Trying to stagger GRect like stairs... Math issue

[styerfoam]

I am working with the acm.jar library to help learn Java. I am working on an application for school that creates an IO Dialog asking users how many stairs they would like to draw.

Then I am supposed to use a loop to draw those stairs. The first half to be blue the second half to be red.

I am lost in the math of how to get the rectangles to stagger. I have tried several things. The code below includes my latest attempt which is still failing.

If there is anyone who can help with just the math part I would be eternally grateful:

import acm.program.GraphicsProgram;
import acm.io.IODialog;
import acm.graphics.GRect;
//import acm.graphics.GLabel;
//import java.awt.Color;

public class StairsGraphical extends GraphicsProgram {

		public static final int APP_WIDTH = 500;
		public static final int APP_HEIGHT = 300;
		public static final double BOX_WIDTH = 75;
		public static final double BOX_HEIGHT = 25;
	
		public void init()
		{
			//setting app size to display stairs
			this.setSize(APP_WIDTH, APP_HEIGHT);
			
			//asking user for number of stairs
			IODialog dialog = new IODialog();
			int stairsValue = dialog.readInt("Number of Stairs: between 5 and 10");
			
			//GRect stairRect = new GRect (BOX_WIDTH, BOX_HEIGHT);
			//for loop to display the stairs
			double x = 1;
			double y = 1;
			
			//add(stairRect);
			
			for (int i = 0; i <= stairsValue; i++)
			{

				GRect stairRect = new GRect(x, y, BOX_WIDTH, BOX_HEIGHT);
				add(stairRect);
				System.out.println("count is " + i);
				/*x = 0;
				y = stairRect.getHeight()*2;*/
				stairRect.move(BOX_WIDTH/2,BOX_HEIGHT);
			}
		}
		
}

[Norm]

I am lost in the math of how to get the rectangles to stagger

Take a piece of graph paper (with a grid) and draw what you want the program to draw.
Look at the x,y points for each rectangle. Make a list of those x,y points. There must be an easy equation that will allow you to compute the next x,y given the current x,y.

If you need help finding the pattern, list the x,y points for the rectangles here.

[styerfoam]

Thanks for the thought!!! I figured it out. I used i to help change the location of each rectangle

x = BOX_WIDTH/2 * i;
y = BOX_HEIGHT*i;
stairRect.setLocation(x,y);