- $q1_pgs += floor($extra_pgs / 2);
- $q2_pgs += ceil($extra_pgs / 2);
-
- /* Adjust if the third and fourth quarter intersect. */
- } else if (($cur_pg + $q3_pgs + 1) >= ($tot_pgs - $q4_pgs + 1)) {
- $extra_pgs = $q3_pgs;
- $extra_pgs -= ceil(($tot_pgs - $cur_pg - $q4_pgs) * 3/4);
- $q3_pgs = ceil(($tot_pgs - $cur_pg - $q4_pgs) * 3/4);
- $q1_pgs += floor($extra_pgs / 2);
- $q2_pgs += ceil($extra_pgs / 2);
+
+ /* Otherwise, compute some magic to choose the four quarters. */
+ } else {
+ /*
+ * Compute the magic base values. Added together,
+ * these values will always equal to the $pag_pgs.
+ * NOTE: These are DEFAULT values and do not take
+ * the current page into account. That is below.
+ */
+ $q1_pgs = floor($vis_pgs/4);
+ $q2_pgs = round($vis_pgs/4, 0);
+ $q3_pgs = ceil($vis_pgs/4);
+ $q4_pgs = round(($vis_pgs - $q2_pgs)/3, 0);
+
+ /* Adjust if the first quarter contains the current page. */
+ if (($cur_pg - $q1_pgs) < 1) {
+ $extra_pgs = ($q1_pgs - ($cur_pg - 1)) + $q2_pgs;
+ $q1_pgs = $cur_pg - 1;
+ $q2_pgs = 0;
+ $q3_pgs += ceil($extra_pgs / 2);
+ $q4_pgs += floor($extra_pgs / 2);
+
+ /* Adjust if the first and second quarters intersect. */
+ } else if (($cur_pg - $q2_pgs - ceil($q2_pgs/3)) <= $q1_pgs) {
+ $extra_pgs = $q2_pgs;
+ $extra_pgs -= ceil(($cur_pg - $q1_pgs - 1) * 3/4);
+ $q2_pgs = ceil(($cur_pg - $q1_pgs - 1) * 3/4);
+ $q3_pgs += ceil($extra_pgs / 2);
+ $q4_pgs += floor($extra_pgs / 2);
+
+ /* Adjust if the fourth quarter contains the current page. */
+ } else if (($cur_pg + $q4_pgs) >= $tot_pgs) {
+ $extra_pgs = ($q4_pgs - ($tot_pgs - $cur_pg)) + $q3_pgs;
+ $q3_pgs = 0;
+ $q4_pgs = $tot_pgs - $cur_pg;
+ $q1_pgs += floor($extra_pgs / 2);
+ $q2_pgs += ceil($extra_pgs / 2);
+
+ /* Adjust if the third and fourth quarter intersect. */
+ } else if (($cur_pg + $q3_pgs + 1) >= ($tot_pgs - $q4_pgs + 1)) {
+ $extra_pgs = $q3_pgs;
+ $extra_pgs -= ceil(($tot_pgs - $cur_pg - $q4_pgs) * 3/4);
+ $q3_pgs = ceil(($tot_pgs - $cur_pg - $q4_pgs) * 3/4);
+ $q1_pgs += floor($extra_pgs / 2);
+ $q2_pgs += ceil($extra_pgs / 2);
+ }