diff --git a/cmd/testpostscript.go b/cmd/testpostscript.go
index 24b83e0..81d8736 100644
--- a/cmd/testpostscript.go
+++ b/cmd/testpostscript.go
@@ -46,7 +46,7 @@ func main() {
 	lastTime := time.Nanoseconds()
 	src, err := os.Open("../resource/postscript/Mand.ps", 0, 0)
 	if err != nil {
-		return 
+		return
 	}
 	defer src.Close()
 	bytes, err := ioutil.ReadAll(src)
diff --git a/draw2d/gc.go b/draw2d/gc.go
index 8ff6d30..94ab547 100644
--- a/draw2d/gc.go
+++ b/draw2d/gc.go
@@ -44,4 +44,4 @@ type GraphicContext interface {
 	Stroke(paths ...*PathStorage)
 	Fill(paths ...*PathStorage)
 	FillStroke(paths ...*PathStorage)
-}
\ No newline at end of file
+}
diff --git a/draw2d/vertex2d.go b/draw2d/vertex2d.go
index 3822fcc..c544cd5 100644
--- a/draw2d/vertex2d.go
+++ b/draw2d/vertex2d.go
@@ -15,4 +15,4 @@ const (
 type VertexConverter interface {
 	NextCommand(cmd VertexCommand)
 	Vertex(x, y float64)
-}
\ No newline at end of file
+}