// addOffsetPosition add text-dx/dy offsets
// set POSITION so that the offsets are from the outer bounds of the
// label. e.g. dx=10 moves the left bound of the label 10 pixels to the right
func addOffsetPosition(style *Block, properties *mss.Properties) {
dx, _ := properties.GetFloat("text-dx")
dy, _ := properties.GetFloat("text-dy")
dy = -dy
var position string
if dy < 0 {
dy = -dy
position += "l"
} else if dy > 0 {
position += "u"
} else {
position += "c"
}
if dx < 0 {
dx = -dx
position += "l"
} else if dx > 0 {
position += "r"
} else {
position += "c"
}
if dx != 0 || dy != 0 {
style.Add("OFFSET", fmt.Sprintf("%.0f %.0f", dx, dy))
}
style.Add("Position", position)
}
func fmtFloatProp(p *mss.Properties, name string, scale float64) *string {
v, ok := p.GetFloat(name)
if !ok {
return nil
}
r := strconv.FormatFloat(v*scale, 'f', -1, 64)
return &r
}