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build.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<!-- You may freely edit this file. See commented blocks below for -->
+<!-- some examples of how to customize the build. -->
+<!-- (If you delete it and reopen the project it will be recreated.) -->
+<!-- By default, only the Clean and Build commands use this build script. -->
+<!-- Commands such as Run, Debug, and Test only use this build script if -->
+<!-- the Compile on Save feature is turned off for the project. -->
+<!-- You can turn off the Compile on Save (or Deploy on Save) setting -->
+<!-- in the project's Project Properties dialog box.-->
+<project name="Aufgabe8_Grafik2D" default="default" basedir=".">
+    <description>Builds, tests, and runs the project Aufgabe8_Grafik2D.</description>
+    <import file="nbproject/build-impl.xml"/>
+    <!--
+
+    There exist several targets which are by default empty and which can be 
+    used for execution of your tasks. These targets are usually executed 
+    before and after some main targets. They are: 
+
+      -pre-init:                 called before initialization of project properties
+      -post-init:                called after initialization of project properties
+      -pre-compile:              called before javac compilation
+      -post-compile:             called after javac compilation
+      -pre-compile-single:       called before javac compilation of single file
+      -post-compile-single:      called after javac compilation of single file
+      -pre-compile-test:         called before javac compilation of JUnit tests
+      -post-compile-test:        called after javac compilation of JUnit tests
+      -pre-compile-test-single:  called before javac compilation of single JUnit test
+      -post-compile-test-single: called after javac compilation of single JUunit test
+      -pre-jar:                  called before JAR building
+      -post-jar:                 called after JAR building
+      -post-clean:               called after cleaning build products
+
+    (Targets beginning with '-' are not intended to be called on their own.)
+
+    Example of inserting an obfuscator after compilation could look like this:
+
+        <target name="-post-compile">
+            <obfuscate>
+                <fileset dir="${build.classes.dir}"/>
+            </obfuscate>
+        </target>
+
+    For list of available properties check the imported 
+    nbproject/build-impl.xml file. 
+
+
+    Another way to customize the build is by overriding existing main targets.
+    The targets of interest are: 
+
+      -init-macrodef-javac:     defines macro for javac compilation
+      -init-macrodef-junit:     defines macro for junit execution
+      -init-macrodef-debug:     defines macro for class debugging
+      -init-macrodef-java:      defines macro for class execution
+      -do-jar:                  JAR building
+      run:                      execution of project 
+      -javadoc-build:           Javadoc generation
+      test-report:              JUnit report generation
+
+    An example of overriding the target for project execution could look like this:
+
+        <target name="run" depends="Aufgabe8_Grafik2D-impl.jar">
+            <exec dir="bin" executable="launcher.exe">
+                <arg file="${dist.jar}"/>
+            </exec>
+        </target>
+
+    Notice that the overridden target depends on the jar target and not only on 
+    the compile target as the regular run target does. Again, for a list of available 
+    properties which you can use, check the target you are overriding in the
+    nbproject/build-impl.xml file. 
+
+    -->
+</project>

manifest.mf

+Manifest-Version: 1.0
+X-COMMENT: Main-Class will be added automatically by build
+

nbproject/genfiles.properties

+build.xml.data.CRC32=1dea3bae
+build.xml.script.CRC32=83be8e95
+build.xml.stylesheet.CRC32=f85dc8f2@1.108.0.48
+# This file is used by a NetBeans-based IDE to track changes in generated files such as build-impl.xml.
+# Do not edit this file. You may delete it but then the IDE will never regenerate such files for you.
+nbproject/build-impl.xml.data.CRC32=1dea3bae
+nbproject/build-impl.xml.script.CRC32=93f995a5
+nbproject/build-impl.xml.stylesheet.CRC32=12e0a6c2@1.108.0.48

nbproject/project.properties

+annotation.processing.enabled=true
+annotation.processing.enabled.in.editor=false
+annotation.processing.processor.options=
+annotation.processing.processors.list=
+annotation.processing.run.all.processors=true
+annotation.processing.source.output=${build.generated.sources.dir}/ap-source-output
+build.classes.dir=${build.dir}/classes
+build.classes.excludes=**/*.java,**/*.form
+# This directory is removed when the project is cleaned:
+build.dir=build
+build.generated.dir=${build.dir}/generated
+build.generated.sources.dir=${build.dir}/generated-sources
+# Only compile against the classpath explicitly listed here:
+build.sysclasspath=ignore
+build.test.classes.dir=${build.dir}/test/classes
+build.test.results.dir=${build.dir}/test/results
+# Uncomment to specify the preferred debugger connection transport:
+#debug.transport=dt_socket
+debug.classpath=\
+    ${run.classpath}
+debug.modulepath=\
+    ${run.modulepath}
+debug.test.classpath=\
+    ${run.test.classpath}
+debug.test.modulepath=\
+    ${run.test.modulepath}
+# Files in build.classes.dir which should be excluded from distribution jar
+dist.archive.excludes=
+# This directory is removed when the project is cleaned:
+dist.dir=dist
+dist.jar=${dist.dir}/Aufgabe8_Grafik2D.jar
+dist.javadoc.dir=${dist.dir}/javadoc
+dist.jlink.dir=${dist.dir}/jlink
+dist.jlink.output=${dist.jlink.dir}/Aufgabe8_Grafik2D
+excludes=
+includes=**
+jar.compress=false
+javac.classpath=
+# Space-separated list of extra javac options
+javac.compilerargs=
+javac.deprecation=false
+javac.external.vm=true
+javac.modulepath=
+javac.processormodulepath=
+javac.processorpath=\
+    ${javac.classpath}
+javac.source=21
+javac.target=21
+javac.test.classpath=\
+    ${javac.classpath}:\
+    ${build.classes.dir}
+javac.test.modulepath=\
+    ${javac.modulepath}
+javac.test.processorpath=\
+    ${javac.test.classpath}
+javadoc.additionalparam=
+javadoc.author=false
+javadoc.encoding=${source.encoding}
+javadoc.html5=false
+javadoc.noindex=false
+javadoc.nonavbar=false
+javadoc.notree=false
+javadoc.private=false
+javadoc.splitindex=true
+javadoc.use=true
+javadoc.version=false
+javadoc.windowtitle=
+# The jlink additional root modules to resolve
+jlink.additionalmodules=
+# The jlink additional command line parameters
+jlink.additionalparam=
+jlink.launcher=true
+jlink.launcher.name=Aufgabe8_Grafik2D
+main.class=aufgabe8_grafik2d.Start
+manifest.file=manifest.mf
+meta.inf.dir=${src.dir}/META-INF
+mkdist.disabled=false
+platform.active=default_platform
+run.classpath=\
+    ${javac.classpath}:\
+    ${build.classes.dir}
+# Space-separated list of JVM arguments used when running the project.
+# You may also define separate properties like run-sys-prop.name=value instead of -Dname=value.
+# To set system properties for unit tests define test-sys-prop.name=value:
+run.jvmargs=
+run.modulepath=\
+    ${javac.modulepath}
+run.test.classpath=\
+    ${javac.test.classpath}:\
+    ${build.test.classes.dir}
+run.test.modulepath=\
+    ${javac.test.modulepath}
+source.encoding=UTF-8
+src.dir=src
+test.src.dir=test

