feat: support stroke width of line chart

chart_option.go

@@ -64,6 +64,8 @@ type ChartOption struct {
 	BackgroundColor Color
 	// The flag for show symbol of line, set this to *false will hide symbol
 	SymbolShow *bool
+	// The stroke width of line chart
+	LineStrokeWidth float64
 	// The child charts
 	Children []ChartOption
 }

charts.go

@@ -381,6 +381,7 @@ func Render(opt ChartOption, opts ...OptionFunc) (*Painter, error) {
 				Font:        opt.font,
 				XAxis:       opt.XAxis,
 				SymbolShow:  opt.SymbolShow,
+				StrokeWidth: opt.LineStrokeWidth,
 			}).render(renderResult, lineSeriesList)
 			return err
 		})

examples/line_chart/main.go

@@ -96,6 +96,7 @@ func main() {
 				Bottom: 10,
 			}
 			opt.SymbolShow = charts.FalseFlag()
+			opt.LineStrokeWidth = 1
 		},
 	)
 

line_chart.go

@@ -62,6 +62,8 @@ type LineChartOption struct {
 	Legend LegendOption
 	// The flag for show symbol of line, set this to *false will hide symbol
 	SymbolShow *bool
+	// The stroke width of line
+	StrokeWidth float64
 	// background is filled
 	backgroundIsFilled bool
 }
@@ -95,12 +97,16 @@ func (l *lineChart) render(result *defaultRenderResult, seriesList SeriesList) (
 		markPointPainter,
 		markLinePainter,
 	}
+	strokeWidth := opt.StrokeWidth
+	if strokeWidth == 0 {
+		strokeWidth = defaultStrokeWidth
+	}
 	for index := range seriesList {
 		series := seriesList[index]
 		seriesColor := opt.Theme.GetSeriesColor(series.index)
 		drawingStyle := Style{
 			StrokeColor: seriesColor,
-			StrokeWidth: defaultStrokeWidth,
+			StrokeWidth: strokeWidth,
 		}
 
 		seriesPainter.SetDrawingStyle(drawingStyle)