Work 07: Let’s see how your code stacks up to the competition

Note: If you are working in c, I have provided a basic stack library that you can use.

Time to implement a relative coordinate system… system, add/modify your current parser so it has the following behavior:

push
- Push a copy of the current top of the coordinate system (cs) stack onto the cs stack (a full copy, not just a reference to the current top… I’m looking at you python and java people)
pop
- Removes the top of the cs stack (nothing needs to be done with this data)
move/rotate/scale
1. create a translation/rotation/scale matrix
2. multiply the current top of the cs stack by it
3. The ordering of multiplication is important here.
box/sphere/torus
1. add a box/sphere/torus to a temporary polygon matrix
2. multiply it by the current top of the cs stack
3. draw it to the screen
4. clear the polygon matrix
line/curve/circle
1. add a line to a temporary edge matrix
2. multiply it by the current top
3. draw it to the screen (note a line is not a solid, so avoid draw_polygons)
4. clear the edge matrix
save
- save the screen with the provided file name
display
- show the image
Also note that the ident, apply and clear commands no longer have any use and can be removed.