We've covered almost everything we need to create QR Codes. The next thing we need is version information blocks. The version information blocks simply tell the reader what version the symbol is, and therefore how many modules wide and tall it is. Table 11 shows the...
Now that we've got the data and error correction sorted out, we're almost ready to place it in the symbol. As seen in Part 2, the data and error correction modules basically go everywhere that isn't taken up by something else. The reason we're not quite ready to place...
I had planned on holding off the error correction until later, but it really fits better right here. Before error correction is done, the data that we've generated must be broken down into "code words", which are just 8-bit bytes. All we have to do is take our "bit...
Now we'll cover how the data is encoded. There are several steps involved. First, the encoding method is chosen, then the raw data is converted to binary based on the encoding method, then the error correction algorithm is applied, and then the data is placed in the...
The next important thing we'll look at is the structure of a QR code. The below diagram shows names of the different sections of a QR symbol. Then I'll go over each one in more detail. Keep in mind that below if I mention one copy of something being the original and...
Recently I undertook a task to develop a QR Code generator. I was surprised to find how difficult it was to find complete information on the QR Code specification. Most of what I found only explained part of the puzzle. So my new endeavor is to completely explain the...
Matcha Design - Tuesday, May 17, 2011 The purpose of these tricks is to take existing, perfectly valid code, and add little touches to it. They all use jQuery, though could potentially be adapted. They're meant to be called after the DOM has loaded, such as...
Matcha Design - Tuesday, April 26, 2011 Yesterday, Facebook announced that they've added a new social gadget to their growing arsenal - the Send button. Clicking the Send button on a web page will open a dialog allowing the user to choose from their Facebook friends,...
A couple weeks ago I detailed some things that can keep your website from living up to its potential. In part 2, I focus heavily on user interaction, highlighting some common problems that are usually a result of focusing priority on the wrong goals (i.e. anything...
Every developer needs some reference now and then. Whether you're dealing with a new problem you've never encountered before, learning a new scripting language, or you just can't remember which function you need, these web sites will help you get the job done. 1....
Before you can break into the realm of having a great website, you have to make sure you have one that isn't annoying. Even a great design can be ruined by a simple blunder influenced by over enthusiasm. Here are a few things you'll want to avoid when designing and...
As promised, this week I'm continuing my list of common mistakes, but moving from HTML to the realm of CSS. The rules are a little different with CSS, as you'll see, but I'm still not going to tell you that you shouldn't use perfectly valid practices just because of...