Re: [pyqtgraph] how to add text or label in Pyqtgraph 3D

[Luke Campagnola]

On Fri, May 16, 2014 at 4:53 PM, yongqinchuan du <duqc...@gmail.com> wrote:

I wondering if there is a way to add text or Scale into 3D plot?  Something like this in 2d plots below.

Hi,

There is not currently any text support in PyQtGraph's 3D graphics. There are a few options that you could try:

  - Render text to an image (using QPainter.drawText) and then display the image in the view

  - http://qt-project.org/doc/qt-4.8/qglwidget.html#renderText

Please note that this system will hopefully be replaced soon with VisPy, so I am generally not adding new features to it until that time.

[Miha Pirnat]

Hello,

would it be possible to use renderText in this way:

import pyqtgraph.opengl as gl
import pyqtgraph as pg
import PySide.QtCore as pqc
import PySide.QtGui as pqg

app = pqg.QApplication([])
w = gl.GLViewWidget()

w.show()

g = gl.GLGridItem()
w.addItem(g)

w.qglColor(pqc.Qt.white)
w.renderText(0.,0.,0.,'text')

if __name__ == '__main__':
    pqg.QApplication.instance().exec_()

The above code runs, but text is not shown. I'm obviously doing something very wrong here as I am very new to pyQtgraph and also OpenGL.

Thank you for any help. 

[Luke Campagnola]

On Thu, Sep 4, 2014 at 3:05 PM, Miha Pirnat <miha.pi...@gmail.com> wrote:

Hello,

would it be possible to use renderText in this way:

import pyqtgraph.opengl as gl
import pyqtgraph as pg
import PySide.QtCore as pqc
import PySide.QtGui as pqg

app = pqg.QApplication([])
w = gl.GLViewWidget()

w.show()

g = gl.GLGridItem()
w.addItem(g)

w.qglColor(pqc.Qt.white)
w.renderText(0.,0.,0.,'text')

This should work if you make a subclass of GLViewWidget that calls renderText from inside its paintGL method:

class MyGLView(GLViewWidget):

    def paintGL(self, *args, **kwds):

        GLViewWidget.paintGL(self, *args, **kwds)

        self.qglColor(Qt.white)

        self.renderText(0, 0, 0, 'text')

[Miha Pirnat]

It works :). Thank you.

[Igor Shovkun]

Luke, could you just give one working example of how this rendering should look like?

[Muneeb Imran]

Hello Luke,

Could you please tell me the format or datatype used for qglColor. I am having issue passing any color. Or could you may be still have this working file, It would be helpful.

[Maher Albezem]

from PyQt5 import Qt
from PyQt5.QtGui import QColor
from pyqtgraph.opengl import GLViewWidget


class GLView(GLViewWidget):
    """
    I have implemented my own GLViewWidget
    """
    def __init__(self, parent=None):
        super().__init__(parent)

    def mouseReleaseEvent(self, ev):
        region = (ev.pos().x() - 5, ev.pos().y() - 5, 10, 10)
        print(self.itemsAt(region))

    def paintGL(self, *args, **kwds):
        GLViewWidget.paintGL(self, *args, **kwds)

        self.qglColor(QColor("k"))

        self.renderText(0, 0, 0, 'text')

[Nick PV]

I'm looking for the same thing (text / label rendering at 3D space) but I'm sorry it's not enough information here (in terms of implementation) to understand how to actually implement this feature.

For example I have this (one line plotting at 3D space), how to add a label near by it. 

code sample: 

import numpy as np
import pyqtgraph.opengl as gl
from pyqtgraph.Qt import QtWidgets
from pyqtgraph import Vector


class plot3D(object):
    def __init__(self):
        self.line_input = 0
        self.app = QtWidgets.QApplication(sys.argv)
        self.w = gl.GLViewWidget()

        axis = gl.GLAxisItem()
        self.w.addItem(axis)

    def plot_line(self):
        pl_line = np.array([(338.12, 508.03, 0.0), (338.12, 0.0, 0.0)])
        color = (250, 0, 0, 0.7)
        newline = gl.GLLinePlotItem(pos=pl_line, color=color, width=2, antialias=False)
        self.w.addItem(newline)
        self.w.show()

    def exec(self):
        self.app.exec()


pl3d = plot3D()
pl3d.plot_line()
pl3d.exec()