Cranc/Sierpinski.java

## Sierpinski.java
import java.io.PrintWriter;
/**
 * @author Lukas Kalbertodt
 */
public class Sierpinski {
    private static int svgHeight = 1000;
    private static int svgWidth = 1000;

    private static String HTMLHeader = "<!DOCTYPE html>\n" +
            "<html>\n" +
            "<body>";
    private static String HTMLclose = "</body>\n" +
            "</html>";

    private static String XMLhead = "<?xml version=\"1.0\" encoding=\"iso-8859-1\"?>";

    private static String svgclose = "</svg>";
    private static String svghead = "<svg height=\""+ svgHeight +"\" width=\""+ svgWidth +"\">";

    private static String polygonhead = "<polygon points=\"";
    private static String polygonstyleBlack = "\"style=\"fill:black;stroke:black;stroke-width:1;fill-rule:nonzero;\" />";
    private static String polygonstyleWhite = "\"style=\"fill:white;stroke:black;stroke-width:1;fill-rule:nonzero;\" />";

    private static int mainHeight = 1000;
    private static int mainWidth = 1000;

    private static boolean html = true;

    public static void main(String[] args) {
        // #### Try to parse command line argument ####
        int iterations = 0;
        if (args.length < 1) {
            printUsage();
            return;
        }

        try {
            iterations = Integer.parseInt(args[0]);
        } catch(Exception e) {
            System.out.println("I wasn't able to parse your argument as "
                    + "an integer :(");
            printUsage();
            return;
        }

        if (iterations < 0) {
            System.out.println("You need to hand me a POSITIVE integer :(");
            printUsage();
            return;
        }

        // #### Open file ####
        PrintWriter out;
        try {
            String fileName;
            if(html)
                fileName = "sierpinski-" + iterations + ".html";
            else
                fileName = "sierpinski-" + iterations + ".svg";
            out = new PrintWriter(fileName, "UTF-8");
        } catch (Exception e) {
            System.out.println("Oops, some IO error occurred!");
            return;
        }

        // TODO: Write data to file

        // Dummy data. Hint: this isn't valid svg!
        if(html)
            out.println(HTMLHeader);
        out.println(XMLhead);
        out.println(svghead);
        //generate initial triangle
        String draw = polygonhead;
        Point a,b,c;
        int x,y;
        x = (svgWidth - mainWidth) / 2;
        y = (svgHeight - mainHeight) / 2;
        y += svgHeight;
        a = new Point(x,y);

        x = (svgWidth - mainWidth) / 2;
        y = (svgHeight - mainHeight) / 2;
        x += (mainWidth / 2);
        b = new Point(x,y);

        x = (svgWidth - mainWidth) / 2;
        y = (svgHeight - mainHeight) / 2;
        x += mainWidth;
        y += mainHeight;
        c = new Point(x,y);

        draw += a.x + "," + a.y;
        draw += " ";
        draw += b.x + "," + b.y;
        draw += " ";
        draw += c.x + "," + c.y;
        draw += polygonstyleBlack;
        out.println(draw);

        Triangle t = new Triangle(a,b,c);
        drawit(iterations,t,out);

        //close svg
        out.println(svgclose);
        if(html)
            out.println(HTMLclose);
        // I miss RAII :/
        out.close();
    }

    /**
     * Prints information about how to invoke this program on the terminal.
     */
    private static void printUsage() {
        System.out.println("Usage:");
        System.out.println("    java Sierpinski <iterations>");
        System.out.println();
        System.out.println("  For example:  java Sierpinski 4");
    }

    private static void drawit(int iter, Triangle tri, PrintWriter out){
        if(iter <= 0)
            return;
        Triangle newtri[] = new Triangle[3];

        String draw = polygonhead;
        Point a,b,c;
        a = new Point((tri.a.x + tri.b.x) / 2, (tri.a.y + tri.b.y) / 2);
        b = new Point((tri.b.x + tri.c.x) / 2, (tri.b.y + tri.c.y) / 2);
        c = new Point((tri.a.x + tri.c.x) / 2, (tri.a.y + tri.c.y) / 2);
        //draw inner polygon
        draw += a.x + "," + a.y;
        draw += " ";
        draw += b.x + "," + b.y;
        draw += " ";
        draw += c.x + "," + c.y;
        draw += polygonstyleWhite;
        out.println(draw);

