Chart.plottingPixelsToScreenPixels Method
        
 Gets the pixel location in screen coordinates for the specified plotting coordinates returned by axes,
 which may be different if the X and Y axes are inverted or for circular charts.
 
         
        Parameters
        
            - xAxisPixel
            
 
            - 
                
Type: Number - May be null
The plotting pixel coordinate for the X axis. 
            - yAxisPixel
            
 
            - 
                
Type: Number - May be null
The plotting pixel coordinate for the Y axis. 
        
        Return Value
        
Type: Object
        
An object with properties:
     x   [type: Number]  - The number of pixels to the right of the left edge of the chart or its border.
     y   [type: Number]  - The number of pixels below the top edge of the chart or its border.