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Dan Chen dannvix

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dannvix / Kirsch.rb
Created March 22, 2012 08:27
Kirsch filter with RMagick
class Kirsch
require 'RMagick'
include Magick
@@kernel = [
5, 5, -3, 5, 0, -3, -3, -3, -3,
5, 5, 5, -3, 0, -3, -3, -3, -3,
-3, 5, 5, -3, 0, 5, -3, -3, -3,
-3, -3, 5, -3, 0, 5, -3, -3, 5,
0, 0, 0, 0, 0, 0, 0, 0, 0,
@dannvix
dannvix / paint_text.py
Created March 24, 2012 10:02
Paint text on given image with PIL
#!/usr/bin/env python
#-*- encoding: utf8
# sudo easy_install PIL
import Image
import ImageFont
import ImageDraw
image = Image.open("image.png")
@dannvix
dannvix / paint_text.rb
Created March 24, 2012 10:32
Paint text on given image with RMagick
#!/usr/bin/env ruby
# encoding: utf-8
require 'RMagick'
include Magick
image = Image.read("image.png").first
text = Draw.new
text.annotate(image, 0, 0, 0, 60, "測試！Test!") {
@dannvix
dannvix / customized_combinations.rb
Created April 16, 2012 09:38
Customized format for combinations in Ruby
# for C(3, 1) it should returns %w(100 010 001)
def get_combinations (n, m)
(n.downto 1).to_a.combination(m).map do |c|
c.inject(0){ |s, k| s |= (1 << k-1) }.to_s(2).rjust(n, '0')
end
end
puts get_combinations(10, 5)
@dannvix
dannvix / PresentationMode.vim
Created April 21, 2012 12:52
toggle between working mode and presentation mode (for projection demo)
" toggle between working mode and presentation mode
function! PresentationModeOn()
set background=light
colorscheme github
set guifont=Monaco\ for\ Powerline:h28.00
endfunction
function! PresentationModeOff()
set background=dark
@dannvix
dannvix / bezier-curve.rb
Created December 24, 2012 12:42
simply draw Bezier curve and display, with RMagick
#!/usr/bin/env ruby
require 'RMagick'
include Magick
def tpow (t, pow_a, pow_b)
(t ** pow_a) * ((1 - t) ** pow_b)
end
# Bezier curve parameters
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dannvix / pinhole.sass
Created January 5, 2013 14:47
CSS with pseudo elements for the pinhole effect in https://fbcdn-sphotos-h-a.akamaihd.net/hphotos-ak-ash4/270216_4767240990899_1825438048_n.jpg
.item
width: 190px
position: absolute
.item:before
content: ''
width: 15px
height: 15px
@include border-radius(15px)
background: darken(white, 10%)
position: absolute
@dannvix
dannvix / www-proxy.c
Created January 30, 2013 06:47
very simple HTTP proxy server written by Steve Shipway
/* www-proxy.c Copyright Imperial Business Systems 1995
Proxy http server.
Written by Steve Shipway ([email protected],[email protected])
in the space of 2 hours. It took a further 1 hour to remove the last
bug. And 2 hours to persuade myself to stop playing with Netscape after it
was working.
Command line args:
-d : debug mode. Use port 8000 instead, dont background, status msgs
-l logfile : logfile to use
@dannvix
dannvix / sprintf.js
Created February 3, 2013 07:23
sprintf() implementation in JavaScript
function sprintf() {
var i = 0, a, f = arguments[i++], o = [], m, p, c, x, s = '';
while (f) {
if (m = /^[^\x25]+/.exec(f)) {
o.push(m[0]);
}
else if (m = /^\x25{2}/.exec(f)) {
o.push('%');
}
else if (m = /^\x25(?:(\d+)\$)?(\+)?(0|'[^$])?(-)?(\d+)?(?:\.(\d+))?([b-fosuxX])/.exec(f)) {
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dannvix / nginx_sendfile.rb
Created February 19, 2013 01:28
nginx_sendfile() for streaming mp4 to Safari from Nginx + Passenger + Rails
# customized sendfile() implementation utilizing Nginx's X-Accel-* header options
# needed ecause Rails' built-in sendfile() generates chunked response without Content-Length,
# and Safari rufuses to player videos coming in chunks......
def nginx_sendfile (file_path, options={})
response.headers["Cache-Control"] = options[:cache_control] || "max-age=86400, public"
response.headers["Content-Disposition"] = options[:disposition] || "inline"
response.headers["X-Accel-Limit-Rate"] = options[:limit_rate] || "307200" # byte
response.headers["X-Accel-Buffering"] = options[:buffering] || "yes"
response.headers["X-Accel-Redirect"] = file_path
render :nothing => true