DZone Snippets: note code

Showing message on status bar

korakot (Korakot Chaovavanich) — Mon, 06 Mar 2006 20:58:42 GMT

There's an empty space below app.title that we can
use as a status bar. So, I modify this recipe and
make it into a module. (need fgimage.pyd from here)



# status.py

from graphics import *

import fgimage

__all__ = ["status_on", "status_off"]



bar = Image.new((119,13))

bgcolor = screenshot().getpixel((0,0))[0]

fg = fgimage.FGImage()



def status_on(message=None):

    if message is not None:

        bar.clear(bgcolor)

        bar.text((0,11), unicode(message), 0xffffff)

    fg.set(57,30, bar._bitmapapi())



def status_off():

    fg.unset()

You can use it easily this way



>>> from status import *

>>> status_on('Hello world')  # show it

>>> status_off()              # hide it

>>>

See a screenshot.

MIDI Note number and frequency

korakot (Korakot Chaovavanich) — Fri, 10 Feb 2006 08:27:27 GMT

Summary of MIDI Note Numbers
MIDI Note to Frequency

I can use them with my midi snippet.



# from http://logic-users.org/forums/L-OT/295

# Each note's frequency is 2^(1/12) times of the previous note.



freq = 440 * 2^((n-69)/12)

n = 69 + 12*log(freq/440)/log(2)



# Doe, ray, me, fa, sol, la, tee, doe

>>> play([(i, 100) for i in [60, 62, 64,65, 67, 69, 71,72]])

appuifw.note allow global note in pys60 1.3.1

korakot (Korakot Chaovavanich) — Sun, 05 Feb 2006 20:42:53 GMT



# note in 1.2 

note(text, type)

# note in 1.3.1

note(text[, type[, global]])

type = 'info' (default) or 'error', 'conf'
global = 1 # display even if app is in background



import appuifw

appuifw.note(u'Hello World')             # simplest case

appuifw.note(u'Cannot connect', 'error') # show error

appuifw.note(u'New message', 'info', 1)  # alert from background

Using foreground image

korakot (Korakot Chaovavanich) — Mon, 31 Oct 2005 00:26:37 GMT

You can draw directly to the phone screen.
It is useful for a notification from a background program.
You need to install fgimage.pyd from here.



import fgimage, e32



img = Image.new((100, 16))  # create a notification text

img.text((0, 14), u'Hello world', 0)



fg = fgimage.FGImage()

x, y = 0, 40           # position to draw

fg.set(x, y, img._bitmapapi())  # send it



e32.ao_sleep(1)

fg.unset()                # then clear it

See (a bit) more discussion here.

Generate and play midi on mobile phone

korakot (Korakot Chaovavanich) — Wed, 10 Aug 2005 00:37:27 GMT

From a previous snippet, you can play any sound file
(including midi) with pys60.
http://bigbold.com/snippets/posts/show/400

Now, what if you can generate a midi file as well?
I found a pure python midi file library.
http://www.mxm.dk/products/public/pythonmidi

I modify it a bit, just to make a single file for easy download.
http://larndham.net/service/pys60/smidi.py
With it, you can play a single note with the following code.



>>> import smidi

>>> m = smidi.MidiOutFile('C:\\out.mid')

>>> m.header()

>>> m.start_of_track()

>>> m.update_time(0)

>>> m.note_on(note=0x40)  # single note

>>> m.update_time(192)

>>> m.note_off(note=0x40) # stop it after 192

>>> m.update_time(0)

>>> m.end_of_track()

>>> m.eof()



>>> from audio import Sound

>>> s = Sound.open('C:\\out.mid')

>>> s.play()

>>> s.close()

These 10 lines can be made into a simple function.
Then, you can just type a line and play any note you like
on you mobile phone.



>>> from smidi import play

>>> play([(64,192), (32, 192)])

Ah... so pythonic. ^_^