Graphs/statistics using wxPython

**Robert Kern** · Jul 19 '05, 02:29 AM

Re: Graphs/statistics using wxPython

Jan Danielsson wrote:[color=blue]
> Hello all,
>
> I wanted to plot some statistics, so I wrote a simple wxPython class
> to do it. Then I realized that I would like to draw bar graphs, so I
> added that too.
>
> Since I'm a complete Python newbie, I haven't done much of it the
> "Python way", I suspect. So, I'm wondering if someone would like to show
> me some of the tricks I should have used.[/color]

Trick #1:

import matplotlib

;-)

--
Robert Kern
rkern@ucsd.edu

"In the fields of hell where the grass grows high
Are the graves of dreams allowed to die."
-- Richard Harter

**Jan Danielsson** · Jul 19 '05, 02:29 AM

Re: Graphs/statistics using wxPython

Robert Kern wrote:[color=blue][color=green]
>> I wanted to plot some statistics, so I wrote a simple wxPython class
>> to do it. Then I realized that I would like to draw bar graphs, so I
>> added that too.
>>
>> Since I'm a complete Python newbie, I haven't done much of it the
>> "Python way", I suspect. So, I'm wondering if someone would like to show
>> me some of the tricks I should have used.[/color]
>
>
> Trick #1:
>
> import matplotlib[/color]

Oh. :-)

That's a pretty neat trick -- now can you make my embarrassment go away?

I did do a quick search to see if anyone had done anything similar;
but I guess I wasn't using the right keywords.
[color=blue]
> ;-)[/color]

You may point and laugh.

Damn, that's a neat toolkit! Thanks for pointing me to it!

**Robert Kern** · Jul 19 '05, 02:29 AM

Re: Graphs/statistics using wxPython

Jan Danielsson wrote:[color=blue]
> Robert Kern wrote:[/color]
[color=blue][color=green]
>>Trick #1:
>>
>>import matplotlib[/color]
>
> Oh. :-)
>
> That's a pretty neat trick -- now can you make my embarrassment go away?
>
> I did do a quick search to see if anyone had done anything similar;
> but I guess I wasn't using the right keywords.
>[color=green]
>>;-)[/color]
>
> You may point and laugh.
>
> Damn, that's a neat toolkit! Thanks for pointing me to it![/color]

It's okay. Just about every Pythonista in the sciences has, at one time
or another, started a plotting library. It's a rite of passage. Welcome
to the club. :-)

--
Robert Kern
rkern@ucsd.edu

"In the fields of hell where the grass grows high
Are the graves of dreams allowed to die."
-- Richard Harter

**Jan Danielsson** · Jul 19 '05, 02:29 AM

Re: Graphs/statistics using wxPython

Robert Kern wrote:
[---][color=blue]
> It's okay. Just about every Pythonista in the sciences has, at one time
> or another, started a plotting library. It's a rite of passage. Welcome
> to the club. :-)[/color]

Question: I need to install SciPy in order to use matplotlib, but on
the download page I see that there are versions for Python 2.2.x and
2.3.x. I use 2.4.1 -- will bad things happen if I try to use the build
for 2.3.x?

**Robert Kern** · Jul 19 '05, 02:29 AM

Re: Graphs/statistics using wxPython

Jan Danielsson wrote:[color=blue]
> Robert Kern wrote:
> [---]
>[color=green]
>>It's okay. Just about every Pythonista in the sciences has, at one time
>>or another, started a plotting library. It's a rite of passage. Welcome
>>to the club. :-)[/color]
>
> Question: I need to install SciPy in order to use matplotlib,[/color]

No you don't.
[color=blue]
> but on
> the download page I see that there are versions for Python 2.2.x and
> 2.3.x. I use 2.4.1 -- will bad things happen if I try to use the build
> for 2.3.x?[/color]

Yes. Scipy has many extension modules; such modules built for 2.3.x
won't work for 2.4.x, etc.

