#11 Paralax movement fix

core/src/cz/nic/tablexia/screen/gamemenu/pages/GameMenuPage.java

@@ -39,7 +39,7 @@ public class GameMenuPage extends MenuPage implements ViewPager.ScrollListener {
             @Override
             public void clicked(InputEvent event, float x, float y) {
                 super.clicked(event, x, y);
-                GameMenuPage.this.game.performAction();
+                GameMenuPage.this.game.performAction(); // TODO launch game using events
             }
         });
 
@@ -67,9 +67,13 @@ public class GameMenuPage extends MenuPage implements ViewPager.ScrollListener {
     public void draw(Batch batch, float parentAlpha) {
         // Paralax layers
         Texture back = getScreen().getTexture(GameMenuAssets.getResourcePath(game, GameMenuAssets.GameMenuLayers.BACK));
-        int srcX = (int) (back.getWidth() * Math.max(scrollOffset / 2, 0) / getWidth());
-        int srcWidth = (int) (back.getWidth() * (getWidth() - (Math.min(scrollOffset, 0) + Math.max(0, scrollOffset))) / getWidth());
-        batch.draw(back, getX() - Math.min(scrollOffset, 0), getY(), getWidth() - Math.max(0, scrollOffset), getHeight(), srcX, 0, srcWidth, back.getHeight(), false, false);
+        float scrollHalf = (Math.abs(scrollOffset / 2) / getWidth()) * back.getWidth();
+        int srcX = (int) scrollHalf;
+        int srcWidth = (int) (back.getWidth() - (scrollHalf * 2));
+        float x = getX() + Math.abs(Math.min(scrollOffset, 0));
+        float width = getWidth() - Math.abs(scrollOffset);
+        
+        batch.draw(back, x, getY(), width, getHeight(), srcX, 0, srcWidth, back.getHeight(), false, false);
         batch.draw(getScreen().getTexture(GameMenuAssets.getResourcePath(game, GameMenuAssets.GameMenuLayers.MID)), getX(), getY(), getWidth(), getHeight());
         batch.draw(getScreen().getTexture(GameMenuAssets.getResourcePath(game, GameMenuAssets.GameMenuLayers.FORE)), getX() + (scrollOffset / 2), getY(), getWidth(), getHeight());