DZone Snippets: color code

Ruby method to determine if a string would look more readable on black vs. white.

sikelianos (Zeke Sikelianos) — Fri, 02 May 2008 20:41:56 GMT

// description of your code here



def self.ideal_font_color_for(hex_str)

	hex_str = hex_str.split('#').last



	threshold = 105



	r = hex_str[0..1].hex

	g = hex_str[2..3].hex

	b = hex_str[4..5].hex



	delta = (r*0.299) + (g*0.587) + (b*0.114)



	255 - delta < threshold ? "#000000" : "#FFFFFF"

end

Print color highlighted strings to unix terminal

kedder (Andrey lebedev) — Wed, 30 Apr 2008 11:06:36 GMT

Sample of escape sequences needed to print in color to unix/linux terminal.



print x.replace('toostis', '\033[0;31mtoostis\033[m')

This will highlight all 'toostis' instances in x with red.

Retrieve the color from an SVG shape

jrobertson (James Robertson) — Sun, 30 Mar 2008 14:37:02 GMT



    y="120" width="20px" height="20px" fill="pink" stroke="blue" onclick="setPenColour(evt)"/>

    function setPenColour(evt) {

    m_pen_colour = evt.target.getAttribute('fill');

  }

  ]]>

Reference:
Tutorials - SVG [kevlindev.com]
Tutorials - SVG - Events [kevlindev.com]

Unix Console Styler

kedare (Mathieu Poussin) — Wed, 28 Nov 2007 19:21:49 GMT

This modue can be used to apply many style on Unix* terminals



# Unix Console Style

# You can use this module to apply a style on the terminal

#

# DON'T WORK ON WINDOWS (Only on *nix Terminal)



module UnixConsoleStyler

  class StyleNotFoundException < Exception; end

  

  # Availables Styles

  STYLE = {

      :default    =>    "\033[0m",

    	# styles

    	:bold       =>    "\033[1m",

    	:underline  =>    "\033[4m",

    	:blink      =>    "\033[5m",

    	:reverse    =>    "\033[7m",

    	:concealed  =>    "\033[8m",

    	# font colors

    	:black      =>    "\033[30m", 

    	:red        =>    "\033[31m",

    	:green      =>    "\033[32m",

    	:yellow     =>    "\033[33m",

    	:blue       =>    "\033[34m",

    	:magenta    =>    "\033[35m",

    	:cyan       =>    "\033[36m",

    	:white      =>    "\033[37m",

    	# background colors

    	:on_black   =>    "\033[40m", 

    	:on_red     =>    "\033[41m",

    	:on_green   =>    "\033[42m",

    	:on_yellow  =>    "\033[43m",

    	:on_blue    =>    "\033[44m",

    	:on_magenta =>    "\033[45m",

    	:on_cyan    =>    "\033[46m",

    	:on_white   =>    "\033[47m" }

  

  # Methods to use if you want to apply a style

  def UnixConsoleStyler::apply_style(style)

    if STYLE.has_key? style

      STDOUT.write STYLE[style]

    else

      raise StyleNotFoundException, "Style #{style} not found"

    end

  end

  

end

Gradient in an applet

kedare (Mathieu Poussin) — Wed, 25 Apr 2007 20:54:01 GMT



import java.awt.*;

import java.applet.*;

import javax.swing.*;



public class JavaAppDe extends JApplet {

	

    public void init() {

    }

	

    public void paint (Graphics g) {

        super.paint(g);

	int base = 0;

	while(base<255) {

		g.setColor(new Color(base,base,base));

		g.drawLine(0,base,255,base);

		base++;

	}

    }

}

Linux - command ls without color

whitetiger () — Tue, 19 Dec 2006 22:55:42 GMT

// Elimina tutti i caratteri speciali che portano il colore



ls --color=never

Colorize Function

heavysixer () — Wed, 23 Aug 2006 08:42:03 GMT

/*
I don't use the flash colorize function much so this is an example of how to colorize a movieclip with a supplied hexnumber

colorize(0xff0000,my_movieClip);

//will turn my_movieClip bright red.
*/



function colorize(c:Number,mc:MovieClip){

  var tf:Transform = new Transform(mc);

  var color_tf:ColorTransform = new ColorTransform();

  color_tf.rgb = c;

  tf.colorTransform = color_tf;

};

Color Picker drop-down box helper

lono () — Mon, 22 May 2006 17:56:40 GMT

// description of your code here
This helper will generate a whole bunch o' colors in a drop down box, which which you can do whatever with. Currently I am allowing users to change certain colors of the page.



     def color_picker(name)

       #build the hexes

      hexes = []

       (0..15).step(3) do |one|

         (0..15).step(3) do |two|

           (0..15).step(3) do |three|

            hexes << "#" + one.to_s(16) + two.to_s(16) + three.to_s(16)

           end

         end

       end

       arr = []

       10.times { arr << " " }

         returning html = '' do

        html << ""

      end

     end

Python - change_color_entry

whitetiger () — Sat, 18 Mar 2006 16:10:03 GMT

// Cambia il colore di sfondo di una gtk.Entry, ma il discorso vale anche
// per la gtk.TextView...



import gtk



def change_color_entry(entry, color):

    entry.modify_base(gk.STATE_NORMAL, gtk.gdk.color_parse(color))

Using <font> (font tag) within pys60 Text widget

korakot (Korakot Chaovavanich) — Thu, 02 Mar 2006 11:19:20 GMT

The Text widget allow rich text. However, it's quite
difficult to use. You need to set each attribute
(font, style, highlight, color) of the widget
before adding more text with differert style.

So, I make a function that make it a bit easier.
The font tag () is used (borrowed from HTML).
Attributes allowed are
- color ( #RRGGBB or 0xRRGGBB or color name)
- face ( both font and size eg. albi17b )
- style ( bold, italic, underline or strikethrough )
(styles can be combined using comma)
- highlight ( standard, rounded, shadow)
- hcolor ( highlight color )



from appuifw import *



def process_color(color):

    color_name = {

        'red': 0xff0000, 'green': 0x008000, 'blue':0x0000ff,       

        'black': 0,      'white':0xffffff,      'yellow': 0xffff00

        }

    if color.startswith('#'):   # HTML format #000000

        return int(color[1:], 16)

    if color.startswith('0x'):  # pys60 format 0x000000

        return int(color, 16)

    return color_name[color]



def set_ml(t, s):

    stack = []

    t.clear()

    t.font = 'normal'

    i = 0

    while i < len(s):

        if s.startswith('<', i):  # tag end or tag begin

            j = s.find('>', i) + 1

            if s[i:i+7] == '' or s[i:i+3] == '':

                t.color, t.font, t.style, t.highlight_color = stack.pop()

            else:

                stack.append([t.color, t.font, t.style, t.highlight_color])

                to_style = 0

                for attr_val in s[i:j-1].split(' '):

                    if '=' in attr_val:

                        attr, val = attr_val.split('=')

                        if attr == 'color':

                            t.color = process_color(val)

                        elif attr == 'face':

                            t.font = unicode(val)

                        elif attr == 'hcolor':

                            t.highlight_color = process_color(val)

                        elif attr == 'style':   # style and highlight go together

                            to_style |= eval('|'.join(['STYLE_' + st.upper() for st in val.split(',')]))

                        elif attr == 'highlight':

                            to_style |= eval("HIGHLIGHT_" + val.upper())

                if to_style:

                    t.style = to_style

        else:    # normal text

            j = s.find('<', i)

            if j == -1: j = len(s)

            text = u'' + s[i:j].replace('<', '<')

            t.add(text)

        i = j      # go next chunk

Now you can use it easily



>>> t = app.body   # use the default Text widget that start pys60

>>> set_ml(t, 'Hello World.')

>>>  # a stylish 'Hello World' is displayed

Notice:
- Quotation marks are not used to specify attribute values.
- A shorthand can be used for
- can be nested.