pulling generate grid lines into its own function

yaxis.go

@@ -71,33 +71,7 @@ func (ya YAxis) GetGridLines(ticks []Tick) []GridLine {
 	if len(ya.GridLines) > 0 {
 		return ya.GridLines
 	}
-	return ya.generateGridLines(ticks)
-}
-
-func (ya YAxis) generateGridLines(ticks []Tick) []GridLine {
-	var gl []GridLine
-	isMinor := false
-	minorStyle := Style{
-		StrokeColor: DefaultGridLineColor.WithAlpha(100),
-		StrokeWidth: 1.0,
-	}
-	majorStyle := Style{
-		StrokeColor: DefaultGridLineColor,
-		StrokeWidth: 1.0,
-	}
-	for _, t := range ticks {
-		s := majorStyle
-		if isMinor {
-			s = minorStyle
-		}
-		gl = append(gl, GridLine{
-			Style:   s,
-			IsMinor: isMinor,
-			Value:   t.Value,
-		})
-		isMinor = !isMinor
-	}
-	return gl
+	return GenerateGridLines(ticks, false)
 }
 
 // Measure returns the bounds of the axis.