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The Scratch 10-block Programming Challenge

21 March 2014


Back in the 80s and 90s, I used to write programs for Amstrad computer magazines. One of the best features was the 10-liners pages in Amstrad Computer User, which challenged programmers to come up with something interesting, fun or useful in no more than 10 lines of code. In many ways, it was a precursor to the coding competitions that still run today, with a limit on the final file size. You can see one of my contributions here:

magazine cutting showing my program Digital from Amstrad Computer User in February 1991

One of my 10-liners from ACU magazine. If this is your kind of thing, see my Amstrad CPC pages here.

I got around to thinking about what could be done in up to 10 blocks of Scratch. If you haven't heard of it, Scratch is a highly visual educational programming language. I've been using it a lot at my Code Club, and I wrote the book Scratch Programming in Easy Steps.

It's been an interesting challenge: You could pack quite a lot of instructions into one line of Amstrad BASIC (as you can see from the program above), but 10 blocks of Scratch means just ten instructions or functions. The upside is that the core purpose of the demo really shines through. I've used some of my 10-block programs with my Code Club, and they've enjoyed their simplicity, and the ease with which they can experiment with them. Quite simple ideas, like adding a password to a program, or making one sprite control another have really captured their imaginations.

Here are the 10-block demos I've created so far. Click each one to find tips on how they work, and demos that show them in action:

How broadcasts work: click for explanation

How to add a password to your game: click for explanation

How to make a sprite explode: click for explanation

How to draw any regular shape: click for explanation

How to draw a circle: click for explanation

Feel free to share those images and links on your social networks.

I have a few more ideas, so I've set up a page for 10-block Scratch demos which I'll update as I publish new examples. Do you have any ideas for simple examples you'd like to see? Leave a comment below.

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Three things you should know before embedding Getty Images

07 March 2014


Getty Images, one of the world's leading photo libraries, is abandoning watermarking and encouraging bloggers to embed its images in their posts. It's a huge turnaround for a stock library that makes money from licensing its images for use online and in print. In effect, it's a surrender to social media, with the library acknowledging that people were using its images anyway. This strategy will help Getty to build the business from those who are willing to pay for commercial usage, by making the images more traceable to their owners.

The images are fantastic, and take you to people, places and times you couldn't otherwise access. Here's Prince, up close and in concert in the US in September 1984.

Here's Einstein with physicists Paul Ehrenfest (in whose home they're meeting), Paul Langevin, Kamerlingh Onnes, and Pierre Weiss.

Here's the 7th century pyramid and Temple of the Inscriptions in Palenque, Mexico.

And there's plenty more to explore, although not all images are available for embedding.

Before you start using Getty Images on your blog, though, there are three things you need to know:

  1. Getty's terms say photos may not be used "for any commercial purpose (for example, in advertising, promotions or merchandising)". This is a potentially grey area, given that lots of blogs carry advertising and almost every company uses social media to keep in touch with its customers. 
  2. You are only allowed to use the photos by using a special embed code. This is the same technique used to embed Youtube videos today. You don't actually put a copy of the photo or video into your blog, you just put in a code that brings it in from Youtube or Getty when someone looks at your post. That means, however, that Getty controls the embedded photos on your blog, not you. They can remove them at any time, serve alternative content, or even serve ads. Some content management systems might not allow you to embed content in this way. Using embed codes slows down your web page because it adds in another request to a different server. For those who want to optimise the user experience, they're not ideal.
  3. The entire image area is a link back to Getty at the moment. It would be more usual for the credit line to be a link. Having such huge links creates the possibility that people (especially those using touch-based devices) will end up visiting them by mistake, which can be a frustrating user experience.
The collection of images is fantastic, though, and the way the photos are presented looks great. This is an interesting strategy, and it will add some wonderful imagery to the web. As long as you have a strategy to manage the risk of images disappearing, this provides a great free source of high quality editorial photos.

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Books by Sean McManus

Scratch Programming in Easy 

Steps

Scratch Programming in Easy Steps

Raspberry Pi For Dummies

Raspberry Pi For Dummies

Learn to program with the Scratch programming language, widely used in schools and colleges.

Set up your Pi, master Linux, learn Scratch and Python, and create your own electronics projects.

Super Skills: How to 

Code

Super Skills: How to Code

Web Design in Easy Steps

Web Design in Easy Steps

Learn how to code with this great new book, which guides you through 10 easy lessons to build up your coding skills.

Learn the layout, design and navigation techniques that make a great website. Then build your own using HTML, CSS, and JavaScript.

More books

©Sean McManus. www.sean.co.uk.