70002174 Add Polygon select on WebControl

Summary

Add Window Polygon and Crossing Polygon select on WebCntrol.

Solution

In version 1001.0.1 new methods was added to vdcanvas object
GetEntitiesInWindowPolygon(pts, coordSystem)
A window polygon selection that
returns an array of vdraw entities that lie entirely inside the specified closed polygon.
Even if a small part of an entity lies outside the polygon, the entity is ignored.
pts:An array of points
coordSystem:The coordinate system of the passed pts
It can get the following values:
0 -or- false -or- undefined for pts are in pixels.
1 -or- true for pts are in WorldCS.
2 for pts are in current View.


and

GetEntitiesFromPolygon(pts, coordSystem)
A crossing polygon selection that
returns an array of vdraw entities that cross the specified closed polygon.
Even if a small part of an entity lies inside the polygon, it is added in the array.
pts: An array of points
coordSystem:The coordinate system of the passed pts
It can get the following values:
0 -or- false -or- undefined for pts are in pixels.
1 -or- true for pts are in WorldCS.
2 for pts are in current View.



Example

Prompt the user to select a polyline and make a polygon selection from selected polyline boundary
  vdcanvas.GetUserPoint(_onActiongetPointEntitySelection);

  function _onActiongetPointEntitySelection5(action, status) {
            var vdcanvas = action.vdrawOwner();
            if (status == 'start') {
                vdcanvas.Prompt('pick an polyline that defines a close polygon for selection');
            } else if (status == 'end') {
                vdcanvas.Prompt('');
                if (!action.IsCanceled()) {
                    var pt = vdcanvas.WorldToPixel([action.ResValue[X], action.ResValue[Y], 0]);
                    var entity = vdcanvas.GetEntityFromPoint(pt[X], pt[Y]); //scan for an entity under the pick point
                    if (!entity || entity._t !== vdConst.vdPolyline_code) return; //check if entity exist and is a polyline type
                    var pts = vdcanvas.GetEntitySamplePoints(entity); //get the points of selected curve in world coordinate system
                    var ents = vdcanvas.GetEntitiesFromPolygon(pts, 1); //for crossing  polyon select
                    //var ents = vdcanvas.GetEntitiesInWindowPolygon(pts, 1); //for window polygon select
                    if (ents) {
                        for (var i = 0; i < ents.length; i++) ents[i].HighLight = true; //highlight the selected figures
                        setTimeout(vdcanvas.redraw); //post a redraw
                    }
                }
            }
        }

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