Creates a checkerboard from a text description

colortiles.groovy

import java.awt.Color
import java.awt.Graphics2D
import java.awt.image.BufferedImage
import javax.imageio.ImageIO

Red = new Color(255, 0, 0)
Green = new Color(0, 255, 0)
Blue = new Color(0, 0, 255)
Orange = new Color(255, 165, 0)
Yellow = new Color(255, 255, 0)
Pink = new Color(255, 192, 203)

grid = '''B O R O Y
O R B G R
B O G O Y
Y G B Y G
R O R B R'''

def gridToMatrix(grid) {
    def rows = []
    def sgrid = new Scanner(grid)
    while(sgrid.hasNextLine()){
        def line = sgrid.nextLine()
        def sline = new Scanner(line)
        def row = []
        rows << row
        while(sline.hasNext()){
            row << sline.next()
        }
    }
    rows
}

def tileToColor(tile) {
    switch(tile) {
    case "R": return Red
    case "G": return Green
    case "B": return Blue
    case "O": return Orange
    case "Y": return Yellow
    case "P": return Pink
    default:
        throw new IllegalArgumentException("Unknown color: " + tile)
    }
}

mat = gridToMatrix(grid)
rows = mat.size()
cols = mat[0].size()
tileWidth = 100
tileHeight = 100
println(mat)

width = tileWidth * cols
height = tileHeight * rows
BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB)
g = bi.createGraphics();

g.setBackground()
y = 0
mat.each {row ->
    x = 0
    row.each {tile ->
        g.setPaint(tileToColor(tile))
        printf("Drawing to %d %d\n", x, y)
        g.fillRect(x, y, tileWidth, tileHeight)
        x+=tileWidth
    }
    y+=tileHeight
}

ImageIO.write(bi, "PNG", new File("colormaze.png"))