FlowField.h

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#pragma once
 
#include <limits>
#include <vector>
 
namespace eve::map {
 
class FlowField {
public:
    static constexpr float kUnreachable = std::numeric_limits<float>::infinity();
 
    void clear();
    void resize(int width, int height);
    int getWidth() const { return width_; }
    int getHeight() const { return height_; }
 
    int getGoalX() const { return goalX_; }
    int getGoalY() const { return goalY_; }
    void setGoal(int x, int y);
 
    float costAt(int x, int y) const;
    void setCost(int x, int y, float cost);
 
    int nextX(int x, int y) const;
    int nextY(int x, int y) const;
    void setNext(int x, int y, int nx, int ny);
 
    bool isReachable(int x, int y) const;
 
private:
    bool inBounds(int x, int y) const;
    int index(int x, int y) const { return y * width_ + x; }
 
    int width_ = 0;
    int height_ = 0;
    int goalX_ = 0;
    int goalY_ = 0;
    std::vector<float> cost_;
    std::vector<int> nextX_;
    std::vector<int> nextY_;
};
 
}  // namespace eve::map