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133 lines
2.8 KiB
Go

package main
import (
"bytes"
"fmt"
"text/template"
"time"
)
type TravelState struct {
CommandSuite
start *System
dest *System
travelled float64 // distance traveled so far in parsecs
dist float64 // distance between start and end in parsecs
}
func NewTravel(c *Connection, start, dest *System) ConnectionState {
t := &TravelState{
start: start,
dest: dest,
dist: start.DistanceTo(dest),
}
t.CommandSuite = CommandSet{
playersCommand,
balCommand,
Command{
name: "progress",
summary: "displays how far you are along your travel",
arity: 0,
handler: t.progress,
},
Command{
name: "eta",
summary: "displays estimated time of arrival",
arity: 0,
handler: func(c *Connection, args ...string) {
c.Printf("%v\n", t.remaining())
},
},
}
return t
}
var enterTravelTemplate = template.Must(template.New("enter-travel").Parse(`
Departing: {{.Departing}}
Destination: {{.Destination}}
Total Trip Time: {{.Duration}}
`))
func (t *TravelState) Enter(c *Connection) {
enterTravelTemplate.Execute(c, struct {
Departing *System
Destination *System
Duration time.Duration
}{
t.start,
t.dest,
t.tripTime(),
})
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t.start.Leave(c)
}
func (t *TravelState) Tick(c *Connection, frame int64) ConnectionState {
dt := options.playerSpeed * options.lightSpeed
segmentLength := t.dist / 18
x := t.travelled
for x > segmentLength {
x -= segmentLength
}
if x < dt {
c.Printf("%v", t.start.name)
var buf bytes.Buffer
segment := int(t.travelled / t.dist * 18)
buf.WriteRune('|')
for i := 0; i < 18; i++ {
switch {
case i == segment:
buf.WriteRune('>')
case i == segment-1:
buf.WriteRune('=')
case i < segment:
buf.WriteRune('-')
default:
buf.WriteRune(' ')
}
}
buf.WriteRune('|')
c.Write(buf.Bytes())
c.Printf("at %v in %v\n", t.dest.name, t.remaining())
}
t.travelled += dt
if t.travelled >= t.dist {
return Idle(t.dest)
}
return t
}
func (t *TravelState) Exit(c *Connection) {
c.Printf("You have arrived at %v.\n", t.dest)
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t.dest.Arrive(c)
}
func (t *TravelState) String() string {
return fmt.Sprintf("Traveling from %v to %v", t.start, t.dest)
}
func (t *TravelState) FillStatus(c *Connection, s *status) {
s.Location = fmt.Sprintf("between %s and %s", t.start, t.dest)
}
func (t *TravelState) progress(c *Connection, args ...string) {
c.Printf("%v\n", t.travelled/t.dist)
}
func (t *TravelState) remaining() time.Duration {
remaining := t.dist - t.travelled
frames := remaining / (options.playerSpeed * options.lightSpeed)
return framesToDur(int64(frames))
}
func (t *TravelState) eta() time.Time {
// distance remaining in parsecs
return time.Now().Add(t.remaining())
}
func (t *TravelState) tripTime() time.Duration {
frames := t.dist / (options.playerSpeed * options.lightSpeed)
return framesToDur(int64(frames))
}