-
Notifications
You must be signed in to change notification settings - Fork 83
/
onCollision.go
64 lines (53 loc) · 1.56 KB
/
onCollision.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
package mouse
import (
"errors"
"github.com/oakmound/oak/v2/collision"
"github.com/oakmound/oak/v2/event"
)
// CollisionPhase is a component that can be placed into another struct to
// enable PhaseCollision on the struct. See PhaseCollision.
type CollisionPhase struct {
OnCollisionS *collision.Space
wasTouching bool
}
func (cp *CollisionPhase) getCollisionPhase() *CollisionPhase {
return cp
}
type collisionPhase interface {
getCollisionPhase() *CollisionPhase
}
// PhaseCollision binds to the entity behind the space's CID so that it will
// receive MouseCollisionStart and MouseCollisionStop events, appropriately when
// the mouse begins to hover or stops hovering over the input space.
func PhaseCollision(s *collision.Space) error {
en := event.GetEntity(int(s.CID))
if cp, ok := en.(collisionPhase); ok {
oc := cp.getCollisionPhase()
oc.OnCollisionS = s
s.CID.Bind(phaseCollisionEnter, event.Enter)
return nil
}
return errors.New("This space's entity does not implement collisionPhase")
}
// MouseCollisionStart/Stop: see collision Start/Stop, for mouse collision
// Payload: (mouse.Event)
const (
Start = "MouseCollisionStart"
Stop = "MouseCollisionStop"
)
func phaseCollisionEnter(id int, nothing interface{}) int {
e := event.GetEntity(id).(collisionPhase)
oc := e.getCollisionPhase()
if oc.OnCollisionS.Contains(LastEvent.ToSpace()) {
if !oc.wasTouching {
event.CID(id).Trigger(Start, LastEvent)
oc.wasTouching = true
}
} else {
if oc.wasTouching {
event.CID(id).Trigger(Stop, LastEvent)
oc.wasTouching = false
}
}
return 0
}