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MyEx.prototype.coordinateEvent = function(event) {
    p1 = event.getModelPosition();

    var docI = this.getDocumentInterface();
    docI.setRelativeZero(p1);

    //Line
    p2 = p1.operator_add(RVector.createPolar(+1.0, RMath.deg2rad(90)));
    line = Line.createLineEntity(this.getDocument(), p1, p2, Line.LineType.Ray);

    //Add line
    var addOp = new RAddObjectsOperation();
    addOp.addObject(line, false);
    docI.applyOperation(addOp);


    //Delete line
    var delOp = new RDeleteObjectsOperation();
    delOp.deleteObject(line);
    docI.applyOperation(delOp);
}