import acm.graphics.*;
import acm.program.*;
import java.awt.*;

public class Pyramid extends GraphicsProgram {

/** Width of each brick in pixels */
	private static final int BRICK_WIDTH = 30;

/** Width of each brick in pixels */
	private static final int BRICK_HEIGHT = 12;

/** Number of bricks in the base of the pyramid */
	private static final int BRICKS_IN_BASE = 14;

	/* Draws a pyramid of the specified number of bricks, centered on the bottom of the screen. */

	public void run() {
		int rowNumber=1;		/* rowNumber is the counter to determine which row the program is drawing */
		int brickNumber=BRICKS_IN_BASE;  /* brickNumber keeps track of how many bricks are to be built in the current row */
		int yRow=(getHeight()-BRICK_HEIGHT);   /* yRow sets the y coordinate for each row, and hence each brick in the row */

		while (rowNumber<=BRICKS_IN_BASE) {
			int bricksLeftInRow=brickNumber;          /* bricksLeftInRow determines how many bricks are left to build in the row */
			int xStart=((getWidth()-BRICK_WIDTH*brickNumber)/2);    /* xStart is original x coordinate for each row of bricks */
			while (bricksLeftInRow>0) {
				int xBrick =(xStart+BRICK_WIDTH*(brickNumber-bricksLeftInRow));  /* xBrick sets x coordinate for each brick */
				GRect brick = new GRect (xBrick, yRow, BRICK_WIDTH, BRICK_HEIGHT);
				add (brick);
				bricksLeftInRow--;
			}

			rowNumber++;
			yRow-=BRICK_HEIGHT;  /* sets height for next row */
			brickNumber--;       /* sets number of bricks for next row */
		}
	}
}