Mobile Digital Signage Bag for iPhone, Now on Sale !!

akio0911's "digital signage bag" for iPhone can be ordered from http://www.sac-favori.com/product/product-03.html !





Geek designs iPhone-powered digital signage bag

SAKETOBA: Japanese redvines

Hi, it is NISHIO Hirokazu, today I'll write about a Japanese traditional food.


Do you know Red Vines or Twizzlers? I know it is a popular candy in US, however it is not popular in Japan. Most of Japanese don't like its liquorice flavor. They say "It smells strange! It is too chewy! What's this lengthy food! Is it food?"


Today I realized SAKETOBA is such in Japan. It is very chewy. And it is made from salmons! I don't feel it smells strange, but I can imagine a lot of foreign people feel it strange. SAKETOBA is a salmon jerky. SAKE means salmon (you may know SAKE means alcoholic drink. The word has different accent.) and TOBA means swarm in Ainu; an ethnic group indigenous to northern part of Japan (Hokkaido). It is nice tidbits to go with drink.

Python Spa #6

Hi, it is NISHIO Hirokazu, today I'm participating Python Onsen(Python Spa) #6. It is a hackathon of python hackers in a inn with hot spa. Pyshon Spa donates reminder of bills. You can see it on donation page of Python Software Foundation. You may remember the post about java-ja spa: Hacker's Cafe Blog: Hackathon with Spa. It is the same inn.


46 bananas!

A lot of pepsi!!

Nice Japanese dinner! Healthy foods!

street computing NOW!!!

Hi, every one. I'm yuiseki.

Today, I will introduce you to "Streetcomputing" -- that is fusion of geek computer culture and urban street culture.

emobile, laptop and netbook allows us to walk round at city with the Web.



http://streetcomputing.yuiseki.net/

Digital Signage Bag for iPhone

Hi, I'm akio. I designed original bag for iPhones.

akio0911's twitter
akio0911's Blog

How to calculate Bezier curves' bounding box

Hi, it is NISHIO Hirokazu. Today I wanted to make a lot of Bezier curves same size. And I got it.

Here is what I want to draw:


To calculate bounding box of cubic Bezier seems easy, especially you know its parametric form. See Bézier curve - Wikipedia, the free encyclopedia

However, there are some pitfall. The derivative of Bezier equation is usually quadratic equation but not always. Solutions of the derivative may out of range, etc.

I publish following source code under MIT License. Feel free to use it.

def calc_box(start, curves):
    P0 = start
    bounds = [[P0[0]], [P0[1]]]

    for c in curves:
        P1, P2, P3 = (
            (c[0], c[1]), 
            (c[2], c[3]), 
            (c[4], c[5]))

        bounds[0].append(P3[0])
        bounds[1].append(P3[1])

        for i in [0, 1]:
            f = lambda t: (
                (1-t)**3 * P0[i] 
                + 3 * (1-t)**2 * t * P1[i] 
                + 3 * (1-t) * t**2 * P2[i]
                + t**3 * P3[i])

            b = 6 * P0[i] - 12 * P1[i] + 6 * P2[i]
            a = -3 * P0[i] + 9 * P1[i] - 9 * P2[i] + 3 * P3[i]
            c = 3 * P1[i] - 3 * P0[i]

            if a == 0:
                if b == 0:
                    continue
                t = -c / b
                if 0 < t < 1: 
                    bounds[i].append(f(t))
                continue

            b2ac = b ** 2 - 4 * c * a
            if b2ac < 0: 
                continue
            t1 = (-b + sqrt(b2ac))/(2 * a)
            if 0 < t1 < 1: bounds[i].append(f(t1))
            t2 = (-b - sqrt(b2ac))/(2 * a)
            if 0 < t2 < 1: bounds[i].append(f(t2))

        P0 = P3

    x = min(bounds[0])
    w = max(bounds[0]) - x
    y = min(bounds[1])
    h = max(bounds[1]) - y
    return (x, y, w, h)

---

Want to know more about me? Please visit http://www.nishiohirokazu.org/

KOIKE STYLE @ WWDC

akio0911 and shao1555

Bag for iPhone

Hi. I'm akio0911.
http://twitter.com/akio0911


I made original bag for iPhone.
I'm in WWDC 2009 with it now.
Find me and watch this cool bag!!

Follow me on twitter for getting information !!

http://twitter.com/bag_for_iphone

KOIKE style pictogram

Hi, It is NISHIO Hirokazu! Do you know 'KOIKE style'? It is a form to use your laptop on streets.


http://www.flickr.com/photos/fumi/3524795697/in/pool-hackerscafe


http://www.flickr.com/photos/akio0911/3604630147/

This morning akio0911 send us the second photo and it inspire me to draw following pictogram.



You know it is an hommage to Julian Opie. The pictogram may show there are some Wifi available. I'll put it on public domain. If you want to use it is free!

Emperor Palpatine

Fractal aurora(Koch curve)

Hi, it is NISHIO Hirokazu. I wondered how we see if there is aurora in Koch curve. So I wrote a python script run on Blender. Let see it(click to enlarge):



The script is as follow. It is not beautifil because I'm just a beginner of Blender. A lot of lines are copy of sample.

from Blender.Mathutils import Vector
from Blender import *
from math import sin, cos, pi

class Turtle(object):
    def __init__(self):
        self.x = 0.0
        self.y = 0.0
        self.dirx = 1.0
        self.diry = 0.0
        self.vert2d_list = [(0.0, 0.0)]
        self.faces = []

    def forward(self, mag):
        self.x += self.dirx * mag 
        self.y += self.diry * mag 
        self.vert2d_list.append((self.x, self.y))

    def rot(self, rad):
        self.dirx, self.diry = (
            self.dirx * cos(rad) - self.diry * sin(rad),
            self.dirx * sin(rad) + self.diry * cos(rad))
    
    def build_mesh(self, z=0.0, name="Mesh"):
        verts3d = [Vector(x, y, z) for (x, y) in self.vert2d_list]
        me = Mesh.New(name + str(z))          # create a new mesh
        me.verts.extend(verts3d)          # add vertices to mesh
        me.faces.extend(self.faces)           # add faces to the mesh (also adds edges)
        return me

def deg(x):
    return 2 * pi / 360 * x

def makeHalo(x):
    mat = Material.New('Halo')          # create a new Material called 'newMat'
    mat.rgbCol = [0.7 * x, 0.7, 0.1]          # change its color
    mat.setAlpha(0.3 * (1 - x))                     # mat.alpha = 0.2 -- almost transparent
    #mat.emit = 0.7                        # equivalent to mat.setEmit(0.8)
    #mat.mode |= Material.Modes.ZTRANSP    # turn on Z-Buffer transparency
    #mat.setAdd(0.8)                       # make it glow
    mat.setMode('Halo')                   # turn 'Halo' "on" and all others "off"
    return mat

def koch(level=1, unit=1):
    if level == 0:
        turtle.forward(unit)
    else:
        koch(level - 1, unit)
        turtle.rot(deg(60))
        koch(level - 1, unit)
        turtle.rot(deg(-120))
        koch(level - 1, unit)
        turtle.rot(deg(60))
        koch(level - 1, unit)
        

turtle = Turtle()
koch(4, 0.6)

for i in range(100):
    ob = Object.New('Mesh', 'myObj')  # link mesh to an object
    m = turtle.build_mesh(i / 5.0)
    m.materials += [makeHalo(i / 100.0)]
    ob.link(m)

    sc = Scene.GetCurrent()          # link object to current scene
    sc.link(ob)