Moving ahead, or at least "around"

Some good progress tonight on Implosion.

I have made a "Selector" class which will host the Tetris-like shape.  It is based on the VisualObject class, and consequently has very little code of its own. I was able to link it to the shape in sio2, so I can clone the shape and it renders.

Next I played around a little with the event handlers in the template.mm file that comes with sio2. After not too much trouble, I was able to get the chip to move around, following the "finger." It doesn't matter whether the finger touches the chip - it still tracks it. (Moving right with the finger by 1 cm moves the selector to the right by 1 cm.) So that's pretty cool.

I've also pulled the camera back about 40%, so everything is a little smaller. This will let me fit a 10x10 grid of chips on the screen.

Coming up next:

• Two-finger twisting of the selector. I suspect that this will be more of a challenge. I'm trying to decide between an algorithm comparing the angle of the line between the fingers at the start and at the drag, or one that uses the cross product of the line between the fingers and the relative motion of the second finger. (Although the second option sounds cool and math-y, I think the first will work better.)
• Create the grid of 10 x10 squares. Likely to be tougher than it sounds - I don't just want to make a grid of chips like I did earlier - I need to make outward-pointing chains of chips that nest together effectively.
• Make the selector "snap" to the grid orientation and position. Preferably, this should be animated...
• Start recognizing where the four squares of the selector are, and which Chips they represent. This means that I will have to search a list of 100 Chips. I wonder if it will be worth keeping the list sorted somehow?
• Deciding (and implementing) what the user interface should be when I wish to "select" a group of Chips. Should it be a quick shake (+/- z-axis) of the iPad? A quick tap on the screen? Both?

Fun, fun, fun!