matplotlib繫結到PyQt5（有選單）

稍微複雜地實現matplotlib繫結到pyqt5（有選單）

【知識點】

import

matplotlib
matplotlib.use(
"qt5agg
")

【源**】

1import

sys2

import

random34

import

matplotlib

5 matplotlib.use("

qt5agg")

67from pyqt5 import

qtcore

8from pyqt5.qtwidgets import910

from numpy import

arange, sin, pi

11from matplotlib.backends.backend_qt5agg import

figurecanvasqtagg as figurecanvas

12from matplotlib.figure import

figure

1314

15class

mymplcanvas(figurecanvas):

16"""

這是乙個視窗部件，即qwidget（當然也是figurecanvasagg）

"""17

def__init__(self, parent=none, width=5, height=4, dpi=100):

18 fig = figure(figsize=(width, height), dpi=dpi)

19 self.axes = fig.add_subplot(111)20#

每次plot()呼叫的時候，我們希望原來的座標軸被清除(所以false)

21self.axes.hold(false)

2223

self.compute_initial_figure()

2425

#26 figurecanvas.__init__

(self, fig)

27self.setparent(parent)

2829

figurecanvas.setsizepolicy(self,

30qsizepolicy.expanding,

31qsizepolicy.expanding)

32figurecanvas.updategeometry(self)

3334

defcompute_initial_figure(self):

35pass

3637

class

mystaticmplcanvas(mymplcanvas):

38"""

靜態畫布：一條正弦線

"""39

defcompute_initial_figure(self):

40 t = arange(0.0, 3.0, 0.01)

41 s = sin(2*pi*t)

42self.axes.plot(t, s)

4344

45class

mydynamicmplcanvas(mymplcanvas):

46"""

動態畫布：每秒自動更新，更換一條折線。

"""47

def__init__(self, *args, **kwargs):

48 mymplcanvas.__init__(self, *args, **kwargs)

49 timer =qtcore.qtimer(self)

50timer.timeout.connect(self.update_figure)

51 timer.start(1000)

5253

defcompute_initial_figure(self):

54 self.axes.plot([0, 1, 2, 3], [1, 2, 0, 4], 'r'

)5556def

update_figure(self):57#

構建4個隨機整數，位於閉區間[0, 10]

58 l = [random.randint(0, 10) for i in range(4)]

5960 self.axes.plot([0, 1, 2, 3], l, 'r'

)61self.draw()

6263

class

64def

__init__

(self):

65 qmainwindow.__init__

(self)

66self.setattribute(qtcore.qt.wa_deleteonclose)

67 self.setwindowtitle("

程式主視窗")

6869 self.file_menu = qmenu('

&file

', self)

70 self.file_menu.addaction('

&quit

', self.filequit,

71 qtcore.qt.ctrl +qtcore.qt.key_q)

72self.menubar().addmenu(self.file_menu)

7374 self.help_menu = qmenu('

&help

', self)

75self.menubar().addseparator()

76self.menubar().addmenu(self.help_menu)

7778 self.help_menu.addaction('

&about

', self.about)

7980 self.main_widget =qwidget(self)

8182 l =qvboxlayout(self.main_widget)

83 sc = mystaticmplcanvas(self.main_widget, width=5, height=4, dpi=100)

84 dc = mydynamicmplcanvas(self.main_widget, width=5, height=4, dpi=100)

85l.addwidget(sc)

86l.addwidget(dc)

8788

self.main_widget.setfocus()

89self.setcentralwidget(self.main_widget)90#

狀態條顯示2秒

91 self.statusbar().showmessage("

matplotlib 萬歲!

", 2000)

9293

deffilequit(self):

94self.close()

9596

defcloseevent(self, ce):

97self.filequit()

9899

defabout(self):

100 qmessagebox.about(self, "

about",

101"""

embedding_in_qt5.py example

102103

104105

canvases. it is base on example from matplolib documentation, and initially was

106developed from florent rougon and darren dale.

107108

109110

it may be used and modified with no restriction; raw copies as well as

111modified versions may be distributed without limitation.

112"""

113)

114115

if__name__ == '

__main__':

117119 aw.setwindowtitle("

pyqt5 與 matplotlib 例子")

120aw.show()

121#

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