148 lines
3.4 KiB
C++
148 lines
3.4 KiB
C++
#include "path_sprite.h"
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#include <cmath> // for abs
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#include <stdlib.h> // for abs
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#include <functional> // for function
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#include <utility> // for move
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// Devuelve un vector con los puntos que conforman la ruta
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std::vector<SDL_Point> createPath(int start, int end, PathType type, int fixed_pos, int steps, const std::function<double(double)> &easingFunction)
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{
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std::vector<SDL_Point> v;
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v.reserve(steps);
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for (int i = 0; i < steps; ++i)
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{
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double t = static_cast<double>(i) / (steps - 1);
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double value = start + (end - start) * easingFunction(t);
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if (start > 0 && end < 0)
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{
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value = start - std::abs(end - start) * easingFunction(t);
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}
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else if (start < 0 && end > 0)
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{
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value = start + std::abs(end - start) * easingFunction(t);
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}
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switch (type)
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{
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case PathType::HORIZONTAL:
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v.emplace_back(SDL_Point{static_cast<int>(value), fixed_pos});
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break;
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case PathType::VERTICAL:
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v.emplace_back(SDL_Point{fixed_pos, static_cast<int>(value)});
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break;
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default:
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break;
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}
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}
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return v;
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}
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// Actualiza la posición y comprueba si ha llegado a su destino
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void PathSprite::update()
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{
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if (enabled_)
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{
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moveThroughCurrentPath();
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goToNextPathOrDie();
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}
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}
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// Añade un recorrido
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void PathSprite::addPath(Path path, bool centered)
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{
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PathCentered path_centered = PathCentered::NONE;
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if (centered)
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path_centered = (path.spots.back().x == path.spots.front().x) ? PathCentered::ON_X : PathCentered::ON_Y;
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switch (path_centered)
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{
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case PathCentered::ON_X:
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{
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const int x = path.spots.back().x - pos_.w / 2;
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for (auto &spot : path.spots)
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spot.x = x;
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paths_.emplace_back(path);
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break;
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}
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case PathCentered::ON_Y:
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{
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const int y = path.spots.back().y - pos_.h / 2;
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for (auto &spot : path.spots)
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spot.y = y;
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paths_.emplace_back(path);
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break;
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}
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default:
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paths_.emplace_back(path);
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break;
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}
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}
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// Añade un recorrido
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void PathSprite::addPath(int start, int end, PathType type, int fixed_pos, int steps, const std::function<double(double)> &easingFunction, int waiting_counter)
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{
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paths_.emplace_back(createPath(start, end, type, fixed_pos, steps, easingFunction), waiting_counter);
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}
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// Añade un recorrido
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void PathSprite::addPath(std::vector<SDL_Point> spots, int waiting_counter)
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{
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paths_.emplace_back(std::move(spots), waiting_counter);
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}
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// Habilita el objeto
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void PathSprite::enable()
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{
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enabled_ = true;
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}
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// Coloca el sprite en los diferentes puntos del recorrido
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void PathSprite::moveThroughCurrentPath()
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{
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auto &path = paths_.at(current_path_);
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// Establece la posición
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const auto &p = path.spots.at(path.counter);
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setPosition(p);
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// Comprobar si ha terminado el recorrido
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if (!path.on_destination)
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{
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++path.counter;
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if (path.counter >= static_cast<int>(path.spots.size()))
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{
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path.on_destination = true;
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path.counter = static_cast<int>(path.spots.size()) - 1;
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}
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}
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// Comprobar si ha terminado la espera
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if (path.on_destination)
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{
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if (path.waiting_counter == 0)
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path.finished = true;
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else
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--path.waiting_counter;
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}
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}
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// Cambia de recorrido o finaliza
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void PathSprite::goToNextPathOrDie()
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{
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// Comprueba si ha terminado el recorrdo actual
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if (paths_.at(current_path_).finished)
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++current_path_;
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// Comprueba si quedan mas recorridos
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if (current_path_ >= static_cast<int>(paths_.size()))
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enabled_ = false;
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}
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// Indica si ha terminado todos los recorridos
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bool PathSprite::hasFinished()
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{
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return !enabled_;
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} |