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‎README.md

Lines changed: 101 additions & 101 deletions
Original file line numberDiff line numberDiff line change
@@ -1683,107 +1683,6 @@ def get_border(screen):
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```
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Image
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-----
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```python
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# $ pip3 install pillow
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from PIL import Image
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```
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#### Creates PNG image of rainbow gradient:
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```python
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width = 100
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height = 100
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size = width * height
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pixels = [255 * i/size for i in range(size)]
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img = Image.new('HSV', (width, height))
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img.putdata([(int(a), 255, 255) for a in pixels])
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img.convert(mode='RGB').save('test.png')
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```
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#### Adds noise to PNG image:
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```python
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from random import randint
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add_noise = lambda value: max(0, min(255, value + randint(-20, 20)))
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img = Image.open('test.png').convert(mode='HSV')
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img.putdata([(add_noise(h), s, v) for h, s, v in img.getdata()])
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img.convert(mode='RGB').save('test.png')
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```
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### Modes
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* **`'1'` - 1-bit pixels, black and white, stored with one pixel per byte.**
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* **`'L'` - 8-bit pixels, greyscale.**
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* **`'RGB'` - 3x8-bit pixels, true color.**
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* **`'RGBA'` - 4x8-bit pixels, true color with transparency mask.**
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* **`'HSV'` - 3x8-bit pixels, Hue, Saturation, Value color space.**
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Audio
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-----
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```python
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import wave
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from struct import pack, iter_unpack
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```
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### Read Frames from WAV File
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```python
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def read_wav_file(filename):
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with wave.open(filename, 'rb') as wf:
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frames = wf.readframes(wf.getnframes())
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return [a[0] for a in iter_unpack('<h', frames)]
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```
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### Write Frames to WAV File
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```python
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def write_to_wav_file(filename, frames_int):
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frames_short = (pack('<h', a) for a in frames_int)
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with wave.open(filename, 'wb') as wf:
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wf.setnchannels(1)
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wf.setsampwidth(2)
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wf.setframerate(44100)
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wf.writeframes(b''.join(frames_short))
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```
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### Examples
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#### Saves a sine wave to a WAV file:
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```python
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from math import pi, sin
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sin_f = lambda i: sin(i * 2 * pi * 440 / 44100)
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frames_f = (sin_f(a) for a in range(100000))
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frames_i = (int(a * 30000) for a in frames_f)
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write_to_wav_file('test.wav', frames_i)
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```
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#### Adds noise to a WAV file:
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```python
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from random import randint
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add_noise = lambda value: max(-32768, min(32768, value + randint(-500, 500)))
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frames_i = read_wav_file('test.wav')
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frames_i = (add_noise(a) for a in frames_i)
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write_to_wav_file('test.wav', frames_i)
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```
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#### Plays Popcorn:
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```python
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# pip3 install simpleaudio
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import simpleaudio, math, struct
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from itertools import chain, repeat
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F = 44100
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P1 = '71♪,69,,71♪,66,,62♪,66,,59♪,,,'
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P2 = '71♪,73,,74♪,73,,74,,71,,73♪,71,,73,,69,,71♪,69,,71,,67,,71♪,,,'
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get_pause = lambda seconds: repeat(0, int(seconds * F))
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sin_f = lambda i, hz: math.sin(i * 2 * math.pi * hz / F)
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get_wave = lambda hz, seconds: (sin_f(i, hz) for i in range(int(seconds * F)))
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get_hz = lambda n: 8.176 * 2 ** (int(n) / 12)
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parse_n = lambda note: (get_hz(note[:2]), 0.25 if len(note) > 2 else 0.125)
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get_note = lambda note: get_wave(*parse_n(note)) if note else get_pause(0.125)
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frames_i = chain.from_iterable(get_note(n) for n in f'{P1}{P1}{P2}'.split(','))
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frames_b = b''.join(struct.pack('<h', int(a * 30000)) for a in frames_i)
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simpleaudio.play_buffer(frames_b, 1, 2, F)
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```
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Scraping
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--------
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```python
@@ -2016,6 +1915,107 @@ right = [[0.1, 0.6, 0.8], [0.1, 0.6, 0.8], [0.1, 0.6, 0.8]] # Shape: (3, 3) <-
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```
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Image
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-----
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```python
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# $ pip3 install pillow
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from PIL import Image
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```
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#### Creates PNG image of rainbow gradient:
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```python
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width = 100
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height = 100
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size = width * height
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pixels = [255 * i/size for i in range(size)]
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img = Image.new('HSV', (width, height))
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img.putdata([(int(a), 255, 255) for a in pixels])
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img.convert(mode='RGB').save('test.png')
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```
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#### Adds noise to a PNG image:
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```python
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from random import randint
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add_noise = lambda value: max(0, min(255, value + randint(-20, 20)))
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img = Image.open('test.png').convert(mode='HSV')
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img.putdata([(add_noise(h), s, v) for h, s, v in img.getdata()])
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img.convert(mode='RGB').save('test.png')
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```
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### Modes
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* **`'1'` - 1-bit pixels, black and white, stored with one pixel per byte.**
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* **`'L'` - 8-bit pixels, greyscale.**
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* **`'RGB'` - 3x8-bit pixels, true color.**
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* **`'RGBA'` - 4x8-bit pixels, true color with transparency mask.**
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* **`'HSV'` - 3x8-bit pixels, Hue, Saturation, Value color space.**
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Audio
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-----
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```python
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import wave
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from struct import pack, iter_unpack
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```
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### Read Frames from WAV File
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```python
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def read_wav_file(filename):
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with wave.open(filename, 'rb') as wf:
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frames = wf.readframes(wf.getnframes())
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return [a[0] for a in iter_unpack('<h', frames)]
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```
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### Write Frames to WAV File
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```python
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def write_to_wav_file(filename, frames_int):
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frames_short = (pack('<h', a) for a in frames_int)
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with wave.open(filename, 'wb') as wf:
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wf.setnchannels(1)
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wf.setsampwidth(2)
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wf.setframerate(44100)
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wf.writeframes(b''.join(frames_short))
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```
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### Examples
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#### Saves a sine wave to a WAV file:
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```python
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from math import pi, sin
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sin_f = lambda i: sin(i * 2 * pi * 440 / 44100)
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frames_f = (sin_f(a) for a in range(100000))
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frames_i = (int(a * 30000) for a in frames_f)
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write_to_wav_file('test.wav', frames_i)
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```
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#### Adds noise to a WAV file:
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```python
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from random import randint
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add_noise = lambda value: max(-32768, min(32768, value + randint(-500, 500)))
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frames_i = read_wav_file('test.wav')
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frames_i = (add_noise(a) for a in frames_i)
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write_to_wav_file('test.wav', frames_i)
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```
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#### Plays Popcorn:
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```python
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# pip3 install simpleaudio
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import simpleaudio, math, struct
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from itertools import chain, repeat
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F = 44100
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P1 = '71♪,69,,71♪,66,,62♪,66,,59♪,,,'
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P2 = '71♪,73,,74♪,73,,74,,71,,73♪,71,,73,,69,,71♪,69,,71,,67,,71♪,,,'
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get_pause = lambda seconds: repeat(0, int(seconds * F))
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sin_f = lambda i, hz: math.sin(i * 2 * math.pi * hz / F)
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get_wave = lambda hz, seconds: (sin_f(i, hz) for i in range(int(seconds * F)))
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get_hz = lambda n: 8.176 * 2 ** (int(n) / 12)
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parse_n = lambda note: (get_hz(note[:2]), 0.25 if len(note) > 2 else 0.125)
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get_note = lambda note: get_wave(*parse_n(note)) if note else get_pause(0.125)
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frames_i = chain.from_iterable(get_note(n) for n in f'{P1}{P1}{P2}'.split(','))
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frames_b = b''.join(struct.pack('<h', int(a * 30000)) for a in frames_i)
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simpleaudio.play_buffer(frames_b, 1, 2, F)
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```
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20192019
Basic Script Template
20202020
---------------------
20212021
```python

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