Process SMIL directives in XML data: Difference between revisions
Process SMIL directives in XML data (view source)
Revision as of 16:23, 20 January 2019
, 5 years agoAdded Go
m (Dkf moved page Process Smiled XML Data to Process SMIL directives in XML data: capitalisation policy; clarify a little) |
(Added Go) |
||
Line 60:
</Scene>
</X3D></lang>
=={{header|Go}}==
{{libheader|etree}}
<lang go>package main
import (
"fmt"
"github.com/beevik/etree"
"log"
"os"
"strconv"
"strings"
)
type animData struct {
element *etree.Element
attrib string
from string
to string
begin float64
dur float64
}
func check(err error) {
if err != nil {
log.Fatal(err)
}
}
func (ad *animData) AtTime(t float64) string {
beg := ad.begin
end := beg + ad.dur
if t < beg || t > end {
log.Fatalf("time must be in interval [%g, %g]", beg, end)
}
fromSplit := strings.Fields(ad.from)
toSplit := strings.Fields(ad.to)
le := len(fromSplit)
interSplit := make([]string, le)
for i := 0; i < le; i++ {
fromF, err := strconv.ParseFloat(fromSplit[i], 64)
check(err)
toF, err := strconv.ParseFloat(toSplit[i], 64)
check(err)
interF := (fromF*(end-t) + toF*(t-beg)) / ad.dur
interSplit[i] = fmt.Sprintf("%.2f", interF)
}
return strings.Join(interSplit, " ")
}
func main() {
doc := etree.NewDocument()
check(doc.ReadFromFile("smil.xml"))
smil := doc.SelectElement("smil")
if smil == nil {
log.Fatal("'smil' element not found")
}
x3d := smil.SelectElement("X3D")
if x3d == nil {
log.Fatal("'X3D' element not found")
}
doc.SetRoot(x3d) // remove 'smil' element
var ads []*animData
for _, a := range doc.FindElements("//animate") {
attrib := a.SelectAttrValue("attributeName", "?")
from := a.SelectAttrValue("from", "?")
to := a.SelectAttrValue("to", "?")
beginS := a.SelectAttrValue("begin", "?")
durS := a.SelectAttrValue("dur", "?")
if attrib == "?" || from == "?" || to == "?" ||
beginS == "?" || durS == "?" {
log.Fatal("an animate element has missing attribute(s)")
}
begin, err := strconv.ParseFloat(beginS[:len(beginS)-1], 64)
check(err)
dur, err := strconv.ParseFloat(durS[:len(durS)-1], 64)
check(err)
p := a.Parent()
if p == nil {
log.Fatal("an animate element has no parent")
}
pattrib := p.SelectAttrValue(attrib, "?")
if pattrib == "?" {
log.Fatal("an animate element's parent has missing attribute")
}
ads = append(ads, &animData{p, attrib, from, to, begin, dur})
p.RemoveChild(a) // remove 'animate' element
}
ts := []float64{0, 2}
for _, t := range ts {
for _, ad := range ads {
s := ad.AtTime(t)
ad.element.CreateAttr(ad.attrib, s)
}
doc.Indent(2)
fmt.Printf("At time = %g seconds:\n\n", t)
doc.WriteTo(os.Stdout)
fmt.Println()
}
}</lang>
{{out}}
<pre>
At time = 0 seconds:
<?xml version="1.0" ?>
<X3D>
<Scene>
<Viewpoint position="0 0 8" orientation="0 0 1 0"/>
<PointLight color="1 1 1" location="0 2 0"/>
<Shape>
<Box size="2.00 1.00 2.00"/>
<Appearance>
<Material diffuseColor="0.00 0.60 1.00"/>
</Appearance>
</Shape>
</Scene>
</X3D>
At time = 2 seconds:
<?xml version="1.0" ?>
<X3D>
<Scene>
<Viewpoint position="0 0 8" orientation="0 0 1 0"/>
<PointLight color="1 1 1" location="0 2 0"/>
<Shape>
<Box size="1.80 1.20 1.80"/>
<Appearance>
<Material diffuseColor="0.20 0.56 0.80"/>
</Appearance>
</Shape>
</Scene>
</X3D>
</pre>
=={{header|Tcl}}==
| |||