Simple background and camera

1 files changed, 62 insertions, 2 deletions

diff --git a/core/src/main/java/org/snoopdesigns/endless/EndlessGame.java b/core/src/main/java/org/snoopdesigns/endless/EndlessGame.java
index 53884dd..1453a6e 100644
--- a/core/src/main/java/org/snoopdesigns/endless/EndlessGame.java
+++ b/core/src/main/java/org/snoopdesigns/endless/EndlessGame.java
@@ -1,32 +1,92 @@
 package org.snoopdesigns.endless;
 
 import com.badlogic.gdx.ApplicationAdapter;
+import com.badlogic.gdx.Gdx;
+import com.badlogic.gdx.Input;
+import com.badlogic.gdx.graphics.OrthographicCamera;
 import com.badlogic.gdx.graphics.Texture;
+import com.badlogic.gdx.graphics.g2d.Sprite;
 import com.badlogic.gdx.graphics.g2d.SpriteBatch;
+import com.badlogic.gdx.math.MathUtils;
 import com.badlogic.gdx.utils.ScreenUtils;
 
 public class EndlessGame extends ApplicationAdapter {
 
+    private static final int WORLD_WIDTH = 100;
+    private static final int WORLD_HEIGHT = 100;
+
+    private static final int DEFAULT_VIEWPORT_WIDTH = 30;
+    private static final int DEFAULT_VIEWPORT_HEIGHT = 30;
+
+    private OrthographicCamera cam;
     private SpriteBatch batch;
+    private Sprite imageSprite;
     private Texture image;
 
     @Override
     public void create() {
         batch = new SpriteBatch();
-        image = new Texture("libgdx.png");
+        image = new Texture("sc_map.png");
+        imageSprite = new Sprite(image);
+        imageSprite.setPosition(0, 0);
+        imageSprite.setSize(WORLD_WIDTH, WORLD_HEIGHT);
+
+        float graphicsWidth = Gdx.graphics.getWidth();
+        float graphicsHeight = Gdx.graphics.getHeight();
+
+        cam = new OrthographicCamera(
+                DEFAULT_VIEWPORT_WIDTH,
+                DEFAULT_VIEWPORT_HEIGHT * (graphicsHeight / graphicsWidth));
+        cam.position.set(cam.viewportWidth / 2f, cam.viewportHeight / 2f, 0);
+        cam.update();
     }
 
     @Override
     public void render() {
+        handleInput();
+        cam.update();
+        batch.setProjectionMatrix(cam.combined);
+
         ScreenUtils.clear(0.15f, 0.15f, 0.2f, 1f);
+
         batch.begin();
-        batch.draw(image, 140, 210);
+        imageSprite.draw(batch);
         batch.end();
     }
 
     @Override
     public void dispose() {
+        imageSprite.getTexture().dispose();
         batch.dispose();
         image.dispose();
     }
+
+    private void handleInput() {
+        if (Gdx.input.isKeyPressed(Input.Keys.A)) {
+            cam.zoom += 0.02;
+        }
+        if (Gdx.input.isKeyPressed(Input.Keys.Q)) {
+            cam.zoom -= 0.02;
+        }
+        if (Gdx.input.isKeyPressed(Input.Keys.LEFT)) {
+            cam.translate(-3, 0, 0);
+        }
+        if (Gdx.input.isKeyPressed(Input.Keys.RIGHT)) {
+            cam.translate(3, 0, 0);
+        }
+        if (Gdx.input.isKeyPressed(Input.Keys.DOWN)) {
+            cam.translate(0, -3, 0);
+        }
+        if (Gdx.input.isKeyPressed(Input.Keys.UP)) {
+            cam.translate(0, 3, 0);
+        }
+
+        cam.zoom = MathUtils.clamp(cam.zoom, 0.1f, 100 / cam.viewportWidth);
+
+        float effectiveViewportWidth = cam.viewportWidth * cam.zoom;
+        float effectiveViewportHeight = cam.viewportHeight * cam.zoom;
+
+        cam.position.x = MathUtils.clamp(cam.position.x, effectiveViewportWidth / 2f, 100 - effectiveViewportWidth / 2f);
+        cam.position.y = MathUtils.clamp(cam.position.y, effectiveViewportHeight / 2f, 100 - effectiveViewportHeight / 2f);
+    }
 }