new DVMulBarChart(args)
    
    A DVisual graph element indicate a Muliple Bar Chart
    Parameters:
    
    
    
        
        | Name | 
        
        Type | 
        
        
        Description | 
    
    
    
    
        
            
                args | 
            
            
            
                
Object
            
             | 
            
            
            a array contain arguments below
                Properties
                
    
    
        
        | Name | 
        
        Type | 
        
        Attributes | 
        
        
        Default | 
        
        Description | 
     
    
    
    
        
            
                X | 
            
            
            
                
Array(string)
            
             | 
            
                
                
                
                
                 | 
            
            
                
                
                 | 
            
            a list of string for each x-label | 
         
    
        
            
                Ys | 
            
            
            
                
Array(Array(double))
            
             | 
            
                
                
                
                
                 | 
            
            
                
                
                 | 
            
            2d Array,indicate a series bar value for each x-label. | 
         
    
        
            
                Z | 
            
            
            
                
Array(string)
            
             | 
            
                
                
                
                
                 | 
            
            
                
                
                 | 
            
            a list of string indicate each kind of bar | 
         
    
        
            
                legendOuterBox | 
            
            
            
                
boolean
            
             | 
            
                
                
                    <optional> 
                
                
                
                 | 
            
            
                
                
                    true
                
                 | 
            
            whether draw the outer box of legend | 
         
    
        
            
                colors | 
            
            
            
                
Array(DVColor)
            
             | 
            
                
                
                    <optional> 
                
                
                
                 | 
            
            
                
                
                    DVgetRandomColor(this.args['Z'].length)
                
                 | 
            
            a series of DVColor indicate each kind of bar. | 
         
    
        
            
                xGrid | 
            
            
            
                
boolean
            
             | 
            
                
                
                    <optional> 
                
                
                
                 | 
            
            
                
                
                    false
                
                 | 
            
            whether draw the grid line started from X axes | 
         
    
        
            
                yGrid | 
            
            
            
                
boolean
            
             | 
            
                
                
                    <optional> 
                
                
                
                 | 
            
            
                
                
                    true
                
                 | 
            
            whether draw the grid line started from Y axes | 
         
    
        
            
                xDescript | 
            
            
            
                
string
            
             | 
            
                
                
                    <optional> 
                
                
                
                 | 
            
            
                
                
                    'x'
                
                 | 
            
            the X axes's description | 
         
    
        
            
                yDescript | 
            
            
            
                
string
            
             | 
            
                
                
                    <optional> 
                
                
                
                 | 
            
            
                
                
                    'y'
                
                 | 
            
            the Y axes's description | 
         
    
    
 
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    - Source:
 
    
    
    
    
    
    
     
    
    
    
     
    
    
    
        Methods
        
            
    
    draw(dv)
    
    draw the DVMulLineChart on dv's canvas
    Parameters:
    
    
    
        
        | Name | 
        
        Type | 
        
        
        Description | 
    
    
    
    
        
            
                dv | 
            
            
            
                
DVisual
            
             | 
            
            
            the Dvisual instance you want to draw | 
        
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    - Source:
 
    
    
    
    
    
        
            
    
    prepare(dv)
    
    prepare the needed elements on the first time to draw it
    Parameters:
    
    
    
        
        | Name | 
        
        Type | 
        
        
        Description | 
    
    
    
    
        
            
                dv | 
            
            
            
                
DVisual
            
             | 
            
            
            the Dvisual instance you want to draw | 
        
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    
    - Source: