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Mon, 16 May 2016

Airships

— SjG @ 6:13 pm

The Goodyear Blimp was passing overhead. It’s noisy! Since it was pretty low, I tried to take an iPhone picture. In the shot, I got a serendipitous cameo by one of the local Anna’s Hummingbirds.

Serendipity

Click to see bigger.


Sat, 19 Mar 2016

Kwan Yin Stereogif

— SjG @ 9:08 am

Equinox in the Garden.

KwanYin

Stereo separation’s a little too wide on this experiment. I think it might be time to fabricate a precise positioning rig for my tripod… another project on the list.


Sat, 20 Feb 2016

Anniversary Game

— SjG @ 10:17 pm

So, for our tenth anniversary, I thought I’d make something slightly more … dynamic … than your standard Hallmark card. I thought a simple JavaScript game might be fun.

Since everyone knows that a happy marriage is made of unicorns and rainbows, I figured I’d work with that. My first though was a single-level platform game. I looked at a number of JavaScript game frameworks, and they were all either much too simplistic or much to complicated for what I wanted to do. I spent too much time in the process of starting a game with a new framework, getting frustrated, and then abandoning it. Oh no! I was running out of time!

I decided to bail on frameworks, and just write a quick, simple, pure JavaScript game. I would use animated GIFs as sprites, and do the rest in Canvas. Seems easy.

I raided the usual sources for my assets. I needed a unicorn, so I gave a horn to the Wikipedia running horse animated GIF (which itself is derived from Muybridge’s photos) and knocked out the background. It looked pretty good on a white background!
ur
I then made some animating rainbow hearts, and I was ready.

After the initial stab at coding, unicorns would run back and forth, and rainbows appeared where the user clicked. If the unicorn was within the rainbow ring, I’d register the hit. I was well on my way.

Next, I added the score animations. I was impressed by how smoothly the animation all worked. On a reasonably recent machine, browsers keep up very nicely. Then I went and tested on iOS. Uh-oh. I’d not been very careful about browser size. I ended up recoding the CSS and dimension code to be more or less responsive. OK, seemed good. I added an explosion of hearts effect for when you hit the unicorn. Next, I found a nice source for sounds.

One of the problems I faced was that I was trying to develop the project while sitting on the sofa in the evenings. I’d come home from a long day of coding, and, well, start coding. But then Elizabeth would come home, and I’d have to keep switching windows to avoid creating suspicion. This is where the ability to disable the audio came in. Over the course of a week, I was able to polish it up enough for deployment. It’s far from perfect, but it was well received.

game-1

game-2

Play it yourself, or use the code to create your own game.

Some Lessons Learned:

  • Players will resize the window in the middle of a game. The code should probably trap for that, and do the right thing.
  • I expected players to launch a single rainbow at a time. In fact, there was a whole lot more clicking than that.
  • It might be faster to write a game from scratch, but seriously, take the time to learn a framework and use it. With any luck, it will handle all those weird edge cases, and probably have better support for odd platforms.
  • Sound in JavaScript is nasty, and not very portable. Again, use a framework (or commit to modern browsers, and use Web Audio API).
  • Responsive design is all good, but for a game, it might make sense to commit to a fixed size for playability.
  • Under iOS, things don’t work quite as you’d expect. This game should have been optimized, and used something like the touchAction style to improve playability. Better yet, I should have created a native version with PhoneGap.

Wed, 27 Jan 2016

Onion Texture in Javascript and Canvas

— SjG @ 9:23 pm

When I’m focused on other things and doodling, one of the textures that regularly emerges is a fill pattern of concentric irregular circles.

onions_1
(click to enlarge)

Now, doodling is a way of letting my mind idle. Why I’d want to automate that, I couldn’t say. But for some reason, I did.

So the question was: how do I draw a “sloppy circle,” or one that’s not exactly regular, especially if I want to then draw another similar circle inside of it, and so on.

I settled on the idea of picking a set of points around a circle, with roughly the same radius. If I just drew a line between these points, it would be a regular polygon, and not as gentle as I’d like. So, instead of lines, I needed gentle Bezier curves from point to point.

To get the Bezier control points, I need to create a tangent to the radial line, and put the control points for the curve on that tangent. But how far away from the original point? Better make it a variable!

So, with some playing, I was able to get reasonable values.

You can play with it yourself!

You can easily get results like these:
onions_2

onions_5

onions_3

onions_4
(click to enlarge any of them)

onion_exp_f

Mon, 29 Jun 2015

Failed Javascript Experiment, cont.

— SjG @ 4:38 pm

So I got a few questions about that Javascript experiment, so I thought I’d add some explanation. In the process, I added some features to it.

So what’re all those variables, I was asked. And what do they mean?

To start with, this whole experiment was based on a traditional Islamic tiling pattern. I don’t know the actual origin, but I’m sure it goes way back.

So, step 1, you tile a plane with equilateral triangles. The number of triangles that fit across our page is what I called “Spacing.”

exp-step1

Next, you draw a circle at each intersection of lines. The size of the circle is “Radius” — in this model, a radius of 100% means that the neighboring circles touch.

exp-step2

Last, you divide each circle into twelve equal pieces. Then, according to some predetermined pattern, you connect the points on neighboring circles. Here’s a traditional pattern:

exper-step3

The only other variables of interest are “Column Radius Growth” and “Row Radius Growth” which is the percentage by which the radius of each circle changes depending on the number of the column or row (starting in the upper left-hand corner).

This time around, I’ve added a few different connection patterns.


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