updates.

chart.go

@@ -199,20 +199,21 @@ func (c Chart) drawSeries(r Renderer, s Series) {
 		return
 	}
 
-	v0 := s.GetValue(0)
-	x0 := xrange.Translate(v0.X)
-	y0 := yrange.Translate(v0.Y)
+	v0x, v0y := s.GetValue(0)
+	x0 := xrange.Translate(v0x)
+	y0 := yrange.Translate(v0y)
 	r.MoveTo(x0, y0)
 
-	var v Point
+	var vx interface{}
+	var vy float64
 	var x, y int
 	for index := 0; index < s.Len(); index++ {
-		v = s.GetValue(0)
-		x = xrange.Translate(v.X)
-		y = yrange.Translate(v.Y)
+		vx, vy = s.GetValue(index)
+		x = xrange.Translate(vx)
+		y = yrange.Translate(vy)
 		r.LineTo(x, y)
 	}
-	r.FillStroke()
+	r.Stroke()
 }
 
 func (c Chart) drawTitle(r Renderer) error {

raster_renderer.go

@@ -34,46 +34,55 @@ type rasterRenderer struct {
 
 // SetStrokeColor implements the interface method.
 func (rr *rasterRenderer) SetStrokeColor(c color.RGBA) {
+	println("SetStrokeColor")
 	rr.gc.SetStrokeColor(c)
 }
 
 // SetFillColor implements the interface method.
 func (rr *rasterRenderer) SetFillColor(c color.RGBA) {
+	println("SetFillColor")
 	rr.gc.SetFillColor(c)
 }
 
 // SetLineWidth implements the interface method.
 func (rr *rasterRenderer) SetLineWidth(width int) {
+	println("SetLineWidth", width)
 	rr.gc.SetLineWidth(float64(width))
 }
 
 // MoveTo implements the interface method.
 func (rr *rasterRenderer) MoveTo(x, y int) {
+	println("MoveTo", x, y)
 	rr.gc.MoveTo(float64(x), float64(y))
 }
 
 // LineTo implements the interface method.
 func (rr *rasterRenderer) LineTo(x, y int) {
+	println("LineTo", x, y)
 	rr.gc.LineTo(float64(x), float64(y))
 }
 
 // Close implements the interface method.
 func (rr *rasterRenderer) Close() {
+	println("Close")
 	rr.gc.Close()
 }
 
 // Stroke implements the interface method.
 func (rr *rasterRenderer) Stroke() {
+	println("Stroke")
 	rr.gc.Stroke()
 }
 
 // FillStroke implements the interface method.
 func (rr *rasterRenderer) FillStroke() {
+	println("FillStroke")
 	rr.gc.FillStroke()
 }
 
 // Circle implements the interface method.
 func (rr *rasterRenderer) Circle(radius float64, x, y int) {
+	println("Circle", radius, x, y)
 	xf := float64(x)
 	yf := float64(y)
 	rr.gc.MoveTo(xf-radius, yf)              //9
@@ -87,29 +96,34 @@ func (rr *rasterRenderer) Circle(radius float64, x, y int) {
 
 // SetFont implements the interface method.
 func (rr *rasterRenderer) SetFont(f *truetype.Font) {
+	println("SetFont")
 	rr.font = f
 	rr.gc.SetFont(f)
 }
 
 // SetFontSize implements the interface method.
 func (rr *rasterRenderer) SetFontSize(size float64) {
+	println("SetFontSize", size)
 	rr.fontSize = size
 	rr.gc.SetFontSize(size)
 }
 
 // SetFontColor implements the interface method.
 func (rr *rasterRenderer) SetFontColor(c color.RGBA) {
+	println("SetFontColor")
 	rr.fontColor = c
 	rr.gc.SetStrokeColor(c)
 }
 
 // Text implements the interface method.
 func (rr *rasterRenderer) Text(body string, x, y int) {
+	println("Text", body, x, y)
 	rr.gc.CreateStringPath(body, float64(x), float64(y))
 }
 
 // MeasureText implements the interface method.
 func (rr *rasterRenderer) MeasureText(body string) int {
+	println("MeasureText", body)
 	if rr.fc == nil && rr.font != nil {
 		rr.fc = &font.Drawer{
 			Face: truetype.NewFace(rr.font, &truetype.Options{
@@ -127,5 +141,6 @@ func (rr *rasterRenderer) MeasureText(body string) int {
 
 // Save implements the interface method.
 func (rr *rasterRenderer) Save(w io.Writer) error {
+	println("Save")
 	return png.Encode(w, rr.i)
 }

series.go

@@ -7,7 +7,7 @@ type Series interface {
 	GetName() string
 	GetStyle() Style
 	Len() int
-	GetValue(index int) Point
+	GetValue(index int) (interface{}, float64)
 
 	GetXRange(domain int) Range
 	GetYRange(domain int) Range
@@ -48,8 +48,8 @@ func (ts TimeSeries) GetYRange(domain int) Range {
 }
 
 // GetValue gets a value at a given index.
-func (ts TimeSeries) GetValue(index int) Point {
-	return Point{X: float64(ts.XValues[index].Unix()), Y: ts.YValues[index]}
+func (ts TimeSeries) GetValue(index int) (interface{}, float64) {
+	return ts.XValues[index], ts.YValues[index]
 }
 
 // ContinousSeries represents a line on a chart.
@@ -77,8 +77,8 @@ func (cs ContinousSeries) Len() int {
 }
 
 // GetValue gets a value at a given index.
-func (cs ContinousSeries) GetValue(index int) Point {
-	return Point{X: cs.XValues[index], Y: cs.YValues[index]}
+func (cs ContinousSeries) GetValue(index int) (interface{}, float64) {
+	return cs.XValues[index], cs.YValues[index]
 }
 
 // GetXRange returns the x range.

series_test.go

@@ -1 +1,56 @@
 package chart
+
+import (
+	"testing"
+	"time"
+
+	"github.com/blendlabs/go-assert"
+)
+
+func TestTimeSeriesGetValue(t *testing.T) {
+	assert := assert.New(t)
+
+	ts := TimeSeries{
+		Name: "Test",
+		XValues: []time.Time{
+			time.Now().AddDate(0, 0, -5),
+			time.Now().AddDate(0, 0, -4),
+			time.Now().AddDate(0, 0, -3),
+			time.Now().AddDate(0, 0, -2),
+			time.Now().AddDate(0, 0, -1),
+		},
+		YValues: []float64{
+			1.0, 2.0, 3.0, 4.0, 5.0,
+		},
+	}
+
+	x0, y0 := ts.GetValue(0)
+	assert.NotZero(x0)
+	assert.Equal(1.0, y0)
+}
+
+func TestTimeSeriesRanges(t *testing.T) {
+	assert := assert.New(t)
+
+	ts := TimeSeries{
+		Name: "Test",
+		XValues: []time.Time{
+			time.Now().AddDate(0, 0, -5),
+			time.Now().AddDate(0, 0, -4),
+			time.Now().AddDate(0, 0, -3),
+			time.Now().AddDate(0, 0, -2),
+			time.Now().AddDate(0, 0, -1),
+		},
+		YValues: []float64{
+			1.0, 2.0, 3.0, 4.0, 5.0,
+		},
+	}
+
+	xrange := ts.GetXRange(1000)
+	x0 := xrange.Translate(time.Now().AddDate(0, 0, -3))
+	assert.Equal(500, x0)
+
+	yrange := ts.GetYRange(400)
+	y0 := yrange.Translate(3.0)
+	assert.Equal(200, y0)
+}