--
Robert Kern
rkern@ucsd.edu

"In the fields of hell where the grass grows high
Are the graves of dreams allowed to die."
-- Richard Harter

**Jan Danielsson** · Jul 19 '05, 02:29 AM

Re: Graphs/statistics using wxPython

Robert Kern wrote:[color=blue][color=green]
>> [---]
>>[color=darkred]
>>> It's okay. Just about every Pythonista in the sciences has, at one time
>>> or another, started a plotting library. It's a rite of passage. Welcome
>>> to the club. :-)[/color]
>>
>>
>> Question: I need to install SciPy in order to use matplotlib,[/color]
>
> No you don't.[/color]

Ah.. I misread. I read
http://matplotlib.sourceforge.net/installing.html, the section which
describes what "enthought python" contains, and thought it meant "this
is relevant to matplot lib".
[color=blue][color=green]
>> but on
>> the download page I see that there are versions for Python 2.2.x and
>> 2.3.x. I use 2.4.1 -- will bad things happen if I try to use the build
>> for 2.3.x?[/color]
>
> Yes. Scipy has many extension modules; such modules built for 2.3.x
> won't work for 2.4.x, etc.[/color]

So, for future reference: I should *never* mix x and y versions in
verion: x.y.z. I've wondered why there are versions of libraries for
different versions of Python..

**Robert Kern** · Jul 19 '05, 02:29 AM

Re: Graphs/statistics using wxPython

Jan Danielsson wrote:
[color=blue]
> So, for future reference: I should *never* mix x and y versions in
> verion: x.y.z. I've wondered why there are versions of libraries for
> different versions of Python..[/color]

For packages with extension modules at least. Python maintains binary
compatibility between micro-releases (i.e. different z).

--
Robert Kern
rkern@ucsd.edu

"In the fields of hell where the grass grows high
Are the graves of dreams allowed to die."
-- Richard Harter

**Will McGugan** · Jul 19 '05, 02:29 AM

Re: Graphs/statistics using wxPython

Jan Danielsson wrote:[color=blue]
> Hello all,
>
> I wanted to plot some statistics, so I wrote a simple wxPython class
> to do it. Then I realized that I would like to draw bar graphs, so I
> added that too.
>
> Since I'm a complete Python newbie, I haven't done much of it the
> "Python way", I suspect. So, I'm wondering if someone would like to show
> me some of the tricks I should have used.
>
> You can find the code at:
> http://user.it.uu.se/~jada3673/drawtest.py
>
> It's not finished[*], but it is usable. Oh, you can do whatever you
> want with it. Since I had never touched wxPython before working with
> this, I used some doodle application as a starting point.
>
> Btw... Has anyone already written statistics classes for wxPython? If
> so, where can I find them? If nothing similar exists, I'll probably add
> support for loading data from a file, and a few other features. Feel
> free to make requests or enhancements.
>
>[*] There are some size/offset bugs which I am aware of, but they are
> easily fixed. I just haven't got around to it yet.[/color]

If you ever want to add an extra dimension, then using OpenGL with
wxWindows is a breeze. See attached file for a 3d pie char..

Will McGugan

--

http://www.willmcgugan.com

"".join({'*':'@ ','^':'.'}.get( c,0) or chr(97+(ord(c)-84)%26) for c in
"jvyy*jvyyzptht na^pbz")

# Pie Chart Window
# 2005 Will McGugan (will@willmcgug an.com)

import wx

from wx import glcanvas
from OpenGL.GL import *

import math
import time

sin = math.sin
cos = math.cos

PI = math.pi
def DegToRad(deg):
return deg*PI/180.

class PieSegment(obje ct):

def __init__(self, radius, angle1, angle2, colour, depth):

self.display_li st = glGenLists(1)

glNewList(self. display_list, GL_COMPILE)

self.angle1 = angle1
self.angle2 = angle2
self.explode_an gle = DegToRad( (angle2 + angle1) / 2.)
DrawPieSegment( radius, angle1, angle2, colour, depth)

glEndList()

def __del__(self):
glDeleteLists(s elf.display_lis t, 1)

def Draw(self, angle1, angle2, explode):

glPushMatrix()

glRotate(angle1 , 1.0, 0.0, 0.0);
glRotate(angle2 , 0.0, 0.0, 1.0);

glTranslatef( sin(self.explod e_angle)*explod e, cos(self.explod e_angle)*explod e, 0. )

glCallList(self .display_list)
glPopMatrix()

def DrawPieSegment( radius, angle1, angle2, colour, depth):

angle1 = DegToRad(angle1 )
angle2 = DegToRad(angle2 )

