Archived:Using graphs in PySymbian

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08 Sep
2009

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Aquivado: Este artigo foi arquivado, pois o conteúdo não é mais considerado relevante para se criar soluções comerciais atuais. Se você achar que este artigo ainda é importante, inclua o template {{ForArchiveReview|escreva a sua justificativa}}.

All PySymbian articles have been archived. PySymbian is no longer maintained by Nokia and is not guaranteed to work on more recent Symbian devices. It is not possible to submit apps to Nokia Store.

This PySymbian code snippet shows how can to plot graphs for user given inputs.

Article Metadata

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Tested with

Devices(s): Nokia N96

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Compatibility

Platform(s): S60 2nd Edition, S60 3rd Edition

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Article

Keywords: graphics

Created: ck.umraliya (19 Jul 2008)

Last edited: hamishwillee (08 May 2013)

Code

# import modules
import e32, appuifw,graphics
 
# Define quit function
def quit():
    app_lock.signal()                       
 
def draw():
 
    # Get number of graphs
    t = appuifw.query(u"Enter Number Of Graphs: (Max 9)","number")
 
    #title of the application
    appuifw.app.title = u"Graphs"
 
    # Get range
    rrng = appuifw.query(u"Maximum Range Of Graph:","number")
 
    # Graph colors
    colors = [0x0000ff,0x00ff00,0xff0000,0xffff00,0xc0c0c0,0x808040,0xff00ff,0xf0cb75,0xbe6a0e]
 
    # Get graph prameters
    y = []
    n = []
    for j in range(t):
        (n1,y1) = appuifw.multi_query(u"Title Of Graph %d:"%(j+1),u"Height Of Graph %d:"%(j+1))
        n.append(n1)
        y11 = int(y1)
        y.append(y11)
 
    # Define canvas
    canvas=appuifw.Canvas()
    appuifw.app.body=canvas
    xx,yy = canvas.size
 
    # Scaling Graphs according to screen size
    arrg = float(yy-50)
    mf = arrg/rrng
 
    # Draw x,y axis
    canvas.line((20,yy-20,xx-32,yy-20), 0)
    canvas.line((xx-33,10,xx-33,yy-20),0)
 
    # Put indicator points
    canvas.text((xx-34,30+(yy-40)*0.75),u"_%d"%(rrng*0.25))
    canvas.text((xx-34,30+(yy-40)*0.5),u"_%d"%(rrng/2))
    canvas.text((xx-34,30+(yy-40)*0.25),u"_%d"%(rrng*0.75))
    canvas.text((xx-34,30),u"_%d"%(rrng))
 
    # Draw graphs
    h = 30
    for i in range(t):
        w=(xx-57)/t - 10
        s = yy-20-mf*y[i]
        canvas.rectangle((h,s,h+w,yy-20), outline=0x000000, fill=colors[i])
        x11 = str(y[i])
        canvas.text((h,(s-5)),u" %s"%(x11), fill=colors[i])
        canvas.text((h,yy), u"%s"%(n[i]), fill=0x4b2192)
        h=h+w+10
draw()
 
#the code will allow the user to exit the application when he presses the exit key
appuifw.app.exit_key_handler=quit  
app_lock=e32.Ao_lock()
app_lock.wait()

Postconditions

Once the graph is drawn a screenshot function can be used to save the image if user wants. Following images are the outcome of above code.

Number of Graphs

Maximum Range

Graph Parameters

Plotted Graphs

Related Links

Plotting Graphs in Python