package chart import ( "fmt" "strings" "github.com/wcharczuk/go-chart/drawing" ) // Style is a simple style set. type Style struct { Show bool StrokeColor drawing.Color FillColor drawing.Color StrokeWidth float64 FontSize float64 FontColor drawing.Color Padding Box } // IsZero returns if the object is set or not. func (s Style) IsZero() bool { return s.StrokeColor.IsZero() && s.FillColor.IsZero() && s.StrokeWidth == 0 && s.FontSize == 0 } // GetStrokeColor returns the stroke color. func (s Style) GetStrokeColor(defaults ...drawing.Color) drawing.Color { if s.StrokeColor.IsZero() { if len(defaults) > 0 { return defaults[0] } return drawing.ColorTransparent } return s.StrokeColor } // GetFillColor returns the fill color. func (s Style) GetFillColor(defaults ...drawing.Color) drawing.Color { if s.FillColor.IsZero() { if len(defaults) > 0 { return defaults[0] } return drawing.ColorTransparent } return s.FillColor } // GetStrokeWidth returns the stroke width. func (s Style) GetStrokeWidth(defaults ...float64) float64 { if s.StrokeWidth == 0 { if len(defaults) > 0 { return defaults[0] } return DefaultStrokeWidth } return s.StrokeWidth } // GetFontSize gets the font size. func (s Style) GetFontSize(defaults ...float64) float64 { if s.FontSize == 0 { if len(defaults) > 0 { return defaults[0] } return DefaultFontSize } return s.FontSize } // GetFontColor gets the font size. func (s Style) GetFontColor(defaults ...drawing.Color) drawing.Color { if s.FontColor.IsZero() { if len(defaults) > 0 { return defaults[0] } return drawing.ColorTransparent } return s.FontColor } // SVG returns the style as a svg style string. func (s Style) SVG(dpi float64) string { sw := s.StrokeWidth sc := s.StrokeColor fc := s.FillColor fs := s.FontSize fnc := s.FontColor strokeWidthText := "stroke-width:0" if sw != 0 { strokeWidthText = "stroke-width:" + fmt.Sprintf("%d", int(sw)) } strokeText := "stroke:none" if !sc.IsZero() { strokeText = "stroke:" + sc.String() } fillText := "fill:none" if !fc.IsZero() { fillText = "fill:" + fc.String() } fontSizeText := "" if fs != 0 { fontSizeText = "font-size:" + fmt.Sprintf("%.1fpx", drawing.PointsToPixels(dpi, fs)) } if !fnc.IsZero() { fillText = "fill:" + fnc.String() } return strings.Join([]string{strokeWidthText, strokeText, fillText, fontSizeText}, ";") }