Optimize svg output sligtly
This commit is contained in:
Drahoslav
parent
99cc16d0ac
commit
1588b49f0d
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@ -12,6 +12,7 @@ import (
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"image/color"
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"image/png"
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"math"
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"strconv"
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"strings"
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)
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@ -19,19 +20,19 @@ func toSvgRGBA(c color.Color) string {
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r, g, b, a := c.RGBA()
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r, g, b, a = r>>8, g>>8, b>>8, a>>8
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if a == 255 {
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return fmt.Sprintf("#%02X%02X%02X", r, g, b)
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return optiSprintf("#%02X%02X%02X", r, g, b)
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}
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return fmt.Sprintf("rgba(%v,%v,%v,%.3f)", r, g, b, float64(a)/255)
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return optiSprintf("rgba(%v,%v,%v,%f)", r, g, b, float64(a)/255)
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}
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func toSvgLength(l float64) string {
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return fmt.Sprintf("%.4f", l)
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return optiSprintf("%f", l)
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}
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func toSvgArray(nums []float64) string {
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arr := make([]string, len(nums))
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for i, num := range nums {
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arr[i] = fmt.Sprintf("%.4f", num)
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arr[i] = optiSprintf("%f", num)
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}
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return strings.Join(arr, ",")
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}
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@ -49,16 +50,16 @@ func toSvgPathDesc(p *draw2d.Path) string {
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for i, cmp := range p.Components {
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switch cmp {
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case draw2d.MoveToCmp:
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parts[i] = fmt.Sprintf("M %.4f,%.4f", ps[0], ps[1])
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parts[i] = optiSprintf("M %f,%f", ps[0], ps[1])
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ps = ps[2:]
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case draw2d.LineToCmp:
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parts[i] = fmt.Sprintf("L %.4f,%.4f", ps[0], ps[1])
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parts[i] = optiSprintf("L %f,%f", ps[0], ps[1])
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ps = ps[2:]
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case draw2d.QuadCurveToCmp:
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parts[i] = fmt.Sprintf("Q %.4f,%.4f %.4f,%.4f", ps[0], ps[1], ps[2], ps[3])
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parts[i] = optiSprintf("Q %f,%f %f,%f", ps[0], ps[1], ps[2], ps[3])
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ps = ps[4:]
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case draw2d.CubicCurveToCmp:
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parts[i] = fmt.Sprintf("C %.4f,%.4f %.4f,%.4f %.4f,%.4f", ps[0], ps[1], ps[2], ps[3], ps[4], ps[5])
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parts[i] = optiSprintf("C %f,%f %f,%f %f,%f", ps[0], ps[1], ps[2], ps[3], ps[4], ps[5])
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ps = ps[6:]
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case draw2d.ArcToCmp:
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cx, cy := ps[0], ps[1] // center
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@ -83,15 +84,15 @@ func toSvgPathDesc(p *draw2d.Path) string {
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// dirty hack to ensure whole arc is drawn
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// if start point equals end point
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if sweep == 1 {
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x += 0.001 * sinfi
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y += 0.001 * -cosfi
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x += 0.0001 * sinfi
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y += 0.0001 * -cosfi
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} else {
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x += 0.001 * sinfi
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y += 0.001 * cosfi
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x += 0.0001 * sinfi
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y += 0.0001 * cosfi
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}
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// rx ry x-axis-rotation large-arc-flag sweep-flag x y
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parts[i] = fmt.Sprintf("A %.4f %.4f %v %v %v %.4f %.4f",
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parts[i] = optiSprintf("A %f %f %v %v %v %F %F",
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rx, ry, 0, large, sweep, x, y,
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)
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ps = ps[6:]
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@ -108,9 +109,9 @@ func toSvgTransform(mat draw2d.Matrix) string {
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}
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if mat.IsTranslation() {
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x, y := mat.GetTranslation()
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return fmt.Sprintf("translate(%f,%f)", x, y)
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return optiSprintf("translate(%f,%f)", x, y)
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}
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return fmt.Sprintf("matrix(%f,%f,%f,%f,%f,%f)",
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return optiSprintf("matrix(%f,%f,%f,%f,%f,%f)",
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mat[0], mat[1], mat[2], mat[3], mat[4], mat[5],
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)
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}
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@ -122,3 +123,49 @@ func imageToSvgHref(image image.Image) string {
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out += base64.RawStdEncoding.EncodeToString(pngBuf.Bytes())
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return out
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}
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// Do the same thing as fmt.Sprintf
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// except it uses the optimal precition for floats: (0-3) for f and (0-6) for F
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// eg.:
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// optiSprintf("%f", 3.0) => fmt.Sprintf("%.0f", 3.0)
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// optiSprintf("%f", 3.33) => fmt.Sprintf("%.2f", 3.33)
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// optiSprintf("%f", 3.3001) => fmt.Sprintf("%.1f", 3.3001)
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// optiSprintf("%f", 3.333333333333333) => fmt.Sprintf("%.3f", 3.333333333333333)
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// optiSprintf("%F", 3.333333333333333) => fmt.Sprintf("%.6f", 3.333333333333333)
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func optiSprintf(format string, a ...interface{}) string {
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chunks := strings.Split(format, "%")
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newChunks := make([]string, len(chunks))
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for i, chunk := range chunks {
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if i != 0 {
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verb := chunk[0]
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if verb == 'f' || verb == 'F' {
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num := a[i-1].(float64)
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p := strconv.Itoa(getPrec(num, verb == 'F'))
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chunk = strings.Replace(chunk, string(verb), "."+p+"f", 1)
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}
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}
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newChunks[i] = chunk
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}
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format = strings.Join(newChunks, "%")
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return fmt.Sprintf(format, a...)
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}
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func getPrec(num float64, better bool) int {
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max := 3
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eps := 0.0005
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if better {
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max = 6
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eps = 0.0000005
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}
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prec := 0
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for math.Mod(num, 1) > eps {
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num *= 10
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eps *= 10
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prec++
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}
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if max < prec {
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return max
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}
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return prec
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}
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@ -369,7 +369,7 @@ func (gc *GraphicContext) DrawImage(image image.Image) {
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///////////////////////////////////////
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// TODO implement following methods (or remove if not neccesary)
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// GetFontName gets the current FontData as a string
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// GetFontName gets the current FontData with fontSize as a string
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func (gc *GraphicContext) GetFontName() string {
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fontData := gc.Current.FontData
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return fmt.Sprintf("%s:%d:%d:%d", fontData.Name, fontData.Family, fontData.Style, gc.Current.FontSize)
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