From 8edf6a5e8aca02e9fb4436f89fe8b1cf7cbcff4b Mon Sep 17 00:00:00 2001
From: Will Charczuk <will.charczuk@gmail.com>
Date: Mon, 18 Jul 2016 11:43:41 -0700
Subject: [PATCH] adding style.String()

---
 drawing_helpers.go | 26 +++++++++---------
 style.go           | 68 ++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 81 insertions(+), 13 deletions(-)

diff --git a/drawing_helpers.go b/drawing_helpers.go
index 05e94ef..f12294b 100644
--- a/drawing_helpers.go
+++ b/drawing_helpers.go
@@ -172,20 +172,24 @@ func MeasureAnnotation(r Renderer, canvasBox Box, s Style, lx, ly int, label str
 }
 
 // DrawAnnotation draws an anotation with a renderer.
-func DrawAnnotation(r Renderer, canvasBox Box, s Style, lx, ly int, label string) {
-	r.SetFillColor(s.GetFillColor(DefaultAnnotationFillColor))
-	r.SetStrokeColor(s.GetStrokeColor())
-	r.SetStrokeWidth(s.GetStrokeWidth())
-	r.SetStrokeDashArray(s.GetStrokeDashArray())
+func DrawAnnotation(r Renderer, canvasBox Box, style Style, lx, ly int, label string) {
+	r.SetFillColor(style.GetFillColor(DefaultAnnotationFillColor))
+	r.SetStrokeColor(style.GetStrokeColor())
+	r.SetStrokeWidth(style.GetStrokeWidth())
+	r.SetStrokeDashArray(style.GetStrokeDashArray())
+
+	r.SetFont(style.GetFont())
+	r.SetFontColor(style.GetFontColor(DefaultTextColor))
+	r.SetFontSize(style.GetFontSize(DefaultAnnotationFontSize))
 
 	textBox := r.MeasureText(label)
 	textWidth := textBox.Width()
 	halfTextHeight := textBox.Height() >> 1
 
-	pt := s.Padding.GetTop(DefaultAnnotationPadding.Top)
-	pl := s.Padding.GetLeft(DefaultAnnotationPadding.Left)
-	pr := s.Padding.GetRight(DefaultAnnotationPadding.Right)
-	pb := s.Padding.GetBottom(DefaultAnnotationPadding.Bottom)
+	pt := style.Padding.GetTop(DefaultAnnotationPadding.Top)
+	pl := style.Padding.GetLeft(DefaultAnnotationPadding.Left)
+	pr := style.Padding.GetRight(DefaultAnnotationPadding.Right)
+	pb := style.Padding.GetBottom(DefaultAnnotationPadding.Bottom)
 
 	textX := lx + pl + DefaultAnnotationDeltaWidth
 	textY := ly + halfTextHeight
@@ -211,10 +215,6 @@ func DrawAnnotation(r Renderer, canvasBox Box, s Style, lx, ly int, label string
 	r.Close()
 	r.FillStroke()
 
-	r.SetFont(s.GetFont())
-	r.SetFontColor(s.GetFontColor(DefaultTextColor))
-	r.SetFontSize(s.GetFontSize(DefaultAnnotationFontSize))
-
 	r.Text(label, textX, textY)
 }
 
diff --git a/style.go b/style.go
index 7c5e2f2..dbfb4fb 100644
--- a/style.go
+++ b/style.go
@@ -28,6 +28,74 @@ func (s Style) IsZero() bool {
 	return s.StrokeColor.IsZero() && s.FillColor.IsZero() && s.StrokeWidth == 0 && s.FontColor.IsZero() && s.FontSize == 0 && s.Font == nil
 }
 
+func (s Style) String() string {
+	if s.IsZero() {
+		return "{}"
+	}
+
+	var output []string
+	if s.Show {
+		output = []string{"\"show\": true"}
+	} else {
+		output = []string{"\"show\": false"}
+	}
+
+	if !s.Padding.IsZero() {
+		output = append(output, fmt.Sprintf("\"padding\": %s", s.Padding.String()))
+	} else {
+		output = append(output, "\"padding\": null")
+	}
+
+	if s.StrokeWidth >= 0 {
+		output = append(output, fmt.Sprintf("\"stroke_width\": %0.2f", s.StrokeWidth))
+	} else {
+		output = append(output, "\"stroke_width\": null")
+	}
+
+	if !s.StrokeColor.IsZero() {
+		output = append(output, fmt.Sprintf("\"stroke_color\": %s", s.StrokeColor.String()))
+	} else {
+		output = append(output, "\"stroke_color\": null")
+	}
+
+	if len(s.StrokeDashArray) > 0 {
+		var elements []string
+		for _, v := range s.StrokeDashArray {
+			elements = append(elements, fmt.Sprintf("%.2f", v))
+		}
+		dashArray := strings.Join(elements, ", ")
+		output = append(output, fmt.Sprintf("\"stroke_dash_array\": [%s]", dashArray))
+	} else {
+		output = append(output, "\"stroke_dash_array\": null")
+	}
+
+	if !s.FillColor.IsZero() {
+		output = append(output, fmt.Sprintf("\"fill_color\": %s", s.FillColor.String()))
+	} else {
+		output = append(output, "\"fill_color\": null")
+	}
+
+	if s.FontSize != 0 {
+		output = append(output, fmt.Sprintf("\"font_size\": \"%0.2fpt\"", s.FontSize))
+	} else {
+		output = append(output, "\"fill_color\": null")
+	}
+
+	if !s.FillColor.IsZero() {
+		output = append(output, fmt.Sprintf("\"font_color\": %s", s.FillColor.String()))
+	} else {
+		output = append(output, "\"font_color\": null")
+	}
+
+	if s.Font != nil {
+		output = append(output, fmt.Sprintf("\"font\": \"%s\"", s.Font.Name(truetype.NameIDFontFamily)))
+	} else {
+		output = append(output, "\"font_color\": null")
+	}
+
+	return "{" + strings.Join(output, ", ") + "}"
+}
+
 // GetStrokeColor returns the stroke color.
 func (s Style) GetStrokeColor(defaults ...drawing.Color) drawing.Color {
 	if s.StrokeColor.IsZero() {