Adding upstream version 2.1.2.

Signed-off-by: Daniel Baumann <daniel@debian.org>

examples/custom_styles/main.go

@@ -0,0 +1,38 @@
+package main
+
+//go:generate go run main.go
+
+import (
+	"os"
+
+	"github.com/wcharczuk/go-chart/v2"
+	"github.com/wcharczuk/go-chart/v2/drawing"
+)
+
+func main() {
+	/*
+	   In this example we set some custom colors for the series and the chart background and canvas.
+	*/
+	graph := chart.Chart{
+		Background: chart.Style{
+			FillColor: drawing.ColorBlue,
+		},
+		Canvas: chart.Style{
+			FillColor: drawing.ColorFromHex("efefef"),
+		},
+		Series: []chart.Series{
+			chart.ContinuousSeries{
+				Style: chart.Style{
+					StrokeColor: drawing.ColorRed,               // will supercede defaults
+					FillColor:   drawing.ColorRed.WithAlpha(64), // will supercede defaults
+				},
+				XValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0},
+				YValues: []float64{1.0, 2.0, 3.0, 4.0, 5.0},
+			},
+		},
+	}
+
+	f, _ := os.Create("output.png")
+	defer f.Close()
+	graph.Render(chart.PNG, f)
+}