Here Comes The Sun

Sunng.info in Mosaic

Sunng — Wed, 10 Mar 2010 01:17:37 +0000

Mosaic:
http://en.wikipedia.org/wiki/Mosaic_browser

这么一看，什么标准通通扯淡，还是图片管用，什么浏览器都可以显示。Similar Posts:

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New features in JTS 1.11

Sunng — Wed, 03 Mar 2010 05:16:08 +0000

JTS最近发布了1.11版本，新增了：

对Delaunay三角网、Voronoi多边形的支持；
把Geometry对象转换为AWT的Shape对象的功能
对几何对象进行densify的操作（增加结点）；
计算Hausdorff相似度和Area相似度的支持

计算Delaunay三角网和Voronoi多边形：

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import java.util.ArrayList;
import java.util.Collection;

import com.vividsolutions.jts.geom.Coordinate;
import com.vividsolutions.jts.geom.Geometry;
import com.vividsolutions.jts.geom.GeometryCollection;
import com.vividsolutions.jts.geom.GeometryFactory;
import com.vividsolutions.jts.triangulate.DelaunayTriangulationBuilder;
import com.vividsolutions.jts.triangulate.VoronoiDiagramBuilder;

/**
*
* @author Sun Ning/SNDA
* @since 2010-3-3
*/
public class DelaunayAndVoronoiApp {

/**
* create some predefined sites
* @return
*/
public static Collection<Coordinate> getPredefinedSites(){
double[][] coords = {{100,27},{28, 50},{29, 40},{32, 90}, {12, 26}};
ArrayList<Coordinate> coordinates = new ArrayList<Coordinate>(coords.length);

for(int i=0; i<coords.length; i++){
coordinates.add(new Coordinate(coords[i][0], coords[i][1]));
}

return coordinates;
}

/**
*
* @param coords
* @return a geometry collection of triangulations
*/
public static Geometry buildDelaunayTriangulation(Collection<Coordinate> coords){
DelaunayTriangulationBuilder builder = new DelaunayTriangulationBuilder();
builder.setSites(coords);
return builder.getTriangles(new GeometryFactory());
}
/**
*
* @param coords
* @return a collection of polygons
*/
public static Geometry buildVoronoiDiagram(Collection<Coordinate> coords){
VoronoiDiagramBuilder builder = new VoronoiDiagramBuilder();
builder.setSites(coords);
return builder.getDiagram(new GeometryFactory());
}

/**
*
* @param args
*/
public static void main(String[] args){
Collection<Coordinate> coordinates = getPredefinedSites();

/**
* Delauny
*/
GeometryCollection triangulations
= (GeometryCollection)buildDelaunayTriangulation(coordinates);

int total = triangulations.getNumGeometries();
System.out.printf("Total triangulations: %d\n", total);
for(int i=0; i<total; i++){
Geometry g = triangulations.getGeometryN(i);
Coordinate[] coords = g.getCoordinates();
System.out.printf("Triangulation %d: ", i);
for(Coordinate c : coords){
System.out.printf("(%.3f, %.3f) ", c.x, c.y);
}
System.out.println();
}

/**
* Voronoi
*/
GeometryCollection diagram = (GeometryCollection)
buildVoronoiDiagram(coordinates);
int totalDia = diagram.getNumGeometries();
for(int i=0; i<totalDia; i++){
Geometry g = diagram.getGeometryN(i);
Coordinate[] coords = g.getCoordinates();
System.out.printf("Diagram %d: ", i);
for(Coordinate c : coords){
System.out.printf("(%.3f, %.3f) ", c.x, c.y);
}
System.out.println();
}
}

}

输出：

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Total triangulations: 5
Triangulation 0: (32.000, 90.000) (12.000, 26.000) (28.000, 50.000) (32.000, 90.000)
Triangulation 1: (32.000, 90.000) (28.000, 50.000) (100.000, 27.000) (32.000, 90.000)
Triangulation 2: (100.000, 27.000) (28.000, 50.000) (29.000, 40.000) (100.000, 27.000)
Triangulation 3: (100.000, 27.000) (29.000, 40.000) (12.000, 26.000) (100.000, 27.000)
Triangulation 4: (12.000, 26.000) (29.000, 40.000) (28.000, 50.000) (12.000, 26.000)
Diagram 0: (-76.000, 88.625) (-76.000, 178.000) (176.713, 178.000) (72.699, 65.730) (-38.235, 76.824) (-76.000, 88.625)
Diagram 1: (-76.000, -62.000) (-76.000, 88.625) (-38.235, 76.824) (11.978, 43.348) (56.422, -10.619) (57.006, -62.000) (-76.000, -62.000)
Diagram 2: (11.978, 43.348) (-38.235, 76.824) (72.699, 65.730) (67.316, 48.882) (11.978, 43.348)
Diagram 3: (176.713, 178.000) (188.000, 178.000) (188.000, -62.000) (57.006, -62.000) (56.422, -10.619) (67.316, 48.882) (72.699, 65.730) (176.713, 178.000)
Diagram 4: (11.978, 43.348) (67.316, 48.882) (56.422, -10.619) (11.978, 43.348)

将Geometry对象转换成Shape对象，绘制在JPanel上：

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import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Shape;
import java.util.Collection;
import javax.swing.JFrame;
import javax.swing.JPanel;

import com.vividsolutions.jts.awt.ShapeWriter;
import com.vividsolutions.jts.geom.Coordinate;
import com.vividsolutions.jts.geom.Geometry;
import java.util.Random;

/**
*
* @author Sun Ning/SNDA
* @since 2010-3-3
*/
public class JTS2Awt {

public static void showUI(final Shape... shape){
JFrame jframe = new JFrame("JTS Geometry to AWT Shape");

JPanel jp = new JPanel(){
@Override
public void paint(Graphics g){
super.paint(g);
Graphics2D g2d = (Graphics2D)g;
if(shape != null){
for(Shape s: shape){
g2d.setColor(new Color(Color.HSBtoRGB(new Random().nextFloat(), 1f, 0.6f)));
g2d.draw(s);
}
}
}
};
jp.setPreferredSize(new Dimension(150, 150));

jframe.getContentPane().add(jp);
jframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
jframe.pack();
jframe.setVisible(true);
}

public static Shape toShape(Geometry geom){
ShapeWriter writer = new ShapeWriter();
return writer.toShape(geom);
}

public static void main(String[] args){
Collection<Coordinate> coords = DelaunayAndVoronoiApp.getPredefinedSites();
Geometry geomT = DelaunayAndVoronoiApp.buildDelaunayTriangulation(coords);
Geometry geomD = DelaunayAndVoronoiApp.buildVoronoiDiagram(coords);

showUI(toShape(geomT), toShape(geomD));
}

}

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封闭开发

Sunng — Tue, 02 Mar 2010 15:04:50 +0000

从后天起，我就要被封闭开发了。地点在公司对面的酒店里，问具体的情况据老大说，是要去一个“有人给你做饭，有人给你洗衣服”的地方，说得跟人间天堂似的。去年刚到公司实习的时候就赶上有组封闭开发，印象中好像封了有一个多月。老实说封闭开发也是没办法的事情，我们这个菜场式的办公环境，一个人手上又有多个项目，不断地有人来找你问各种各样的事情，就算不问你，问你旁边的人，声音大到耳机挡不住，这种环境下怎么可能开发出有质量的产品。参考一下敏捷团队空间注意事项，那想想，封就封了吧。

这次项目到四月中旬截止，还不太清楚会是什么情况，能不能上网，每天要干多长时间，具体情况等我从小黑屋发来现场报道吧。Similar Posts:

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Get your conky location aware

Sunng — Fri, 19 Feb 2010 15:17:26 +0000

Add this in your conkyrc

1	${exec curl -s "http://api.hostip.info" \| xpath -e "//gml:featureMember/Hostip/gml:name/text()" -q} ${exec curl -s "http://api.hostip.info" \| xpath -e "//gml:featureMember/Hostip//gml:coordinates/text()" -q}

Hostip is well known as a service provider of the geoclue framework. It translates IP address to geolocation information. The API we use will return a GML document like

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version="1.0" encoding="ISO-8859-1" ?>
version="1.0.1" xmlns:gml="http://www.opengis.net/gml" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="http://www.hostip.info/api/hostip-1.0.1.xsd">
>This is the Hostip Lookup Service>
>hostip>
>
>inapplicable>
>
>
>
>58.212.88.212>
>Nanjing>
>CHINA>
>CN>

>
>
srsName="http://www.opengis.net/gml/srs/epsg.xml#4326">
>118.883,32.05>
>
>
>
>
>
>

Because it uses ip to lookup your address, you cannot expect higher resolution and precision currently. Similar Posts:

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Using weather

Sunng — Thu, 18 Feb 2010 13:43:23 +0000

Ubuntu仓库里有个weather-util包，可以用来查看天气信息。weather工具从weather.noaa.gov网站获得天气信息，对美国的城市可以直接用名字查询，其他国家只能使用id查询。id的规则和weather.com不太相同。

中国的天气站点id可以在这个页面上查到。比如南京ZSNJ，上海浦东ZSPD。使用weather工具查询：
weather -i ZSNJ

Current conditions at China (ZSNJ) 32-00N 118-48E 12M (ZSNJ)
Last updated Feb 18, 2010 – 08:00 AM EST / 2010.02.18 1300 UTC
Temperature: 35 F (2 C)
Relative Humidity: 59%
Wind: from the SSW (210 degrees) at 4 MPH (4 KT)

简化操作，可以在$HOME下创建.weatherrc文件，形如

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[default]
ID = ZSPD
[nj]
ID = ZSNJ

就可以直接使用
weather

Current conditions at China (ZSPD) 31-07N 121-46E (ZSPD)
Last updated Feb 18, 2010 – 08:00 AM EST / 2010.02.18 1300 UTC
Temperature: 35 F (2 C)
Relative Humidity: 47%
Wind: from the NE (050 degrees) at 7 MPH (6 KT) (direction variable)

