/*
Author: Randy Phillips
Date: 10/15/2008
Purpose: To access Google's Chart API.
Refer to Google's Chart API for chart type codes, marker type codes, etc.
Docs @ http://code.google.com/apis/chart/
Note: This ctag does not incorporate all the chart types and features available in the API
I have only accessed the most common types of charts, bar, pie, line, etc. 
I felt that adding the entire API would have made the tag unduly complex for charts that may rarely be used.

Examples
---------------------------------------------------------------------------------------
google_chart(
	-title='Vertical Bar Chart', 
	-size='475x250', 
	-type='bvg', 
	-legend=true, 
	-legendPos='l', 
	-data=map('Exp' = '40,30,20', 'Income' = '40,60,59.5', 'Debt' = '20,10,40.5'),
	-axis=map('x' = 'Jan,Feb,Mar', 'y' = '0,25,50,75,100', 't' = 'A,B,C', 'r' = '0,50,100'),
	-colors=array('666666', 'cccccc', 'cc0000'),
	-grid=array(25,25)
	);

google_chart(
	-title='3D Pie Chart', 
	-size='475x250', 
	-type='p3', 
	-legend=true, 
	-legendPos='r', 
	-data=map('Exp' = '40', 'Income' = '40', 'Debt' = '20'),
	-colors=array('cc0000')
	);
		
google_chart(	
	-title='Google Meter',
	-size='475x250', 
	-type='gom',  
	-data=map('Debt-O-Meter' = '45'),
	-colors=array('ffffff', 'cc0000')
	);
	
google_chart(
	-title='Line Chart', 
	-size='475x250', 
	-type='lc', 
	-legend=true, 
	-legendPos='l', 
	-data=map('Exp' = '40,30,20', 'Income' = '40,60,59.5', 'Debt' = '20,10,40.5'),
	-axis=map('x' = 'Jan,Feb,Mar', 'r' = '0,25,50,75,100'),
	-colors=array('666666', 'cccccc', 'cc0000'),
	-marker='d',
	-markerColor='cc0000',
	-markerSize='12',
	-grid=array(0,25)
	);


google_chart(
	-title='Horizontal Stacked Bar Chart', 
	-size='500x175', 
	-type='bhs', 
	-legend=true, 
	-legendPos='t', 
	-data=map('Exp' = '40,30,20', 'Income' = '40,60,59.5', 'Debt' = '20,10,40.5'),
	-axis=map('y' = 'Jan,Feb,Mar', 'x' = '0,25,50,75,100'),
	-colors=array('666666', 'cccccc', 'cc0000'),
	-grid=array(25,25)
	);
	
google_chart(
	-title='Basic Pie Chart', 
	-size='475x250', 
	-type='p', 
	-legend=true, 
	-legendPos='r', 
	-data=map('Exp' = '40', 'Income' = '40', 'Debt' = '20'),
	-colors=array('666666', 'cccccc', 'cc0000'),
	);
	
*/

define_tag( 
        'chart', -namespace='google_',
        -req='type', 
        -req='data', -type='map', 
        -opt='size',
        -opt='title',
        -opt='legend', -type='boolean', 
        -opt='legendPos',
        -opt='colors', -type='array',
        -opt='grid', -type='array', 
        -opt='axis', -type='map', 
        -opt='marker',
        -opt='markerColor',
        -opt='markerSize',
        -encodenone 
    ); 
    
    !local_defined('size') ? local('size') = '250x100';
    !local_defined('legend') ? local('legend') = array;
    !local_defined('colors') ? local('colors') = array;
    !local_defined('grid') ? local('grid') = array;
    !local_defined('title') ? local('title') = string;
    !local_defined('legend') ? local('legend') = false;
    !local_defined('legendPos') ? local('legendPos') = string;
    !local_defined('axis') ? local('axis') = map;
    !local_defined('marker') ? local('marker') = string;
    !local_defined('markerColor') ? local('markerColor') = 'cc0000';
    !local_defined('markerSize') ? local('markerSize') = '8';
    
    local('imgURL') = '';
    
     return(#imgURL); 
     
/define_tag;