Python：在PyQt4中嵌入Chaco的秘密

Question

我该如何将Chaco添加到现有的PyQt4应用程序中？

长时间的搜索并没有什么收获（请自行搜索）。到目前为止，我已经确定需要以下几行代码：

import os
os.environ['ETS_TOOLKIT']='qt4'

我在互联网上找不到任何PyQt4-Chaco的代码。

如果有人填写空白部分，向我展示最简单的折线图（带有2个点），我将非常感激。

from PyQt4 import QtCore, QtGui
import sys
import os
os.environ['ETS_TOOLKIT']='qt4'

from enthought <blanks>
:
:

app = QtGui.QApplication(sys.argv)
main_window = QtGui.QMainWindow()
main_window.setCentralWidget(<blanks>)
main_window.show()
app.exec_()
print('bye')

Chaco/Enthought 的哪个类继承自 QWidget？

- random guy

Answer 1

我今天看到了这个。将Chaco嵌入Qt和WX中是完全可能且相当简单的。事实上，当您的ETS_TOOLKIT环境变量设置为“qt4”时，所有示例都会执行此操作。(Chaco需要有一个底层GUI工具包。)

我编写了一个小型的独立示例，填充了您的代码模板中的空白，并演示了如何在Qt窗口中嵌入chaco Plot。

qt_example.py: qt_example.py:

"""
Example of how to directly embed Chaco into Qt widgets.

The actual plot being created is drawn from the basic/line_plot1.py code.
"""

import sys
from numpy import linspace
from scipy.special import jn
from PyQt4 import QtGui, QtCore

from enthought.etsconfig.etsconfig import ETSConfig
ETSConfig.toolkit = "qt4"
from enthought.enable.api import Window

from enthought.chaco.api import ArrayPlotData, Plot
from enthought.chaco.tools.api import PanTool, ZoomTool


class PlotFrame(QtGui.QWidget):
    """ This widget simply hosts an opaque enthought.enable.qt4_backend.Window
    object, which provides the bridge between Enable/Chaco and the underlying
    UI toolkit (qt4).  This code is basically a duplicate of what's in
    enthought.enable.example_support.DemoFrame, but is reproduced here to
    make this example more stand-alone.
    """
    def __init__(self, parent, **kw):
        QtGui.QWidget.__init__(self)

def create_chaco_plot(parent):
    x = linspace(-2.0, 10.0, 100)
    pd = ArrayPlotData(index = x)
    for i in range(5):
        pd.set_data("y" + str(i), jn(i,x))

    # Create some line plots of some of the data
    plot = Plot(pd, title="Line Plot", padding=50, border_visible=True)
    plot.legend.visible = True
    plot.plot(("index", "y0", "y1", "y2"), name="j_n, n<3", color="red")
    plot.plot(("index", "y3"), name="j_3", color="blue")

    # Attach some tools to the plot
    plot.tools.append(PanTool(plot))
    zoom = ZoomTool(component=plot, tool_mode="box", always_on=False)
    plot.overlays.append(zoom)

    # This Window object bridges the Enable and Qt4 worlds, and handles events
    # and drawing.  We can create whatever hierarchy of nested containers we
    # want, as long as the top-level item gets set as the .component attribute
    # of a Window.
    return Window(parent, -1, component = plot)

def main():
    app = QtGui.QApplication(sys.argv)
    main_window = QtGui.QMainWindow(size=QtCore.QSize(500,500))

    enable_window = create_chaco_plot(main_window)

    # The .control attribute references a QWidget that gives Chaco events
    # and that Chaco paints into.
    main_window.setCentralWidget(enable_window.control)

    main_window.show()
    app.exec_()

if __name__ == "__main__":
    main()

- Peter Wang

Answer 2

以下是您所需要的内容：

import os, sys
os.environ['ETS_TOOLKIT'] = 'qt4'

from PyQt4 import QtGui
app = QtGui.QApplication(sys.argv)
from numpy import linspace, pi, sin
from enthought.enable.api import Component, Container, Window
from enthought.chaco.api import create_line_plot, \
                                add_default_axes, \
                                add_default_grids, \
                                OverlayPlotContainer


x = linspace(-pi,pi,100)
y = sin(x)
plot = create_line_plot((x,y))
add_default_grids(plot)
add_default_axes(plot)
container = OverlayPlotContainer(padding = 50)
container.add(plot)
plot_window = Window(None, -1, component=container)
plot_window.control.setWindowTitle('hello')
plot_window.control.resize(400,400)
plot_window.control.show()

app.exec_()

plot_window.control继承自QWidget。

- bandana

---

请注意：在任何 Enthought 导入语句之前，必须先添加 app = QtGui.QApplication(sys.argv) 这一行。 - random guy

Answer 3

我不知道Chaco，但我正在使用VTK，这里是绘制一些线条的代码，它们具有(x，y，z)坐标。

    """Define an actor and its properties, to be drawn on the scene using 'lines' representation."""
    ren = vtk.vtkRenderer()
    apd=vtk.vtkAppendPolyData()

    for i in xrange(len(coordinates)):
        line=vtk.vtkLineSource()

        line.SetPoint1(coordinates[i][0]) # 1st atom coordinates for a given bond
        line.SetPoint2(coordinates[i][1]) # 2nd atom coordinates for a given bond
        line.SetResolution(21)
        apd.AddInput(line.GetOutput())

    mapper = vtk.vtkPolyDataMapper()
    mapper.SetInput(apd.GetOutput())
    lines_actor = vtk.vtkActor()
    lines_actor.SetMapper(mapper)
    lines_actor.GetProperty().SetColor(colorR, colorG, colorB)
    lines_actor.GetProperty().SetOpacity(opacity)

        # Add newly created actor to the renderer.
        self.ren.AddViewProp(actor) # Prop is the superclass of all actors, composite props etc.
        # Update renderer.
        self.ren.GetRenderWindow().Render()

它使用QVTKRenderWindowInteractor与PyQT4进行交互。

- Piotr Byzia

Answer 4

我不了解Chaco，但是快速查看告诉我这是不可能的。

Chaco和PyQt都是用于与用户交互的图形工具包。Chaco面向绘图，而PyQt面向应用程序。每个工具包都有自己的窗口管理方式，如何检测用户点击，如何处理绘制事件等，以避免混淆。

如果您需要绘图软件，可以尝试使用matplotlib生成静态图像，并在PyQt中显示该图像。或者尝试基于PyQt的图形或绘图工具包。

- Philippe F

---

我发现matplotlib：

1. 对我的需求来说太慢了
2. 不如chaco具有交互功能
3. 在设计上有些古怪。

- random guy

我知道Chaco可以与PyQt（和wx）一起使用。不幸的是，Chaco在这个问题和其他方面缺乏良好的文档。 - random guy