changing how we handle default padding.

chart.go

@@ -323,7 +323,7 @@ func (c Chart) getAxisAdjustedCanvasBox(r Renderer, canvasBox Box, xr, yr, yra R
 		axesOuterBox = axesOuterBox.Grow(axesBounds)
 	}
 
-	return canvasBox.OuterConstrain(c.Box(), axesOuterBox)
+	return canvasBox.OuterConstrain(canvasBox, axesOuterBox)
 }
 
 func (c Chart) setRangeDomains(canvasBox Box, xr, yr, yra Range) (xr2, yr2, yra2 Range) {

examples/custom_padding/main.go

@@ -0,0 +1,46 @@
+package main
+
+import (
+	"net/http"
+
+	"github.com/wcharczuk/go-chart"
+	"github.com/wcharczuk/go-chart/drawing"
+)
+
+func drawChart(res http.ResponseWriter, req *http.Request) {
+	graph := chart.Chart{
+		Background: chart.Style{
+			Padding: chart.Box{
+				Top:    10,
+				Left:   25,
+				Right:  25,
+				Bottom: 10,
+			},
+			FillColor: drawing.ColorFromHex("efefef"),
+		},
+		XAxis: chart.XAxis{
+			Style: chart.Style{
+				Show: true,
+			},
+		},
+		YAxis: chart.YAxis{
+			Style: chart.Style{
+				Show: true,
+			},
+		},
+		Series: []chart.Series{
+			chart.ContinuousSeries{
+				XValues: chart.Seq(1.0, 100.0),
+				YValues: chart.SeqRand(100.0, 256.0),
+			},
+		},
+	}
+
+	res.Header().Set("Content-Type", "image/png")
+	graph.Render(chart.PNG, res)
+}
+
+func main() {
+	http.HandleFunc("/", drawChart)
+	http.ListenAndServe(":8080", nil)
+}