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package main
import (
"fmt"
"os"
"syscall"
"unsafe"
)
func terminalSize() (cols int, lines int, err error) {
const tiocgwinsz uintptr = 21523
ts := new(struct {
wsRow, wsCol, wsXPixel, wsYPixel uint16
})
if _, _, err := syscall.Syscall(syscall.SYS_IOCTL, 1, tiocgwinsz, uintptr(unsafe.Pointer(ts))); err != 0 {
return 0, 0, err
}
return int(ts.wsCol), int(ts.wsRow), nil
}
func mandelbrot(x0, y0 float64) int {
var x, y, x2, y2 float64
for i := 0; i < 1000; i++ {
if x2+y2 > 4 {
return (i-1)%6 + 1
}
y = (x+x)*y + y0
x = x2 - y2 + x0
x2 = x * x
y2 = y * y
}
return 0
}
func main() {
const (
xMin = -2.
xRange = 2.47
yMin = -1.12
yRange = 2.24
)
width, height, err := terminalSize()
if err != nil {
fmt.Fprintln(os.Stderr, err)
os.Exit(1)
}
xStep := xRange / float64(width)
yStep := yRange / float64(height)
y := yMin
for i := 0; i < height; i++ {
x := xMin
for j := 0; j < width; j++ {
fmt.Printf("\033[4%dm ", mandelbrot(x, y))
x += xStep
}
fmt.Println("\033[49m")
y += yStep
}
}
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