Adding upstream version 2.1.2.

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

examples/bar_chart_base_value/main.go

@@ -0,0 +1,62 @@
+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() {
+	profitStyle := chart.Style{
+		FillColor:   drawing.ColorFromHex("13c158"),
+		StrokeColor: drawing.ColorFromHex("13c158"),
+		StrokeWidth: 0,
+	}
+
+	lossStyle := chart.Style{
+		FillColor:   drawing.ColorFromHex("c11313"),
+		StrokeColor: drawing.ColorFromHex("c11313"),
+		StrokeWidth: 0,
+	}
+
+	sbc := chart.BarChart{
+		Title: "Bar Chart Using BaseValue",
+		Background: chart.Style{
+			Padding: chart.Box{
+				Top: 40,
+			},
+		},
+		Height:   512,
+		BarWidth: 60,
+		YAxis: chart.YAxis{
+			Ticks: []chart.Tick{
+				{Value: -4.0, Label: "-4"},
+				{Value: -2.0, Label: "-2"},
+				{Value: 0, Label: "0"},
+				{Value: 2.0, Label: "2"},
+				{Value: 4.0, Label: "4"},
+				{Value: 6.0, Label: "6"},
+				{Value: 8.0, Label: "8"},
+				{Value: 10.0, Label: "10"},
+				{Value: 12.0, Label: "12"},
+			},
+		},
+		UseBaseValue: true,
+		BaseValue:    0.0,
+		Bars: []chart.Value{
+			{Value: 10.0, Style: profitStyle, Label: "Profit"},
+			{Value: 12.0, Style: profitStyle, Label: "More Profit"},
+			{Value: 8.0, Style: profitStyle, Label: "Still Profit"},
+			{Value: -4.0, Style: lossStyle, Label: "Loss!"},
+			{Value: 3.0, Style: profitStyle, Label: "Phew Ok"},
+			{Value: -2.0, Style: lossStyle, Label: "Oh No!"},
+		},
+	}
+
+	f, _ := os.Create("output.png")
+	defer f.Close()
+	sbc.Render(chart.PNG, f)
+}