[pyqtgraph] Set the size ratio of the graph

Thing you want to do

environment

Mac OS Python 3.8.5

PyQt5 5.15.2 PyQt5-sip 12.8.1 pyqtgraph 0.11.1

pip install PyQt5 PyQt5-sip pyqtgraph

code

I'm using numpy for plotting. pip install numpy

"""Set the size ratio of the graph"""

import dataclasses
import itertools
from typing import Optional
import sys

import numpy as np
from PyQt5 import QtWidgets  #Almost never used
import pyqtgraph as pg

SAMPLE_DATA1 = np.linspace(-100, 100) ** 1
SAMPLE_DATA2 = np.linspace(-100, 100) ** 2
SAMPLE_DATA3 = np.linspace(-100, 100) ** 3


@dataclasses.dataclass
class ChangeSizeRatioWidget(pg.GraphicsLayoutWidget):
    """Main screen
    Attributes #
    ----------
    parent: Optional[QtWidgets.QWidget] default=None
Parent screen
    """
    parent: Optional[QtWidgets.QWidget] = None

    def __post_init__(self) -> None:
        """Load superclass and add plot"""
        super(ChangeSizeRatioWidget, self).__init__(parent=self.parent)

        self.plotter1 = self.addPlot(row=0, col=0)
        self.plotter1.showGrid(x=True, y=True, alpha=0.8)
        self.plotter1_curve = self.plotter1.plot(pen=pg.mkPen('#f00', width=5))
        self.plotter1_curve.setData(SAMPLE_DATA1)

        self.plotter2 = self.addPlot(row=0, col=1)
        self.plotter2.showGrid(x=True, y=True, alpha=0.8)
        self.plotter2_curve = self.plotter2.plot(pen=pg.mkPen('#00f', width=5))
        self.plotter2_curve.setData(SAMPLE_DATA2)

        self.ci.layout.setColumnStretchFactor(0, 8)
        self.ci.layout.setColumnStretchFactor(1, 5)


def main():
    app = QtWidgets.QApplication(sys.argv)
    window = ChangeSizeRatioWidget(parent=None)
    window.show()
    sys.exit(app.exec_())


if __name__ == "__main__":
    main()

Details

self.ci.layout.setColumnStretchFactor(0, 8)
self.ci.layout.setColumnStretchFactor(1, 5)

pg.GraphicsLayoutWidget.ci.layout.setColumnStretchFactor(col, size) col-> column index size-> ratio

When changing for a line

self.ci.layout.setRowStretchFactor(0, 8)
self.ci.layout.setRowStretchFactor(1, 5)

is

Other

Straddle multiple columns

"""Straddle multiple columns"""

import dataclasses
import itertools
from typing import Optional
import sys

import numpy as np
from PyQt5 import QtWidgets  #Almost never used
import pyqtgraph as pg

SAMPLE_DATA1 = np.linspace(-100, 100) ** 1
SAMPLE_DATA2 = np.linspace(-100, 100) ** 2
SAMPLE_DATA3 = np.linspace(-100, 100) ** 3


@dataclasses.dataclass
class ChangeSizeRatioWidget(pg.GraphicsLayoutWidget):
    """Main screen
    Attributes #
    ----------
    parent: Optional[QtWidgets.QWidget] default=None
Parent screen
    """
    parent: Optional[QtWidgets.QWidget] = None

    def __post_init__(self) -> None:
        """Load superclass and add plot"""
        super(ChangeSizeRatioWidget, self).__init__(parent=self.parent)

        self.plotter1 = self.addPlot(row=0, col=0)
        self.plotter1.showGrid(x=True, y=True, alpha=0.8)
        self.plotter1_curve = self.plotter1.plot(pen=pg.mkPen('#f00', width=5))
        self.plotter1_curve.setData(SAMPLE_DATA1)

        self.plotter2 = self.addPlot(row=0, col=1)
        self.plotter2.showGrid(x=True, y=True, alpha=0.8)
        self.plotter2_curve = self.plotter2.plot(pen=pg.mkPen('#00f', width=5))
        self.plotter2_curve.setData(SAMPLE_DATA2)

        self.plotter3 = self.addPlot(row=1, col=0, colspan=2)
        self.plotter3.showGrid(x=True, y=True, alpha=0.8)
        self.plotter3_curve = self.plotter3.plot(pen=pg.mkPen('#0f0', width=5))
        self.plotter3_curve.setData(SAMPLE_DATA3)


def main():
    app = QtWidgets.QApplication(sys.argv)
    window = ChangeSizeRatioWidget(parent=None)
    window.show()
    sys.exit(app.exec_())


if __name__ == "__main__":
    main()

self.plotter3 = self.addPlot(row=1, col=0, colspan=2) Set with colspan

reference

I forgot,,