axis labels!

range.go

@@ -3,13 +3,16 @@ package chart
 import (
 	"fmt"
 	"math"
+
+	"github.com/blendlabs/go-util"
 )
 
 // Range represents a continuous range,
 type Range struct {
-	Min    float64
-	Max    float64
-	Domain int
+	Min       float64
+	Max       float64
+	Domain    int
+	Formatter Formatter
 }
 
 // IsZero returns if the range has been set or not.
@@ -27,6 +30,14 @@ func (r Range) String() string {
 	return fmt.Sprintf("Range [%.2f,%.2f] => %d", r.Min, r.Max, r.Domain)
 }
 
+// Format formats the value based on the range's formatter.
+func (r Range) Format(v interface{}) string {
+	if r.Formatter != nil {
+		return r.Formatter(v)
+	}
+	return util.StringEmpty
+}
+
 // Translate maps a given value into the range space.
 // An example would be a 600 px image, with a min of 10 and a max of 100.
 // Translate(50) would yield (50.0/90.0)*600 ~= 333.33