8 files changed, 20 insertions, 18 deletions
diff --git a/examples/imageviewer/browser.go b/examples/imageviewer/browser.go
index cdac56f..6716918 100644
--- a/examples/imageviewer/browser.go
+++ b/examples/imageviewer/browser.go
@@ -108,7 +108,7 @@ func Browser(env gui.Env, theme *Theme, dir string, cd <-chan string, view chan<
 
 		case e, ok := <-env.Events():
 			if !ok {
-				close(env.Draw())
+				env.Close()
 				return
 			}
 
diff --git a/examples/imageviewer/button.go b/examples/imageviewer/button.go
index 0693e06..4e00287 100644
--- a/examples/imageviewer/button.go
+++ b/examples/imageviewer/button.go
@@ -58,5 +58,5 @@ func Button(env gui.Env, theme *Theme, text string, action func()) {
 		}
 	}
 
-	close(env.Draw())
+	env.Close()
 }
diff --git a/examples/imageviewer/main.go b/examples/imageviewer/main.go
index 67f97fb..10335a1 100644
--- a/examples/imageviewer/main.go
+++ b/examples/imageviewer/main.go
@@ -56,7 +56,7 @@ func run() {
 	for e := range env.Events() {
 		switch e.(type) {
 		case win.WiClose:
-			close(env.Draw())
+			env.Close()
 		}
 	}
 }
diff --git a/examples/imageviewer/splits.go b/examples/imageviewer/splits.go
index f9daf2e..93a91be 100644
--- a/examples/imageviewer/splits.go
+++ b/examples/imageviewer/splits.go
@@ -8,12 +8,16 @@ import (
 )
 
 type envPair struct {
+	env    gui.Env
 	events <-chan gui.Event
 	draw   chan<- func(draw.Image) image.Rectangle
+	impose chan<- gui.Constraint
 }
 
 func (ep *envPair) Events() <-chan gui.Event                      { return ep.events }
 func (ep *envPair) Draw() chan<- func(draw.Image) image.Rectangle { return ep.draw }
+func (ep *envPair) Impose() chan<- gui.Constraint                 { return ep.impose }
+func (ep *envPair) Close()                                        { ep.env.Close() }
 
 func FixedLeft(env gui.Env, maxX int) gui.Env {
 	out, in := gui.MakeEventsChan()
@@ -30,7 +34,7 @@ func FixedLeft(env gui.Env, maxX int) gui.Env {
 		close(in)
 	}()
 
-	return &envPair{out, env.Draw()}
+	return &envPair{env, out, env.Draw(), env.Impose()}
 }
 
 func FixedRight(env gui.Env, minX int) gui.Env {
@@ -48,7 +52,7 @@ func FixedRight(env gui.Env, minX int) gui.Env {
 		close(in)
 	}()
 
-	return &envPair{out, env.Draw()}
+	return &envPair{env, out, env.Draw(), env.Impose()}
 }
 
 func FixedTop(env gui.Env, maxY int) gui.Env {
@@ -66,7 +70,7 @@ func FixedTop(env gui.Env, maxY int) gui.Env {
 		close(in)
 	}()
 
-	return &envPair{out, env.Draw()}
+	return &envPair{env, out, env.Draw(), env.Impose()}
 }
 
 func FixedBottom(env gui.Env, minY int) gui.Env {
@@ -84,7 +88,7 @@ func FixedBottom(env gui.Env, minY int) gui.Env {
 		close(in)
 	}()
 
-	return &envPair{out, env.Draw()}
+	return &envPair{env, out, env.Draw(), env.Impose()}
 }
 
 func EvenHorizontal(env gui.Env, minI, maxI, n int) gui.Env {
@@ -103,5 +107,5 @@ func EvenHorizontal(env gui.Env, minI, maxI, n int) gui.Env {
 		close(in)
 	}()
 
-	return &envPair{out, env.Draw()}
+	return &envPair{env, out, env.Draw(), env.Impose()}
 }
diff --git a/examples/imageviewer/viewer.go b/examples/imageviewer/viewer.go
index 6f68e15..35e4081 100644
--- a/examples/imageviewer/viewer.go
+++ b/examples/imageviewer/viewer.go
@@ -50,7 +50,7 @@ func Viewer(env gui.Env, theme *Theme, view <-chan string) {
 
 		case e, ok := <-env.Events():
 			if !ok {
-				close(env.Draw())
+				env.Close()
 				return
 			}
 			if resize, ok := e.(gui.Resize); ok {
diff --git a/examples/paint/main.go b/examples/paint/main.go
index fec06c3..7aa0179 100644
--- a/examples/paint/main.go
+++ b/examples/paint/main.go
@@ -26,7 +26,7 @@ func ColorPicker(env gui.Env, pick chan<- color.Color, r image.Rectangle, clr co
 		}
 	}
 
-	close(env.Draw())
+	env.Close()
 }
 
 func Canvas(env gui.Env, pick <-chan color.Color, r image.Rectangle) {
@@ -51,7 +51,7 @@ func Canvas(env gui.Env, pick <-chan color.Color, r image.Rectangle) {
 
 		case event, ok := <-env.Events():
 			if !ok {
-				close(env.Draw())
+				env.Close()
 				return
 			}
 
@@ -118,7 +118,7 @@ func run() {
 	for event := range env.Events() {
 		switch event.(type) {
 		case win.WiClose:
-			close(env.Draw())
+			env.Close()
 		}
 	}
 }
diff --git a/examples/pexeso/main.go b/examples/pexeso/main.go
index 56bd6e6..f990951 100644
--- a/examples/pexeso/main.go
+++ b/examples/pexeso/main.go
@@ -90,7 +90,7 @@ func Tile(env gui.Env, pair chan PairMsg, r image.Rectangle, clr color.Color) {
 				}
 
 				if correct {
-					close(env.Draw())
+					env.Close()
 					return
 				}
 
@@ -144,7 +144,7 @@ func run() {
 	for event := range env.Events() {
 		switch event.(type) {
 		case win.WiClose:
-			close(env.Draw())
+			env.Close()
 		}
 	}
 }
diff --git a/len_test.go b/len_test.go
index 91b0886..269f90c 100644
--- a/len_test.go
+++ b/len_test.go
@@ -2,15 +2,13 @@ package gui_test
 
 import (
 	"fmt"
-	"image"
 
 	"github.com/faiface/gui"
 )
 
 func ExampleRelative() {
-	var l Length = Relative(0.10)   // 10%
-	r := image.Rect(0, 0, 100, 100) // 100x100 rectangle
-	fmt.Println(l.Px(r))
+	var l gui.Length = gui.Relative(0.10) // 10%
+	fmt.Println(l.Px(100))
 	// Output:
 	// 10
 }