Custmize colors for line in line chart

[abhijitpawar12]

Hi @vicanso
Can we do customisation for line colors in LineChart
func GenerateLineChart(values [][]float64, xaxisArray []string, chartName string, id string) {
minValue := 0.0
maxValue := 100.0
show := true
splitLineShow := true

yAxisOption1 := charts.YAxisOption{
	Min:           &minValue,
	Max:           &maxValue,
	Font:          nil, // Replace with actual *truetype.Font if available
	Data:          []string{"A", "B", "C"},
	FontSize:      6,
	Position:      "left",
	FontColor:     charts.Color{R: 0, G: 0, B: 0, A: 255}, // Black color
	Formatter:     "{value}",
	Color:         charts.Color{R: 255, G: 0, B: 0, A: 255}, // Red color
	Show:          &show,
	DivideCount:   5,
	Unit:          1,
	SplitLineShow: &splitLineShow,
}

fmt.Print(yAxisOption1)

p, err := charts.LineRender(
	values,

	charts.XAxisDataOptionFunc(xaxisArray),

	func(opt *charts.ChartOption) {
		opt.Legend.Padding = charts.Box{
			Top:    20,
			Bottom: 30,
		}

		opt.YAxisOptions = []charts.YAxisOption{
			{
				SplitLineShow: charts.TrueFlag(),
				FontSize:      10,
				FontColor:     charts.Color{R: 0, G: 0, B: 0, A: 255}, // Black color
				Formatter:     "{value} " + "MB",
			},
		}

		opt.XAxis = charts.XAxisOption{
			Data:      xaxisArray,
			FontSize:  10,
			FontColor: charts.Color{R: 0, G: 0, B: 0, A: 255}, // Black color
		}

		opt.SymbolShow = charts.TrueFlag()
		opt.LineStrokeWidth = 4
		opt.Width = 600
		opt.Height = 300

		// Customize line colors for each series using StrokeStyle
		colors := []charts.Color{
			{R: 255, G: 0, B: 0, A: 255}, // Red
			{R: 255, G: 0, B: 0, A: 255}, // Green
			{R: 255, G: 0, B: 0, A: 255}, // Blue
			{R: 255, G: 0, B: 0, A: 255}, // Orange
		}

		for i := range opt.SeriesList {
			opt.SeriesList[i].Style = charts.Style{
				StrokeColor: colors[i%len(colors)],
				FontColor:   colors[i%len(colors)],
				FillColor:   colors[i%len(colors)],
			}

		}
	},

	charts.TitleOptionFunc(charts.TitleOption{
		Text:      "MB",                                      // Set the title with the unit
		FontColor: charts.Color{R: 69, G: 69, B: 69, A: 255}, // Black color
	}),
)

[vicanso]

https://github.com/vicanso/go-charts/blob/main/theme.go#L124

You can add your customize theme.