Archived:Using graphs in PySymbian

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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Platform Security

Capabilities: )

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Article

Keywords: graphics

Created: ck.umraliya (19 Jul 2008)

Last edited: hamishwillee (14 Sep 2012)

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