# Lab 11: BYOW Introduction
[Prerequisites](/cs61b-fall-2022/prerequisites-to-running-the-assignments..md) to running the code.
Instructions:
Solution:
This lab served as an intro to the Tile Rendering engine which we will use to build our own world (BYOW - Build Your Own World) in Project 3.
As such, it's not really an exercise in using DS\&A, more like a tutorial on how to draw various types of tiles.
Part 1 - Meet the tile rendering engine explains how the rendering engine works.
## Part II: Use the Tile Rendering Engine
**Plus World Intro**
Above, we’ve seen how we can draw a world and generate randomness. Your task for the first half of lab is to use the tile generator we’ve seen to make a plus shape, like below.
### Implementation
```java
/**
* Draws a world consisting of plus shaped regions.
*/
public class PlusWorld {
private static final int WIDTH = 50;
private static final int HEIGHT = 50;
private static final int MAX_PLUS_SIZE = 6;
/**
* Creates a plus size of squares (of flowers) of the given size at the given coordinates
*/
private static void addPlus(TETile[][] tiles, int size, int startX, int startY) {
size = Math.min(size, MAX_PLUS_SIZE);
int centralX = startX;
int leftX = centralX - size;
int rightX = centralX + size;
int topY = startY;
int middleY = topY - size;
int bottomY = middleY - size;
//top square
addSquare(tiles, size, centralX, topY);
//middle square
addSquare(tiles, size, centralX, middleY);
//middle left square
addSquare(tiles, size, leftX, middleY);
//middle right square
addSquare(tiles, size, rightX, middleY);
//bottom square
addSquare(tiles, size, centralX, bottomY);
}
/**
* Creates a square of Flower tiles at the given coordinates
*/
private static void addSquare(TETile[][] tiles, int size, int startX, int startY) {
for (int y = startY; y <= startY + size; y++) {
for (int x = startX; x <= startX + size; x++) {
tiles[x][y] = Tileset.FLOWER;
}
}
}
public static void main(String[] args) {
TERenderer ter = new TERenderer();
ter.initialize(WIDTH, HEIGHT);
TETile[][] world = new TETile[WIDTH][HEIGHT];
for (int x = 0; x < WIDTH; x += 1) {
for (int y = 0; y < HEIGHT; y += 1) {
world[x][y] = Tileset.NOTHING;
}
}
int plusSquareSize = 3;
int startX = world[0].length / 2 - (plusSquareSize / 2);
int startY = world.length / 2 + plusSquareSize;
addPlus(world, plusSquareSize, startX, startY);
ter.renderFrame(world);
}
}
```
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