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fixing dash arrays and style handling in vector renderer.

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This commit is contained in:
Will Charczuk 2016-07-15 18:19:29 -07:00
parent 98cda14767
commit 9ad15b3288
2 changed files with 55 additions and 44 deletions
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30
style.go
View file

@ -160,12 +160,15 @@ func (s Style) SVG(dpi float64) string {
if !fnc.IsZero() {
fillText = "fill:" + fnc.String()
}
return strings.Join([]string{strokeWidthText, strokeText, fillText, fontSizeText}, ";")
fontText := s.SVGFontFace()
return strings.Join([]string{strokeWidthText, strokeText, fillText, fontSizeText, fontText}, ";")
}
// SVGStroke returns the stroke components.
func (s Style) SVGStroke() Style {
return Style{
StrokeDashArray: s.StrokeDashArray,
StrokeColor: s.StrokeColor,
StrokeWidth: s.StrokeWidth,
}
@ -181,6 +184,7 @@ func (s Style) SVGFill() Style {
// SVGFillAndStroke returns the fill and stroke components.
func (s Style) SVGFillAndStroke() Style {
return Style{
StrokeDashArray: s.StrokeDashArray,
FillColor: s.FillColor,
StrokeColor: s.StrokeColor,
StrokeWidth: s.StrokeWidth,
@ -194,3 +198,27 @@ func (s Style) SVGText() Style {
FontSize: s.FontSize,
}
}
// SVGFontFace returns the font face for the style.
func (s Style) SVGFontFace() string {
family := "sans-serif"
if s.GetFont() != nil {
name := s.GetFont().Name(truetype.NameIDFontFamily)
if len(name) != 0 {
family = fmt.Sprintf(`'%s',%s`, name, family)
}
}
return fmt.Sprintf("font-family:%s", family)
}
// SVGStrokeDashArray returns the stroke-dasharray property of a style.
func (s Style) SVGStrokeDashArray() string {
if len(s.StrokeDashArray) > 0 {
var values []string
for _, v := range s.StrokeDashArray {
values = append(values, fmt.Sprintf("%0.1f", v))
}
return "stroke-dasharray=\"" + strings.Join(values, ", ") + "\""
}
return ""
}

59
vector_renderer.go
View file

@ -31,7 +31,6 @@ type vectorRenderer struct {
b *bytes.Buffer
c *canvas
s *Style
f *truetype.Font
p []string
fc *font.Drawer
}
@ -44,6 +43,7 @@ func (vr *vectorRenderer) GetDPI() float64 {
// SetDPI implements the interface method.
func (vr *vectorRenderer) SetDPI(dpi float64) {
vr.dpi = dpi
vr.c.dpi = dpi
}
// SetStrokeColor implements the interface method.
@ -93,23 +93,25 @@ func (vr *vectorRenderer) Fill() {
// FillStroke draws the path with both fill and stroke.
func (vr *vectorRenderer) FillStroke() {
vr.drawPath(vr.s.SVGFillAndStroke())
s := vr.s.SVGFillAndStroke()
vr.drawPath(s)
}
// drawPath draws a path.
func (vr *vectorRenderer) drawPath(s Style) {
vr.c.Path(strings.Join(vr.p, "\n"), s.SVG(vr.dpi))
vr.c.Path(strings.Join(vr.p, "\n"), &s)
vr.p = []string{} // clear the path
}
// Circle implements the interface method.
func (vr *vectorRenderer) Circle(radius float64, x, y int) {
vr.c.Circle(x, y, int(radius), vr.s.SVG(vr.dpi))
style := vr.s.SVGFillAndStroke()
vr.c.Circle(x, y, int(radius), &style)
}
// SetFont implements the interface method.
func (vr *vectorRenderer) SetFont(f *truetype.Font) {
vr.f = f
vr.s.Font = f
}
// SetFontColor implements the interface method.
@ -122,29 +124,17 @@ func (vr *vectorRenderer) SetFontSize(size float64) {
vr.s.FontSize = size
}
// svgFontFace returns the font face component of an svg element style.
func (vr *vectorRenderer) svgFontFace() string {
family := "sans-serif"
if vr.f != nil {
name := vr.f.Name(truetype.NameIDFontFamily)
if len(name) != 0 {
family = fmt.Sprintf(`'%s',%s`, name, family)
}
}
return fmt.Sprintf("font-family:%s", family)
}
// Text draws a text blob.
func (vr *vectorRenderer) Text(body string, x, y int) {
s := vr.s.SVGText()
vr.c.Text(x, y, body, s.SVG(vr.dpi)+";"+vr.svgFontFace())
style := vr.s.SVGText()
vr.c.Text(x, y, body, &style)
}
// MeasureText uses the truetype font drawer to measure the width of text.
func (vr *vectorRenderer) MeasureText(body string) (box Box) {
if vr.f != nil {
if vr.s.GetFont() != nil {
vr.fc = &font.Drawer{
Face: truetype.NewFace(vr.f, &truetype.Options{
Face: truetype.NewFace(vr.s.GetFont(), &truetype.Options{
DPI: vr.dpi,
Size: vr.s.FontSize,
}),
@ -172,6 +162,7 @@ func newCanvas(w io.Writer) *canvas {
type canvas struct {
w io.Writer
dpi float64
width int
height int
}
@ -182,28 +173,20 @@ func (c *canvas) Start(width, height int) {
c.w.Write([]byte(fmt.Sprintf(`<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="%d" height="%d">\n`, c.width, c.height)))
}
func (c *canvas) Path(d string, style ...string) {
if len(style) > 0 {
c.w.Write([]byte(fmt.Sprintf(`<path d="%s" style="%s"/>\n`, d, style[0])))
} else {
c.w.Write([]byte(fmt.Sprintf(`<path d="%s"/>\n`, d)))
func (c *canvas) Path(d string, style *Style) {
var strokeDashArrayProperty string
if len(style.StrokeDashArray) > 0 {
strokeDashArrayProperty = style.SVGStrokeDashArray()
}
c.w.Write([]byte(fmt.Sprintf(`<path %s d="%s" style="%s"/>\n`, strokeDashArrayProperty, d, style.SVG(c.dpi))))
}
func (c *canvas) Text(x, y int, body string, style ...string) {
if len(style) > 0 {
c.w.Write([]byte(fmt.Sprintf(`<text x="%d" y="%d" style="%s">%s</text>`, x, y, style[0], body)))
} else {
c.w.Write([]byte(fmt.Sprintf(`<text x="%d" y="%d">%s</text>`, x, y, body)))
}
func (c *canvas) Text(x, y int, body string, style *Style) {
c.w.Write([]byte(fmt.Sprintf(`<text x="%d" y="%d" style="%s">%s</text>`, x, y, style.SVG(c.dpi), body)))
}
func (c *canvas) Circle(x, y, r int, style ...string) {
if len(style) > 0 {
c.w.Write([]byte(fmt.Sprintf(`<circle cx="%d" cy="%d" r="%d" style="%s">`, x, y, r, style[0])))
} else {
c.w.Write([]byte(fmt.Sprintf(`<circle cx="%d" cy="%d" r="%d">`, x, y, r)))
}
func (c *canvas) Circle(x, y, r int, style *Style) {
c.w.Write([]byte(fmt.Sprintf(`<circle cx="%d" cy="%d" r="%d" style="%s">`, x, y, r, style.SVG(c.dpi))))
}
func (c *canvas) End() {