Archived:Drawing a Calendar on PySymbian Canvas

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19 Sep
2009

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This article demonstrates how to draw a calendar on a canvas using PySymbian.

Article Metadata

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Tested with

Devices(s): N73, N95

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Compatibility

Platform(s): S60 3rd Edition, S60 5th Edition

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Article

Keywords: Calendar

Created: nirpsis (27 Jul 2009)

Last edited: hamishwillee (08 May 2013)

Introduction

The application uses the following modules:

• appuifw module
• graphics module
• e32 module

The following functions are used to create the canvas based calendar:

• draw_screen():draw the black screen on canvas
• draw_text():write some text on square
• print_number: print number on square

The following parameters are used when developing this application. They are customizable.

• number_of_square: Initialize number of column
• number_of_lines: Initialize number of row
• Horizontal_Separator: Separate the space between column
• Vertical_Separator: Separate the space between row

All the functions and parameters are defined in source code in detail.

Code snippet

The code for the calendar is below.

# import module
import appuifw,graphics,e32
 
# define color code
BLACK= (0,0,0)
RED=(255,0,0)
BLUE= (0,0,255)
GREEN=(0,255,0)
ORANGE= (255,127,0)
WHITE=(255,255,255)
global width,height
width=320
height=320
 
#Global variables
sqrt_x=width/16
sqrt_y=height/4
sqrt_width=30
sqrt_height=25
number_of_square=7
number_of_lines=6
Horizontal_Separator=3
Vertical_Separator=3
 
TextColor=RED
PrintNumber=WHITE
canvas=None
img=None
 
def handle_redraw(rect):    
   canvas.blit(img)
 
# exit function
def quit():
      app_lock.signal()
 
#---------------------------
#draw draw screen
#---------------------------
 
def draw_screen():
 
   #Global variable for application UI
   global canvas
 
   #Create an instance of Canvas and set it as the application's body
   canvas = appuifw.Canvas(redraw_callback = handle_redraw,event_callback = None)
   appuifw.app.body=canvas
 
   #Set the screen to full
   appuifw.app.screen = 'full'    
   appuifw.app.exit_key_handler=quit
 
   #Global variable for application UI
   global img
   img = graphics.Image.new(canvas.size)
 
   #Clear the image
   img.clear(BLACK)
   global x1,y1,x2,y2, sqrt_x, sqrt_y, sqrt_width, sqrt_height,number_of_square, Horizontal_Separator,Vertical_Separator,number_of_lines   
   for j in range(number_of_lines):
		#define rectangle coordinate
		x1=sqrt_x
		y1=sqrt_y+j*(sqrt_height+Vertical_Separator)
		x2=x1+sqrt_width
		y2=y1+sqrt_height
		for i in range(number_of_square):
		    #draw rectangle
			img.rectangle((x1+ i*sqrt_width,y1,x2+ i*sqrt_width-Horizontal_Separator,y2),outline=BLUE)            		    
		handle_redraw(None)
   Total_x, Total_y = canvas.size
   img.text((35,50), u"CALENDER", fill = BLUE,font=(u'Nokia Hindi S60',40,appuifw.STYLE_BOLD))
   handle_redraw(None)
 
#define draw_text function   
def draw_text():    
		  global sqrt_x,sqrt_y,t1,t2,sqrt_height,y3,x3, number_of_square
		  t1=5
		  t2=20
		  y3=sqrt_y+t2	
		  a=[u'S',u'M',u'T',u'W',u'T',u'F',u'S']
		  for i in range(1,number_of_square +1):
		    # draw text on canvas
			img.text((sqrt_x+i*t1+(i-1)*sqrt_height,y3), unicode(a[i-1]), fill=TextColor,font=(u'Nokia Hindi S60',20,appuifw.STYLE_BOLD))		
		  handle_redraw(None)
 
 
def draw_number(i, no_of_days_in_month):
    global number_of_lines, number_of_square
    a=1
    for j in range(number_of_lines-1):
		if i==number_of_square:
			i=0	
		t1=5		
		x1=sqrt_x
		y1=sqrt_y+(j+1)*sqrt_width+14	
		while i<number_of_square:
			img.text((x1+ i*sqrt_height+(i+1)*t1,y1),unicode(a),fill=PrintNumber)
			a+=1            		    
			i+=1
			if a==no_of_days_in_month+1:
				break
		handle_redraw(None)
		#a+=1
#calling the function		
draw_screen()
draw_text() 
draw_number(3,31)
app_lock=e32.Ao_lock()
 
#Wait for the user to request the exit
app_lock.wait()

Screenshots

Related links

• Introduction to PySymbian