new DVLine(args)
    A DVisual graph element indicate a line
    Parameters:
| Name | Type | Description | |||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
args | 
            
            Array.<Object> | a array contain arguments below
                Properties
  | 
        
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Example
new DVLine({'beginX':100,'beginY':100,'endX':20,'endY':20,'style':'dash'});
    
    Methods
between(x, y) → {boolean}
    whether the node in the lines's region
    Parameters:
| Name | Type | Description | 
|---|---|---|
x | 
            
            double | the x value of test node | 
y | 
            
            double | the y value of test node | 
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Returns:
    result -whether (x,y) is in the line's region
- Type
 - boolean
 
draw(dv)
    draw the line on dv's canvas
    Parameters:
| Name | Type | Description | 
|---|---|---|
dv | 
            
            DVisual | the Dvisual instance you want to draw | 
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getShadow()
    get the shadow according to the line's direction
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Returns:
    [0,1]