all tasks

Task/Yin-and-yang/Java/yin-and-yang.java

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+package org.rosettacode.yinandyang;
+
+import java.awt.Color;
+import java.awt.Graphics;
+import java.awt.Image;
+import java.awt.image.BufferedImage;
+import javax.swing.ImageIcon;
+import javax.swing.JFrame;
+import javax.swing.JLabel;
+
+public class YinYangGenerator
+{
+    private final int size;
+
+    public YinYangGenerator(final int size)
+    {
+        this.size = size;
+    }
+
+    /**
+     *  Draw a yin yang symbol on the given graphics context.
+     */
+    public void drawYinYang(final Graphics graphics)
+    {
+        // Preserve the color for the caller
+        final Color colorSave = graphics.getColor();
+
+        graphics.setColor(Color.WHITE);
+        // Use fillOval to draw a filled in circle
+        graphics.fillOval(0, 0, size-1, size-1);
+
+        graphics.setColor(Color.BLACK);
+        // Use fillArc to draw part of a filled in circle
+        graphics.fillArc(0, 0, size-1, size-1, 270, 180);
+        graphics.fillOval(size/4, size/2, size/2, size/2);
+
+        graphics.setColor(Color.WHITE);
+        graphics.fillOval(size/4, 0, size/2, size/2);
+        graphics.fillOval(7*size/16, 11*size/16, size/8, size/8);
+
+        graphics.setColor(Color.BLACK);
+        graphics.fillOval(7*size/16, 3*size/16, size/8, size/8);
+        // Use drawOval to draw an empty circle for the outside border
+        graphics.drawOval(0, 0, size-1, size-1);
+
+        // Restore the color for the caller
+        graphics.setColor(colorSave);
+    }
+
+    /**
+     *  Create an image containing a yin yang symbol.
+     */
+    public Image createImage(final Color bg)
+    {
+        // A BufferedImage creates the image in memory
+        final BufferedImage image = new BufferedImage(size, size, BufferedImage.TYPE_INT_RGB);
+        // Get the graphics object for the image; note in many
+        // applications you actually use Graphics2D for the
+        // additional API calls
+        final Graphics graphics = image.getGraphics();
+        // Color in the background of the image
+        graphics.setColor(bg);
+        graphics.fillRect(0,0,size,size);
+        drawYinYang(graphics);
+        return image;
+    }
+
+    public static void main(final String args[])
+    {
+        final int size = Integer.parseInt(args[0]);
+        final YinYangGenerator generator = new YinYangGenerator(size);
+
+        final JFrame frame = new JFrame("Yin Yang Generator");
+        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        final Image yinYang = generator.createImage(frame.getBackground());
+        // Use JLabel to display an image
+        frame.add(new JLabel(new ImageIcon(yinYang)));
+        frame.pack();
+        frame.setVisible(true);
+    }
+}