# Number of divisions in 360 degrees
RES = 100.

fan2D = []

step_degree = ((2*PI)/RES)
step_count = int( (angle2 - angle1) / step_degree ) + 1

step_degree = ( angle2 - angle1 ) / float(step_coun t)

# Precalculate the trig
sina1 = sin(angle1)
cosa1 = cos(angle1)

sina2 = sin(angle2)
cosa2 = cos(angle2)

# Calculate the points in an arc
for p in xrange(step_cou nt+1):

a = angle1 + p * step_degree

x = sin(a)
y = cos(a)

fan2D.append( (x,y) )

z1 = +depth/2.
z2 = -depth/2.

glMaterial(GL_F RONT, GL_DIFFUSE, [colour[0], colour[1], colour[2], 1.0])

# Create a fan for the top and bottom of the pie segment
glNormal(0, 0, +1.)
glBegin(GL_TRIA NGLE_FAN)
glVertex(0, 0, z1)
for x, y in fan2D:
glVertex(x*radi us, y*radius, z1)
glEnd()

glNormal(0, 0, -1.)
glBegin(GL_TRIA NGLE_FAN)
glVertex(0, 0, z2)
for x, y in fan2D:
glVertex(x*radi us, y*radius, z2)
glEnd()

# A strip for the curved edge
glBegin(GL_TRIA NGLE_STRIP)
for x, y in fan2D:
glNormal(x, y, 0.)
xr = x * radius
yr = y * radius
glVertex(xr, yr, z1)
glVertex(xr, yr, z2)
glEnd()

n1 = -cosa1, sina1, 0.
n2 = cosa2, -sina2, 0.

x1, y1 = sina1 * radius, cosa1 * radius
x2, y2 = sina2 * radius, cosa2 * radius

# Two quads for the radius edges

glNormal(n1)
glBegin(GL_QUAD S)

glVertex(0, 0, z1)
glVertex(x1, y1, z1)
glVertex(x1, y1, z2)
glVertex(0, 0, z2)

glEnd()

glNormal(n2)
glBegin(GL_QUAD S)

glVertex(0, 0, z1)
glVertex(x2, y2, z1)
glVertex(x2, y2, z2)
glVertex(0, 0, z2)

glEnd()

class PieChartWindow( glcanvas.GLCanv as):
def __init__(self, parent):

attriblist = None
glcanvas.GLCanv as.__init__(sel f, parent, -1, wx.DefaultPosit ion, wx.DefaultSize, 0, "GLCanvas", attriblist, wx.NullPalette)

self.init = False

self.segments = []

self.animating = False
self.angle = 0.
self.explode = 0.

self.downx = 0
self.rot = 0.

self.captured_m ouse = False

self.timer = wx.Timer(self)

self.Bind(wx.EV T_TIMER, self.OnTimer)
self.Bind(wx.EV T_LEFT_DOWN, self.OnLeftButt onDown)
self.Bind(wx.EV T_LEFT_UP, self.OnLeftButt onUp)
self.Bind(wx.EV T_MOTION, self.OnMouseMov e)
self.Bind(wx.EV T_ERASE_BACKGRO UND, self.OnEraseBac kground)
self.Bind(wx.EV T_SIZE, self.OnSize)
self.Bind(wx.EV T_PAINT, self.OnPaint)

def Animate(self):
self.animating = True
self.start_anim ate = time.clock()
self.timer.Star t(1000/20)

def OnTimer(self, event):
if self.IsShown():
self.Refresh()
if not self.animating:
self.timer.Stop ();

def SetSegments(sel f, segments, angle=0., radius=150., depth=50.):

self.segments = []

First = True

if len(segments):
angle = -(segments[0][0]/2. *360./100.)

for seg in segments:

seg_percent, colour = seg

if seg_percent == 0:
continue

if seg_percent < .2:
angle = angle + (seg_percent*36 0./100.)
continue

if First:
angle = -(seg_percent/2. * 360./100.)
First = False

next_angle = angle + (seg_percent*36 0./100.)
self.segments.a ppend(PieSegmen t(radius, angle, next_angle, colour, depth))
angle=next_angl e

def PerspectiveProj ection(self):

w, h = 300., 300.
a = 30.

