added player system; player moves left and right

1 files changed, 75 insertions, 0 deletions

diff --git a/src/player.cpp b/src/player.cpp
new file mode 100644
index 0000000..22bd0ef
--- /dev/null
+++ b/src/player.cpp
@@ -0,0 +1,75 @@
+/**
+ * @file player.cpp
+ * Manages player input.
+ *
+ * Copyright (C) 2019 Clyne Sullivan
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "player.hpp"
+
+#include "components/Velocity.hpp"
+
+void PlayerSystem::configure([[maybe_unused]] entityx::EntityManager& entities,
+    entityx::EventManager& events)
+{
+	events.subscribe<entityx::ComponentAddedEvent<Player>>(*this);
+	events.subscribe<entityx::ComponentRemovedEvent<Player>>(*this);
+	events.subscribe<KeyUpEvent>(*this);
+	events.subscribe<KeyDownEvent>(*this);
+}
+
+void PlayerSystem::update([[maybe_unused]] entityx::EntityManager& entites,
+    [[maybe_unused]] entityx::EventManager& events,
+    [[maybe_unused]] entityx::TimeDelta dt)
+{
+}
+
+void PlayerSystem::receive(const entityx::ComponentAddedEvent<Player>& cae)
+{
+	player = cae.entity;
+}
+
+void PlayerSystem::receive(const entityx::ComponentRemovedEvent<Player>& cre)
+{
+	if (player == cre.entity)
+		player.invalidate();
+}
+
+void PlayerSystem::receive(const KeyDownEvent& kue)
+{
+	if (player.valid()) {
+		if (kue.sym == SDLK_a) {
+			if (auto vel = player.component<Velocity>(); vel)
+				vel->x += GROUND_VELOCITY;
+		} else if (kue.sym == SDLK_d) {
+			if (auto vel = player.component<Velocity>(); vel)
+				vel->x -= GROUND_VELOCITY;
+		}
+	}
+}
+
+void PlayerSystem::receive(const KeyUpEvent& kue)
+{
+	if (player.valid()) {
+		if (kue.sym == SDLK_a) {
+			if (auto vel = player.component<Velocity>(); vel)
+				vel->x -= GROUND_VELOCITY;
+		} else if (kue.sym == SDLK_d) {
+			if (auto vel = player.component<Velocity>(); vel)
+				vel->x += GROUND_VELOCITY;
+		}
+	}
+}