diff options
| author | Sven Eisenhauer <sven@sven-eisenhauer.net> | 2023-11-10 15:11:48 +0100 |
|---|---|---|
| committer | Sven Eisenhauer <sven@sven-eisenhauer.net> | 2023-11-10 15:11:48 +0100 |
| commit | 33613a85afc4b1481367fbe92a17ee59c240250b (patch) | |
| tree | 670b842326116b376b505ec2263878912fca97e2 /Master/Reference Architectures and Patterns/hjp5/examples/Listing3409.java | |
| download | Studium-master.tar.gz Studium-master.tar.bz2 | |
Diffstat (limited to 'Master/Reference Architectures and Patterns/hjp5/examples/Listing3409.java')
| -rw-r--r-- | Master/Reference Architectures and Patterns/hjp5/examples/Listing3409.java | 176 |
1 files changed, 176 insertions, 0 deletions
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);
+ }
+}
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