From 8ce61ed633107121e1209f8245f1a19ebc022f83 Mon Sep 17 00:00:00 2001
From: Moritz Lipp <mlq@pwmt.org>
Date: Thu, 19 Jan 2012 00:37:58 +0100
Subject: [PATCH] Implement recalc_rectangle

This function should be used to recalculate the coordinates of
a rectangle to its new coordinates on the rendered page
(depending on the current scale and rotation value)
---
 utils.c | 38 ++++++++++++++++++++++++++++++++++++++
 utils.h | 10 ++++++++++
 2 files changed, 48 insertions(+)

diff --git a/utils.c b/utils.c
index 4c36d5a..01406e9 100644
--- a/utils.c
+++ b/utils.c
@@ -201,3 +201,41 @@ page_calculate_offset(zathura_page_t* page)
 
   return offset;
 }
+
+zathura_rectangle_t
+recalc_rectangle(zathura_page_t* page, zathura_rectangle_t rectangle)
+{
+  if (page == NULL || page->document == NULL) {
+    return rectangle;
+  }
+
+  zathura_rectangle_t tmp;
+
+  switch (page->document->rotate) {
+    case 90:
+      tmp.x1 = rectangle.y2 * page->document->scale;
+      tmp.x2 = rectangle.y1 * page->document->scale;
+      tmp.y1 = rectangle.x1 * page->document->scale;
+      tmp.y2 = rectangle.x2 * page->document->scale;
+      break;
+    case 180:
+      tmp.x1 = (page->width - rectangle.x2) * page->document->scale;
+      tmp.x2 = (page->width - rectangle.x1) * page->document->scale;
+      tmp.y1 = rectangle.y2 * page->document->scale;
+      tmp.y2 = rectangle.y1 * page->document->scale;
+      break;
+    case 270:
+      tmp.x1 = (page->height - rectangle.y1) * page->document->scale;
+      tmp.x2 = (page->height - rectangle.y2) * page->document->scale;
+      tmp.y1 = (page->width  - rectangle.x2) * page->document->scale;
+      tmp.y2 = (page->width  - rectangle.x1) * page->document->scale;
+      break;
+    default:
+      tmp.x1 = rectangle.x1 * page->document->scale;
+      tmp.x2 = rectangle.x2 * page->document->scale;
+      tmp.y1 = (page->height - rectangle.y1) * page->document->scale;
+      tmp.y2 = (page->height - rectangle.y2) * page->document->scale;
+  }
+
+  return tmp;
+}
diff --git a/utils.h b/utils.h
index 499e654..733f833 100644
--- a/utils.h
+++ b/utils.h
@@ -71,4 +71,14 @@ void document_index_build(GtkTreeModel* model, GtkTreeIter* parent, girara_tree_
  */
 page_offset_t* page_calculate_offset(zathura_page_t* page);
 
+/**
+ * Calculates the new coordinates based on the rotation and scale level of the
+ * document for the given rectangle
+ *
+ * @param page Page where the rectangle should be
+ * @param rectangle The rectangle
+ * @return New rectangle
+ */
+zathura_rectangle_t recalc_rectangle(zathura_page_t* page, zathura_rectangle_t rectangle);
+
 #endif // UTILS_H