make Env an interface (instead of a struct)

1 files changed, 3 insertions, 3 deletions

diff --git a/env.go b/env.go
index cd71b5b..c1800d6 100644
--- a/env.go
+++ b/env.go
@@ -5,7 +5,7 @@ import (
 	"image/draw"
 )
 
-type Env struct {
-	Events <-chan Event
-	Draw   chan<- func(draw.Image) image.Rectangle
+type Env interface {
+	Events() <-chan Event
+	Draw() chan<- func(draw.Image) image.Rectangle
 }