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