X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ian/git?p=moebius2.git;a=blobdiff_plain;f=energy.c;h=540f6a909e7509926f9b62329a65917e2fed0b84;hp=9c351a52b9349b327547b7122172944071a9e0d3;hb=2e47daae84f617abb80defe005a87c239406a129;hpb=289edb461ff46150a66983e290438a725505d261 diff --git a/energy.c b/energy.c index 9c351a5..540f6a9 100644 --- a/energy.c +++ b/energy.c @@ -1,180 +1,180 @@ - /* - * We try to find an optimal triangle grid - */ +/* + * We try to find an optimal triangle grid + */ - #include "common.h" - #include "minimise.h" - #include "mgraph.h" +#include "common.h" +#include "minimise.h" +#include "mgraph.h" - double vertex_areas[N], vertex_mean_edge_lengths[N], edge_lengths[N][V6]; +double vertex_areas[N], vertex_mean_edge_lengths[N], edge_lengths[N][V6]; - static double best_energy= DBL_MAX; +static double best_energy= DBL_MAX; - static void addcost(double *energy, double tweight, double tcost, int pr); - #define COST(weight, compute) addcost(&energy, (weight), (compute), printing) +static void addcost(double *energy, double tweight, double tcost, int pr); +#define COST(weight, compute) addcost(&energy, (weight), (compute), printing) - void energy_init(void) { - } +void energy_init(void) { +} - /*---------- main energy computation and subroutines ----------*/ +/*---------- main energy computation and subroutines ----------*/ - double compute_energy(const struct Vertices *vs) { - static int bests_unprinted; +double compute_energy(const struct Vertices *vs) { + static int bests_unprinted; - double energy; - int printing; + double energy; + int printing; - compute_edge_lengths(vs->a); - compute_vertex_areas(vs->a); - energy= 0; + compute_edge_lengths(vs->a); + compute_vertex_areas(vs->a); + energy= 0; - printing= printing_check(pr_cost,0); + printing= printing_check(pr_cost,0); - if (printing) printf("%15lld c>e |", evaluations); + if (printing) printf("%15lld c>e |", evaluations); - if (XBITS==3) { - COST( 3e3, line_bending_cost(vs->a)); - COST( 3e3, edge_length_variation_cost(vs->a)); - COST( 0.4e3, rim_proximity_cost(vs->a)); - COST( 1e6, edge_angle_cost(vs->a, 0.5/1.7)); - // COST( 1e1, small_triangles_cost(vs->a)); - COST( 1e12, noncircular_rim_cost(vs->a)); - stop_epsilon= 1e-6; - } else if (XBITS==4) { - COST( 3e5, line_bending_cost(vs->a)); - COST( 10e2, edge_length_variation_cost(vs->a)); - COST( 9.0e1, rim_proximity_cost(vs->a)); // 5e1 is too much + if (XBITS==3) { + COST( 3e3, line_bending_cost(vs->a)); + COST( 3e3, edge_length_variation_cost(vs->a)); + COST( 0.4e3, rim_proximity_cost(vs->a)); + COST( 1e6, edge_angle_cost(vs->a, 0.5/1.7)); +// COST( 1e1, small_triangles_cost(vs->a)); + COST( 1e12, noncircular_rim_cost(vs->a)); + stop_epsilon= 1e-6; + } else if (XBITS==4) { + COST( 3e5, line_bending_cost(vs->a)); + COST( 10e2, edge_length_variation_cost(vs->a)); + COST( 9.0e1, rim_proximity_cost(vs->a)); // 5e1 is too much // 2.5e1 is too little - // 0.2e1 grows compared to previous ? - // 0.6e0 shrinks compared to previous ? - COST( 1e12, edge_angle_cost(vs->a, 0.5/1.3)); - COST( 1e18, noncircular_rim_cost(vs->a)); - stop_epsilon= 1e-6; - } else { - abort(); - } - - if (printing) printf("| total %# e |", energy); - - if (energy < best_energy) { - FILE *best_f; - int r; - - if (printing) { - printf(" BEST"); - if (bests_unprinted) printf(" [%4d]",bests_unprinted); - bests_unprinted= 0; - } else { - bests_unprinted++; - } - - best_f= fopen(best_file_tmp,"wb"); if (!best_f) diee("fopen new out"); - r= fwrite(vs->a,sizeof(vs->a),1,best_f); if (r!=1) diee("fwrite"); - if (fclose(best_f)) diee("fclose new best"); - if (rename(best_file_tmp,best_file)) diee("rename install new best"); - - best_energy= energy; - } - if (printing) { - putchar('\n'); - flushoutput(); - } - - evaluations++; - return energy; - } - - static void addcost(double *energy, double tweight, double tcost, int pr) { - double tenergy= tweight * tcost; - if (pr) printf(" %# e x %g > %# e* |", tcost, tweight, tenergy); - *energy += tenergy; - } - - /*---------- Precomputations ----------*/ - - void compute_edge_lengths(const Vertices vertices) { - int v1,e,v2; - - FOR_EDGE(v1,e,v2) - edge_lengths[v1][e]= hypotD(vertices[v1],vertices[v2]); - } - - void