File: fractal.um

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/*
 https://github.com/vtereshkov/umka-lang/raw/master/examples/fractal/fractal.um
*/
// Fractal demo in Umka (adapted from a Wren version by Robert Nystrom)

fn main() {
    const (
        yMin = -0.2
        yMax =  0.1
        xMin = -1.5
        xMax = -1.1
    )

    for yPixel := 0; yPixel < 40; yPixel++ {
      y0 := (yPixel / 40.0) * (yMax - yMin) + yMin
      
      for xPixel := 0; xPixel < 79; xPixel++ {
        x0 := (xPixel / 78.0) * (xMax - xMin) + xMin
        x, y := x0, y0
        pixel := ' '       
        
        for iter := 0; iter < 80; iter++ {
          x, y = x * x - y * y + x0, 2 * x * y + y0

          // Stop if the point escaped
          if x * x + y * y > 4 {
            const pixels = " .:;+=xX$&"
            pixel = pixels[iter / 8]
            break
          }
        }

        printf("%c", pixel)
      }

      printf("\n")
    }
}