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apt install build-essential cmake \
libsdl2-2.0-0 libsdl2-dev libsdl2-image-dev libsdl2-mixer-dev
dnf install g++ make cmake \
SDL2 SDL2-devel \
SDL2_image SDL2_image-devel \
SDL2_mixer SDL2_mixer-devel
brew install cmake SDL2 SDL2_
Community Discussions
Trending Discussions on ia
QUESTION
I am using a 3.5: TFT LCD display with an Arduino Uno and the library from the manufacturer, the KeDei TFT library. The library came with a bitmap font table that is huge for the small amount of memory of an Arduino Uno so I've been looking for alternatives.
What I am running into is that there doesn't seem to be a standard representation and some of the bitmap font tables I've found work fine and others display as strange doodles and marks or they display upside down or they display with letters flipped. After writing a simple application to display some of the characters, I finally realized that different bitmaps use different character orientations.
My questionWhat are the rules or standards or expected representations for the bit data for bitmap fonts? Why do there seem to be several different text character orientations used with bitmap fonts?
Thoughts about the questionAre these due to different target devices such as a Windows display driver or a Linux display driver versus a bare metal Arduino TFT LCD display driver?
What is the criteria used to determine a particular bitmap font representation as a series of unsigned char values? Are different types of raster devices such as a TFT LCD display and its controller have a different sequence of bits when drawing on the display surface by setting pixel colors?
What other possible bitmap font representations requiring a transformation which my version of the library currently doesn't offer, are there?
Is there some method other than the approach I'm using to determine what transformation is needed? I currently plug the bitmap font table into a test program and print out a set of characters to see how it looks and then fine tune the transformation by testing with the Arduino and the TFT LCD screen.
My experience thus farThe KeDei TFT library came with an a bitmap font table that was defined as
...ANSWER
Answered 2021-Jun-12 at 16:19Raster or bitmap fonts are represented in a number of different ways and there are bitmap font file standards that have been developed for both Linux and Windows. However raw data representation of bitmap fonts in programming language source code seems to vary depending on:
- the memory architecture of the target computer,
- the architecture and communication pathways to the display controller,
- character glyph height and width in pixels and
- the amount of memory for bitmap storage and what measures are taken to make that as small as possible.
A brief overview of bitmap fonts
A generic bitmap is a block of data in which individual bits are used to indicate a state of either on or off. One use of a bitmap is to store image data. Character glyphs can be created and stored as a collection of images, one for each character in the character set, so using a bitmap to encode and store each character image is a natural fit.
Bitmap fonts are bitmaps used to indicate how to display or print characters by turning on or off pixels or printing or not printing dots on a page. See Wikipedia Bitmap fonts
A bitmap font is one that stores each glyph as an array of pixels (that is, a bitmap). It is less commonly known as a raster font or a pixel font. Bitmap fonts are simply collections of raster images of glyphs. For each variant of the font, there is a complete set of glyph images, with each set containing an image for each character. For example, if a font has three sizes, and any combination of bold and italic, then there must be 12 complete sets of images.
A brief history of using bitmap fonts
The earliest user interface terminals such as teletype terminals used dot matrix printer mechanisms to print on rolls of paper. With the development of Cathode Ray Tube terminals bitmap fonts were readily transferable to that technology as dots of luminescence turned on and off by a scanning electron gun.
Earliest bitmap fonts were of a fixed height and width with the bitmap acting as a kind of stamp or pattern to print characters on the output medium, paper or display tube, with a fixed line height and a fixed line width such as the 80 columns and 24 lines of the DEC VT-100 terminal.
With increasing processing power, a more sophisticated typographical approach became available with vector fonts used to improve displayed text quality and provide improved scaling while also reducing memory required to describe the character glyphs.
In addition, while a matrix of dots or pixels worked fairly well for languages such as English, written languages with complex glyph forms were poorly served by bitmap fonts.
Representation of bitmap fonts in source code
There are a number of bitmap font file formats which provide a way to represent a bitmap font in a device independent description. For an example see Wikipedia topic - Glyph Bitmap Distribution Format
The Glyph Bitmap Distribution Format (BDF) by Adobe is a file format for storing bitmap fonts. The content takes the form of a text file intended to be human- and computer-readable. BDF is typically used in Unix X Window environments. It has largely been replaced by the PCF font format which is somewhat more efficient, and by scalable fonts such as OpenType and TrueType fonts.
Other bitmap standards such as XBM, Wikipedia topic - X BitMap, or XPM, Wikipedia topic - X PixMap, are source code components that describe bitmaps however many of these are not meant for bitmap fonts specifically but rather other graphical images such as icons, cursors, etc.
As bitmap fonts are an older format many times bitmap fonts are wrapped within another font standard such as TrueType in order to be compatible with the standard font subsystems of modern operating systems such as Linux and Windows.
However embedded systems that are running on the bare metal or using an RTOS will normally need the raw bitmap character image data in the form similar to the XBM format. See Encyclopedia of Graphics File Formats which has this example:
Following is an example of a 16x16 bitmap stored using both its X10 and X11 variations. Note that each array contains exactly the same data, but is stored using different data word types:
QUESTION
ANSWER
Answered 2021-Jun-07 at 13:42The expected JSON result from your question is not the same as the JSON from the API!
You can use states.items.filter
instead of states.filter
but the API linked has no property abbr
so it will return undefined:
QUESTION
When i upload a file lets says as standard IA, it is successfully uploaded and when i try to change to store class it shows a summary of all storage class which has column minimum storage time (30 days)?