和
weather nj

Current conditions at China (ZSNJ) 32-00N 118-48E 12M (ZSNJ)
Last updated Feb 18, 2010 – 08:00 AM EST / 2010.02.18 1300 UTC
Temperature: 35 F (2 C)
Relative Humidity: 59%
Wind: from the SSW (210 degrees) at 4 MPH (4 KT)

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I ♥ Free and Open Source Software

Sunng — Sun, 14 Feb 2010 13:43:22 +0000

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老物什 / Old Stuff

Sunng — Sun, 14 Feb 2010 09:12:02 +0000

大年初一翻旧物，找到一些让人颇有感触的旧物件。2004年买的RH9，2005年夏天买的Fedora 4。前者至今还安装在我家最旧的电脑里，虽然我都忘了它的样子了。

包装

手册

CDs

这个代理商里仁软件似乎已经倒闭了。Similar Posts:

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Virtual Machine Searcher for Gnome Deskbar Applet

Sunng — Fri, 12 Feb 2010 08:18:33 +0000

Very glad to announce another daily-coding work: an extension for gnome deskbar applet to search and launch virtual machine. There is a plugin for gnome-do that does the same job. That’s what I create the the plugin for. I switched to deskbar because gnome-do’s Do.exe reminds me nightmares when I was a M$ Windows user. The deskbar applet has been a great replacement, however, the virtualbox plugin in Do is really impressive while deskbar doesn’t provide me the same functionality.

You can ignore words above and just take a look at the screenshot:

Download

Download the extension from (the highlighted one):
http://bitbucket.org/sunng/daily-coding/downloads/?highlight=5137

You can also trace the development at bitbucket project. However, the repository is mixed with other small code snippets. Currently, mercurial doesn’t support subdirectory pull. So there is no way to grab the deskbar-applet individually.

Installation

copy this file to /usr/lib/deskbar-applet/deskbar-applet/modules-2.20-compatible/ (Ubuntu installation for example) with super user privilege. Right click desktbar applet, select Preference, Searchers tab, hit “Reload” button, then check the Virtualbox Deskbar Module.

Issue

Feel free the report issues on bitbucket:
http://bitbucket.org/sunng/daily-coding/issues/Similar Posts:

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List your installed virtualbox virtual marchines using vbox python xpcom api

Sunng — Fri, 12 Feb 2010 05:33:51 +0000

I’m sorry for the long title. Due to lack of documentation, it’s not easy to use python xpcom api from virtualbox sdk. The code below is just a sample that lists your installed virtual machines. It works on linux with VirtualBox OSE 2.0.8. Hope useful to you.

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import vboxapi
vmsg = vboxapi.VirtualBoxManager(None, None)
vbox = vmsg.vbox
vmsg.mgr.getSessionObject(vbox)
machs = vbox.getMachines()
names = map(lambda x: (x.name,x.id), machs)
print names

Output:

[(u'Ubuntu', u'aac3fd46-4f1e-4f6e-8abe-b1a5516abf8c'), (u'Windows', u'fa73952e-f0a6-4bf0-af20-259513d73bc1'), (u'OpenSolaris', u'a951542c-3178-4a6b-8087-f1b0314e283a'), (u'LinuxMint', u'8191f256-1b76-4ce7-a202-93730dae1b33'), (u'Fedora', u'ca250f45-d752-4baf-9281-fb0847dc8287'), (u'Freebsd', u'8322b62a-aed5-4f04-9815-9fadfeba9fe1'), (u'ArchLinux', u'efc1167a-4e06-4c14-aeb0-bfb303c8f5f7'), (u'openSUSE', u'02e18816-311d-420b-99b3-6b4b4cccf7b7'), (u'CentOS', u'ccf0421c-85c4-4123-8722-57abc494c633')]

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Sunng’s Canvas based Heatmap API

Sunng — Thu, 11 Feb 2010 07:10:03 +0000

Glad to announce my works this morning: A simple heatmap API based on HTML5 canvas.

The programming interface is rather simple now. To create such a heatmap, you just new a heatmap object by:

heatmap = new HeatMap("canv");

Then read your dataset and push data into the heatmap:

heatmap.push(x, y, value);

At last, spread the data and get the canvas rendered:

heatmap.spread();
heatmap.render();

Now you got it.

For advanced usage, you can specify the resolution of heatmap by px:

heatmap = new HeatMap("canv", 2);

Large value will gain performance with low image quality.

Also, you can specify a value to define the attenuation value of each px.

heatmap.spread(5);

Finally, there is an option to use your own color schema for heatmap generation.

heatmap.render(function(value, maxValue){
    var light = value / maxValue * 100;
    return "hsl(20, 75%, "+light+"%)";
});

The parameters passed in are current pixel value and max value in whole context.

That’s all the toolkit. More functionality and options might be added in future. Grab it from my bitbucket page:
http://bitbucket.org/sunng/daily-coding/src/tip/canvas-heatmap/

There is a demo page which you can test the api by clicking canvas:

then click heatmap button!

This is the new year gift for my readers and my dear friends !Similar Posts:

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