PyQtGraph – 符号
PyQtGraph 是一个图形和用户界面Python库，用于设计和科学应用程序中通常需要的功能。它提供了用于显示数据（绘图、视频等）的快速交互式图形。折线图是一种图形，它将信息显示为一系列通常称为标记的数据点，由直线段连接。散点图使用点来表示两个不同数值变量的值。它是一种图形，使用笛卡尔坐标绘制以显示一组数据的典型两个变量的值
当我们创建折线图或散点图时，需要使用某些符号来突出表示某些数据的点，默认为圆形，但可以根据需要进行修改。 pyqtgraph 总共提供了 12 个符号，可用于根据需要更改符号。
以下是此模块中可用的符号列表：
- o :默认符号，圆形符号
- t :向下的三角形符号
- t1 :三角形向上符号
- t2 :三角形指向右侧符号
- t3 :三角形指向左侧符号
- s :方形符号
- p :五边形符号
- h :六边形符号
- star :星星符号
- + :加号
- d :棱镜符号
- x :十字符号
这是它们在输出屏幕上的显示方式：
我们可以在下面给出的命令的帮助下创建一个绘图窗口：
plt = pg.plot()
为了实现上述概念，可以遵循以下步骤：
- 导入 pyqtgraph、pyqt5 和 numpy 模块
- 创建主窗口类
- 创建绘图窗口对象
- 将图例添加到绘图窗口
- 创建 12 条具有不同点的线，使它们不会相互交叉并具有不同的符号和颜色
- 将绘图窗口和其他小部件（如标签）添加到网格布局
- 将网格布局小部件设置为主窗口的中央小部件
例子：
Python3
# importing Qt widgets
from PyQt5.QtWidgets import *
# importing system
import sys
# importing numpy as np
import numpy as np
# importing pyqtgraph as pg
import pyqtgraph as pg
from PyQt5.QtGui import * from PyQt5.QtCore import * from collections import namedtuple
class Window(QMainWindow):
def __init__(self):
super().__init__()
# setting title
self.setWindowTitle("PyQtGraph")
# setting geometry
self.setGeometry(100, 100, 800, 500)
# icon
icon = QIcon("skin.png")
# setting icon to the window
self.setWindowIcon(icon)
# calling method
self.UiComponents()
# showing all the widgets
self.show()
# method for components
def UiComponents(self):
# creating a widget object
widget = QWidget()
# text
text = "Geeksforgeeks Different Symbols"
# creating a label
label = QLabel(text)
# setting minimum width
label.setMinimumWidth(130)
# making label do word wrap
label.setWordWrap(True)
# setting pyqtgraph configuration
pg.setConfigOptions(antialias = True)
# creating a plot window
plot = pg.plot()
# adding legend to the plot window
plot.addLegend()
# plot the line1 with symbol o
# having color blue
line1 = plot.plot([1, 1, 1, 1, 1], pen =(0, 0, 200), symbolBrush =(0, 0, 200),
symbolPen ='w', symbol ='o', symbolSize = 14, name ="symbol ='o'")
# plot the line2 with symbol t
# having color green
line2 = plot.plot([2, 2, 2, 2, 2], pen =(0, 128, 0), symbolBrush =(0, 128, 0),
symbolPen ='w', symbol ='t', symbolSize = 14, name ="symbol ='t'")
# plot the line3 with symbol t1
# having color bluegreen
line3 = plot.plot([3, 3, 3, 3, 3], pen =(19, 234, 201), symbolBrush =(19, 234, 201),
symbolPen ='w', symbol ='t1', symbolSize = 14, name ="symbol ='t1'")
# plot the line4 with symbol t2
# having color purple
line4 = plot.plot([4, 4, 4, 4, 4], pen =(195, 46, 212), symbolBrush =(195, 46, 212),
symbolPen ='w', symbol ='t2', symbolSize = 14, name ="symbol ='t2'")
# plot the line5 with symbol t3
# having color brownish
line5 = plot.plot([5, 5, 5, 5, 5], pen =(250, 194, 5), symbolBrush =(250, 194, 5),
symbolPen ='w', symbol ='t3', symbolSize = 14, name ="symbol ='t3'")
# plot the line6 with symbol s
# having color grey
line6 = plot.plot([6, 6, 6, 6, 6], pen =(54, 55, 55), symbolBrush =(55, 55, 55), symbolPen ='w', symbol ='s', symbolSize = 14,
name ="symbol ='s'")
# plot the line7 with symbol p
# having color sky blue
line7 = plot.plot([7, 7, 7, 7, 7], pen =(0, 114, 189), symbolBrush =(0, 114, 189),
symbolPen ='w', symbol ='p', symbolSize = 14, name ="symbol ='p'")
# plot the line8 with symbol h
# having color orange
line8 = plot.plot([8, 8, 8, 8, 8], pen =(217, 83, 25), symbolBrush =(217, 83, 25),
symbolPen ='w', symbol ='h', symbolSize = 14, name ="symbol ='h'")
# plot the line9 with symbol star
# having yellow color
line9 = plot.plot([9, 9, 9, 9, 9], pen =(237, 177, 32), symbolBrush =(237, 177, 32),
symbolPen ='w', symbol ='star', symbolSize = 14, name ="symbol ='star'")
# plot the line10 with symbol +
# having blueish color
line10 = plot.plot([10, 10, 10, 10, 10], pen =(126, 47, 142), symbolBrush =(126, 47, 142),
symbolPen ='w', symbol ='+', symbolSize = 14, name ="symbol ='+'")
# plot the line11 with symbol d
# having greensih color
line11 = plot.plot([11, 11, 11, 11, 11], pen =(119, 172, 48), symbolBrush =(119, 172, 48),
symbolPen ='w', symbol ='d', symbolSize = 14, name ="symbol ='d'")
# plot the line12 with symbol x
# having off white color
line12 = plot.plot([12, 12, 12, 12, 12], pen =(180, 180, 180), symbolBrush =(180, 180, 180),
symbolPen ='w', symbol ='x', symbolSize = 14, name ="symbol ='x'")
# setting x-axis range
plot.setXRange(-3, 4)
# Creating a grid layout
layout = QGridLayout()
# minimum width value of the label
label.setMinimumWidth(130)
# setting this layout to the widget
widget.setLayout(layout)
# adding label in the layout
layout.addWidget(label, 1, 0)
# plot window goes on right side, spanning 3 rows
layout.addWidget(plot, 0, 1, 3, 1)
# setting this widget as central widget of the main widow
self.setCentralWidget(widget)
# create pyqt5 app
App = QApplication(sys.argv)
# create the instance of our Window
window = Window()
# start the app
sys.exit(App.exec())输出 ：