minor changes

Pat3ickI · Feb 28, 2017 · 7f7912c · 7f7912c
1 parent d598e68
commit 7f7912c
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Showing 2 changed files with 2 additions and 2 deletions.
diff --git a/batch.go b/batch.go
@@ -128,7 +128,7 @@ func (bp *batchPicture) Slice(r Rect) Picture {
 func (bp *batchPicture) Draw(t TargetTriangles) {
  bt := t.(*batchTriangles)
  if bp.b != bt.b {
- panic(fmt.Sprintf("%T.Draw: TargetTriangles generated by different Batch", bp))
+ panic(fmt.Errorf("%T.Draw: TargetTriangles generated by different Batch", bp))
  }
  bt.draw(bp)
 }
diff --git a/interface.go b/interface.go
@@ -127,7 +127,7 @@ type TargetPicture interface {
 // PictureColor specifies Picture with Color property, so that every position inside the Picture's
 // Bounds has a color.
 //
-// Positions outside the Picture's Bounds must return opaque white (NRGBA{R: 1, G: 1, B:1, A: 1}).
+// Positions outside the Picture's Bounds must return transparent black (NRGBA{R: 0, G: 0, B: 0, A: 0}).
 type PictureColor interface {
  Picture
  Color(at Vec) NRGBA