1 files changed, 54 insertions, 0 deletions
diff --git a/include/mbgl/text/rotation_range.hpp b/include/mbgl/text/rotation_range.hpp
new file mode 100644
index 0000000000..4968fda164
--- /dev/null
+++ b/include/mbgl/text/rotation_range.hpp
@@ -0,0 +1,54 @@
+#ifndef MBGL_TEXT_ROTATION_RANGE
+#define MBGL_TEXT_ROTATION_RANGE
+
+#include <mbgl/util/math.hpp>
+#include <mbgl/text/types.hpp>
+
+#include <vector>
+#include <cassert>
+
+namespace mbgl {
+
+/*
+ * Combine an array of collision ranges to form a continuous
+ * range that includes 0. Collisions within the ignoreRange are ignored
+ */
+CollisionRange mergeCollisions(const CollisionList &collisions,
+                               PlacementRange ignoreRange);
+
+/*
+ *  Calculate collision ranges for two rotating boxes.e
+ */
+CollisionList rotatingRotatingCollisions(const CollisionRect &a,
+                                         const CollisionRect &b,
+                                         const CollisionAnchor &anchorToAnchor);
+
+/*
+ * Return the intersection points of a circle and a line segment;
+ */
+void circleEdgeCollisions(std::back_insert_iterator<CollisionAngles> angles,
+                          const CollisionPoint &corner, float radius,
+                          const CollisionPoint &p1, const CollisionPoint &p2);
+
+/*
+ *  Calculate the ranges for which the corner,
+ *  rotatated around the anchor, is within the box;
+ */
+void cornerBoxCollisions(std::back_insert_iterator<CollisionList> collisions,
+                         const CollisionPoint &corner,
+                         const CollisionCorners &boxCorners, bool flip = false);
+
+/*
+ *  Calculate collision ranges for a rotating box and a fixed box;
+ */
+CollisionList rotatingFixedCollisions(const CollisionRect &rotating,
+                                      const CollisionRect &fixed);
+
+/*
+ * Calculate the range a box conflicts with a second box
+ */
+CollisionRange rotationRange(const GlyphBox &inserting,
+                             const PlacementBox &blocker, float scale);
+}
+
+#endif