tana = math.tan(DegToR ad(a/2.))

glMatrixMode(GL _PROJECTION);

v = (w/2) / tana

near = v / 10.

vw = tana * near
vh = tana * near

glFrustum(-vw, vw, -vh, vh, near, v*3.0);

glMatrixMode(GL _MODELVIEW);
glTranslatef(0. 0, 0.0, -v*1.2);

glLight(GL_LIGH T0, GL_POSITION, [w/2, h/2, v*1.2, 0.0]);

def InitGL(self):

self.Perspectiv eProjection()

glMaterial(GL_F RONT, GL_AMBIENT, [0.3, 0.3, 0.3, 1.0])
glMaterial(GL_F RONT, GL_DIFFUSE, [0.9, 0.9, 0.9, 1.0])
glMaterial(GL_F RONT, GL_SPECULAR, [1.0, 1.0, 1.0, 1.0])
glMaterial(GL_F RONT, GL_SHININESS, 70.0)
glLight(GL_LIGH T0, GL_AMBIENT, [0.25, 0.25, 0.25, 1.0])
glLight(GL_LIGH T0, GL_DIFFUSE, [1.0, 1.0, 1.0, 1.0])
glLight(GL_LIGH T0, GL_SPECULAR, [.1, .1, .1, 1.0])

glLightModel(GL _LIGHT_MODEL_AM BIENT, [0.2, 0.2, 0.2, 1.0])
glEnable(GL_LIG HTING)
glEnable(GL_LIG HT0)
glDepthFunc(GL_ LESS)
glEnable(GL_DEP TH_TEST)

glClearColor(1, 1,1,1)
glClear(GL_COLO R_BUFFER_BIT | GL_DEPTH_BUFFER _BIT)
glMatrixMode(GL _MODELVIEW);

def OnLeftButtonDow n(self, event):
self.downx = event.GetPositi on()[0]
self.captured_m ouse = True
self.CaptureMou se()

def OnLeftButtonUp( self, event):
if self.captured_m ouse and self.HasCapture ():
self.ReleaseMou se()

def OnMouseMove(sel f, event):
if event.Dragging( ) and event.LeftIsDow n():
mx, my = event.GetPositi on()
rot_delta = self.downx - mx
self.rot+= rot_delta
self.downx = mx
self.Refresh()

def OnEraseBackgrou nd(self, event):
pass

def OnSize(self, event):
size = self.GetClientS ize()
if self.GetContext ():
self.SetCurrent ()
glViewport(0, 0, size.width, size.height)
self.Refresh()
event.Skip()

def OnPaint(self, event):
dc = wx.PaintDC(self )
self.SetCurrent ()
if not self.init:
self.InitGL()
self.init = True

self.OnDraw()

def OnDraw(self):

glClear(GL_COLO R_BUFFER_BIT | GL_DEPTH_BUFFER _BIT);

if self.animating:

t = time.clock() - self.start_anim ate
if t < 1.:
self.angle = 0.
self.explode = 0.
elif t < 2.:
ts = t - 1.
self.angle = -50. * ts
elif t < 3.:
ts = t - 2.
self.angle = -50.
self.explode = 15. * ts
else:
self.animating = False
self.angle = -50.
self.explode = 15.

for segment in self.segments:

segment.Draw(se lf.angle, self.rot, self.explode)

self.SwapBuffer s()

if __name__ == "__main__":

class TestFrame(wx.Fr ame):
def __init__(self):
super(TestFrame , self).__init__( None, -1, "Pie Chart Test", style=wx.DEFAUL T_FRAME_STYLE)
self.SetClientS ize(wx.Size(300 ,300))

pie_chart = PieChartWindow( self)

# List of tuples ( <Percentage of Pie>, ( <Red>, <Green>, <Blue> ) )
seg = [ ( 20, (1., 0.1, 0.1) ),
( 25, (0.05, .9, .1) ),
( 10, (.2, 0.1, 1.) ),
( 30, (.8, .9, .1) ) ]

pie_chart.SetSe gments( seg )
pie_chart.Anima te()

app = wx.App()
frame = TestFrame()
frame.Show(True )
app.MainLoop()

Graphs/statistics using wxPython

Graphs/statistics using wxPython

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