From 6fb664adaf2320436e53b53258f9d07ae57aed5d Mon Sep 17 00:00:00 2001
From: Matt Low <mattjlow94@gmail.com>
Date: Fri, 24 Jan 2020 13:16:21 +0400
Subject: [PATCH] Add player/model components + input/render systems

---
 .../asteroids/components/ModelComponent.java  | 10 ++++
 .../asteroids/components/PlayerComponent.java |  7 +++
 .../asteroids/systems/ModelRenderSystem.java  | 48 ++++++++++++++++
 .../asteroids/systems/PlayerInputSystem.java  | 55 +++++++++++++++++++
 4 files changed, 120 insertions(+)
 create mode 100644 core/src/com/me/asteroids/components/ModelComponent.java
 create mode 100644 core/src/com/me/asteroids/components/PlayerComponent.java
 create mode 100644 core/src/com/me/asteroids/systems/ModelRenderSystem.java
 create mode 100644 core/src/com/me/asteroids/systems/PlayerInputSystem.java

diff --git a/core/src/com/me/asteroids/components/ModelComponent.java b/core/src/com/me/asteroids/components/ModelComponent.java
new file mode 100644
index 0000000..57e4c69
--- /dev/null
+++ b/core/src/com/me/asteroids/components/ModelComponent.java
@@ -0,0 +1,10 @@
+package com.me.asteroids.components;
+
+import com.badlogic.gdx.math.Polygon;
+import com.me.common.ecs.Component;
+
+public class ModelComponent extends Component {
+
+    public Polygon model;
+
+}
diff --git a/core/src/com/me/asteroids/components/PlayerComponent.java b/core/src/com/me/asteroids/components/PlayerComponent.java
new file mode 100644
index 0000000..6d1ee62
--- /dev/null
+++ b/core/src/com/me/asteroids/components/PlayerComponent.java
@@ -0,0 +1,7 @@
+package com.me.asteroids.components;
+
+import com.me.common.ecs.Component;
+
+public class PlayerComponent extends Component {
+    // TODO: implement engine feature for tagging entities (as player, for e.g.)
+}
diff --git a/core/src/com/me/asteroids/systems/ModelRenderSystem.java b/core/src/com/me/asteroids/systems/ModelRenderSystem.java
new file mode 100644
index 0000000..b09d1a6
--- /dev/null
+++ b/core/src/com/me/asteroids/systems/ModelRenderSystem.java
@@ -0,0 +1,48 @@
+package com.me.asteroids.systems;
+
+import com.badlogic.gdx.graphics.Color;
+import com.badlogic.gdx.graphics.glutils.ShapeRenderer;
+import com.badlogic.gdx.math.Polygon;
+import com.badlogic.gdx.math.Vector2;
+import com.me.asteroids.Graphics;
+import com.me.asteroids.components.ModelComponent;
+import com.me.asteroids.components.PositionComponent;
+import com.me.common.ecs.Entity;
+import com.me.common.ecs.EntitySystem;
+
+public class ModelRenderSystem extends EntitySystem {
+
+    private ShapeRenderer renderer;
+
+    public ModelRenderSystem(Graphics graphics) {
+        super(ModelComponent.class, PositionComponent.class);
+        this.renderer = graphics.getShapeRenderer();
+    }
+
+    @Override
+    public void preProcessing() {
+        renderer.setColor(Color.WHITE);
+        renderer.begin(ShapeRenderer.ShapeType.Line);
+    }
+
+    @Override
+    public void processEntity(Entity entity, float dt) {
+        ModelComponent modelComponent = entity.getComponent(ModelComponent.class);
+        PositionComponent positionComponent = entity.getComponent(PositionComponent.class);
+
+        Polygon model = modelComponent.model;
+        Vector2 position = positionComponent.position;
+        float rotation = positionComponent.rotation;
+
+        model.setPosition(position.x, position.y);
+        model.setRotation(rotation - 90);
+
+        renderer.polygon(model.getTransformedVertices());
+    }
+
+    @Override
+    public void postProcessing() {
+        renderer.end();
+    }
+
+}
diff --git a/core/src/com/me/asteroids/systems/PlayerInputSystem.java b/core/src/com/me/asteroids/systems/PlayerInputSystem.java
new file mode 100644
index 0000000..dc597aa
--- /dev/null
+++ b/core/src/com/me/asteroids/systems/PlayerInputSystem.java
@@ -0,0 +1,55 @@
+package com.me.asteroids.systems;
+
+import com.badlogic.gdx.Gdx;
+import com.badlogic.gdx.Input;
+import com.badlogic.gdx.math.Vector2;
+import com.me.asteroids.Utils;
+import com.me.asteroids.components.AccelerationComponent;
+import com.me.asteroids.components.PlayerComponent;
+import com.me.asteroids.components.PositionComponent;
+import com.me.asteroids.components.VelocityComponent;
+import com.me.common.ecs.Entity;
+import com.me.common.ecs.EntitySystem;
+
+public class PlayerInputSystem extends EntitySystem {
+
+    public Vector2 tmp = new Vector2(0, 1);
+
+    public PlayerInputSystem() {
+        super(
+                PositionComponent.class,
+                VelocityComponent.class,
+                AccelerationComponent.class,
+                PlayerComponent.class
+        );
+    }
+
+    @Override
+    public void processEntity(Entity entity, float dt) {
+        PositionComponent positionComponent = entity.getComponent(PositionComponent.class);
+        VelocityComponent velocityComponent = entity.getComponent(VelocityComponent.class);
+        AccelerationComponent accelComponent = entity.getComponent(AccelerationComponent.class);
+
+        if (Gdx.input.isKeyPressed(Input.Keys.D)) {
+            positionComponent.rotation = Utils.rotate(positionComponent.rotation, -5);
+        }
+
+        if (Gdx.input.isKeyPressed(Input.Keys.A)) {
+            positionComponent.rotation = Utils.rotate(positionComponent.rotation, 5);
+        }
+
+        Vector2 acceleration = accelComponent.acceleration;
+        Vector2 velocity = velocityComponent.velocity;
+
+        if (Gdx.input.isKeyPressed(Input.Keys.W)) {
+            acceleration.set(Utils.setUnitVectorAngle(tmp, positionComponent.rotation).scl(500));
+        } else {
+            if (!velocity.isZero(1f)) {
+                acceleration.set(Utils.setUnitVectorAngleRad(tmp, velocity.angleRad()).scl(-100));
+            } else {
+                acceleration.set(0, 0);
+            }
+        }
+    }
+
+}