z02

z02/.classpath

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+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="src" path="src"/>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-17">
+		<attributes>
+			<attribute name="module" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="lib" path="/home/stud/p8q-yhw-u1/Downloads/DrawingPanel.jar"/>
+	<classpathentry kind="output" path="bin"/>
+</classpath>

z02/.gitignore

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+/bin/

z02/.project

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+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>z02</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+	</natures>
+</projectDescription>

z02/.settings/org.eclipse.jdt.core.prefs

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+eclipse.preferences.version=1
+org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
+org.eclipse.jdt.core.compiler.codegen.targetPlatform=17
+org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve
+org.eclipse.jdt.core.compiler.compliance=17
+org.eclipse.jdt.core.compiler.debug.lineNumber=generate
+org.eclipse.jdt.core.compiler.debug.localVariable=generate
+org.eclipse.jdt.core.compiler.debug.sourceFile=generate
+org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
+org.eclipse.jdt.core.compiler.problem.enablePreviewFeatures=disabled
+org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
+org.eclipse.jdt.core.compiler.problem.reportPreviewFeatures=warning
+org.eclipse.jdt.core.compiler.release=enabled
+org.eclipse.jdt.core.compiler.source=17

z02/src/Loc.java

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+import java.awt.Graphics;
+
+/** Klasseninvariante: x>=0 und y>=0. */
+
+public class Loc {
+    private int x;
+    private int y;
+
+    
+    /** Initialisiert das Objekt mit gegebenen Koordinatenwerten.
+     *  @param initialX Vorbedingung: >= 0
+     *  @param initialY Vorbedigung: >= 0. 
+     *  @exception IllegalArgumentException falls einer der Eingabeparameter ungültig ist. 
+     */
+    public Loc(int initialX, int initialY) {
+        setLocation(initialX, initialY);
+    }
+
+    public Loc() {
+        this(0, 0);
+    }
+
+    public int getX() {
+        return x;
+    }
+
+    public int getY() {
+        return y;
+    }
+
+    public void draw(Graphics g) {
+        g.fillOval(x, y, 3, 3);
+        //g.drawString("(" + x + ", " + y + ")", x, y);
+    }
+
+    /** Setzt die Koordinaten auf neue Werte.
+     *  @param newx Vorbedingung: >= 0
+     *  @param newy Vorbedigung: >= 0. 
+     *  @exception IllegalArgumentException falls einer der Eingabeparameter ungültig ist. 
+     */
+    public void setLocation(int newx, int newy) {
+        if (newx < 0 || newy < 0) {
+            throw new IllegalArgumentException("x und y müssen >= 0 sein");
+        }
+        x = newx;
+        y = newy;
+    }
+
+    public void translate(int dx, int dy) {
+        setLocation(x + dx, y + dy);
+    }
+
+    public double distance(Loc other) {
+        int dx = x - other.x;
+        int dy = y - other.y;
+        return Math.sqrt(dx * dx + dy * dy);
+    }
+
+    public double distanceFromOrigin() {
+        Loc origin = new Loc();
+        return distance(origin);
+    }
+
+    public String toString() {
+        return "(" + x + ", " + y + ")";
+    }
+    
+    /**
+     * gibt einen integer zwischen 0 und 8 abhängig vom Winkel des Punktes zur x-Achse zurück
+     */
+    public int getSector() {
+        double alpha = Math.atan2(this.y, this.x);
+        int sector = (int) Math.floor(alpha / (Math.PI / 2) * 9);
+        if (sector > 8) {
+            return 8;
+        }
+        return sector;
+    }
+}

z02/src/Main.java

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+import com.bjp.*;
+import java.util.*;
+import java.awt.*;
+
+public class Main {
+    public static void main(String[] args) {
+        Color[] colors= { Color.RED, Color.BLUE, Color.CYAN, Color.GRAY, Color.GREEN, Color.MAGENTA, Color.ORANGE, Color.BLACK, Color.YELLOW };
+        final int W=400; 
+        final int H=300;
+        DrawingPanel pnl= new DrawingPanel(W,H);
+        Graphics g= pnl.getGraphics();
+        final int N= 5000;
+        Random rand= new Random();
+        for (int i=0; i<N; i++) {
+            Loc loc= new Loc(rand.nextInt(W), rand.nextInt(H));
+            int index= loc.getSector();
+            g.setColor(colors[index]);
+            loc.draw(g);
+        }
+    }
+}