fixed dependencies

vendor/gonum.org/v1/plot/vg/len.go

@@ -0,0 +1,37 @@
+// Copyright ©2015 The Gonum Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package vg
+
+import "gonum.org/v1/plot/font"
+
+// A Length is a unit-independent representation of length.
+// Internally, the length is stored in postscript points.
+type Length = font.Length
+
+// Points returns a length for the given number of points.
+func Points(pt float64) Length {
+	return font.Points(pt)
+}
+
+// Common lengths.
+const (
+	Inch       = font.Inch
+	Centimeter = font.Centimeter
+	Millimeter = font.Millimeter
+)
+
+// ParseLength parses a Length string.
+// A Length string is a possible signed floating number with a unit.
+// e.g. "42cm" "2.4in" "66pt"
+// If no unit was given, ParseLength assumes it was (postscript) points.
+// Currently valid units are:
+//
+//   - mm (millimeter)
+//   - cm (centimeter)
+//   - in (inch)
+//   - pt (point)
+func ParseLength(value string) (Length, error) {
+	return font.ParseLength(value)
+}