
@@ -31,3 +31,5 @@
 * p18_打开网页   [源码下载](p18_打开网页)    [博文地址](https://xugaoxiang.com/2021/08/05/pyqt5-18-pyqtwebengine/)
   
 * p19_跑马灯   [源码下载](p19_跑马灯)    [博文地址](https://xugaoxiang.com/2021/10/08/pyqt5-19-marquee/)
+* 
+* p20_柱状图 [源码下载](p20_柱状图)    [博文地址](https://xugaoxiang.com/2021/10/08/pyqt5-20-barchart/)
diff --git a/p20_柱状图/main.py b/p20_柱状图/main.py
@@ -0,0 +1,50 @@
+from PyQt5.QtWidgets import QApplication, QWidget, QVBoxLayout
+from PyQt5.QtChart import QChart, QChartView, QBarSet, QBarSeries, QBarCategoryAxis
+import sys
+import random
+
+class MainWindow(QWidget):
+    def __init__(self):
+        super().__init__()
+
+        self.setGeometry(200, 200, 600, 400)
+        self.setWindowTitle("柱状图示例")
+
+        set = QBarSet("Points")
+
+        for i in range(7):
+            # 随机7个样本数据
+            set.append(random.randint(0, 100))
+
+        # 若显示各部分所占百分比，用QPercentBarSeries
+        series = QBarSeries()
+        series.append(set)
+
+        chart = QChart()
+        chart.addSeries(series)
+        chart.setTitle("一周数据展示")
+        chart.setAnimationOptions(QChart.SeriesAnimations)
+        chart.setTheme(QChart.ChartThemeDark)
+
+        # 横轴数据
+        categories = ["星期一", "星期二", "星期三", "星期四", "星期五", "星期六", "星期日"]
+
+        axis = QBarCategoryAxis()
+        axis.append(categories)
+        chart.createDefaultAxes()
+        chart.setAxisX(axis, series)
+
+        # 实例化chartview
+        chartview = QChartView(chart)
+
+        vbox = QVBoxLayout()
+        vbox.addWidget(chartview)
+
+        self.setLayout(vbox)
+
+if __name__ == '__main__':
+
+    app = QApplication(sys.argv)
+    window = MainWindow()
+    window.show()
+    sys.exit(app.exec())