        //generate new triangles
        newtri[0] = new Triangle(tri.a,a,c);
        newtri[1] = new Triangle(a,tri.b,b);
        newtri[2] = new Triangle(c,b,tri.c);
        iter--;
        for (Triangle t: newtri) {
            drawit(iter,t,out);
        }
    }
}
	import java.io.PrintWriter;
	/**
	* @author Lukas Kalbertodt
	*/
	public class Sierpinski {
	private static int svgHeight = 1000;
	private static int svgWidth = 1000;

	private static String HTMLHeader = "<!DOCTYPE html>\n" +
	"<html>\n" +
	"<body>";
	private static String HTMLclose = "</body>\n" +
	"</html>";

	private static String XMLhead = "<?xml version=\"1.0\" encoding=\"iso-8859-1\"?>";

	private static String svgclose = "</svg>";
	private static String svghead = "<svg height=\""+ svgHeight +"\" width=\""+ svgWidth +"\">";

	private static String polygonhead = "<polygon points=\"";
	private static String polygonstyleBlack = "\"style=\"fill:black;stroke:black;stroke-width:1;fill-rule:nonzero;\" />";
	private static String polygonstyleWhite = "\"style=\"fill:white;stroke:black;stroke-width:1;fill-rule:nonzero;\" />";

	private static int mainHeight = 1000;
	private static int mainWidth = 1000;

	private static boolean html = true;

	public static void main(String[] args) {
	// #### Try to parse command line argument ####
	int iterations = 0;
	if (args.length < 1) {
	printUsage();
	return;
	}

	try {
	iterations = Integer.parseInt(args[0]);
	} catch(Exception e) {
	System.out.println("I wasn't able to parse your argument as "
	+ "an integer :(");
	printUsage();
	return;
	}

	if (iterations < 0) {
	System.out.println("You need to hand me a POSITIVE integer :(");
	printUsage();
	return;
	}

	// #### Open file ####
	PrintWriter out;
	try {
	String fileName;
	if(html)
	fileName = "sierpinski-" + iterations + ".html";
	else
	fileName = "sierpinski-" + iterations + ".svg";
	out = new PrintWriter(fileName, "UTF-8");
	} catch (Exception e) {
	System.out.println("Oops, some IO error occurred!");
	return;
	}

	// TODO: Write data to file

	// Dummy data. Hint: this isn't valid svg!
	if(html)
	out.println(HTMLHeader);
	out.println(XMLhead);
	out.println(svghead);
	//generate initial triangle
	String draw = polygonhead;
	Point a,b,c;
	int x,y;
	x = (svgWidth - mainWidth) / 2;
	y = (svgHeight - mainHeight) / 2;
	y += svgHeight;
	a = new Point(x,y);

	x = (svgWidth - mainWidth) / 2;
	y = (svgHeight - mainHeight) / 2;
	x += (mainWidth / 2);
	b = new Point(x,y);

	x = (svgWidth - mainWidth) / 2;
	y = (svgHeight - mainHeight) / 2;
	x += mainWidth;
	y += mainHeight;
	c = new Point(x,y);

	draw += a.x + "," + a.y;
	draw += " ";
	draw += b.x + "," + b.y;
	draw += " ";
	draw += c.x + "," + c.y;
	draw += polygonstyleBlack;
	out.println(draw);

	Triangle t = new Triangle(a,b,c);
	drawit(iterations,t,out);

	//close svg
	out.println(svgclose);
	if(html)
	out.println(HTMLclose);
	// I miss RAII :/
	out.close();
	}

	/**
	* Prints information about how to invoke this program on the terminal.
	*/
	private static void printUsage() {
	System.out.println("Usage:");
	System.out.println(" java Sierpinski <iterations>");
	System.out.println();
	System.out.println(" For example: java Sierpinski 4");
	}

	private static void drawit(int iter, Triangle tri, PrintWriter out){
	if(iter <= 0)
	return;
	Triangle newtri[] = new Triangle[3];

	String draw = polygonhead;
	Point a,b,c;
	a = new Point((tri.a.x + tri.b.x) / 2, (tri.a.y + tri.b.y) / 2);
	b = new Point((tri.b.x + tri.c.x) / 2, (tri.b.y + tri.c.y) / 2);
	c = new Point((tri.a.x + tri.c.x) / 2, (tri.a.y + tri.c.y) / 2);
	//draw inner polygon
	draw += a.x + "," + a.y;
	draw += " ";
	draw += b.x + "," + b.y;
	draw += " ";
	draw += c.x + "," + c.y;
	draw += polygonstyleWhite;
	out.println(draw);

	//generate new triangles
	newtri[0] = new Triangle(tri.a,a,c);
	newtri[1] = new Triangle(a,tri.b,b);
	newtri[2] = new Triangle(c,b,tri.c);
	iter--;
	for (Triangle t: newtri) {
	drawit(iter,t,out);
	}
	}
	}