+ /* Spacer constraints. */
+ for (i = 0; i < model->num_spacers; i++) {
+ x = model->spacers[i].a->position.x;
+ y = model->spacers[i].a->position.y;
+ dx = model->spacers[i].b->position.x - x;
+ dy = model->spacers[i].b->position.y - y;
+ distance = estimate_distance (dx, dy, model->spacers[i].length);
+ if (distance > model->spacers[i].length)
+ continue;
+ fraction = (distance - model->spacers[i].length) / distance / 2;
+ model->spacers[i].a->position.x = x + dx * fraction;
+ model->spacers[i].a->position.y = y + dy * fraction;
+ model->spacers[i].b->position.x = x + dx * (1 - fraction);
+ model->spacers[i].b->position.y = y + dy * (1 - fraction);
+ }
+