updates

continuous_series.go

@@ -0,0 +1,70 @@
+package chart
+
+import (
+	"fmt"
+
+	"github.com/blendlabs/go-util"
+)
+
+// ContinuousSeries represents a line on a chart.
+type ContinuousSeries struct {
+	Name            string
+	Style           Style
+	FinalValueLabel Style
+
+	XValues []float64
+	YValues []float64
+}
+
+// GetName returns the name of the time series.
+func (cs ContinuousSeries) GetName() string {
+	return cs.Name
+}
+
+// GetStyle returns the line style.
+func (cs ContinuousSeries) GetStyle() Style {
+	return cs.Style
+}
+
+// Len returns the number of elements in the series.
+func (cs ContinuousSeries) Len() int {
+	return len(cs.XValues)
+}
+
+// GetValue gets a value at a given index.
+func (cs ContinuousSeries) GetValue(index int) (float64, float64) {
+	return cs.XValues[index], cs.YValues[index]
+}
+
+// GetXFormatter returns the xs value formatter.
+func (cs ContinuousSeries) GetXFormatter() Formatter {
+	return func(v interface{}) string {
+		if typed, isTyped := v.(float64); isTyped {
+			return fmt.Sprintf("%0.2f", typed)
+		}
+		return util.StringEmpty
+	}
+}
+
+// GetYFormatter returns the y value formatter.
+func (cs ContinuousSeries) GetYFormatter() Formatter {
+	return cs.GetXFormatter()
+}
+
+// Render renders the series.
+func (cs ContinuousSeries) Render(c *Chart, r Renderer, canvasBox Box, xrange, yrange Range) error {
+	DrawLineSeries(c, r, canvasBox, xrange, yrange, cs)
+
+	if cs.FinalValueLabel.Show {
+		asw := 0
+		if c.Axes.Show {
+			asw = int(c.Axes.GetStrokeWidth(DefaultAxisLineWidth))
+		}
+
+		_, lv := cs.GetValue(cs.Len() - 1)
+		ll := yrange.Format(lv)
+		lx := canvasBox.Right + asw
+		ly := yrange.Translate(lv) + canvasBox.Top
+		DrawAnnotation(c, r, canvasBox, xrange, yrange, cs.FinalValueLabel, lx, ly, ll)
+	}
+}