1 files changed, 50 insertions, 0 deletions
diff --git a/crawl-ref/source/ray.h b/crawl-ref/source/ray.h
new file mode 100644
index 0000000000..0c2895574b
--- /dev/null
+++ b/crawl-ref/source/ray.h
@@ -0,0 +1,50 @@
+/*
+ *  File:       ray.h
+ *  Summary:    Ray definition
+ *  Written by: Linley Henzell
+ *
+ *  Modified for Crawl Reference by $Author: j-p-e-g $ on $Date: 2007-09-10 11:21:32 -0700 (Mon, 10 Sep 2007) $
+ *
+ *  Change History (most recent first):
+ *
+ * <1>     7/11/07    MPC   Split off from externs.h
+ */
+
+#ifndef RAY_H
+#define RAY_H
+
+struct ray_def
+{
+public:
+    double accx;
+    double accy;
+    double slope;
+    // Quadrant 1: down-right
+    // Quadrant 2: down-left
+    // Quadrant 3: up-left
+    // Quadrant 4: up-right
+    int quadrant;
+    int fullray_idx;            // for cycling: where did we come from?
+
+public:
+    ray_def();
+    int x() const { return static_cast<int>(accx); }
+    int y() const { return static_cast<int>(accy); }
+    coord_def pos() const { return coord_def(x(), y()); }
+    
+    // returns the direction taken (0,1,2)
+    int advance(bool shorten = false, const coord_def *p = NULL);
+    int advance_through(const coord_def &point);
+    void advance_and_bounce();
+    void regress();
+
+private:
+    int raw_advance();
+    double reflect(bool x, double oldc, double newc) const;
+    double reflect(double x, double c) const;
+    void set_reflect_point(const double oldx, const double oldy,
+                           double *newx, double *newy,
+                           bool blocked_x, bool blocked_y);
+};
+
+#endif