compute_vertex_areas(const Vertices vertices) { - int v0,v1,v2, e1,e2; - // int k; - - FOR_VERTEX(v0) { - double total= 0.0, edges_total=0; - int count= 0; - - FOR_VEDGE(v0,e1,v1) { - e2= (e1+1) % V6; - v2= EDGE_END2(v0,e2); - if (v2<0) continue; - - edges_total += edge_lengths[v0][e1]; - - // double e1v[D3], e2v[D3], av[D3]; - // K { - // e1v[k]= vertices[v1][k] - vertices[v0][k]; - // e2v[k]= vertices[v2][k] - vertices[v0][k]; - // } - // xprod(av, e1v, e2v); - // total += magnD(av); - - count++; - } - vertex_areas[v0]= total / count; - vertex_mean_edge_lengths[v0]= edges_total / count; - } - } - - /*---------- Edgewise vertex displacement ----------*/ - - /* - * Definition: - * - * At each vertex Q, in each direction e: - * - * e - * Q ----->----- R - * _,-'\__/ - * _,-' delta - * P ' - * - * r - * cost = delta (we use r=3) - * Q,e - * - * - * Calculation: - * - * Let vector A = PQ - * B = QR - * - * -1 A . B - * delta = tan ------- - * | A x B | - * - * which is always in the range 0..pi because the denominator - * is nonnegative. We add epsilon to |AxB| to avoid division - * by zero. - * - * r - * cost = delta - * Q,e - */ - - double line_bending_cost(const Vertices vertices) { - static const double axb_epsilon= 1e-6; - static const double exponent_r= 4; - - int pi,e,qi,ri, k; - double a[D3], b[D3], axb[D3]; - double total_cost= 0; - - FOR_EDGE(qi,e,ri) { - pi= EDGE_END2(qi,(e+3)%V6); if (pi<0) continue; + // 0.2e1 grows compared to previous ? + // 0.6e0 shrinks compared to previous ? + COST( 1e12, edge_angle_cost(vs->a, 0.5/1.3)); + COST( 1e18, noncircular_rim_cost(vs->a)); + stop_epsilon= 1e-6; + } else { + abort(); + } + + if (printing) printf("| total %# e |", energy); + + if (energy < best_energy) { + FILE *best_f; + int r; + + if (printing) { + printf(" BEST"); + if (bests_unprinted) printf(" [%4d]",bests_unprinted); + bests_unprinted= 0; + } else { + bests_unprinted++; + } + + best_f= fopen(best_file_tmp,"wb"); if (!best_f) diee("fopen new out"); + r= fwrite(vs->a,sizeof(vs->a),1,best_f); if (r!=1) diee("fwrite"); + if (fclose(best_f)) diee("fclose new best"); + if (rename(best_file_tmp,best_file)) diee("rename install new best"); + + best_energy= energy; + } + if (printing) { + putchar('\n'); + flushoutput(); + } + + evaluations++; + return energy; +} + +static void addcost(double *energy, double tweight, double tcost, int pr) { + double tenergy= tweight * tcost; + if (pr) printf(" %# e x %g > %# e* |", tcost, tweight, tenergy); + *energy += tenergy; +} + +/*---------- Precomputations ----------*/ + +void compute_edge_lengths(const Vertices vertices) { + int v1,e,v2; + + FOR_EDGE(v1,e,v2) + edge_lengths[v1][e]= hypotD(vertices[v1],vertices[v2]); +} + +void compute_vertex_areas(const Vertices vertices) { + int v0,v1,v2, e1,e2; +// int k; + + FOR_VERTEX(v0) { + double total= 0.0, edges_total=0; + int count= 0; + + FOR_VEDGE(v0,e1,v1) { + e2= (e1+1) % V6; + v2= EDGE_END2(v0,e2); + if (v2<0) continue; + + edges_total += edge_lengths[v0][e1]; + +// double e1v[D3], e2v[D3], av[D3]; +// K { +// e1v[k]= vertices[v1][k] - vertices[v0][k]; +// e2v[k]= vertices[v2][k] - vertices[v0][k]; +// } +// xprod(av, e1v, e2v); +// total += magnD(av); + + count++; + } + vertex_areas[v0]= total / count; + vertex_mean_edge_lengths[v0]= edges_total / count; + } +} + +/*---------- Edgewise vertex displacement ----------*/ + + /* + * Definition: + * + * At each vertex Q, in each direction e: + * + * e + * Q ----->----- R + * _,-'\__/ + * _,-' delta + * P ' + * + * r + * cost = delta (we use r=3) + * Q,e + * + * + * Calculation: + * + * Let vector A = PQ + * B = QR + * + * -1 A . B + * delta = tan ------- + * | A x B | + * + * which is always in the range 0..pi because the denominator + * is nonnegative. We add epsilon to |AxB| to avoid division + * by zero. + * + * r + * cost = delta + * Q,e + */ + +double line_bending_cost(const Vertices vertices) { + static const double axb_epsilon= 1e-6; + static const double exponent_r= 4; + + int pi,e,qi,ri, k; + double a[D3], b[D3], axb[D3]; + double total_cost= 0; + + FOR_EDGE(qi,e,ri) { + pi= EDGE_END2(qi,(e+3)%V6); if (pi<0) continue; //if (!(qi&XMASK)) fprintf(stderr,"%02x-%02x-%02x (%d)\n",pi,qi,ri,e);