render: Center and emphasize table titles.

[pspp] / src / output / render.c

diff --git a/src/output/render.c b/src/output/render.c
index 3ac603527e3a33fe73e3b72e068ac84c2eeba0a6..0585d2362236889b18e38da7bf35c4cdca119ad4 100644 (file)
--- a/src/output/render.c
+++ b/src/output/render.c
@@ -933,6 +933,33 @@ render_page_get_size (const struct render_page *page, enum table_axis axis)
   return page->cp[axis][page->n[axis] * 2 + 1];
 }
 
+/* If PAGE is smaller than SIZE along AXIS, inserts extra space to increase
+   its size to SIZE. */
+void
+render_page_stretch (struct render_page *page, enum table_axis axis,
+                     int size)
+{
+  int extra = size - render_page_get_size (page, axis);
+  if (extra > 0)
+    {
+      int n = page->n[axis];
+      int error = 0;
+      int adjust = 0;
+      int i;
+
+      for (i = 2; i <= 2 * n + 1; i++)
+        {
+          if (!(i & 1))
+            {
+              error += extra;
+              adjust += error / n;
+              error %= n;
+            }
+          page->cp[axis][i] += adjust;
+        }
+    }
+}
+
 int
 render_page_get_best_breakpoint (const struct render_page *page, int height)
 {
@@ -1416,12 +1443,15 @@ struct render_pager
     struct render_break y_break;
   };
 
-static void
+static struct render_page *
 render_pager_add_table (struct render_pager *p, struct table *table)
 {
+  struct render_page *page;
+
   if (p->n_pages >= p->allocated_pages)
     p->pages = x2nrealloc (p->pages, &p->allocated_pages, sizeof *p->pages);
-  p->pages[p->n_pages++] = render_page_create (p->params, table);
+  page = p->pages[p->n_pages++] = render_page_create (p->params, table);
+  return page;
 }
 
 static void
@@ -1483,17 +1513,37 @@ struct render_pager *
 render_pager_create (const struct render_params *params,
                      const struct table_item *table_item)
 {
+  const char *caption = table_item_get_caption (table_item);
+  const char *title = table_item_get_title (table_item);
+  const struct render_page *body_page;
+  struct render_page *title_page;
   struct render_pager *p;
-  const char *title;
 
   p = xzalloc (sizeof *p);
   p->params = params;
 
-  title = table_item_get_title (table_item);
-  if (title)
-    render_pager_add_table (p, table_from_string (TAB_LEFT, title));
-  render_pager_add_table (p, table_ref (table_item_get_table (table_item)));
-  add_footnote_page (p, p->pages[p->n_pages - 1]);
+  /* Title. */
+  title_page = (title
+                ? render_pager_add_table (
+                  p, table_from_string (TAB_CENTER | TAB_EMPH, title))
+                : NULL);
+
+  /* Body. */
+  body_page = render_pager_add_table (p, table_ref (table_item_get_table (
+                                                      table_item)));
+  if (title_page && body_page)
+    {
+      int body_page_size = render_page_get_size (body_page, H);
+      render_page_stretch (title_page, H,
+                           MIN (body_page_size, params->size[H]));
+    }
+
+  /* Caption. */
+  if (caption)
+    render_pager_add_table (p, table_from_string (TAB_LEFT, caption));
+
+  /* Footnotes. */
+  add_footnote_page (p, body_page);
 
   render_pager_start_page (p);