svgvisualresourcetoolkit.java

完全基于java开发的svg矢量绘图工具

                        suffix=bundle.getString("vresource_duplicatednodesuffix");
                    }catch (Exception ex){}
                }
                
                //creating the new id
                String id=resource.getAttribute("id");
                id=frame.getId(id+suffix);
                
                //setting the id
                resource.setAttribute("id", id);
            }
        }
        
        return resource;
    }
    
    /**
     * removes the given resource node
     * @param frame the current frame
     * @param resourceNode the resource node
     */
    protected void removeVisualResource(SVGFrame frame, Element resourceNode){
    
        if(frame!=null && resourceNode!=null){

            Element parentNode=(Element)resourceNode.getParentNode();
            
            if(parentNode!=null){
            	
                //removing the node from its parent
                parentNode.removeChild(resourceNode);
            }
        }
    }
    
    /**
     * appends the givn resource node to the given parent node
     * @param frame a frame 
     * @param parentNode a parent node
     * @param resourceNode a resource node
     */
    protected void appendVisualResource(SVGFrame frame, Element parentNode, Element resourceNode){
        
        if(frame!=null && parentNode!=null && resourceNode!=null){

            String id=resourceNode.getAttribute("id");
            
            if(! frame.checkId(id)){
                
                id=frame.getId(id);
            }

            //removing the node from its parent
            parentNode.appendChild(resourceNode);
        }
    }


    
    /**
     * whether the given node can be removed or not
     * @param frame the current frame
     * @param resourceNode the resource node
     * @return whether the given node can be removed or not
     */
    protected boolean canRemoveVisualResource(SVGFrame frame, Element resourceNode){
        
        if(frame!=null && resourceNode!=null){

            String id=resourceNode.getAttribute("id");
            
            if(! frame.isResourceUsed(id)){
                
                return true;
            }
        }
        
        return false;
    }
    
    /**
     * imports a resource node from the resource store
     * @param frame the current frame
     * @param parentNode the parentNode
     * @param nodeToBeImported the node that should be imported
     * @return the imported node
     */
    protected Element importVisualResource(SVGFrame frame, Element parentNode, Element nodeToBeImported){
        
        Element resourceNode=null;
        Document visualResourceStore=getVisualResources().getVisualResourceStore();
        ResourceBundle bundle=getVisualResources().getBundle();
        
        if(frame!=null && parentNode!=null && visualResourceStore!=null && nodeToBeImported!=null){
  
            final Element defs=getVisualResources().getDefs(frame);

            if(defs!=null){
                
                Document doc=defs.getOwnerDocument();
                resourceNode=(Element)doc.importNode(nodeToBeImported, true);
                
                //getting the base string for the id
                String baseId=resourceNode.getNodeName(), importedLabel="";

                if(bundle!=null){
                    
                    try{
                        importedLabel=bundle.getString("labelimported");
                        baseId="vresourcename_".concat(baseId);
                        baseId=bundle.getString(baseId);
                        baseId=importedLabel.concat(baseId);
                        baseId=baseId.replaceAll("\\s+", "");
                    }catch (Exception ex){baseId=resourceNode.getNodeName();}
                }
                
                String id=frame.getId(baseId);
                resourceNode.setAttribute("id", id);
            }
        }
        
        return resourceNode;
    }
    
    /**
     * gets the attribute node of the parent node given its name or creates it if it does not exist
     * @param frame the current frame
     * @param parentNode the parent node
     * @param name the name of the attribute
     * @param value the value of the attribute if it is created
     * @return the attribute node
     */
    public Node getVisualResourceAttributeNode(SVGFrame frame, Element parentNode, String name, String value){
        
        Node attNode=null;
        
        if(frame!=null && parentNode!=null && name!=null && ! name.equals("")){

            //gets the attribute node if it exists
            attNode=parentNode.getAttributeNode(name);

            if(attNode==null){
                
                //if the attribute node does not exist, it is created
                if(value==null){
                    
                    value="";
                }
                
                attNode=parentNode.getOwnerDocument().createAttribute(name);
                attNode.setNodeValue(value);

                //appends the element to the resource node
                parentNode.setAttributeNode((Attr)attNode);
            }
        }

        return attNode;
    }
    
    /**
     * creates a child of a resource node given its parent
     * @param frame the current frame
     * @param parentNode the parentNode to which the child will be appended
     * @return the element corresponding to a child of a resource whose name is nodeName
     */
    protected Element createVisualResourceChildStructure(SVGFrame frame, Node parentNode){
        
        Element resourceChild=null;
        
        if(frame!=null && parentNode!=null){
            
            //creates the resource child
            if(parentNode.getNodeName().equals("linearGradient") || parentNode.getNodeName().equals("radialGradient")){

        		String svgNS=SVGDOMImplementation.SVG_NAMESPACE_URI;
                resourceChild=parentNode.getOwnerDocument().createElementNS(svgNS, "stop");
                resourceChild.setAttributeNS(null, "offset", "0%");
                resourceChild.setAttributeNS(null, "style", "stop-color:#000000;stop-opacity:1.0;");
            }
        }
        
        return resourceChild;
    }
    
    /**
     * appends a child of a resource node to its parent
     * @param frame the current frame
     * @param parentNode the parentNode to which the child will be appended
     * @param childNode the child of a resource node
     */
    protected void appendVisualResourceChild(SVGFrame frame, Node parentNode, Node childNode){

        if(frame!=null && parentNode!=null && childNode!=null){
            
            //creates the resource child
            if(parentNode.getNodeName().equals("linearGradient") || parentNode.getNodeName().equals("radialGradient")){

                //appends the element to the resource node
                parentNode.appendChild(childNode);
            }
        }
    }
    
    /**
     * removes the child node from the dom
     * @param frame a frame
     * @param childNode the node to be removed
     */
    protected void removeVisualResourceChild(SVGFrame frame, Node childNode){
        
        if(frame!=null && childNode!=null){
            
            final Node parentNode=childNode.getParentNode();
            final Node fchildNode=childNode;
            
            if(parentNode!=null){
                
                parentNode.removeChild(fchildNode);
            }
        }
    }
}