From 84b689ec06623c32b634b9824336b20e6fe38677 Mon Sep 17 00:00:00 2001
From: Joursoir <chat@joursoir.net>
Date: Thu, 18 Feb 2021 12:24:56 +0000
Subject: fix bug in rows/cols and improve diags scaning

---
 GameField.cpp | 70 ++++++++++++++++++++++++++++++++++++++++++++---------------
 GameField.hpp |  2 +-
 2 files changed, 54 insertions(+), 18 deletions(-)

diff --git a/GameField.cpp b/GameField.cpp
index acc742b..75485b4 100644
--- a/GameField.cpp
+++ b/GameField.cpp
@@ -53,7 +53,7 @@ void GameField::UpdateState(int y, int x)
 		return;
 	if((state = ScanColsAround(y, x)) != G_NONE)
 		return;
-	if((state = ScanDiags()) != G_NONE)
+	if((state = ScanDiagsAround(y, x)) != G_NONE)
 		return;
 }
 
@@ -61,7 +61,7 @@ int GameField::ScanRowsAround(int y, int x)
 {
 	int i, n;
 	int player = field[y][x];
-	// ray left
+	// ray to left
 	for(i = x, n = 0; i >= 0; i--) {
 		if(player == field[y][i]) {
 			n++;
@@ -71,8 +71,8 @@ int GameField::ScanRowsAround(int y, int x)
 		else break;
 	}
 
-	// ray right
-	for(i = x; i < rows; i++) {
+	// ray to right
+	for(i = x, n -= 1; i < rows; i++) {
 		if(player == field[y][i]) {
 			n++;
 			if(n == win_length)
@@ -88,7 +88,7 @@ int GameField::ScanColsAround(int y, int x)
 {
 	int i, n;
 	int player = field[y][x];
-	// ray up
+	// ray to up
 	for(i = y, n = 0; i >= 0; i--) {
 		if(player == field[i][x]) {
 			n++;
@@ -98,8 +98,8 @@ int GameField::ScanColsAround(int y, int x)
 		else break;
 	}
 
-	// ray down
-	for(i = y; i < cols; i++) {
+	// ray to down
+	for(i = y, n -= 1; i < cols; i++) {
 		if(player == field[i][x]) {
 			n++;
 			if(n == win_length)
@@ -111,15 +111,51 @@ int GameField::ScanColsAround(int y, int x)
 	return G_NONE;
 }
 
-/* This version is a dummy */
-int GameField::ScanDiags()
+int GameField::ScanDiagsAround(int y, int x)
 {
-	if(field[0][0] == field[1][1] && field[1][1] == field[2][2] &&
-			field[1][1] != G_EMPTY)
-		return field[1][1];
-	else if(field[0][2] == field[1][1] && field[1][1] == field[2][0] &&
-			field[1][1] != G_EMPTY)
-		return field[1][1];
-
-	return 0;
+	int i, j, n;
+	int player = field[y][x];
+	// ray to left up corner
+	for(i = x, j = y, n = 0; i >= 0 && j >= 0; i--, j--) {
+		if(player == field[j][i]) {
+			n++;
+			if(n == win_length)
+				return player;
+		}
+		else break;
+	}
+
+	// ray to right down corner
+	for(i = x, j = y, n -= 1; i < rows && j < cols; i++, j++) {
+		if(player == field[j][i]) {
+			n++;
+			if(n == win_length)
+				return player;
+		}
+		else break;
+	}
+	
+	/* change the diagonal */
+
+	// ray to right up corner
+	for(i = x, j = y, n = 0; i < rows && j >= 0; i++, j--) {
+		if(player == field[j][i]) {
+			n++;
+			if(n == win_length)
+				return player;
+		}
+		else break;
+	}
+
+	// ray to left down cornet
+	for(i = x, j = y, n -= 1; i >= 0 && j < cols; i--, j++) {
+		if(player == field[j][i]) {
+			n++;
+			if(n == win_length)
+				return player;
+		}
+		else break;
+	}
+
+	return G_NONE;
 }
diff --git a/GameField.hpp b/GameField.hpp
index 9975caa..4c6d61d 100644
--- a/GameField.hpp
+++ b/GameField.hpp
@@ -31,7 +31,7 @@ private:
 	void UpdateState(int y, int x);
 	int ScanRowsAround(int y, int x);
 	int ScanColsAround(int y, int x);
-	int ScanDiags();
+	int ScanDiagsAround(int y, int x);
 };
 
 #endif /* LPG_GAMEFIELD_H */
-- 
cgit v1.2.3-18-g5258