XY table

XY tables are based on the 'ST_PROF_XYTAB' structure. They support the definition of a function y=f(x) with any x axis resolution.

In the table structure, the x and y values of the function y=f(x) are described by 'uiNoElement'+1 pair of values.

 

Tabelle 2: CAM_PROF: Table structure of the XY table

Header information:	enType = PROF_XYTAB	uiNoElement
	udMasterInc (not used)
Interpolation points:	stElement[0].diX = 0
	stElement[0].diY = 0
	stElement[1].diX
	stElement[1].diY
	...
	stElement[180].diX
	stElement[180].diY

 

Limiting to 'uiNoElement' = 180 is negated by mode 'enType' = PROF_XYTAB_NL

 

Abbildung 5: CAM_PROF: Principle of the function interpolator with XY table

 

Advantages of the XY table

• Since the point spacing can be freely defined, the point density can be adapted to the curvature of the curve
• Only the start and end points need to be specified to describe linear sections

Disadvantages of the XY table

• Fewer points, since both x and y values must be specified
• Lack of transparency in presentation based on pairs of points