Create coord-circle.cc containing circle_def.

circle_def unifies the shapes that a radius_iterator can iterate
over. It's meant to replace bounds_func in losparam.h and eventually
provide a base for radius_iterator.

1 files changed, 76 insertions, 0 deletions

diff --git a/crawl-ref/source/coord-circle.h b/crawl-ref/source/coord-circle.h
new file mode 100644
index 0000000000..172e2600b6
--- /dev/null
+++ b/crawl-ref/source/coord-circle.h
@@ -0,0 +1,76 @@
+#ifndef COORD_CIRCLE_H
+#define COORD_CIRCLE_H
+
+#include "coordit.h"
+
+enum shape_type
+{
+    SH_SQUARE,     // square around an origin
+    SH_CIRCLE      // circle around an origin
+};
+
+enum circle_type
+{
+    C_SQUARE,
+    C_CIRCLE,
+    C_POINTY,
+    C_ROUND
+};
+
+class rect_def
+{
+    coord_def min;
+    coord_def max;
+
+public:
+    rect_def() {}
+    rect_def(const coord_def &min_, const coord_def &max_)
+        : min(min_), max(max_) {}
+
+    rectangle_iterator iter() const;
+};
+
+class circle_iterator;
+class circle_def
+{
+    bool los_radius;
+    shape_type shape;
+
+    coord_def origin;
+    int radius;
+    int radius_sq;
+    rect_def bbox;
+
+public:
+    // Circle around (0,0) with radius that tracks global LOS radius.
+    circle_def();
+    // Circle around (0,0) of specified shape and size.
+    explicit circle_def(int param, circle_type ctype = C_SQUARE);
+    // Circle around given origin of specified shape and size.
+    circle_def(const coord_def &origin_, int param, circle_type ctype = C_SQUARE);
+
+    bool contains(const coord_def &p) const;
+    const rect_def& get_bbox() const;
+
+    circle_iterator iter() const;
+
+private:
+    void init(int param, circle_type ctype);
+};
+
+class circle_iterator
+{
+    const circle_def &circle;
+    rectangle_iterator iter;
+
+public:
+    circle_iterator(const circle_def &circle_);
+
+    operator bool() const;
+    coord_def operator*() const;
+
+    void operator++();
+    void operator++(int);
+};
+
+#endif