/* TODO: Replace these file comments with a description of what your program
 * does.
 */
import acm.graphics.*;
import acm.program.*;

public class Pyramid extends GraphicsProgram {
    /** Width of each brick in pixels */
    private static final double BRICK_WIDTH = 30;

    /** Height of each brick in pixels */
    private static final double BRICK_HEIGHT = 12;

    /** Number of bricks in the base of the pyramid */
    private static final int BRICKS_IN_BASE = 20;
    
    /** Coordinates of the bricks in the leftmost every row*/
    private static double originalX,originalY;
    
    
    public void run() {
        for(int i=BRICKS_IN_BASE;i>0;i--){
            createBrickRow(i);
        }
    }

    // create a row of bricks
    private void createBrickRow(int i) {
    
        //First get the original coordinates
        getOriginalCoordinate(i);
        
        //Then create a row of bricks;
        for(int j=0;j<i;j++){
            double x,y;
            x = originalX + j * BRICK_WIDTH;
            y = originalY;
            GRect brick = new GRect(x,y,BRICK_WIDTH,BRICK_HEIGHT);
            add(brick);
        }
    }

    private void getOriginalCoordinate(int i) {
        // get the original coordinates(x,y);
        originalX = (getWidth() - i*BRICK_WIDTH)/2;
        originalY = getHeight() - (BRICKS_IN_BASE -i)*BRICK_HEIGHT;
    }
}