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88 lines
1.5 KiB
Go
88 lines
1.5 KiB
Go
package sim
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import (
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"time"
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"github.com/jordanorelli/astro-domu/internal/math"
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)
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type entity struct {
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ID int `json:"id"`
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Position math.Vec `json:"pos"`
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Glyph rune `json:"glyph"`
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name string
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description string
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solid bool `json:"-"`
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overlapped map[int]*entity
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pickupable bool
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behavior
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}
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func (e *entity) overlapping(others ...*entity) {
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idx := make(map[int]*entity, len(others))
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for i, _ := range others {
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e2 := others[i]
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if e2 == e {
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continue
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}
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idx[e2.ID] = e2
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}
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for _, e2 := range e.overlapped {
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if idx[e2.ID] == nil {
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e.stopOverlap(e2)
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}
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}
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for _, e2 := range idx {
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e.overlap(e2)
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}
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e.overlapped = idx
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}
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func (e *entity) overlap(e2 *entity) {
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if e.overlapped == nil {
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e.overlapped = make(map[int]*entity, 4)
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}
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type overlapStarter interface {
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onStartOverlap(*entity)
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}
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if e.behavior != nil && e.overlapped[e2.ID] == nil {
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if b, ok := e.behavior.(overlapStarter); ok {
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b.onStartOverlap(e2)
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}
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}
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type overlapper interface {
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onOverlap(*entity)
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}
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if e.behavior != nil {
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if b, ok := e.behavior.(overlapper); ok {
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b.onOverlap(e2)
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}
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}
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}
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func (e *entity) stopOverlap(e2 *entity) {
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type overlapStopper interface {
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onStopOverlap(*entity)
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}
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if e.behavior != nil {
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if b, ok := e.behavior.(overlapStopper); ok {
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b.onStopOverlap(e2)
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}
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}
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}
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type behavior interface {
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// update is the standard tick function
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update(*entity, time.Duration)
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}
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type doNothing struct{}
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func (d doNothing) update(*entity, time.Duration) {}
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