From 686f7442c8c7442019158bf337866e17c97a8d6a Mon Sep 17 00:00:00 2001
From: agreiner <andreasgreiner@online.de>
Date: Mon, 7 Jun 2021 15:30:36 +0200
Subject: [PATCH] Praktikum 9

---
 .../graphics/moveable/FollowerBall.java       | 79 +++++++++++++++++++
 .../graphics/moveable/RandomBall.java         | 57 +++++++++++++
 2 files changed, 136 insertions(+)
 create mode 100644 SuperPangWorld/src/de/thdeg/greiner/superpangworld/graphics/moveable/FollowerBall.java
 create mode 100644 SuperPangWorld/src/de/thdeg/greiner/superpangworld/graphics/moveable/RandomBall.java

diff --git a/SuperPangWorld/src/de/thdeg/greiner/superpangworld/graphics/moveable/FollowerBall.java b/SuperPangWorld/src/de/thdeg/greiner/superpangworld/graphics/moveable/FollowerBall.java
new file mode 100644
index 0000000..504bb1c
--- /dev/null
+++ b/SuperPangWorld/src/de/thdeg/greiner/superpangworld/graphics/moveable/FollowerBall.java
@@ -0,0 +1,79 @@
+package de.thdeg.berl.ufofight.graphics.movingobjects;
+
+import de.thdeg.berl.ufofight.gameview.GameView;
+import de.thdeg.berl.ufofight.graphics.base.GameObject;
+import de.thdeg.berl.ufofight.graphics.base.MovingGameObject;
+import de.thdeg.berl.ufofight.graphics.base.Position;
+
+import java.awt.*;
+
+/** This ball follows another ball. */
+public class FollowerBall extends GameObject implements MovingGameObject {
+
+    private enum Status {FOLLOW, CENTER, HIDE}
+
+    private final RandomBall followMe;
+    private Position targetPosition;
+    private Status status;
+
+    /**
+     * Creates the GameObject with the GameView to be displayed on.
+     *
+     * @param gameView Window to show the GameObject on.
+     * @param followMe The RandomBall to follow.
+     */
+    public FollowerBall(GameView gameView, RandomBall followMe) {
+        super(gameView);
+        this.status = Status.CENTER;
+        this.followMe = followMe;
+        this.position = new Position(GameView.WIDTH, GameView.HEIGHT);
+        this.size = 50;
+        this.speedInPixel = 2;
+
+    }
+
+    @Override
+    public void updatePosition() {
+        if (gameView.timerExpired("Status", "FollowerBall")) {
+            gameView.setTimer("Status", "FollowerBall", 3000);
+            switch (status) {
+                case HIDE:
+                    status = Status.CENTER;
+                    break;
+                case CENTER:
+                    status = Status.FOLLOW;
+                    break;
+                case FOLLOW:
+                    status = Status.HIDE;
+                    break;
+            }
+        }
+        if (status == Status.FOLLOW) {
+            targetPosition = followMe.getPosition().clone();
+            targetPosition.y += 25;
+        } else if (status == Status.CENTER) {
+            targetPosition = new Position(GameView.WIDTH / 2d, GameView.HEIGHT / 2d);
+        }
+        if (status != Status.HIDE) {
+            double distance = position.distance(targetPosition);
+            if (distance >= speedInPixel) {
+                position.right((targetPosition.x - position.x) / distance * speedInPixel);
+                position.down((targetPosition.y - position.y) / distance * speedInPixel);
+            }
+        }
+    }
+
+    @Override
+    protected void updateStatus() {
+
+    }
+
+    @Override
+    public void addToCanvas() {
+        if (status == Status.HIDE) {
+            gameView.addOvalToCanvas(position.x, position.y, size, size, 2, true, Color.WHITE);
+        } else {
+            gameView.addOvalToCanvas(position.x, position.y, size, size, 2, true, Color.GREEN);
+        }
+    }
+}
diff --git a/SuperPangWorld/src/de/thdeg/greiner/superpangworld/graphics/moveable/RandomBall.java b/SuperPangWorld/src/de/thdeg/greiner/superpangworld/graphics/moveable/RandomBall.java
new file mode 100644
index 0000000..76c5110
--- /dev/null
+++ b/SuperPangWorld/src/de/thdeg/greiner/superpangworld/graphics/moveable/RandomBall.java
@@ -0,0 +1,57 @@
+package de.thdeg.berl.ufofight.graphics.movingobjects;
+
+import de.thdeg.berl.ufofight.gameview.GameView;
+import de.thdeg.berl.ufofight.graphics.base.GameObject;
+import de.thdeg.berl.ufofight.graphics.base.MovingGameObject;
+import de.thdeg.berl.ufofight.graphics.base.Position;
+
+import java.awt.*;
+import java.util.Random;
+
+/** Ball with random movement. */
+public class RandomBall extends GameObject implements MovingGameObject {
+    private final Position targetPosition;
+    private final Random random;
+
+    /**
+     * Creates the GameObject with the GameView to be displayed on.
+     *
+     * @param gameView Window to show the GameObject on.
+     */
+    public RandomBall(GameView gameView) {
+        super(gameView);
+        this.targetPosition = new Position(800, 200);
+        this.random = new Random();
+        this.size = 50;
+        this.speedInPixel = 4;
+    }
+
+    @Override
+    public void updatePosition() {
+        double distance = position.distance(targetPosition);
+        if (distance >= speedInPixel) {
+            position.right((targetPosition.x - position.x) / distance * speedInPixel);
+            position.down((targetPosition.y - position.y) / distance * speedInPixel);
+        } else {
+            setRandomTargetPosition();
+        }
+    }
+
+
+    @Override
+    protected void updateStatus() {
+
+    }
+
+   /** Set position to aim at */
+    public void setRandomTargetPosition() {
+        targetPosition.x = random.nextInt(GameView.WIDTH);
+        targetPosition.y = random.nextInt(GameView.HEIGHT);
+    }
+
+    @Override
+    public void addToCanvas() {
+        gameView.addOvalToCanvas(position.x, position.y, size, size, 2, true, Color.YELLOW);
+        gameView.addOvalToCanvas(targetPosition.x, targetPosition.y, size, size, 2, false, Color.WHITE);
+    }
+}