112 lines
3.3 KiB
C++
112 lines
3.3 KiB
C++
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#pragma once
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#include "Common.h"
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#include "Alarm.h"
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#include "State.h"
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#include <bitset>
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#include <cstdint>
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#include <SDL2/SDL_events.h>
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#include <SDL2/SDL_render.h>
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namespace NGame {
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class TEntity {
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public:
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using TId = std::uint32_t;
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using TCollisionGroup = std::bitset<32>;
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TEntity(TEntity::TId id);
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virtual ~TEntity() = default;
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void Tick(std::uint32_t delta);
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virtual void Input(SDL_Event* event);
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virtual void Update(std::uint32_t delta);
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virtual void Alarm(TAlarm::TId id);
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virtual void Draw() const;
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void SetPosition(Vec2i value);
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void SetSize(Vec2i value);
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const Vec2i& Position() const;
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const Vec2i& Size() const;
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const Vec2i& AckPosition() const;
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const Vec2i& AckSize() const;
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bool HasChanges() const;
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void AckChanges();
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TCollisionGroup CollisionGroup() const;
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void SetCollisionGroup(TCollisionGroup group);
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static float MovementPerTick(std::uint32_t delta, float speed);
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static Vec2f MovementPerTick(std::uint32_t delta, Vec2f speed);
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std::pair<Vec2i::TType, float> NextMovement(float speed, float fraction);
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template<typename UnaryPredicate>
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std::pair<Vec2f, std::pair<bool, bool>> MoveWithCondition(Vec2f speed, Vec2f fraction, UnaryPredicate p) {
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auto distanceX = NextMovement(speed.X, fraction.X);
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auto distanceY = NextMovement(speed.Y, fraction.Y);
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auto directionFlags = std::make_pair(true, true);
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Vec2f resultFraction(distanceX.second, distanceY.second);
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Vec2i resultDistance(distanceX.first, distanceY.first);
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Vec2i newPosition = Position() + resultDistance;
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if (p(newPosition)) {
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// There is no problem with the new position, we are done
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SetPosition(newPosition);
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} else {
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// There might be some problem, move 1px at a time
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Vec2i direction(1, 1);
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if (resultDistance.X < 0) {
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direction.X = -1;
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}
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if (resultDistance.Y < 0) {
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direction.Y = -1;
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}
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resultDistance.X = abs(resultDistance.X);
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resultDistance.Y = abs(resultDistance.Y);
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for (Vec2i::TType i = 0; i < resultDistance.X; ++i) {
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newPosition = Position() + Vec2i(direction.X, 0);
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if (!p(newPosition)) {
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resultFraction.X = 0;
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directionFlags.first = false;
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break;
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}
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SetPosition(newPosition);
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}
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for (Vec2i::TType i = 0; i < resultDistance.Y; ++i) {
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newPosition = Position() + Vec2i(0, direction.Y);
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if (!p(newPosition)) {
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resultFraction.Y = 0;
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directionFlags.second = false;
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break;
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}
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SetPosition(newPosition);
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}
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}
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return std::make_pair(resultFraction, directionFlags);
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}
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TEntity::TId Id() const;
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void Remove();
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bool IsRemoved() const;
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bool IsPersistent() const;
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protected:
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TAlarm Alarm_;
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private:
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bool IsPersistent_ = false;
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bool IsRemoved_ = false;
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TEntity::TId Id_;
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TCollisionGroup CollisionGroup_;
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Vec2i Position_;
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Vec2i Size_;
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Vec2i AckPosition_;
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Vec2i AckSize_;
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};
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} // namespace NGame
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