Adding upstream version 2.1.2.

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

examples/descending/main.go

@@ -0,0 +1,49 @@
+package main
+
+//go:generate go run main.go
+
+import (
+	"os"
+
+	"github.com/wcharczuk/go-chart/v2"
+)
+
+func main() {
+
+	/*
+	   The below will draw the same chart as the `basic` example, except with both the x and y axes turned on.
+	   In this case, both the x and y axis ticks are generated automatically, the x and y ranges are established automatically,
+	   the canvas "box" is adjusted to fit the space the axes occupy so as not to clip.
+	   Additionally, it shows how you can use the "Descending" property of continuous ranges to change the ordering of
+	   how values (including ticks) are drawn.
+	*/
+
+	graph := chart.Chart{
+		Height: 500,
+		Width:  500,
+		XAxis:  chart.XAxis{
+			/*Range: &chart.ContinuousRange{
+				Descending: true,
+			},*/
+		},
+		YAxis: chart.YAxis{
+			Range: &chart.ContinuousRange{
+				Descending: true,
+			},
+		},
+		Series: []chart.Series{
+			chart.ContinuousSeries{
+				Style: chart.Style{
+					StrokeColor: chart.GetDefaultColor(0).WithAlpha(64),
+					FillColor:   chart.GetDefaultColor(0).WithAlpha(64),
+				},
+				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)
+}