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Writing a Text Adventure Game in Go - Part 1 (uses a *Location for Game.CurrentLocation)
package main
import (
"fmt"
"math/rand"
"time"
)
type Game struct {
Welcome string
Health int
CurrentLocation *Location
}
func (g *Game) Play() {
fmt.Println(g.Welcome)
for {
fmt.Println(g.CurrentLocation.Description)
g.ProcessEvents(g.CurrentLocation.Events)
if g.Health <= 0 {
fmt.Println("You are dead, game over!!!")
return
}
fmt.Printf("Health: %d\n", g.Health)
fmt.Println("You can go to these places:")
for index, loc := range g.CurrentLocation.Transitions {
fmt.Printf("\t%s - %s\n", index, loc.Name)
}
var name string
fmt.Print("Where do you want to go? (0 - to quit) ")
_, err := fmt.Scan(&name)
if err != nil { fmt.Println(err); return }
var newLoc *Location
if v, ok := g.CurrentLocation.Transitions[name]; ok {
newLoc = v
} else if name == "0" { return }
if newLoc != nil {
g.CurrentLocation = newLoc
}
}
}
func (g *Game) ProcessEvents(events []string) {
for _, evtName := range events {
g.Health += evts[evtName].ProcessEvent()
}
}
type Event struct {
Type string
Chance int
Description string
Health int
Evt string
}
func (e *Event) ProcessEvent() int {
s1 := rand.NewSource(time.Now().UnixNano())
r1 := rand.New(s1)
if e.Chance >= r1.Intn(100) {
hp := e.Health
if e.Type == "Combat" {
fmt.Println("Combat Event")
}
fmt.Printf("\t%s\n", e.Description)
if e.Evt != "" {
hp = hp + evts[e.Evt].ProcessEvent()
}
return hp
}
return 0
}
type Location struct {
Name string
Description string
Transitions map[string]*Location
Events []string
}
var evts = map[string]*Event{
"alienAttack": {Type: "Combat", Chance: 20, Description: "An alien beams in front of you and shoots you with a ray gun.", Health: -50, Evt: "doctorTreatment"},
"doctorTreatment": {Type: "Story", Chance: 10, Description: "The doctor rushes in and inject you with a health boost.", Health: +30, Evt: ""},
"android": {Type: "Story", Chance: 50, Description: "Data is in the turbo lift and says hi to you", Health: 0, Evt: ""},
"relaxing": {Type: "Story", Chance: 100, Description: "In the lounge you are so relaxed that your health improves.", Health: +10, Evt: ""},
}
var bridge *Location
func init() {
bridge = &Location{
Name: "Bridge",
Description: "You are on the bridge of a spaceship sitting in the Captain's chair.",
Events: []string{"alienAttack"},
}
rr := &Location{
Name: "Ready Room",
Description: "The Captain's ready room.",
Transitions: map[string]*Location{"bridge": bridge},
Events: []string{"doctorTreatment"}}
bridge.Transitions = map[string]*Location{"ready": rr}
bridge.Transitions["lift"] = &Location{
Name: "Turbo Lift",
Description: "A Turbo Lift that takes you anywhere in the ship.",
Events: []string{"android"},
}
bridge.Transitions["lift"].Transitions = map[string]*Location{
"bridge": bridge,
"engineering": {
Name: "Engineering",
Description: "You are in engineering where you see the star drive",
Events: []string{"alienAttack"},
Transitions: map[string]*Location{"lift": bridge.Transitions["lift"]},
},
"lounge": {
Name: "Lounge",
Description: "You are in the lounge, you feel very relaxed",
Events: []string{"relaxing"},
Transitions: map[string]*Location{"lift": bridge.Transitions["lift"]},
},
}
}
func main() {
g := &Game{
Health: 100,
Welcome: "Welcome to the Starship Enterprise\n\n",
CurrentLocation: bridge,
}
g.Play()
}
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