38_exercise_slices.go

/*
 * Implement Pic. It should return a slice of length dy, 
 * each element of which is a slice of dx 8-bit unsigned integers. 
 * When you run the program, it will display your picture, 
 * interpreting the integers as grayscale (well, bluescale) values.
 *
 * The choice of image is up to you. Interesting functions include x^y, (x+y)/2, and x*y.
 *
 * (You need to use a loop to allocate each []uint8 inside the [][]uint8.)
 *
 * (Use uint8(intValue) to convert between types.)
 */

package main

import "code.google.com/p/go-tour/pic"

func Pic(dx, dy int) [][]uint8 {
  data := make([][]uint8, dy)
  for y := 0; y < dy; y++ {
    data[y] = make([]uint8, dx)
    for x := 0; x < dx; x++ {
      data[y][x] = uint8(x * x)    
    }
  }
  return data
}

func main() {
  pic.Show(Pic)
}