Initial data commit

Task/Sierpinski-triangle-Graphical/Java/sierpinski-triangle-graphical-1.java

@@ -0,0 +1,58 @@
+import javax.swing.*;
+import java.awt.*;
+
+/**
+* SierpinskyTriangle.java
+* Draws a SierpinskyTriangle in a JFrame
+* The order of complexity is given from command line, but
+* defaults to 3
+*
+* @author Istarnion
+*/
+
+class SierpinskyTriangle {
+
+	public static void main(String[] args) {
+		int i = 3;		// Default to 3
+		if(args.length >= 1) {
+			try {
+				i = Integer.parseInt(args[0]);
+			}
+			catch(NumberFormatException e) {
+				System.out.println("Usage: 'java SierpinskyTriangle [level]'\nNow setting level to "+i);
+			}
+		}
+		final int level = i;
+
+		JFrame frame = new JFrame("Sierpinsky Triangle - Java");
+		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+
+		JPanel panel = new JPanel() {
+			@Override
+			public void paintComponent(Graphics g) {
+				g.setColor(Color.BLACK);
+				drawSierpinskyTriangle(level, 20, 20, 360, (Graphics2D)g);
+			}
+		};
+
+		panel.setPreferredSize(new Dimension(400, 400));
+
+		frame.add(panel);
+		frame.pack();
+		frame.setResizable(false);
+		frame.setLocationRelativeTo(null);
+		frame.setVisible(true);
+	}
+
+	private static void drawSierpinskyTriangle(int level, int x, int y, int size, Graphics2D g) {
+		if(level <= 0) return;
+
+		g.drawLine(x, y, x+size, y);
+		g.drawLine(x, y, x, y+size);
+		g.drawLine(x+size, y, x, y+size);
+
+		drawSierpinskyTriangle(level-1, x, y, size/2, g);
+		drawSierpinskyTriangle(level-1, x+size/2, y, size/2, g);
+		drawSierpinskyTriangle(level-1, x, y+size/2, size/2, g);
+	}
+}