Inside the Teenage Engineering OP-1 there's a beautiful little choplifter game. This is a javascript clone. In-progress!
In progress. Try pressing keys a, s, d, f and j, k, l, ;. You can also you use your mouse cursor to toss the objects around.
After running binwalk on the firmware for the OP-1, poke around the files and you'll find lots of interesting things. You'll see that all of the OP-1's display & animations are done by manipulating svg images. There's a file called lander.svg which can be peeled back to reveal everything in the choplifter world, including its physics layer.
Having the lander.svg image is nice, but it'd also be nice to know more about which physics engine TE's game uses. Fortunately, there's a few clues in the OP-1 firmware. If you run the strings command with the file OP1_vdk.ldr you'll find that there's still quite a bit of ASCII still hiding in the firmware. Most of this is probably debug info, but it tells us a lot about how the OP-1 and choplifter were built.
..\ext\Box2D\Source\Common\b2BlockAllocator.cpp:185 found
..\ext\Box2D\Source\Dynamics\b2Body.cpp:117 m_world->m_lock == false
..\ext\Box2D\Source\Dynamics\b2Body.cpp:240 m_world->m_lock == false
..\ext\Box2D\Source\Dynamics\b2Body.cpp:273 m_I > 0.0f
..\ext\Box2D\Source\Dynamics\b2Body.cpp:314 m_world->m_lock == false
..\ext\Box2D\Source\Dynamics\b2Body.cpp:26 world->m_lock == false
..\ext\Box2D\Source\Dynamics\b2Body.cpp:111 m_world->m_lock == false
Rebuilding the choplifter world with all its bodies and fixtures with Box2dWeb would require >2000 lines of javascript. Rather than coding this all out by hand, I decided to write a small Python script to parse all the circles, rectangles, and polygons in an SVG drawing and initalize a Box2dWeb world with all its physics bodies & fixtures. Check it out: SVG-Box2dWeb. About 90% of the code in ./js/choplifter.js was generated using this script.
- implement scale & doors
- implement sound