make hp bar hideable

src/de/miaurizius/jgame2d/entity/Entity.java

@@ -35,12 +35,14 @@ public class Entity {
     boolean attacking;
     public boolean alive = true;
     public boolean dying;
+    public boolean hpBarOn;
 
     // COUNTER
     public int spriteCounter;
     public int actionLock;
     public int invincibleCount;
     int dyingCount;
+    int hpBarCounter;
 
     // ATTRIBUTES
     public EntityType type;
@@ -106,16 +108,26 @@ public class Entity {
         ) {
 
             // MONSTER HP-BAR
-            if(this.type == EntityType.MONSTER) {
+            if(this.type == EntityType.MONSTER && hpBarOn) {
                 graphics2d.setColor(new Color(35, 35, 35));
                 graphics2d.fillRect(screenX-1, screenY-6, panel.tileSize+2, 12);
 
                 graphics2d.setColor(new Color(255, 0, 30));
                 graphics2d.fillRect(screenX, screenY-5, (int) ((double) panel.tileSize/maxLife)*life, 10);
+
+                hpBarCounter++;
+                if(hpBarCounter > 600) { //bar disappears after 10 seconds
+                    hpBarCounter = 0;
+                    hpBarOn = false;
+                }
             }
 
             // DRAW ENTITY
-            if(invincible) graphics2d.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 0.4f));
+            if(invincible) {
+                hpBarOn = true;
+                hpBarCounter = 0;
+                changeOpacity(graphics2d, 0.4f);
+            }
             if(dying) dyingAnimation(graphics2d);
             if(type == EntityType.PLAYER) { // only modify sprite render position for player because I dont know yet how monster attack sprite are gonna look
                 if(attacking) graphics2d.drawImage(parseSpriteATK(),
@@ -124,7 +136,7 @@ public class Entity {
                 else graphics2d.drawImage(parseSprite(), screenX, screenY, null);
             } else graphics2d.drawImage(parseSprite(), screenX, screenY, null);
 
-            graphics2d.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 1f));
+            changeOpacity(graphics2d, 1f);
         }
     }