103 lines
2.3 KiB
Go
103 lines
2.3 KiB
Go
package game
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import (
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"fmt"
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"github.com/google/uuid"
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)
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// World describes a self contained universe and everything in it
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type World struct {
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// Instances is a map of all the instances in the game
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Instances map[uuid.UUID]Instance `json:"instances"`
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}
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// Instance describes a single entity or instance of an entity in the world
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type Instance struct {
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// Id is a unique ID for this instance
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Id uuid.UUID `json:"id"`
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// Pos represents where this instance is in the world
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Pos Vector `json:"pos"`
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// Speed represents the Speed that the instance will move per second
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Speed float64 `json:"speed"`
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// Sight represents the distance the unit can see
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Sight float64 `json:"sight"`
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}
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// NewWorld creates a new world object
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func NewWorld() *World {
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return &World{
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Instances: make(map[uuid.UUID]Instance),
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}
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}
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// Spawn adds an instance to the game
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func (w *World) Spawn(id uuid.UUID) error {
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if _, ok := w.Instances[id]; ok {
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return fmt.Errorf("instance with id %s already exists in world", id)
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}
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// Initialise the instance
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instance := Instance{
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Id: id,
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}
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// Append the instance to the list
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w.Instances[id] = instance
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return nil
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}
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// Removes an instance from the game
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func (w *World) DestroyInstance(id uuid.UUID) error {
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if _, ok := w.Instances[id]; ok {
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delete(w.Instances, id)
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} else {
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return fmt.Errorf("no instance matching id")
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}
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return nil
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}
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// GetPosition returns the position of a given instance
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func (w World) GetPosition(id uuid.UUID) (Vector, error) {
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if i, ok := w.Instances[id]; ok {
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return i.Pos, nil
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} else {
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return Vector{}, fmt.Errorf("no instance matching id")
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}
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}
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// SetPosition sets an instances position
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func (w *World) SetPosition(id uuid.UUID, pos Vector) error {
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if i, ok := w.Instances[id]; ok {
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i.Pos = pos
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w.Instances[id] = i
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return nil
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} else {
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return fmt.Errorf("no instance matching id")
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}
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}
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// SetPosition sets an instances position
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func (w *World) MovePosition(id uuid.UUID, vec Vector) (Vector, error) {
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if i, ok := w.Instances[id]; ok {
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i.Pos.Add(vec)
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w.Instances[id] = i
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return i.Pos, nil
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} else {
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return Vector{}, fmt.Errorf("no instance matching id")
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}
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}
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// Execute will run the commands given
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func (w *World) Execute(commands ...Command) error {
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for _, c := range commands {
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if err := c(); err != nil {
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return err
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}
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}
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return nil
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}
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