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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}}.

All PySymbian articles have been archived. PySymbian is no longer maintained by Nokia and is not guaranteed to work on more recent Symbian devices.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

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

Contents

Overview

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

Code

# mincanvas.py : minimal canvas example
# It draws to screen directly (doesn't use canvas callback)
 
 
import e32, appuifw, graphics, sysinfo
from key_codes import *
 
app = appuifw.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)
e32.ao_sleep(0.1)

Postconditions

Lines on Screen












Related Links

Archived:How to use Canvas in PySymbian

This page was last modified on 31 May 2013, at 04:03.
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