refactor: adjust the project infra. (#1)

* refactor: adjust the project infra.

This patch adds cmake build system to the project, and adjust infrastructure
stuff.
Signed-off-by: Jun Zhang <jun@junz.org>

* fix: remove compiler flags that only exist in GCC.

Signed-off-by: Jun Zhang <jun@junz.org>

1 files changed, 54 insertions, 0 deletions

diff --git a/src/level.cpp b/src/level.cpp
new file mode 100644
index 0000000..4df1d5a
--- /dev/null
+++ b/src/level.cpp
@@ -0,0 +1,54 @@
+#include "level.h"
+
+Level::Level(int width, int height)
+	: m_width(width), m_height(height)
+{
+	m_tiles = new uint8_t[width * height];
+	memset(m_tiles, 0, width * height);
+}
+
+uint8_t Level::get(int x, int y)
+{
+	if (inBounds(x, y)) {
+		return m_tiles[x + y * m_width];
+	} else {
+		return 0;
+	}
+}
+
+void Level::set(int x, int y, uint8_t tile)
+{
+	if (inBounds(x, y)) 
+		m_tiles[x + y * m_width] = tile;
+}
+
+RailDirection ChooseDirection(Level& level, int x, int y)
+{
+	if (!level.inBounds(x, y)) return NorthSouth;
+
+	bool n = level.get(x, y - 1) > 0;
+	bool e = level.get(x + 1, y) > 0;
+	bool s = level.get(x, y + 1) > 0;
+	bool w = level.get(x - 1, y) > 0;
+
+	if ((n || s) && !(e || w)) {
+		return NorthSouth;
+	}
+	if ((e || w) && !(n || s)) {
+		return EastWest;
+	}
+	else if (s && e) {
+		return SouthEast;
+	}
+	else if (s && w) {
+		return SouthWest;
+	}
+	else if (n && w) {
+		return NorthWest;
+	}
+	else if (n && e) {
+		return NorthEast;
+	}
+
+	return NorthSouth;
+}
\ No newline at end of file