From 38e9a97a8583756f533019b3eaf5d568b86dd2e4 Mon Sep 17 00:00:00 2001
From: Fabien Freling <public@ffreling.com>
Date: Wed, 16 Feb 2022 13:59:14 +0100
Subject: [PATCH] add A2 stub

---
 src/a2.cpp       | 18 ++++++++++++++++++
 src/a2.h         | 17 +++++++++++++++++
 src/main_gui.cpp | 21 ++++++++++++++++++++-
 3 files changed, 55 insertions(+), 1 deletion(-)
 create mode 100644 src/a2.cpp
 create mode 100644 src/a2.h

diff --git a/src/a2.cpp b/src/a2.cpp
new file mode 100644
index 0000000..fe50fdb
--- /dev/null
+++ b/src/a2.cpp
@@ -0,0 +1,18 @@
+#include "a2.h"
+
+namespace freling {
+
+std::vector<BoundingBox> A2(const std::vector<BoundingBox>& regions) {
+    std::vector<BoundingBox> updated_boxes(regions.size());
+    for (int i = 0, size = regions.size(); i < size; ++i) {
+        auto& box = updated_boxes[i];
+        const auto& region = regions[i];
+        box.x = region.x + 2;
+        box.y = region.y + 2;
+        box.width = region.width - 4;
+        box.height = region.height - 4;
+    }
+    return updated_boxes;
+}
+
+}  // namespace freling
diff --git a/src/a2.h b/src/a2.h
new file mode 100644
index 0000000..7bc6b9b
--- /dev/null
+++ b/src/a2.h
@@ -0,0 +1,17 @@
+#pragma once
+
+#include <vector>
+
+#include "bounding_box.h"
+
+namespace freling {
+
+// The normal signature for this function should be:
+// std::vector<BoundingBox> A2(const Frame& regions);
+// However, since we are mocking this algorithm we just need to fulfill this
+// constraint: "We assume for the sake of simplicity, that no bounding boxe
+// in B′ overlaps more than one region in F Regions".
+// To do so, we need to have the original delimitation of regions.
+std::vector<BoundingBox> A2(const std::vector<BoundingBox>& regions);
+
+}  // namespace freling
diff --git a/src/main_gui.cpp b/src/main_gui.cpp
index e218a30..101b141 100644
--- a/src/main_gui.cpp
+++ b/src/main_gui.cpp
@@ -13,6 +13,7 @@
 #include <raygui.h>
 #pragma clang diagnostic pop
 
+#include "a2.h"
 #include "bounding_box.h"
 #include "frame.h"
 #include "pack.h"
@@ -95,6 +96,7 @@ int main(int argc, const char* argv[]) {
     const std::vector<Color> bbox_colors = {RED,    GREEN,  BLUE,
                                             YELLOW, ORANGE, PURPLE};
     std::vector<freling::BoundingBox> packed_bboxes;
+    std::vector<freling::BoundingBox> a2_bboxes;
 
     Vector2 win_size = {800, 450};
     const int padding = 5;
@@ -109,6 +111,7 @@ int main(int argc, const char* argv[]) {
     Image pack_img;
     Texture2D pack_texture;
     bool packed = false;
+    bool a2_processed = false;
 
     win_size.x = std::max(win_size.x, in_offset.x + in_texture.width + padding);
     win_size.y =
@@ -190,7 +193,7 @@ int main(int argc, const char* argv[]) {
                                   b_size.y},
                       "Pack Rects")) {
             std::optional<Frame> f_packed =
-                pack(*in_frame, bboxes, packed_bboxes);
+                freling::pack(*in_frame, bboxes, packed_bboxes);
 
             if (packed) {
                 UnloadTexture(pack_texture);
@@ -212,6 +215,13 @@ int main(int argc, const char* argv[]) {
             SetWindowSize(win_size.x, win_size.y);
         }
 
+        if (GuiButton((Rectangle){padding + (padding + b_size.x) * 2, padding,
+                                  b_size.x, b_size.y},
+                      "A2")) {
+            a2_bboxes = freling::A2(packed_bboxes);
+            a2_processed = true;
+        }
+
         //
         // Input image
         //
@@ -242,6 +252,15 @@ int main(int argc, const char* argv[]) {
                 draw(b, pack_offset, color);
                 ++c;
             };
+
+            if (a2_processed) {
+                int c = 0;
+                for (const auto& b : a2_bboxes) {
+                    const auto& color = bbox_colors[c % bbox_colors.size()];
+                    draw(b, pack_offset, color);
+                    ++c;
+                };
+            }
         }
 
         EndDrawing();