Mobile-Web-App

Thursday, September 6, 2012

QEMU version 1.2.0 is out

QEMU is a generic and open source machine emulator and virtualizer.

When used as a machine emulator, QEMU can run OSes and programs made for one machine (e.g. an ARM board) on a different machine (e.g. your own PC). By using dynamic translation, it achieves very good performance.

When used as a virtualizer, QEMU achieves near native performances by executing the guest code directly on the host CPU. QEMU supports virtualization when executing under the Xen hypervisor or using the KVM kernel module in Linux. When using KVM, QEMU can virtualize x86, server and embedded PowerPC, and S390 guests.

QEMU version 1.2.0 is out. See the Download page for more information.

Wednesday, September 5, 2012

Open webOS 1.0 Beta released

The Beta of Open webOS 1.0 has been released. The Beta includes two build systems, aimed at enabling developers in two ways:

Our OpenEmbedded-based Build System
OpenEmbedded is specially targeted at managing porting to multiple platform architectures, and is an ideal base for contributors interested in bringing Open webOS to new hardware. The Beta release opens our ongoing development branch targeting an ARM emulator.
Our Linux Desktop Build
Develop on your own desktop, where you have access to all of your own tools and code. This is the ideal, productive environment for OS developers to enhance the user experience and integrate other best-of-breed open source technologies. The desktop build supports running System Manager as an application on your desktop, and the Core Applications running within System Manager.

http://www.openwebosproject.org/

golangide: IDE for GO Language

LiteIDE is a simple, open source, cross-platform IDE. golangide is a LiteIDE Released for Go.

Base Features:

Mime type basis system
System environment manage
Build system manage
Debug system simple and open
Kate syntax and style scheme
WordApi complete helper

Golang Support:

GOPATH Project
Go Playground
Golang ast view
Godoc browser
Gocode helper
Project wizard
Project build
Source build

System

Windows
Linux
MacOSX

Tuesday, September 4, 2012

Free eBook download: An Introduction to Programming in Go

The book An Introduction to Programming in Go is available for purchase at Amazon.com. It is also available for free online.

This book is a short, concise introduction to computer programming using the language Go. Designed by Google, Go is a general purpose programming language with modern features, clean syntax and a robust well-documented common library, making it an ideal language to learn as your first programming language.

Monday, September 3, 2012

HTML5 and Javascript example; detect Touch event and free-draw on canvas for mobile device.

Last example "HTML5 and Javascript example; detect mouse event and free-draw on canvas" demonstrate how to detect mouse event for desktop browser with mouse input. But it cannot work on mobile device with touch input!

In order to detect touch event on mobile device, we have to implement EventListener of touchstart, touchend and touchmove. To retrieve the X, Y position of the touch events, read via event.touches[0].pageX and event.touches[0].pageY.

Example:

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Mobile-Web-App: HTML5 Canvas</title>
<script type="text/javascript" src="http://code.jquery.com/jquery-1.8.0.min.js"></script>
<script type="text/javascript">

var canvas;
var context; 
var mouseon;
var touchon;

$(window).bind("resize", resetCanvas);

function loadcanvas(){
 window.scrollTo(0, 1);
 resetCanvas();
 
 mouseon = false;
 
 document.body.addEventListener(
  "mousedown",
  function(event){
   context.moveTo(event.pageX, event.pageY);
   mouseon = true;
  },
  false
 ); 

 document.body.addEventListener(
  "mouseup",
  function(event){
   mouseon = false;
  },
  false
 );
 
 document.body.addEventListener(
  "mousemove",
  function(event){
   if(mouseon){
    context.lineTo(event.pageX, event.pageY);
    context.stroke();
   }
  },
  false
 );
 
 document.body.addEventListener(
  "touchstart",
  function(event){
   context.beginPath();
   context.moveTo(event.touches[0].pageX, event.touches[0].pageY);
   touchon = true;
   context.preventDefault();
   
   
  },
  false
 ); 

 document.body.addEventListener(
  "touchend",
  function(event){
   touchon = false;
  },
  false
 );
 
 document.body.addEventListener(
  "touchmove",
  function(event){
   if(touchon){
    context.lineTo(event.touches[0].pageX, event.touches[0].pageY);
    context.stroke();
   }
  },
  false
 );

}

function drawBackground(){

 context.fillStyle = "#505050";
 context.fillRect(0, 0, canvas.width, canvas.height);
 
}

function resetCanvas(){
 canvas = document.getElementById("mycanvas");

 canvas.width = window.innerWidth;
 canvas.height = window.innerHeight; 
 
 context = canvas.getContext("2d");
 
 drawBackground();
}

</script>
</head>
<body onload="loadcanvas();">

<canvas id="mycanvas">
Sorry! Your browser doesn't support Canvas.
</canvas>
</body>
</html>

Please notice that it doesn't work on all mobile browsers currently. Here is the result of running on various browsers at Android device (HTC One X).

Run on Firefox Mobile, it work as expected and have the best result.

Run on Opera Mobile, work but slow response.

Run on Chrome, NOT work! Only part of the touch path drawn.

Sunday, September 2, 2012

HTML5 and Javascript example; detect mouse event and free-draw on canvas.

Example to detect mouse event and free-draw on HTML5 canvas, using Javascript.

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Mobile-Web-App: HTML5 Canvas</title>
<script type="text/javascript" src="http://code.jquery.com/jquery-1.8.0.min.js"></script>
<script type="text/javascript">

var canvas;
var context; 
var mouseon;

$(window).bind("resize", resetCanvas);

function loadcanvas(){
 window.scrollTo(0, 1);
 resetCanvas();
 
 mouseon = false;
 
 document.body.addEventListener(
  "mousedown",
  function(event){
   context.moveTo(event.pageX, event.pageY);
   mouseon = true;
  },
  false
 ); 

 document.body.addEventListener(
  "mouseup",
  function(event){
   mouseon = false;
  },
  false
 );
 
 document.body.addEventListener(
  "mousemove",
  function(event){
   if(mouseon){
    context.lineTo(event.pageX, event.pageY);
    context.stroke();
   }
  },
  false
 );

}

function drawBackground(){

 context.fillStyle = "#505050";
 context.fillRect(0, 0, canvas.width, canvas.height);
 
}

function resetCanvas(){
 canvas = document.getElementById("mycanvas");

 canvas.width = window.innerWidth;
 canvas.height = window.innerHeight; 
 
 context = canvas.getContext("2d");
 
 drawBackground();
}

</script>
</head>
<body onload="loadcanvas();">

<canvas id="mycanvas">
Sorry! Your browser doesn't support Canvas.
</canvas>
</body>
</html>

Saturday, September 1, 2012

New options for the Maps Ad Unit

Google have provided ways to add AdSense to Google Maps via the Maps Ad Unit, to monetize sites that use the Google Maps API. And now, Google are adding two new extensions to that feature. This means more choices for ads with your maps and an improved experience for your users.

Know more: Google Geo Developers Blog