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package main
import (
"fmt"
"github.com/pkg/term"
)
type PieceType int
const (
IPiece PieceType = iota
JPiece
LPiece
SPiece
ZPiece
TPiece
OPiece
)
type Point struct {
X, Y int
}
type Piece struct {
Type PieceType
RelX int
RelY int
Layout []Point
Lock int
}
type Bag []Piece
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
}
// GetKey() returns the key currently pressed. It always returns a 3 byte slice. Check first element for Escape for handling arrow keys
// Because a defer would trigger too late and the Restore and Close are essential, separated in a function.
func GetKey() []byte {
t, _ := term.Open("/dev/tty")
term.RawMode(t)
key := make([]byte, 3)
t.Read(key)
t.Restore()
t.Close()
return key
}
func main() {
var f Field
fmt.Print("\033[2J") // Clear screen
p := Point{}
var oldp Point
for {
fmt.Print("\033[2J") // Clear screen
f[oldp.Y][oldp.X] = false
oldp = p
f[p.Y][p.X] = true
fmt.Print("\033[0;0H") // Position to 0,0
fmt.Println(f.String())
key := GetKey()
switch key[0] {
case 27: // Escape, read the arrow key pressed
switch key[2] {
case 65: // Up
p.Y = (p.Y + 20 - 1)%20
case 66: // Down
p.Y = (p.Y + 20 + 1)%20
case 67: // Right
p.X = (p.X + 10 + 1)%10
case 68: // Left
p.X = (p.X + 10 - 1)%10
default:
fmt.Println("...escape, escape!")
return
}
case 'q':
fmt.Println("...that was exciting!")
return
default:
if key[0] != 0 {
fmt.Print(string(key[0]))
}
}
}
}
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