Does that mean that the object which is just uploaded should be stored for 30 days then only we can change its storage class? if yes then why i am able to change its storage class instantly?
Even on Docs there is no mention
...ANSWER
Answered 2021-Jun-03 at 15:17From Amazon Docs:
Note: The S3 Standard-IA and S3 One Zone-IA storage classes are suitable for objects larger than 128 KB that you plan to store for at least 30 days. If an object is less than 128 KB, Amazon S3 charges you for 128 KB. If you delete an object before the end of the 30-day minimum storage duration period, you are charged for 30 days.
If you delete it or change its storage class before 30 days, you will be charged for 30 days.
QUESTION
I'm having trouble with installing Tableau Desktop with native installer arguments with Chocolatey. Basically, I know that Tableau Desktop .exe installer can take multiple arguments such as:
- ACTIVATE_KEY=""
- REGISTER=1 (if we want Tableau Desktop to register itself during installation)
So, i tried installing Tableau Desktop 2020.1.3 with this command:
...ANSWER
Answered 2021-Jun-02 at 22:56Okay, so..., I got it working. Basically what happened was, I thought:
We always need a forward slash before speciying the install arguments to chocolatey like so:
choco install --install-arguments='/argument1=""someValue"" argument2=""anotherValue""'
Turns out that this is not true. We don't need to specify any forward slash "/" before "argument1" in the PowerShell command above.
I also believed that we need to use a pair of double quotes ("") before and after we specify the value to an argument that we pass to the native installer like this:
--install-arguments='/argument1=""someValue"" argument2=""anotherValue""'
Turns out this is also incorrect. We don't have to use double quotes ("") before and after we specify a value for each argument. We just have to do it normally like how the native installer expects arguments to be passed to it.
With this knowledge, I rewrote the Tableau Desktop installation PowerShell command to:
QUESTION
I'm sure this is a simple solution so thank you in advance I just can't seem to find the correct solution for this.
I have a job board, currently I am working on the filtering system using ajax, jquery, and php. I have it set up so that when I click on a checkbox or multiple checkboxes it sends me the data, but currently it is sending me the data of multiple check boxes like so: 12,34. I am trying to separate these out using a foreach loop so that I can use these values independently for an sql statement, but as of right now it doesn't print anything.
This is my simple filter page:
...ANSWER
Answered 2021-Jun-02 at 20:38Why not just ship the data off to your PHP as arrays? Dont do this:
QUESTION
My issue here is that my Xmobar says that it's "Updating..." when I provide the layout with a path to a C script (the executable)that I hacked together. I included Run Stdinreader and that made no dent on the issue.
I was under the impression that if a script can output to the terminal, it could to Xmobar. This C script is responsible for printing a quote to the terminal based on conditions specified. I don't need help with the script itself (although it is rushed and could be better constructed). I just want to know:
Is this an issue with an incompatibility with Xmobar and C? Or, did I forget to do something that will make the taskbar spit out the correct output?
My Xmobar Config is:
...ANSWER
Answered 2021-Jan-27 at 23:23Did more research today. The problem here is that %% counts as an argument to "run" something, but above it is where it's supposed to be defined. It's not.
I just used %diskspace% for a new script that outputs my Sink volume. It would work the same with the C script.
QUESTION
How can I get the ip address of users who connect to my site located on my server using apache? I only get the ip address of my server.
...ANSWER
Answered 2021-Jun-02 at 13:42You could try:
QUESTION
Question - I need my app to force HTTPS connection (443) but if a connection request comes in on 80, to take it and accept it, though on my below code I am getting
IApplicationBuilder does not contain a definition for UseHttpRedirection" and no accessible extension method 'UseHttpRedirection' accepting first argument of type IA ApplicationBuilder could be found, and error HttpRequest does not contain a definition for port.
What am I doing wrong?
...ANSWER
Answered 2021-Jun-01 at 20:45Well, there is no method UseHttpRedirection
. The only provided redirect is from http to https
What am I doing wrong?
You can include the https redirect, that's fine. If you bind the server to port 80, that could also work with https. If you find that the middleware does not suit your use case, look into it and copy it: https://github.com/dotnet/aspnetcore/blob/main/src/Middleware/HttpsPolicy/src/HttpsRedirectionMiddleware.cs
QUESTION
I'm learning how to use PDDL for a IA class and I have to code a plan where I need to pick a person up from location4 and drop it in location1, also pick a person in location3 and drop it in location1 also. I already have the code which move to location pick the person, move to destiny location and drop it. but there are some rules that I can't put on code, there is a connection path that I need to follow and I do not know how to put that conditions:
This is the connection path: Loction1 -> Location2 -> Location4 -> Location3
I have the code to go from one location to other but I do not know how to put a condition in where it can't go from Location 1 to Location 4 directly
Here is the code:
Domain:
(define (domain planeacion_Str)
...ANSWER
Answered 2021-Jun-01 at 17:12You need to add a precondition to your movement action that you can only move between adjacent locations; and you then add a list of adjacent locations as predicates in your initial state:
(adjacent location1 location2)
(adjacent location2 location3)
but not (adjacent location1 location4)
.
QUESTION
DISCLAIMER : I am French and so I am sorry in advance for my poor english. Please be nice, thank you very much.
So I have multiple files and graphs with different direction (rankdir
). I must merge them to have one big coherent graph.
There is a part on the bottom with the classic toptobottom
direction :
ANSWER
Answered 2021-Jun-01 at 16:04try:
-array to combine as graphs (not clusters or nodes)
_i to combine the files in the order on the command line (not based on size)
3 to request 3 "columns" of graphs (not a 2x2 grid)
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