Added generic polygon drawing

src/AudioClient.java

@@ -10,17 +10,9 @@ public class AudioClient {
     AudioPlayer player = new AudioPlayer();
     AudioPlayer.FORMAT = new XtFormat(new XtMix(sampleRate, XtSample.FLOAT32), 0, 0, 2, 0);
 
-    // Draws a square.
-    Line l1 = new Line(-0.5, -0.5, 0.5, -0.5);
-    Line l2 = new Line(0.5, -0.5, 0.5, 0.5);
-    Line l3 = new Line(0.5, 0.5, -0.5, 0.5);
-    Line l4 = new Line(-0.5, 0.5, -0.5, -0.5);
-
-    AudioPlayer.addLine(l1);
-    AudioPlayer.addLine(l2);
-    AudioPlayer.addLine(l3);
-    AudioPlayer.addLine(l4);
-    
+    for (int i = 2; i < 7; i++) {
+      AudioPlayer.addLines(generatePolygon(i, 0.5));
+    }
     AudioPlayer.setRotateSpeed(0.4);
 
     player.start();
@@ -32,8 +24,19 @@ public class AudioClient {
   public static List<Line> generatePolygon(int sides, double scale) {
     List<Line> polygon = new ArrayList<>();
 
-    Point start = new Point(scale, scale);
+    double theta = 2 * Math.PI / sides;
 
-    return null;
+    Point start = new Point(scale, scale);
+    Point rotated = start.rotate(theta);
+
+    polygon.add(new Line(start, rotated));
+
+    while (!rotated.equals(start)) {
+      polygon.add(new Line(rotated.copy(), rotated.rotate(theta)));
+
+      rotated = rotated.rotate(theta);
+    }
+
+    return polygon;
   }
 }

src/AudioPlayer.java

@@ -53,6 +53,10 @@ public class AudioPlayer extends Thread {
     AudioPlayer.lines.add(line);
   }
 
+  public static void addLines(List<Line> lines) {
+    AudioPlayer.lines.addAll(lines);
+  }
+
   private static Line currentLine() {
     return lines.get(currentLine % lines.size());
   }

src/Line.java

@@ -20,6 +20,10 @@ public class Line {
     return new Line(getA().rotate(theta), getB().rotate(theta));
   }
 
+  public Line copy() {
+    return new Line(getA().copy(), getB().copy());
+  }
+
   public Point getA() {
     return a;
   }

src/Point.java

@@ -38,14 +38,15 @@ public class Point {
     }
   }
 
+  public Point copy() {
+    return new Point(x, y);
+  }
+
   public Point rotate(double theta) {
-    double oldX = getX();
-    double oldY = getY();
+    Point point = new Point(getX(), getY());
 
-    Point point = new Point(oldX, oldY);
-
-    point.setX(oldX * Math.cos(theta) - oldY * Math.sin(theta));
-    point.setY(oldX * Math.sin(theta) + oldY * Math.cos(theta));
+    point.setX(getX() * Math.cos(theta) - getY() * Math.sin(theta));
+    point.setY(getX() * Math.sin(theta) + getY() * Math.cos(theta));
 
     return point;
   }