Rotating some points , seems slow

[boriel]

I was going to make a vector graphics game like asteroids but different
I rotated some points around an origin but even that seems too slow

I was going to draw lines between the points

There is little you can do in your code, I guess. Some tips:

1. Not a huge optimization, but more elegant: initialize the trishipx array directly
   
2. Most of the demos I know cache all pre-calculated values in a table. So do something like DIM fSIN(360) As Fixed might be a good idea.
   
3. The above might be even faster if you use PEEK instead of array access.
   
4. The lines in the fsin / fcos degree calculates twice these values.

For the last point, consider:

Code:

transformedX= fCos(degrees) * (trishipx(x)-pointx) - fSin(degrees) * (trishipy(x)-pointy) + pointx
transformedY = fSin(degrees) * (trishipx(x)-pointx) + fCos(degrees) * (trishipy(x)-pointy) + pointy

To be rewritten as

Code:

Dim fc, fs, tx, ty As Fixed
fc = fCos(degrees)
fs = fSin(degrees)
tx = trishipx(x) - pointx
ty = trishipy(x) - pointy

transformedX= fc * tx - fs * ty + pointx
transformedY = fs * tx + fc * ty + pointy

And remember that variables declared (DIMed) within a function have slower access. This is because they are relative to the stack pointer (IX). Global variables are much faster. At the moment the compiler does not support static variables. :oops:

Maybe Britlion can give you more suggestions, as he is an optimization expert