hV_Graphics​ — Gauge

The gauge graphic displays one value on a circular dial.

The gGauge is a class and contains, apart from the constructor, two functions: dDefine and draw.

Temporary minimum and maximum values can be noticed with a green and red dot. All parameters are integers with an optional unit.

A gauge is declared with the gGauge class:

    









The gGauge class has two functions:
  • define, with related screen, coordinates and radius of the graphic, minimum and maximum values, and optional unit, memory, grid, front and back colours, grid colour, value colour, minimum and maximum colours:



					
										
					
						




					
							

		
	






	

    

        

    

    

        

    










	

		
			

				
					
						


  • draw, with a value and an optional message:




	

    

        

    

    

        

    









If the optional message is empty, nothing is displayed.

On the example shown on the right, the green and red dots are for the local minimum and maximum. The memory parameter sets how long they are kept, here up to 8 updates.



					
										
					
						




					
							

		
	






	

		
			

				
					
						


The new library uses integers only to save memory (no need for the 6KB real library!) and processing power. 

The graphic is updated only if the value passed is different from the previous one. This allows smoother graphics and faster drawing.