private int startX; // x value of top-left coordinate of first red block in bottom row

private int startY; // y value of top-left coordinate of first red block in bottom row

private int legoWidth; // Width of each block

private int legoHeight; // Height of each block

private int baseLength; // Max Number of blocks in a row

//Initialization of variables using constructor

public Legos1(){

super("Harshita's LEGO1 GUI application"); //Window title

this.startX = 20;

this.startY = 300;

this.legoWidth = 50;

this.legoHeight = 20;

this.baseLength = 10;

}

// drawings in the graphic

public void paint(Graphics g){

super.paint(g); // calling super class's constructor

int x,y; // x,y values to use in fillRoundRect

int counter;

//Calculating the color to fill for each row and filling it

for(int n=this.baseLength; n>0;n--){

// Update the x,y values of top left corner of each block. This is done once per row

x = this.startX + (10 - n)*(this.legoWidth/2);

y = this.startY - (10 - n)*(this.legoHeight);

counter=0; //set the counter to 0 for each row

// below loop runs for each block in a given row

while(counter<n){

//If the block is at odd numbered position, set color to fill as red, blue otherwise. Uses ternary operator

Color toFill = (counter%2 == 0) ? Color.RED : Color.BLUE;

//Set the color to the color calculated above and fill the rectangle with this color

g.setColor(toFill);

g.fillRoundRect(x, y, this.legoWidth, this.legoHeight, 2, 2);

x = x + this.legoWidth; //Update x position of top left coordinate of each block

counter++; // Update the counter

}

}

}

public static void main(String[] args) {

Legos1 app = new Legos1(); // create an instance of Legos1

app.setSize(550, 325); //set size of the application window

app.setVisible(true); //making window visible

app.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //closing the application on exit

}