From 562c5ebc328896f7046f9fd3750707f3b72d9194 Mon Sep 17 00:00:00 2001
From: Raimon Zamora <jaildoctor@gmail.com>
Date: Wed, 12 May 2021 17:42:30 +0200
Subject: [PATCH] [FEAT] Added support to scroll tile by tile

---
 main.cpp | 34 ++++++++++++++++++++++++----------
 1 file changed, 24 insertions(+), 10 deletions(-)

diff --git a/main.cpp b/main.cpp
index c781e5f..142851b 100644
--- a/main.cpp
+++ b/main.cpp
@@ -483,19 +483,33 @@ void DoTileMap() {
 		if (keyJustPressed == SDL_SCANCODE_F) { Undo_Op(); FloodFill(); }
 		if (keyJustPressed == SDL_SCANCODE_R) { Undo_Op(); ReplaceTile(); }
 
+		static int scroll_x = 0;
+		static int scroll_y = 0;
+		static int old_map_x = 0;
+		static int old_map_y = 0;
+
 		if (mouse.mouse_down[MOUSE_BUTTON_LEFT] || mouse.mouse_down[MOUSE_BUTTON_RIGHT]) { Undo_Op(); }
+		if (mouse.mouse_down[MOUSE_BUTTON_LEFT]) {
+			old_map_x = map_x; old_map_y = map_y;
+			scroll_x = cur_x; scroll_y = cur_y;
+		}
 		if (mouse.buttons[MOUSE_BUTTON_RIGHT]) { if (tile_back < sprites) map[(map_x + cur_x) + (map_y + cur_y)*map_width] = tile_back; }
-		if (mouse.buttons[MOUSE_BUTTON_LEFT]) { 
-			const int pos = (map_x + cur_x) + (map_y + cur_y)*map_width;
-			if (tile_sel >= sprites) {
-				ignoreMouse = true;
-				if (map[pos + (map_width*map_height)] == 0) {
-					map[pos + (map_width*map_height)] = tile_sel;
-				} else {
-					map[pos + (map_width*map_height)] = 0;
-				}
+		if (mouse.buttons[MOUSE_BUTTON_LEFT]) {
+			if (keyboard[SDL_SCANCODE_SPACE]) {
+				map_x = old_map_x - (cur_x - scroll_x);
+				map_y = old_map_y - (cur_y - scroll_y);
 			} else {
-				map[pos] = tile_sel;
+				const int pos = (map_x + cur_x) + (map_y + cur_y)*map_width;
+				if (tile_sel >= sprites) {
+					ignoreMouse = true;
+					if (map[pos + (map_width*map_height)] == 0) {
+						map[pos + (map_width*map_height)] = tile_sel;
+					} else {
+						map[pos + (map_width*map_height)] = 0;
+					}
+				} else {
+					map[pos] = tile_sel;
+				}
 			}
 		}
 		if (mouse.buttons[MOUSE_BUTTON_MIDDLE]) { tile_sel = map[(map_x + cur_x) + (map_y + cur_y)*map_width]; }