func (ts *TextSymbolizer) Draw(gc draw2d.GraphicContext, shape geom.Shape) {
if !ts.Applies(shape) {
return
}
if name := shape.Attribute(ts.s.Attr); name != "" {
gc.SetFontSize(ts.s.Size)
l, t, r, b := gc.GetStringBounds(name)
bb := shape.Bbox()
dx := math.Abs(bb[2] - bb[0])
dy := math.Abs(bb[3] - bb[1])
ox, oy := dx/2, dy/2
x, y := ts.r.matrix.TransformPoint(bb[0]+ox, bb[1]-oy)
gc.SetFillColor(ts.s.Fill)
gc.FillStringAt(name, x-(r-l)/2, y-(t-b)/2)
}
}
func doesExpr(part string, shape geom.Shape) bool {
var name string
var value string
if strings.Contains(part, " = ") {
parts := strings.Split(part, " = ")
fmt.Sscanf(parts[0], "%s", &name)
value = strings.TrimSpace(parts[1])
return shape.Attribute(name) == value
} else if strings.Contains(part, " contains ") {
parts := strings.Split(part, " contains ")
fmt.Sscanf(parts[0], "%s", &name)
value = strings.TrimSpace(parts[1])
attr := shape.Attribute(name)
return strings.Contains(attr, value)
} else {
fmt.Sscanf(part, "%s", &name)
return shape.Attribute(name) != ""
}
return false
}