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pyqtgraph散点图项目设置

pyqtgraph python

Surabhi Choudhary · 技术社区 · 8 年前

from pyqtgraph.Qt import QtGui, QtCore
import pyqtgraph as pg
import numpy as np

app = QtGui.QApplication([])
mw = QtGui.QMainWindow()
mw.resize(800,800)
view = pg.GraphicsLayoutWidget()  
mw.setCentralWidget(view)
mw.setWindowTitle('pyqtgraph example: ScatterPlot')
w1 = view.addPlot()
x = [1,2,3,4,5,6,7,8,9,10]
y = [10,8,6,4,2,20,18,16,14,12]
s1 = pg.ScatterPlotItem(x,y,size=10, pen=pg.mkPen(None), brush=pg.mkBrush(255, 255, 255, 120))
s1.setBrush(['r']*10, mask=None)
w1.addItem(s1)
mw.show()

当我运行这段代码时,我得到如下错误:

回溯(最近一次调用:文件“”,第1行,在

文件 “C:\Python34\lib\site packages\pyqtgraph\graphicsItems\ScatterPlotItem.py”, 第467行,在挫折中 self.updatespot(数据集)

文件 “C:\Python34\lib\site packages\pyqtgraph\graphicsItems\ScatterPlotItem.py”, self.fragmentAtlas。getAtlas()#生成atlas,以便源宽度可用。

文件 “C:\Python34\lib\site packages\pyqtgraph\graphicsItems\ScatterPlotItem.py”, 第193行,在getAtlas中 self.buildAtlas()

文件 “C:\Python34\lib\site packages\pyqtgraph\graphicsItems\ScatterPlotItem.py”, buildAtlas第143行 img=renderSymbol(键[0],键[1],sourceRect.pen,sourceRect.画笔)

文件 “C:\Python34\lib\site packages\pyqtgraph\graphicsItems\ScatterPlotItem.py”, 第74行,在renderSymbol中 drawSymbol(p、符号、大小、笔、画笔)

文件 “C:\Python34\lib\site packages\pyqtgraph\graphicsItems\ScatterPlotItem.py”, 第49行,图纸符号油漆匠setBrush(画笔)类型错误:参数与任何重载调用不匹配:QPainter。挫折(QBrush):参数1有意外类型“str”QPainter.setBrush(Qt.BrushStyle):参数1

我怎样才能通过这个列表呢?我必须给不同的点分配不同的颜色。

2 回复 | 直到 8 年前

boudewijn21 6 年前

symbolBrush 关键字。然后,您的代码变成:

from pyqtgraph.Qt import QtGui, QtCore
import pyqtgraph as pg
import numpy as np
import time
import sys

app = QtGui.QApplication([])
mw = QtGui.QMainWindow()
mw.resize(800,800)
view = pg.GraphicsLayoutWidget()
mw.setCentralWidget(view)
mw.setWindowTitle('pyqtgraph example: ScatterPlot')
w1 = view.addPlot()
x = [1,2,3,4,5,6,7,8,9,10]
y = [10,8,6,4,2,20,18,16,14,12]

brush_list = [pg.mkColor(c) for c in "rgbcmykwrg"]

p1 = w1.plot()
s1 = p1.setData(x=x, y=y, size=10, pen=pg.mkPen(None), brush='g', symbol='o', symbolBrush=brush_list, symbolPen='r')
mw.show()
sys.exit(QtGui.QApplication.exec_())

我需要这样做 p1 = w1.plot() 为了让它工作,但我对所有的pyqtgraph对象不够流利,无法告诉您它的作用。

我必须将颜色字符串(或元组等)转换为 pg.mkColor() 对象以使其工作(尽管文档说不需要)

请注意 brush 关键字填充图形,直到指定某个值(例如x轴),这对于线很有用,但对于点不显示任何内容,如您在图像中看到的。

这个 symbolPen 关键字可用于点的线颜色。

eyllanesc RAHUL KUMAR 8 年前

添加 s.setBrush(QtGui.QBrush({your parameters})) 举例来说:

QtGui.QBrush()
QtGui.QBrush(Qt.BrushStyle bs)
QtGui。QBrush(QColor,Qt.BrushStyle style=Qt.SolidPattern)
QtGui.QBrush(Qt.GlobalColor,Qt.BrushStyle style=Qt.SolidPattern)
QtGui。QBrush(QColor颜色,QPixmap像素映射)
QtGui.QBrush(Qt.GlobalColor、QPixmap和pixmap)
QtGui。QBrush(QPixmap pixmap)
QtGui。QBrush(QGradient渐变)
QtGui。QBrush(QBrushBrush)
QtGui。QBrush(QVariant变体)

在您的代码中:

import sys
from pyqtgraph.Qt import QtGui, QtCore
import pyqtgraph as pg
import numpy as np

app = QtGui.QApplication(sys.argv)
mw = QtGui.QMainWindow()
mw.resize(800, 800)
view = pg.GraphicsLayoutWidget()
mw.setCentralWidget(view)
mw.setWindowTitle('pyqtgraph example: ScatterPlot')
w1 = view.addPlot()
x = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
y = [10, 8, 6, 4, 2, 20, 18, 16, 14, 12]

# Create seed for the random
time = QtCore.QTime.currentTime()
QtCore.qsrand(time.msec())

for i in range(len(x)):
    s = pg.ScatterPlotItem([x[i]], [y[i]], size=10, pen=pg.mkPen(None))  # brush=pg.mkBrush(255, 255, 255, 120))
    s.setBrush(QtGui.QBrush(QtGui.QColor(QtCore.qrand() % 256, QtCore.qrand() % 256, QtCore.qrand() % 256)))
    w1.addItem(s)
mw.show()
sys.exit(QtGui.QApplication.exec_())

输出:

如果要为前5个点(x:1-5)设置红色,为另5个点设置蓝色(x:6-10)

import sys
from pyqtgraph.Qt import QtGui
import pyqtgraph as pg

app = QtGui.QApplication(sys.argv)
mw = QtGui.QMainWindow()
mw.resize(800, 800)
view = pg.GraphicsLayoutWidget()
mw.setCentralWidget(view)
mw.setWindowTitle('pyqtgraph example: ScatterPlot')
w1 = view.addPlot()
x = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
y = [10, 8, 6, 4, 2, 20, 18, 16, 14, 12]

color = QtGui.QColor("#0000FF")
s = pg.ScatterPlotItem(x[:5], y[:5], size=10, pen=pg.mkPen(None), brush='r')
w1.addItem(s)
s = pg.ScatterPlotItem(x[5:], y[5:], size=10, pen=pg.mkPen(None), brush='b')
w1.addItem(s)
mw.show()
sys.exit(QtGui.QApplication.exec_())