you can now fill series.

chart.go

@@ -333,24 +333,43 @@ func (c Chart) drawXAxisLabels(r Renderer, canvasBox Box, xrange Range) {
 }
 
 func (c Chart) drawSeries(r Renderer, canvasBox Box, index int, s Series, xrange, yrange Range) {
-	r.SetStrokeColor(s.GetStyle().GetStrokeColor(GetDefaultSeriesStrokeColor(index)))
-	r.SetStrokeWidth(s.GetStyle().GetStrokeWidth(DefaultStrokeWidth))
-
 	if s.Len() == 0 {
 		return
 	}
 
 	cx := canvasBox.Left
 	cy := canvasBox.Top
+	cb := canvasBox.Bottom
 	cw := canvasBox.Width
 
 	v0x, v0y := s.GetValue(0)
 	x0 := cw - xrange.Translate(v0x)
 	y0 := yrange.Translate(v0y)
-	r.MoveTo(x0+cx, y0+cy)
 
 	var vx, vy float64
 	var x, y int
+
+	fill := s.GetStyle().GetFillColor()
+	if !ColorIsZero(fill) {
+		r.SetFillColor(fill)
+		r.MoveTo(x0+cx, y0+cy)
+		for i := 1; i < s.Len(); i++ {
+			vx, vy = s.GetValue(i)
+			x = cw - xrange.Translate(vx)
+			y = yrange.Translate(vy)
+			r.LineTo(x+cx, y+cy)
+		}
+		r.LineTo(x+cx, cb)
+		r.LineTo(x0+cx, cb)
+		r.Close()
+		r.Fill()
+	}
+
+	stroke := s.GetStyle().GetStrokeColor(GetDefaultSeriesStrokeColor(index))
+	r.SetStrokeColor(stroke)
+	r.SetStrokeWidth(s.GetStyle().GetStrokeWidth(DefaultStrokeWidth))
+
+	r.MoveTo(x0+cx, y0+cy)
 	for i := 1; i < s.Len(); i++ {
 		vx, vy = s.GetValue(i)
 		x = cw - xrange.Translate(vx)

style.go

@@ -4,6 +4,8 @@ import (
 	"fmt"
 	"image/color"
 	"strings"
+
+	"github.com/wcharczuk/go-chart/drawing"
 )
 
 // Style is a simple style set.
@@ -28,7 +30,7 @@ func (s Style) GetStrokeColor(defaults ...color.RGBA) color.RGBA {
 		if len(defaults) > 0 {
 			return defaults[0]
 		}
-		return DefaultStrokeColor
+		return color.RGBA{}
 	}
 	return s.StrokeColor
 }
@@ -39,7 +41,7 @@ func (s Style) GetFillColor(defaults ...color.RGBA) color.RGBA {
 		if len(defaults) > 0 {
 			return defaults[0]
 		}
-		return DefaultFillColor
+		return color.RGBA{}
 	}
 	return s.FillColor
 }
@@ -72,13 +74,13 @@ func (s Style) GetFontColor(defaults ...color.RGBA) color.RGBA {
 		if len(defaults) > 0 {
 			return defaults[0]
 		}
-		return DefaultTextColor
+		return color.RGBA{}
 	}
 	return s.FontColor
 }
 
 // SVG returns the style as a svg style string.
-func (s Style) SVG() string {
+func (s Style) SVG(dpi float64) string {
 	sw := s.StrokeWidth
 	sc := s.StrokeColor
 	fc := s.FillColor
@@ -102,7 +104,7 @@ func (s Style) SVG() string {
 
 	fontSizeText := ""
 	if fs != 0 {
-		fontSizeText = "font-size:" + fmt.Sprintf("%.1fpx", fs)
+		fontSizeText = "font-size:" + fmt.Sprintf("%.1fpx", drawing.PointsToPixels(dpi, fs))
 	}
 
 	if !ColorIsZero(fnc) {

testserver/main.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"image/color"
 	"log"
 	"net/http"
 
@@ -23,7 +24,8 @@ func chartHandler(rc *web.RequestContext) web.ControllerResult {
 	c := chart.Chart{
 		Title: "A Test Chart",
 		TitleStyle: chart.Style{
-			Show: true,
+			Show:     true,
+			FontSize: 26.0,
 		},
 		Width:  640,
 		Height: 480,
@@ -43,6 +45,9 @@ func chartHandler(rc *web.RequestContext) web.ControllerResult {
 				Name:    "a",
 				XValues: []float64{1.0, 2.0, 3.0, 4.0},
 				YValues: []float64{2.5, 5.0, 2.0, 3.3},
+				Style: chart.Style{
+					FillColor: color.RGBA{R: 0, G: 116, B: 217, A: 255},
+				},
 			},
 			chart.ContinuousSeries{
 				Name:    "b",

vector_renderer.go

@@ -5,12 +5,12 @@ import (
 	"fmt"
 	"image/color"
 	"io"
-	"math"
 	"strings"
 
 	"golang.org/x/image/font"
 
 	"github.com/golang/freetype/truetype"
+	"github.com/wcharczuk/go-chart/drawing"
 )
 
 // SVG returns a new png/raster renderer.
@@ -93,13 +93,13 @@ func (vr *vectorRenderer) FillStroke() {
 }
 
 func (vr *vectorRenderer) drawPath() {
-	vr.c.Path(strings.Join(vr.p, "\n"), vr.s.SVG())
+	vr.c.Path(strings.Join(vr.p, "\n"), vr.s.SVG(vr.dpi))
 	vr.p = []string{}
 }
 
 // Circle implements the interface method.
 func (vr *vectorRenderer) Circle(radius float64, x, y int) {
-	vr.c.Circle(x, y, int(radius), vr.s.SVG())
+	vr.c.Circle(x, y, int(radius), vr.s.SVG(vr.dpi))
 }
 
 // SetFont implements the interface method.
@@ -133,7 +133,7 @@ func (vr *vectorRenderer) Text(body string, x, y int) {
 	vr.s.FillColor = color.RGBA{}
 	vr.s.StrokeColor = color.RGBA{}
 	vr.s.StrokeWidth = 0
-	vr.c.Text(x, y, body, vr.s.SVG()+";"+vr.svgFontFace())
+	vr.c.Text(x, y, body, vr.s.SVG(vr.dpi)+";"+vr.svgFontFace())
 }
 
 // MeasureText uses the truetype font drawer to measure the width of text.
@@ -145,8 +145,10 @@ func (vr *vectorRenderer) MeasureText(body string) (width, height int) {
 				Size: vr.s.FontSize,
 			}),
 		}
-		width = vr.fc.MeasureString(body).Ceil()
+		w := vr.fc.MeasureString(body).Ceil()
-		height = int(math.Ceil(vr.s.FontSize))
+
+		width = int(drawing.PointsToPixels(vr.dpi, float64(w)))
+		height = int(drawing.PointsToPixels(vr.dpi, vr.s.FontSize))
 	}
 	return
 }