verysecrethero
61 lines
2.6 KiB
C++
61 lines
2.6 KiB
C++
#include "Systems/DamageIndicatorSystem.h"
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DamageIndicatorSystem::DamageIndicatorSystem(World* m_World, EventBroker* eventBroker)
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: System(m_World, eventBroker)
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{
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EVENT_SUBSCRIBE_MEMBER(m_DamageTakenFromPlayer, &DamageIndicatorSystem::OnPlayerDamageTaken);
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//current camera
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EVENT_SUBSCRIBE_MEMBER(m_ESetCamera, &DamageIndicatorSystem::OnSetCamera);
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}
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bool DamageIndicatorSystem::OnPlayerDamageTaken(Events::PlayerDamage& e)
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{
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if (m_CurrentCamera == -1) {
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return false;
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}
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//grab players direction
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auto playerOrientation = glm::quat((glm::vec3)e.Player["Transform"]["Orientation"]);
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//get the position vectors, but ignore the y-height
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auto enemyPosition = (glm::vec3) e.PlayerShooter["Transform"]["Position"];
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auto playerPosition = (glm::vec3) e.Player["Transform"]["Position"];
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enemyPosition.y = 0.0f;
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playerPosition.y = 0.0f;
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//calculate the enemy to player vector
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auto enemyPlayerVector = glm::normalize((glm::vec3) playerPosition - enemyPosition);
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//get angle from players current rotation, this angle is how much you rotate around the y-axis
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auto playerAngle = glm::angle(playerOrientation);
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auto playerRotationVector = glm::normalize(glm::rotateY(glm::vec3(0, 0, 1), playerAngle));
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//dot product of players direction-vector and enemys-to-playervector will give the cos of the angle between the vectors
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auto playerRotationDot = glm::dot(playerRotationVector, enemyPlayerVector);
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//to get the angle between the vectors just do cos-inverse
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auto angleBetweenVectors = glm::acos(playerRotationDot);
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//rotate the direction-vector 90 degrees to get the players side-vector
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auto playerSideVector = glm::normalize(glm::rotateY(glm::vec3(0, 0, 1), playerAngle + 1.57f));
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//dot of sidevector positive = enemy is on the right side, dot sidevector negative = left side
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auto playerSideVectorDot = glm::dot(playerSideVector, enemyPlayerVector);
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if (playerSideVectorDot < 0) {
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angleBetweenVectors = -angleBetweenVectors;
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}
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//load & set the "2d" sprite
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auto entityFile = ResourceManager::Load<EntityFile>("Schema/Entities/SpriteTestTemporary.xml");
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EntityFileParser parser(entityFile);
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EntityID spriteID = parser.MergeEntities(m_World);
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m_World->SetParent(spriteID, m_CurrentCamera);
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auto spriteWrapper = EntityWrapper(m_World, spriteID);
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//simply set the rotation z-wise to the angleBetweenVectors
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spriteWrapper["Transform"]["Orientation"] = glm::vec3(0, 0, angleBetweenVectors);
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return true;
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}
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bool DamageIndicatorSystem::OnSetCamera(const Events::SetCamera& e) {
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m_CurrentCamera = e.CameraEntity.ID;
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return true;
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} |