On 04/29/2013 07:08 PM, Lorenzo Marcantonio wrote:
Looking around for angles I noticed a thing... especially when computing distance (like using hypot or a whole sqrt expression), sometimes the result is KiROUND-ed while often a simple (int) truncation is done.Simple example (from the plotting routines, where rounding *would* matter for gerbers): start.x = centre.x + (int) ( radius * cos( -alpha ) ); start.y = centre.y + (int) ( radius * sin( -alpha ) ); IMHO these should be KiROUNDed, instead of casted. The same appears often when computing, for example, a circle radius; since we have good geometric functions we could go from (this is from the autorouter): radius = (int) sqrt( (double) ( cx - ux0 ) * ( cx - ux0 ) + (double) ( cy - uy0 ) * ( cy - uy0 ) ); to radius = KiROUND( Distance( ux0, uy0, cx, cy ) ); which I hope everyone agree is better (if only for the expression itself). Are there situations where some geometrical variable should *not* be rounded and instead just cast to int?
Hi Lorenzo, My 0.001 cent - It's much simpler: just don't use floating point. Tom _______________________________________________ Mailing list: https://launchpad.net/~kicad-developers Post to : [email protected] Unsubscribe : https://launchpad.net/~kicad-developers More help : https://help.launchpad.net/ListHelp
