Sunday, May 24, 2015
This time playing with WebGL producing yet another implementation of Conway's Game of Life.
It should work on most browsers and systems including mobile devices.
Wednesday, May 6, 2015
As a warm-up I have ported my favorite xscreensaver, Substrate, to the web.
You can try it out here:
It should work on most browsers and systems including mobile devices.
Tuesday, July 16, 2013
The first installment can be found at: http://robertmuth.blogspot.com/2013/07/android-for-absolute-beginners-1-home.htmlThis part discusses the Android keyboard.
The Android Keyboard
Tapping on a text input field will bring up the keyboard.
Usually, you will type a few characters and then hit the blue enter key (here labeled "Go") to accept the input. This will also make the keyboard disappear.
You can also press the back button. This will make the keyboard disappear without accepting the input, that means the content of text input field will remain as it was before.
Note: In the picture we have turned the device from the usual portrait mode to landscape mode. (You can switch modes by simply tilting the phone.) This will make the keyboard keys bigger at the expense of showing less of the actual app. If the keys are still too small for you, use a stylus to tap on the keys.
The Keyboard in Detail
- marks the place where the next keyboard character will be inserted
- tapping here will clear all the text
- Many apps will start showing suggestion after you type a few characters. Tapping on a suggestions will accept it as input and remove the keyboard from the screen
- erases the last character
- accepts the text entered so far as input and remove the keyboard from the screen
- More Keys
- make other keys visible, e.g. numbers, capital letters, etc.
Different Flavors of Enter Keys
Depending on the circumstances, the keyboard may look slightly different. The picture shows the bottom row of 4 different incarnations of the Android keyboard. The main difference lies with the enter key which varies in color and labeling.
If the enter key is blue, like in first three incarnations, the keyboard will disappear after pressing the enter key. Usually, the corresponding text input field consists of just a single line.
If the text input field has several lines, the keyboard will look like the last incarnation. Pressing the enter key will not make the keyboard disappear but force a line break in the text input field.
Characters with Accents
Dictation: Voice Input
Sunday, July 14, 2013
The initial setup and home screen configuration of the tablet was assumed to be done by an "expert", aka me.
These notes are a reminder for her and whoever might find them useful.
Caveat: Android devices come in a bewildering variety of phones and tablets devices. We focus on Nexus 7 running Android version 4.1 ("Jelly Bean"). So the information might not immediately apply to your device.
The Home Screen
The home screen is where you end up when you turn on the device. The picture above shows the home screen for three different devices: A Galaxy Nexus phone, and Nexus 7 tablet, and a Galaxy s2 phone. The home screen is organized in three different areas:
- a very narrow row at the top with status information
- the big area in the middle that shows the icons and widgets
- A small row at the bottom with several buttons that stay around pretty much all the time
Bottom: Button Row
The home button is the most important one. It will always get you back to the home screen no matter where you are.
The back button is almost as important. It will get you back to the previous screen or remove any other thing that may have popped up on the display. If you press the back button often enough it should get you all the way back to the home screen as well.
Top: Status Row
The notification area on the left may be populated with tiny icons representing bits of information like "a new email has arrived". In the beginning it is ok to ignore those.On the right side are several indicators. The most common are:
- Wifi Signal
- This applies primarily to tablets. If you do not have bars here you will not be able to use many of the features of the phone.
- Phone Signal
- This applies mostly to phones. If you have no bars here, you cannot make phone calls.
- Battery Status
- This gives you an idea of how much battery charge is still available. A white flash-like symbol in the middle of the battery icon indicates that the device is being charged.
- Current time
- Local time your area.
Middle: Icon and Widget Area
The icon and widget area shows icons for some of the apps on the phone. You can start ("launch") an App by tapping on its icon. This will usually lead to the display of a new screen hiding the home screen underneath it. But you can always get back to the home screen by pressing the home button, or the back button.
Widgets are a special kind of app. They allow access to some or all of the functionality of an app without having to launch it first. They typically employ much bigger icons.
Some not so Basic Stuff
Over time is possible that you will accumulate more apps on your device than will fit on the home screen. Two mechanisms exist to deal with this situation: the app browser and additional home screens.
The app browser lets you browse and launch all the apps and widget which are installed on your phone.
Additional home screens can be found to the left and right of the main home screen, organized
in a row of homescreens.
Only one of them visible at a time and you can go to the neighboring ones by swiping left or right.
Remember: pressing the home button will always get you back to the main home screen.
Thursday, February 14, 2013
Starting with Chrome version 25, the Samsung Chromebooks with ARM processors are supporting Native Client. To take advantage of this new platform developers have to update their apps and include an ARM binary. Not many have done that.
To show the potential of the new platform I have added ARM support for my XaoS and Mame apps.
Mame seems to be still a challenge for the machine - performance-wise, but is playable.
To check your chrome version use this URL chrome://help
and, if necessary, switch your Chromebook to the beta or dev channel to get a more recent
version of Chrome.
Sunday, November 18, 2012
The update features two new ROMs (Looping and Super Tank) which were generously
made available by Reinhard Stompe.
All ROMs can be conveniently selected from that start page.
If you are using Chome -- and you should -- you can install MAME from this link:
MAME in the Chrome Webstore
- The port is based on MAME version 0.147u2.
- In order to keep its size reasonable and because of performance concerns many of the more recent CPUs together with the ROMs using them are not supported.
- This still leaves the number of supported ROMs at over 17000.
- Thanks to cleanup in the upstream code base the port was vastly simpler than the original one described here.
- Patches will be posted here shortly.
Saturday, September 1, 2012
Since I am also taking the opportunity to clean up and update the projects, this will
undoubtedly take a while.
The first project to move over is Hocuspocus, a simple webserver for remote controlling
Linux machine, which I run on most of my systems.
The website lives here:
The code can found here: