| 63 | } |
| 64 | |
| 65 | static int ClipCell(cpShape* shape, |
| 66 | cpVect center, |
| 67 | int i, |
| 68 | int j, |
| 69 | struct WorleyContex* context, |
| 70 | cpVect* verts, |
| 71 | cpVect* clipped, |
| 72 | int count) |
| 73 | { |
| 74 | cpVect other = WorleyPoint(i, j, context); |
| 75 | // printf(" other %dx%d: (% 5.2f, % 5.2f) ", i, j, other.x, other.y); |
| 76 | if (cpShapePointQuery(shape, other, NULL) > 0.0f) |
| 77 | { |
| 78 | // printf("excluded\n"); |
| 79 | memcpy(clipped, verts, count * sizeof(cpVect)); |
| 80 | return count; |
| 81 | } |
| 82 | else |
| 83 | { |
| 84 | // printf("clipped\n"); |
| 85 | } |
| 86 | |
| 87 | cpVect n = cpvsub(other, center); |
| 88 | cpFloat dist = cpvdot(n, cpvlerp(center, other, 0.5f)); |
| 89 | |
| 90 | int clipped_count = 0; |
| 91 | for (int j = 0, i = count - 1; j < count; i = j, j++) |
| 92 | { |
| 93 | cpVect a = verts[i]; |
| 94 | cpFloat a_dist = cpvdot(a, n) - dist; |
| 95 | |
| 96 | if (a_dist <= 0.0) |
| 97 | { |
| 98 | clipped[clipped_count] = a; |
| 99 | clipped_count++; |
| 100 | } |
| 101 | |
| 102 | cpVect b = verts[j]; |
| 103 | cpFloat b_dist = cpvdot(b, n) - dist; |
| 104 | |
| 105 | if (a_dist * b_dist < 0.0f) |
| 106 | { |
| 107 | cpFloat t = cpfabs(a_dist) / (cpfabs(a_dist) + cpfabs(b_dist)); |
| 108 | |
| 109 | clipped[clipped_count] = cpvlerp(a, b, t); |
| 110 | clipped_count++; |
| 111 | } |
| 112 | } |
| 113 | |
| 114 | return clipped_count; |
| 115 | } |
| 116 | |
| 117 | static void ShatterCell(cpSpace* space, |
| 118 | cpShape* shape, |
no test coverage detected