refactor entity behavior and enhance monster chasing logic

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

@@ -14,6 +14,7 @@ import java.awt.image.BufferedImage;
 import java.io.FileInputStream;
 import java.io.IOException;
 import java.util.ArrayList;
+import java.util.Random;
 import java.util.logging.Level;
 
 public class Entity {
@@ -47,6 +48,7 @@ public class Entity {
     public int spriteCount;
     public int actionLock;
     public int invincibleCount;
+    public int shotAvailableCount;
     int dyingCount;
     int hpBarCount;
     int knockbackCount;
@@ -339,6 +341,21 @@ public class Entity {
     public int getRow() {
         return (worldY + solidArea.y) / panel.tileSize;
     }
+    public int dX(Entity target) {
+        return Math.abs(worldX - target.worldX);
+    }
+    public int dY(Entity target) {
+        return Math.abs(worldY - target.worldX);
+    }
+    public int dTile(Entity target) {
+        return (dX(target) + dY(target)) / panel.tileSize;
+    }
+    public int getGoalCol(Entity target) {
+        return (target.worldX+target.solidArea.x)/panel.tileSize;
+    }
+    public int getGoalRow(Entity target) {
+        return (target.worldY+target.solidArea.y)/panel.tileSize;
+    }
 
     // SETTING THINGS UP
     BufferedImage parseSprite() {
@@ -417,7 +434,10 @@ public class Entity {
             }
         } else onPath = false;
     }
-    public void followPlayer(int goalCol, int goalRow) {
+    public void followPlayer() {
+        int goalCol = panel.player.getCol();
+        int goalRow = panel.player.getRow();
+
         int startCol = (worldX + solidArea.x) / panel.tileSize;
         int startRow = (worldY + solidArea.y) / panel.tileSize;
 
@@ -458,5 +478,37 @@ public class Entity {
             }
         }
     }
+    public void checkStopChasing(Entity target, int distance, int rate) {
+        if(dTile(target) > distance) if(new Random().nextInt(rate) == 0) onPath = false;
+    }
+    public void checkStartChasing(Entity target, int distance, int rate) {
+        if(dTile(target) < distance) if(new Random().nextInt(rate) == 0) onPath = true;
+    }
+    public void checkShooting(int rate, int shotInterval) {
+        if(new Random().nextInt(rate) == 0 && projectile.alive == false && shotAvailableCount == shotInterval) {
+            projectile.set(worldX, worldY, direction, true, this);
+
+            // CHECK VACANCY
+            for(int ii = 0; ii < panel.projectileList.size(); ii++) {
+                if(panel.projectileList.get(ii) == null) {
+                    panel.projectileList.set(ii, projectile);
+                    break;
+                }
+            }
+            shotAvailableCount = 0;
+        }
+    }
+    public void setRandomDirection() {
+        actionLock++;
+        if(actionLock == 120) { //lock action for x frames
+            Random rand = new Random();
+            int i = rand.nextInt(100)+1; //Generate number between 1 and 100
+            if(i <= 25) direction = Direction.UP;
+            if(i > 25 && i <= 50) direction = Direction.DOWN;
+            if(i > 50 && i <= 75) direction = Direction.LEFT;
+            if(i > 75) direction = Direction.RIGHT;
+            actionLock = 0;
+        }
+    }
 
 }