It is suppose to compile? I get: t4.d(16): Error: incompatible types for ((cast(real)1 - t) * (bezier(p[0u..__dollar - 1u],t))): 'real' and 'real[3u]' t4.d(16): Error: incompatible types for ((t) * (bezier(p[1u..__dollar],t))): 'real' and 'real[3u]' t4.d(43): Error: template instance t4.bezier!(3u,real) error instantiating
On Mon, Jul 9, 2012 at 6:16 AM, Gor Gyolchanyan <gor.f.gyolchan...@gmail.com> wrote: > I've put together a code sample, which could demonstrate the awesome power > of D when it comes to getting good results very quickly and safely. Perhaps > it could end up on display for newcomers: > > import std.traits; > > /// Returns the t-th point on the bezier curve, defined by non-empty set p > of d-dimensional points, where t : [0, 1] and d > 1. > real[d] bezier(size_t d, Number)(Number[d][] p, Number t) > if(d > 1 && isFloatingPoint!Number) > in > { > assert(p.length > 0); > assert(t >= 0.0L && t <= 1.0L); > } > body > { > return p.length > 1 ? (1 - t) * p[0..$-1].bezier(t) + t * > p[1..$].bezier(t) : p[0]; > } > > /// Returns k unidistant points on the bezier curve, defined by non-empty > set p of d-dimensional points, where k > 0 and d > 1. > real[d][] bezier(size_t d, Number)(Number[d][] p, size_t k) > if(d > 1 && isFloatingPoint!Number) > in > { > assert(p.length > 0); > assert(k > 0); > } > body > { > Number[d][] result = new Number[d][k]; > foreach(i; 0..k) > result[k] = p.bezier(i * (1.0L / k)); > return result; > } > > -- > Bye, > Gor Gyolchanyan.