Implemented oval path

2 files changed, 60 insertions, 0 deletions

diff --git a/src/crepe/api/AI.cpp b/src/crepe/api/AI.cpp
index 49f6b92..00e5b37 100644
--- a/src/crepe/api/AI.cpp
+++ b/src/crepe/api/AI.cpp
@@ -27,4 +27,50 @@ void AI::make_circle_path(float radius, vec2 center, float start_angle, bool clo
 	}
 }
 
+void AI::make_oval_path(float radius_x, float radius_y, vec2 center, float start_angle,
+						bool clockwise, float rotation) {
+	float max_radius = std::max(radius_x, radius_y);
+	// The step size is determined by the radius (step size is in radians)
+	float step = 400.0f / max_radius;
+	// Force at least 16 steps (in case of a small radius)
+	if (step > 2 * M_PI / 16) {
+		step = 2 * M_PI / 16;
+	}
+	// The path node distance is determined by the step size and the radius
+	path_node_distance = max_radius * step * 0.75f;
+
+	auto rotate_point = [rotation](vec2 point, vec2 center) {
+		float s = sin(rotation);
+		float c = cos(rotation);
+
+		// Translate point back to origin
+		point.x -= center.x;
+		point.y -= center.y;
+
+		// Rotate point
+		float xnew = point.x * c - point.y * s;
+		float ynew = point.x * s + point.y * c;
+
+		// Translate point back
+		point.x = xnew + center.x;
+		point.y = ynew + center.y;
+
+		return point;
+	};
+
+	if (clockwise) {
+		for (float i = start_angle; i < 2 * M_PI + start_angle; i += step) {
+			vec2 point = {static_cast<float>(center.x + radius_x * cos(i)),
+						  static_cast<float>(center.y + radius_y * sin(i))};
+			path.push_back(rotate_point(point, center));
+		}
+	} else {
+		for (float i = start_angle; i > start_angle - 2 * M_PI; i -= step) {
+			vec2 point = {static_cast<float>(center.x + radius_x * cos(i)),
+						  static_cast<float>(center.y + radius_y * sin(i))};
+			path.push_back(rotate_point(point, center));
+		}
+	}
+}
+
 } // namespace crepe
diff --git a/src/crepe/api/AI.h b/src/crepe/api/AI.h
index 0dccd5f..c95924d 100644
--- a/src/crepe/api/AI.h
+++ b/src/crepe/api/AI.h
@@ -81,6 +81,20 @@ public:
 	 */
 	void make_circle_path(float radius, vec2 center = {0, 0}, float start_angle = 0,
 						  bool clockwise = true);
+	/**
+	 * \brief Make an oval path (for the path following behavior)
+	 *
+	 * \note The path is not relative to the entity's position (it is an absolute path)
+	 *
+	 * \param radius_x The x radius of the oval (in game units)
+	 * \param radius_y The y radius of the oval (in game units)
+	 * \param center The center of the oval (in game units)
+	 * \param start_angle The start angle of the oval (in radians)
+	 * \param clockwise The direction of the oval
+	 * \param rotation The rotation of the oval (in radians)
+	 */
+	void make_oval_path(float radius_x, float radius_y, vec2 center = {0, 0},
+						float start_angle = 0, bool clockwise = true, float rotation = 0);
 
 public:
 	//! The maximum force that can be applied to the entity (higher values will make the entity adjust faster)