Add subpath to existing path

[dmitryp35155038]

I need to add a subpath to an existing path. The SubPathItems object doesn't provide the add method, so to add the subpath I create a new path that includes old subpaths and the new one, and then delete the old path. This causes flickering and doesn't look like the best solution.

Is there a better way to add a subpath to an existing path?

[r-bin · Accepted solution]

Try this method.

var subpath = example_subpath();
add_subpath(subpath);
////////////////////////////////////////////////////////////
function add_subpath(subpath_info)
    {
    try
        {
        var d = new ActionDescriptor();
        var r = new ActionReference();
        r.putEnumerated(charIDToTypeID("Path"), charIDToTypeID("Ordn"), charIDToTypeID("Trgt") );
        var path = executeActionGet(r).getObjectValue(stringIDToTypeID("pathContents"));           
        var list = path.getList(stringIDToTypeID("pathComponents"));           
        for (var i = 0; i < subpath_info.length; i++)
            list.putObject(stringIDToTypeID("null"), subpath_to_desc(subpath_info));
        d.putReference( stringIDToTypeID( "null" ), r );
        d.putList(charIDToTypeID("T   "), list);
        executeAction(charIDToTypeID("setd"), d, DialogModes.NO);
        return true;
        function subpath_to_desc(pth)
            {
            try
                {
                var op = stringIDToTypeID("xor");
                try {        
                    switch (pth.operation)
                        {
                        case ShapeOperation.SHAPEADD      : op = stringIDToTypeID("add");       break;
                        case ShapeOperation.SHAPEINTERSECT: op = stringIDToTypeID("subtract");  break;
                        case ShapeOperation.SHAPESUBTRACT : op = stringIDToTypeID("intersect"); break;
                        case ShapeOperation.SHAPEXOR      : op = stringIDToTypeID("xor");       break;
                        }
                    }
                catch(e) {}
                var d = new ActionDescriptor();
                var subpathlist = new ActionList();              
                var d1 = new ActionDescriptor();
                try { d1.putBoolean(stringIDToTypeID("closedSubpath"), pth.closed); } catch(e) {}
                var points = new ActionList();              
                var pp = pth.entireSubPath;
                for (var i = 0; i < pp.length; i++)
                    {
                    var d2 = new ActionDescriptor();
                    var anchor = new ActionDescriptor();
                    anchor.putUnitDouble( stringIDToTypeID("horizontal"), charIDToTypeID( "#Rlt" ), pp.anchor[0]);
                    anchor.putUnitDouble( stringIDToTypeID("vertical"),   charIDToTypeID( "#Rlt" ), pp.anchor[1]);
                    d2.putObject(stringIDToTypeID("anchor"),   stringIDToTypeID("paint"), anchor);
                    try {        
                        var forward = new ActionDescriptor();
                        forward.putUnitDouble( stringIDToTypeID("horizontal"), charIDToTypeID( "#Rlt" ), pp.leftDirection[0]);
                        forward.putUnitDouble( stringIDToTypeID("vertical"),   charIDToTypeID( "#Rlt" ), pp.leftDirection[1]);
                        d2.putObject(stringIDToTypeID("forward"),  stringIDToTypeID("paint"), forward);
                        }
                    catch(e) {}
                    try {        
                        var backward = new ActionDescriptor();
                        backward.putUnitDouble( stringIDToTypeID("horizontal"), charIDToTypeID( "#Rlt" ), pp.rightDirection[0]);
                        backward.putUnitDouble( stringIDToTypeID("vertical"),   charIDToTypeID( "#Rlt" ), pp.rightDirection[1]);
                        d2.putObject(stringIDToTypeID("backward"), stringIDToTypeID("paint"), backward);
                        }
                    catch(e) {}
                    try {        
                        d2.putBoolean(stringIDToTypeID("smooth"), pp.kind==PointKind.SMOOTHPOINT?true:false);
                        }
                    catch(e) {}
                    points.putObject(stringIDToTypeID("null"), d2)
                    }
                d1.putList(stringIDToTypeID("points"), points)
                subpathlist.putObject(stringIDToTypeID("null"), d1)
                d.putEnumerated(stringIDToTypeID("shapeOperation"), stringIDToTypeID("shapeOperation"), op );
                d.putList(stringIDToTypeID("subpathListKey"), subpathlist);
                return d;
                }
            catch (e) { alert(e); return null; }
            }
        }
    catch (e) { alert(e); return false; }
    }
////////////////////////////////////////////////////////////
function example_subpath()
    {
    var pth = new Array();
    var p = new Array();
    p[0] = new PathPointInfo;   
    p[0].kind = PointKind.CORNERPOINT;  
    p[0].anchor = [100, 10];
    p[0].leftDirection  = p[0].anchor;
    p[0].rightDirection = p[0].anchor;
    p[1] = new PathPointInfo;   
    p[1].kind = PointKind.CORNERPOINT;  
    p[1].anchor = [150, 60]
    p[1].leftDirection  = p[1].anchor;
    p[1].rightDirection = p[1].anchor;
    p[2] = new PathPointInfo;   
    p[2].anchor = [50, 60];
    pth[0] = new SubPathInfo(); 
    pth[0].operation = ShapeOperation.SHAPEADD;
    pth[0].closed = true;
    pth[0].entireSubPath = p;
    return  pth;
    }