CollisionResponse.h

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#pragma once
 
#include <vector>
 
#include <tdme/tdme.h>
#include <tdme/engine/physics/fwd-tdme.h>
#include <tdme/engine/physics/CollisionResponse_Entity.h>
#include <tdme/math/fwd-tdme.h>
#include <tdme/math/Math.h>
#include <tdme/math/Vector3.h>
#include <tdme/utilities/fwd-tdme.h>
#include <tdme/utilities/Console.h>
 
using std::vector;
 
using tdme::engine::physics::CollisionResponse;
using tdme::engine::physics::CollisionResponse_Entity;
using tdme::math::Math;
using tdme::math::Vector3;
using tdme::utilities::Console;
 
/**
 * Collision response
 * @author Andreas Drewke
 */
class tdme::engine::physics::CollisionResponse final
{
    friend class CollisionResponse_Entity;
    friend class CollisionDetection;
    friend class World;
 
private:
    static constexpr int32_t HITPOINT_COUNT { 30 };
    vector<CollisionResponse_Entity> entities;
    CollisionResponse_Entity* selectedEntity { nullptr };
    vector<Vector3> fallbackHitPointsVector;
 
public:
    /**
     * Public constructor
     */
    inline CollisionResponse() {
    }
 
    /**
     * Reset
     */
    inline void reset() {
        entities.clear();
        selectedEntity = nullptr;
    }
 
    /**
     * Adds a collision response entity
     * @param distance distance
     * @return Entity or null
     */
    inline CollisionResponse_Entity* addResponse(float distance) {
        entities.push_back(CollisionResponse_Entity());
        auto& entity = entities[entities.size() - 1];
        entity.distance = distance;
        // select entity with smallest penetration by default
        if (selectedEntity == nullptr || distance > selectedEntity->distance) {
            selectedEntity = &entity;
        }
        return &entity;
    }
 
    /**
     * @return entity count
     */
    inline int32_t getEntityCount() {
        return entities.size();
    }
 
    /**
     * @return selected entity
     */
    inline CollisionResponse_Entity* getSelectedEntity() {
        return selectedEntity;
    }
 
    /**
     * Selects entity at given index
     * @param idx idx
     * @return
     */
    inline CollisionResponse_Entity* getEntity(int32_t idx) {
        if (idx < 0 || idx >= entities.size()) return nullptr;
        return &entities[idx];
    }
 
    /**
     * Selects entity at given index
     * @param idx idx
     * @return
     */
    inline CollisionResponse* selectEntity(int32_t idx) {
        if (idx < 0 || idx >= entities.size()) return this;
        selectedEntity = &entities[idx];
        return this;
    }
 
    /**
     * @return if collision entity is selected
     */
    inline bool hasEntitySelected() {
        return selectedEntity != nullptr;
    }
 
    /**
     * @return collision distance or negative penetration
     */
    inline float getDistance() {
        if (selectedEntity == nullptr) return 0.0f;
        return selectedEntity->distance;
    }
 
    /**
     * @return if we have a penetration
     */
    inline bool hasPenetration() {
        if (selectedEntity == nullptr) return false;
        return selectedEntity->distance < -Math::EPSILON;
    }
 
    /**
     * @return penetration
     */
    inline float getPenetration() {
        if (selectedEntity == nullptr) return 0.0f;
        return -selectedEntity->distance;
    }
 
    /**
     * @return normal
     */
    inline const Vector3* getNormal() {
        if (selectedEntity == nullptr) return nullptr;
        return &selectedEntity->normal;
    }
 
    /**
     * @return get hit points
     */
    inline const vector<Vector3>& getHitPoints() {
        if (selectedEntity == nullptr) return fallbackHitPointsVector;
        return selectedEntity->hitPoints;
    }
 
    /**
     * @return hit point count
     */
    inline int32_t getHitPointCount() {
        if (selectedEntity == nullptr) return 0;
        return selectedEntity->hitPoints.size();
    }
 
    /**
     * Get hit point of given index
     * @param i i
     * @return hit point for given hit points index
     */
    inline Vector3* getHitPoint(int32_t idx) {
        if (selectedEntity == nullptr) return nullptr;
        if (idx < 0 || idx >= selectedEntity->hitPoints.size()) return nullptr;
        return &selectedEntity->hitPoints[idx];
    }
 
};