Data commit

Task/Archimedean-spiral/Java/archimedean-spiral.java

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+import java.awt.*;
+import static java.lang.Math.*;
+import javax.swing.*;
+
+public class ArchimedeanSpiral extends JPanel {
+
+    public ArchimedeanSpiral() {
+        setPreferredSize(new Dimension(640, 640));
+        setBackground(Color.white);
+    }
+
+    void drawGrid(Graphics2D g) {
+        g.setColor(new Color(0xEEEEEE));
+        g.setStroke(new BasicStroke(2));
+
+        double angle = toRadians(45);
+
+        int w = getWidth();
+        int center = w / 2;
+        int margin = 10;
+        int numRings = 8;
+
+        int spacing = (w - 2 * margin) / (numRings * 2);
+
+        for (int i = 0; i < numRings; i++) {
+            int pos = margin + i * spacing;
+            int size = w - (2 * margin + i * 2 * spacing);
+            g.drawOval(pos, pos, size, size);
+
+            double ia = i * angle;
+            int x2 = center + (int) (cos(ia) * (w - 2 * margin) / 2);
+            int y2 = center - (int) (sin(ia) * (w - 2 * margin) / 2);
+
+            g.drawLine(center, center, x2, y2);
+        }
+    }
+
+    void drawSpiral(Graphics2D g) {
+        g.setStroke(new BasicStroke(2));
+        g.setColor(Color.orange);
+
+        double degrees = toRadians(0.1);
+        double center = getWidth() / 2;
+        double end = 360 * 2 * 10 * degrees;
+        double a = 0;
+        double b = 20;
+        double c = 1;
+
+        for (double theta = 0; theta < end; theta += degrees) {
+            double r = a + b * pow(theta, 1 / c);
+            double x = r * cos(theta);
+            double y = r * sin(theta);
+            plot(g, (int) (center + x), (int) (center - y));
+        }
+    }
+
+    void plot(Graphics2D g, int x, int y) {
+        g.drawOval(x, y, 1, 1);
+    }
+
+    @Override
+    public void paintComponent(Graphics gg) {
+        super.paintComponent(gg);
+        Graphics2D g = (Graphics2D) gg;
+        g.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
+                RenderingHints.VALUE_ANTIALIAS_ON);
+
+        drawGrid(g);
+        drawSpiral(g);
+    }
+
+    public static void main(String[] args) {
+        SwingUtilities.invokeLater(() -> {
+            JFrame f = new JFrame();
+            f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+            f.setTitle("Archimedean Spiral");
+            f.setResizable(false);
+            f.add(new ArchimedeanSpiral(), BorderLayout.CENTER);
+            f.pack();
+            f.setLocationRelativeTo(null);
+            f.setVisible(true);
+        });
+    }
+}