From 33613a85afc4b1481367fbe92a17ee59c240250b Mon Sep 17 00:00:00 2001
From: Sven Eisenhauer <sven@sven-eisenhauer.net>
Date: Fri, 10 Nov 2023 15:11:48 +0100
Subject: add new repo

---
 .../hjp5/examples/Listing3409.java                 | 176 +++++++++++++++++++++
 1 file changed, 176 insertions(+)
 create mode 100644 Master/Reference Architectures and Patterns/hjp5/examples/Listing3409.java

(limited to 'Master/Reference Architectures and Patterns/hjp5/examples/Listing3409.java')

diff --git a/Master/Reference Architectures and Patterns/hjp5/examples/Listing3409.java b/Master/Reference Architectures and Patterns/hjp5/examples/Listing3409.java
new file mode 100644
index 0000000..58f20bc
--- /dev/null
+++ b/Master/Reference Architectures and Patterns/hjp5/examples/Listing3409.java	
@@ -0,0 +1,176 @@
+/* Listing3409.java */
+
+import java.awt.*;
+import java.awt.event.*;
+import java.util.*;
+
+class ColorRectangle
+extends Rectangle
+{
+  public Color color;
+}
+
+public class Listing3409
+extends Frame
+implements Runnable
+{
+  //Konstanten
+  private static final int   SIZERECT    = 7;
+  private static final int   SLEEP       = 40;
+  private static final int   NUMELEMENTS = 20;
+  private static final Color BGCOLOR     = Color.lightGray;
+
+  //Instanzvariablen
+  private Thread th;
+  private Vector snake;
+  private int dx;
+  private int dy;
+
+  public static void main(String[] args)
+  {
+    Listing3409 frame = new Listing3409();
+    frame.setSize(200,150);
+    frame.setVisible(true);
+    frame.startAnimation();
+  }
+
+  public Listing3409()
+  {
+    super("Animierte Schlange");
+    setBackground(BGCOLOR);
+    addWindowListener(new WindowClosingAdapter(true));
+    snake = new Vector();
+  }
+
+  public void startAnimation()
+  {
+    th = new Thread(this);
+    th.start();
+  }
+
+  public void run()
+  {
+    //Schlange konstruieren
+    ColorRectangle cr;
+    int x = 100;
+    int y = 100;
+    for (int i=0; i < NUMELEMENTS; ++i) {
+      cr = new ColorRectangle();
+      cr.x = x;
+      cr.y = y;
+      cr.width = SIZERECT;
+      cr.height = SIZERECT;
+      x += SIZERECT;
+      cr.color = new Color(
+        i*(256/NUMELEMENTS),
+        0,
+        240-i*(256/NUMELEMENTS)
+      );
+      snake.addElement(cr);
+    }
+
+    //Vorzugsrichtung festlegen
+    dx = -1;
+    dy = -1;
+
+    //Schlange laufen lassen
+    while (true) {
+      repaint();
+      try {
+        Thread.sleep(SLEEP);
+      } catch (InterruptedException e){
+        //nichts
+      }
+      moveSnake();
+    }
+  }
+
+  public void moveSnake()
+  {
+    Dimension size = getSize();
+    int sizex = size.width-getInsets().left-getInsets().right;
+    int sizey = size.height-getInsets().top-getInsets().bottom;
+    ColorRectangle cr = (ColorRectangle)snake.firstElement();
+    boolean lBorder = false;
+    int xalt, yalt;
+    int xtmp, ytmp;
+
+    //Kopf der Schlange neu berechnen
+    if (cr.x <= 1) {
+      dx = 1;
+      lBorder = true;
+    }
+    if (cr.x + cr.width >= sizex) {
+      dx = -1;
+      lBorder = true;
+    }
+    if (cr.y <= 1) {
+      dy = 1;
+      lBorder = true;
+    }
+    if (cr.y + cr.height >= sizey) {
+      dy = -1;
+      lBorder = true;
+    }
+    if (! lBorder) {
+      if (rand(10) == 0) {
+        if (rand(2) == 0) {
+          switch (rand(5)) {
+          case 0: case 1:
+            dx = -1;
+            break;
+          case 2:
+            dx = 0;
+            break;
+          case 3: case 4:
+            dx = 1;
+            break;
+          }
+        } else {
+          switch (rand(5)) {
+          case 0: case 1:
+            dy = -1;
+            break;
+          case 2:
+            dy = 0;
+            break;
+          case 3: case 4:
+            dy = 1;
+            break;
+          }
+        }
+      }
+    }
+    xalt = cr.x + SIZERECT * dx;
+    yalt = cr.y + SIZERECT * dy;
+    //Rest der Schlange hinterherziehen
+    Enumeration e = snake.elements();
+    while (e.hasMoreElements()) {
+      cr = (ColorRectangle)e.nextElement();
+      xtmp = cr.x;
+      ytmp = cr.y;
+      cr.x = xalt;
+      cr.y = yalt;
+      xalt = xtmp;
+      yalt = ytmp;
+    }
+  }
+
+  public void paint(Graphics g)
+  {
+    ColorRectangle cr;
+    Enumeration e = snake.elements();
+    int inleft    = getInsets().left;
+    int intop     = getInsets().top;
+    while (e.hasMoreElements()) {
+      cr = (ColorRectangle)e.nextElement();
+      g.setColor(cr.color);
+      g.fillRect(cr.x+inleft,cr.y+intop,cr.width,cr.height);
+    }
+  }
+
+  private int rand(int limit)
+  {
+    return (int)(Math.random() * limit);
+  }
+}
\ No newline at end of file
-- 
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