nbproject/project.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://www.netbeans.org/ns/project/1">
+    <type>org.netbeans.modules.java.j2seproject</type>
+    <configuration>
+        <data xmlns="http://www.netbeans.org/ns/j2se-project/3">
+            <name>Aufgabe8_Grafik2D</name>
+            <source-roots>
+                <root id="src.dir"/>
+            </source-roots>
+            <test-roots>
+                <root id="test.src.dir"/>
+            </test-roots>
+        </data>
+    </configuration>
+</project>

src/aufgabe8_grafik2d/Start.java

+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Main.java to edit this template
+ */
+
+package aufgabe8_grafik2d;
+
+import java.awt.Container;
+import javax.swing.JFrame;
+import javax.swing.OverlayLayout;
+import javax.swing.WindowConstants;
+
+/**
+ *
+ * @author ahren
+ */
+public class Start 
+{
+  public Start()
+  {
+    JFrame frm = new JFrame();
+    frm.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
+    Container c = frm.getContentPane();
+    
+    c.setLayout(new OverlayLayout(c));
+    for (int i = 0; i < 100; i++)
+    {
+      long schlafzeit = (long)(1 + 100*Math.random());
+      Zeiger papier = new Zeiger(schlafzeit);
+      papier.setOpaque(false);
+      c.add(papier);
+      papier.start();
+    }
+    frm.setSize(1000, 900);
+    
+    frm.setVisible(true);
+
+  }
+
+  public static void main(String[] args) 
+  {
+    new Start();
+  }
+
+}

src/aufgabe8_grafik2d/Zeiger.java

 
 package aufgabe8_grafik2d;
 
+import java.awt.BasicStroke;
+import java.awt.Color;
+import java.awt.Graphics;
+import java.awt.Graphics2D;
+import java.awt.RenderingHints;
+import java.awt.geom.Line2D;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.Future;
 import javax.swing.JComponent;
 
 /**
  */
 public class Zeiger extends JComponent implements Runnable
 {
-  public Zeiger()
-  {
+  private static final float DICKE = 4f;
+  private Line2D.Float linie;
+  private BasicStroke stift;
+  private volatile float radius;
+  private volatile float minRadius;
+  private volatile float maxRadius;
+  private long schlafzeit;
+  private ExecutorService eService;
+  private Future task;
   
+  public Zeiger(long schlafzeit)
+  {
+    this.schlafzeit = schlafzeit;
+    linie = new Line2D.Float();
+    stift = new BasicStroke(DICKE);
+    radius = 100;
+    minRadius = DICKE;
+    eService = Executors.newSingleThreadExecutor();
+    task = null;
   }
 
   @Override
   public void run()
   {
+    float delta = 1f;
+    while(true)
+    {
+      synchronized(this)
+      {
+        if (radius > maxRadius) delta = -1f;
+        if (radius < minRadius) delta = +1f;
+        radius += delta;
+      }
+      this.repaint();
+      try
+      {
+        Thread.sleep(schlafzeit);
+      }
+      catch (Exception ex)
+      {
+        //lg.severe(ex.toString());
+      }
+    }
+  }
+
+  public void start()
+  {
+    if (task == null)
+    {
+      task = eService.submit(this);
+    }
   }
+  @Override
+  public void paintComponent(Graphics g)
+  {
+    super.paintComponent(g);
+    Graphics2D g2 = (Graphics2D)g;
+    
+    g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
+                        RenderingHints.VALUE_ANTIALIAS_ON);
+    
+    float breite = this.getWidth() - 1;
+    float hoehe = this.getHeight() - 1;
+ 
+    synchronized(this)
+    {
+      maxRadius = -DICKE/2 + Math.min(breite, hoehe) / 2;
+    }
+    
+    float x = breite/2 - radius;
+    float y = hoehe/2 - radius;
+    
+    linie.setFrame(x, y, 2*radius, 2*radius);
+    
+    g2.setStroke(stift);
+    g2.setPaint(Color.RED);
+//    g2.fill(ellipse);
+//    g2.setPaint(Color.BLACK);
+    g2.draw(linie);
+  }
+  
 }
+
+