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# Archived:Using graphs in PySymbian

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

Tested with
Devices(s): Nokia N96

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

Article
Keywords: graphics
Created: ck.umraliya (19 Jul 2008)
Last edited: hamishwillee (31 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