start porting CollisionTile and CollisionFeature

1 files changed, 62 insertions, 0 deletions

diff --git a/src/mbgl/text/collision_feature.hpp b/src/mbgl/text/collision_feature.hpp
new file mode 100644
index 0000000000..a16f58c8ed
--- /dev/null
+++ b/src/mbgl/text/collision_feature.hpp
@@ -0,0 +1,62 @@
+#ifndef MBGL_TEXT_COLLISION_FEATURE
+#define MBGL_TEXT_COLLISION_FEATURE
+
+#include <mbgl/util/vec.hpp>
+#include <mbgl/geometry/anchor.hpp>
+#include <mbgl/text/shaping.hpp>
+#include <vector>
+
+namespace mbgl {
+    class CollisionBox {
+        public:
+            explicit CollisionBox(const Anchor &_anchor, float _x1, float _y1, float _x2, float _y2, float _maxScale) :
+                anchor(_anchor), x1(_x1), y1(_y1), x2(_x2), y2(_y2), maxScale(_maxScale) {}
+
+            // the box is centered around the anchor point
+            const Anchor anchor;
+
+            // distances to the edges from the anchor
+            const float x1;
+            const float y1;
+            const float x2;
+            const float y2;
+
+            // the box is only valid for scales < maxScale.
+            // The box does not block other boxes at scales >= maxScale;
+            const float maxScale;
+
+            // the scale at which the label can first be shown
+            float placementScale = 0.0f;
+    };
+
+    class CollisionFeature {
+        public:
+            // for text
+            inline explicit CollisionFeature(const std::vector<Coordinate> &line, const Anchor &anchor,
+                    const Shaping &shapedText,
+                    const float boxScale, const float padding, const bool alongLine)
+                : CollisionFeature(line, anchor,
+                        shapedText.top, shapedText.bottom, shapedText.left, shapedText.right,
+                        boxScale, padding, alongLine) {}
+
+            // for icons
+            inline explicit CollisionFeature(const std::vector<Coordinate> &line, const Anchor &anchor,
+                    const PositionedIcon &shapedIcon,
+                    const float boxScale, const float padding, const bool alongLine)
+                : CollisionFeature(line, anchor,
+                        shapedIcon.top, shapedIcon.bottom, shapedIcon.left, shapedIcon.right,
+                        boxScale, padding, alongLine) {}
+
+            explicit CollisionFeature(const std::vector<Coordinate> &line, const Anchor &anchor,
+                    const float top, const float bottom, const float left, const float right,
+                    const float boxScale, const float padding, const bool alongLine);
+
+
+            std::vector<CollisionBox> boxes;
+
+        private:
+            void bboxifyLabel(const std::vector<Coordinate> &line, const Anchor &anchor, const float length, const float height);
+    };
+}
+
+#endif