This is “a” Solution of Assignment 2 - Problem 3 from the Computer Science Course CS106A of Prof. Mehran Sahami at the STANFORD University.

In fact, i cant realy tell anymore if I wrote this code or if i found it somewhere on the internet :). It looks pretty much like programm code i usualy make. But will not claim that this is MY Code. Just a Code that solves the Problem as requested for example purposes.

ProgramHierarchy.java

/*
 * File: ProgramHierarchy.java
 * Name: 
 * Section Leader: 
 * ---------------------------
 * This file is the starter file for the ProgramHierarchy problem.
 */
 
import acm.graphics.*;
import acm.program.*;
 
 
public class ProgramHierarchy_example_solution1 extends GraphicsProgram {
 
	public static final double BOX_WIDTH = 200.0;
	public static final double BOX_HEIGHT = 80.0;
 
	public void run() {
		double horizontalMargin = (getWidth() - BOX_WIDTH * 3) / 4;
		double verticalMargin = (getHeight() - BOX_HEIGHT * 2) / 3;
 
		double x = horizontalMargin * 2 + BOX_WIDTH;
		double y = verticalMargin;
 
		GRect box1 = drawBox(x, y, "Program");
 
		x = horizontalMargin;
		y = verticalMargin * 2 + BOX_HEIGHT;
 
		GRect box2 = drawBox(x, y, "GraphicsProgram");
 
		x = horizontalMargin * 2 + BOX_WIDTH;
		y = verticalMargin * 2 + BOX_HEIGHT;
 
		GRect box3 = drawBox(x, y, "ConsoleProgram");
 
		x = horizontalMargin * 3 + BOX_WIDTH * 2;
		y = verticalMargin * 2 + BOX_HEIGHT;
 
		GRect box4 = drawBox(x, y, "DialogProgram");
 
		drawConnectingLine(box1, box2);
		drawConnectingLine(box1, box3);
		drawConnectingLine(box1, box4);
	}
 
	public GRect drawBox (double x, double y, String text) {
 
		GRect box = new GRect (x, y, BOX_WIDTH, BOX_HEIGHT);
		add(box);
 
		GLabel label = new GLabel (text, x, y);
 
		x = x  + BOX_WIDTH / 2 - label.getWidth() / 2;
		y = y + BOX_HEIGHT / 2 + label.getAscent() / 2 ;
 
		label.setLocation (x, y);
		add (label);
 
		return box;
	}
 
	public void drawConnectingLine(GRect fromBox, GRect toBox) {
 
		double fromX = fromBox.getX() + BOX_WIDTH / 2;
		double fromY = fromBox.getY() + BOX_HEIGHT;
 
		double toX = toBox.getX() + BOX_WIDTH / 2;
		double toY = toBox.getY();
 
		GLine line = new GLine (fromX, fromY, toX, toY);
		add(line);
	}
}

— Axel Werner 2012-04-02 16:07