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snake.go
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snake.go
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package main
import "cart/w4"
type Point struct {
X int
Y int
}
type Snake struct {
Body []Point
Direction Point
}
func (s *Snake) Reset() {
s.Body = []Point{
{X: 7, Y: 10},
{X: 6, Y: 10},
{X: 5, Y: 10},
}
s.Direction = Point{X: 1, Y: 0}
}
func (s *Snake) Draw() {
*w4.DRAW_COLORS = 0x0043
for _, part := range s.Body {
w4.Rect(part.X*8, part.Y*8, 8, 8)
}
*w4.DRAW_COLORS = 0x0004
w4.Rect(s.Body[0].X*8, s.Body[0].Y*8, 8, 8)
}
func (s *Snake) Update() {
for i := len(s.Body) - 1; i > 0; i-- {
s.Body[i] = s.Body[i-1]
}
s.Body[0].X = (s.Body[0].X + s.Direction.X) % 20
s.Body[0].Y = (s.Body[0].Y + s.Direction.Y) % 20
if s.Body[0].X < 0 {
s.Body[0].X = 19
}
if s.Body[0].Y < 0 {
s.Body[0].Y = 19
}
}
func (s *Snake) Up() {
if s.Direction.Y == 0 {
s.Direction.X, s.Direction.Y = 0, -1
}
}
func (s *Snake) Down() {
if s.Direction.Y == 0 {
s.Direction.X, s.Direction.Y = 0, 1
}
}
func (s *Snake) Left() {
if s.Direction.X == 0 {
s.Direction.X, s.Direction.Y = -1, 0
}
}
func (s *Snake) Right() {
if s.Direction.X == 0 {
s.Direction.X, s.Direction.Y = 1, 0
}
}
func (s *Snake) IsDead() bool {
for index := 1; index < len(s.Body)-1; index++ {
if s.Body[0] == s.Body[index] {
return true
}
}
return false
}