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path: root/main.go
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package main

import (
	"fmt"
	"time"
)

type Piece int

const (
	IPiece Piece = iota
	JPiece
	LPiece
	SPiece
	ZPiece
	TPiece
	OPiece
)

type Field [20][10]bool

func (f Field) String() (output string) {
	var toprow [10]bool
	var top bool
	for _, row := range f {
		top = !top
		for i, block := range row {
			if top {
				toprow[i] = block
				continue
			}
			switch {
			case toprow[i] && block:
				output += "\u2588"
			case toprow[i] && !block:
				output += "\u2580"
			case !toprow[i] && block:
				output += "\u2584"
			default:
				output += " "
			}
		}
		if !top {
			output += "\n"
		}
	}
	return output
}

func main() {
	var f Field
	fmt.Print("\033[2J") // Clear screen
	for i := 0; i < 200; i++ {
		if (i+i/10)%2 == 0 {
			f[i/10][i%10] = true
		}
		fmt.Print("\033[0;0H") // Position to 0,0
		fmt.Println(f.String())
		time.Sleep(time.Second/1000)
	}
}