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Archived:How to draw on canvas in PySymbian

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Archived.pngAquivado: 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}}.

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Article Metadata
Tested with
Devices(s): Nokia N96
Platform(s): S60 2nd Edition, S60 3rd Edition
Keywords: graphics, canvas
Created: cyke64 (15 Mar 2007)
Last edited: hamishwillee (31 May 2013)



With this Python code snippet you can draw simple lines by pressing direction keys.


# : minimal canvas example
# It draws to screen directly (doesn't use canvas callback)
import e32, appuifw, graphics, sysinfo
from key_codes import *
app =
screen_x, screen_y = sysinfo.display_pixels() # Get screen size
# Global variables
x = y = 0
vx = vy = 1
running = 1
# Exit function
def set_exit():
global running
running = 0
def add_dir(dx, dy):
global vx, vy
vx += dx
vy += dy
# change screen, body
app.screen = 'full'
c = appuifw.Canvas()
app.body = c
# bind 6 keys
app.exit_key_handler= set_exit
c.bind(EKeyRightArrow,lambda:add_dir(1, 0))
c.bind(EKeyLeftArrow,lambda:add_dir(-1, 0))
c.bind(EKeyUpArrow,lambda:add_dir(0, -1))
c.bind(EKeyDownArrow,lambda:add_dir(0, 1))
c.bind(EKeyDevice3, c.clear) # press joy stick
# main loop
while running:
# move x, y
x = (x + vx) % screen_x
y = (y + vy) % screen_y
# plot a red dot at (x, y)
app.body.point((x, y), 0xff0000)


Lines on Screen

Related Links

Archived:How to use Canvas in PySymbian

This page was last modified on 31 May 2013, at 01:03.
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