Archived:How to draw on canvas in PySymbian

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Aquivado: 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

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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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Article

Keywords: graphics, canvas

Created: cyke64 (15 Mar 2007)

Last edited: hamishwillee (08 May 2013)

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