From c661f8663a2ca6ff0debc222a9fbb4a1167dba5a Mon Sep 17 00:00:00 2001
From: Nipun Garg
Date: Tue, 18 Jun 2019 05:47:12 +0530
Subject: HDB: Add the centerMapXY to center the map

---
 engines/hdb/map-loader.cpp | 63 ++++++++++++++++++++++++++++++++++++++++++++++
 engines/hdb/map-loader.h   |  1 +
 2 files changed, 64 insertions(+)

(limited to 'engines')

diff --git a/engines/hdb/map-loader.cpp b/engines/hdb/map-loader.cpp
index c5d682c03a..f66783f14f 100644
--- a/engines/hdb/map-loader.cpp
+++ b/engines/hdb/map-loader.cpp
@@ -264,4 +264,67 @@ void Map::setMapXY(int x, int y) {
 	_mapY = y;
 }
 
+// Sets _mapX and _mapY and tries to center the map around X, Y
+void Map::centerMapXY(int x, int y) {
+	int checkx = x / kTileWidth;
+	int checky = y / kTileHeight;
+
+	int minx, miny, maxx, maxy;
+
+	// Scan from centerX to right edge
+	maxx = (_width - (16/2)) * kTileWidth;
+	for (int i = checkx + 1; i <= checkx + (16 / 2); i++) {
+		if (!getMapBGTileIndex(i, checky)) {
+			maxx = (i - (16 / 2)) * kTileWidth;
+			break;
+		}
+	}
+
+	// Scan from centerX to left edge
+	minx = 0;
+	for (int i = checkx - 1; i >= checkx - (16 / 2); i--) {
+		if (!getMapBGTileIndex(i, checky)) {
+			// +1 because we don't want to see one whole tile
+			minx = (1 + i + (16 / 2)) * kTileWidth;
+			break;
+		}
+	}
+
+	// Scan from centerY to bottom edge
+	maxy = (_height - (16/2)) * kTileHeight;
+	for (int i = checky + 1; i <= checky + (16 / 2); i++) {
+		if (!getMapBGTileIndex(checkx, i)) {
+			maxy = (i - (16 / 2)) * kTileHeight;
+			break;
+		}
+	}
+
+	// Scan from centerY to top edge
+	miny = 0;
+	for (int i = checky - 1; i >= checkx - (16 / 2); i--) {
+		if (!getMapBGTileIndex(checkx, i)) {
+			// +! because we don't want to see one whole tile
+			miny = (1 + i + (16 / 2)) * kTileHeight;
+			break;
+		}
+	}
+
+	if (x < minx) {
+		x = minx;
+	} else if (x > maxx) {
+		x = maxx;
+	}
+
+	if (y < miny) {
+		y = miny;
+	} else if (y > maxy) {
+		y = maxy;
+	}
+
+	x -= (480 / 2);
+	y -= (480 / 2);
+
+	setMapXY(x, y);
+}
+
 }
diff --git a/engines/hdb/map-loader.h b/engines/hdb/map-loader.h
index 35f1357ec3..d2266818b3 100644
--- a/engines/hdb/map-loader.h
+++ b/engines/hdb/map-loader.h
@@ -62,6 +62,7 @@ public:
 	uint16 getMapFGTileIndex(int x, int y);
 	void getMapXY(int *x, int *y);
 	void setMapXY(int x, int y);
+	void centerMapXY(int x, int y);
 
 	int _mapX, _mapY; // Coordinates of Map
 	int _mapTileX, _mapTileY; // Tile Coordinates of Map
-- 
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