// ColorIndex converts RGB value to corresponding color number.
func ColorIndex(cl []int) color.ColorNumber {
minind := 0
minval := 1000000
for i, c := range color.ColorRGB {
tmpval := 0
for j := 0; j < 3; j++ {
tmpval += (cl[j] - int(c[j])) * (cl[j] - int(c[j]))
}
if tmpval < minval {
minind = i
minval = tmpval
if minval == 0 {
break
}
}
}
return color.ColorNumber(minind)
}
// ParseLayer parses LAYER tables.
func ParseLayer(d *drawing.Drawing, data [][2]string) (table.SymbolTable, error) {
var name string
var flag int
var col color.ColorNumber
var lt *table.LineType
var lw int
for _, dt := range data {
switch dt[0] {
case "2":
name = dt[1]
case "70":
val, err := strconv.ParseInt(strings.TrimSpace(dt[1]), 10, 64)
if err != nil {
return nil, err
}
flag = int(val)
case "62":
val, err := strconv.ParseInt(strings.TrimSpace(dt[1]), 10, 64)
if err != nil {
return nil, err
}
col = color.ColorNumber(val)
case "6":
l, err := d.LineType(dt[1])
if err != nil {
return nil, err
}
lt = l
case "370":
val, err := strconv.ParseInt(strings.TrimSpace(dt[1]), 10, 64)
if err != nil {
return nil, err
}
lw = int(val)
case "390":
// plotstyle
}
}
l := table.NewLayer(name, col, lt)
l.SetFlag(flag)
l.SetLineWidth(lw)
l.SetPlotStyle(d.PlotStyle)
return l, nil
}