**ShowPlay Reference Manual, Chapter 3 (ControlVariables): sx0/sy0**
===== SX0/SY0 -- Image display horizontal/vertical center =====
SX0 and SY0 are integer numbers. 
Showplay uses SX0 and SY0 as the horizontal and vertical center pixel position for all visual stimuli that are to be centered in the display.

The default value for SX0 is 1/2 the paradigm display screen width. The default value for SX0 is 1/2 the screen height.

For physical screen center coordinates see [[jvs:cigal:showplay:manual:chapter3:dx1|Dx1/Dy1]]. For dual screen displays, see [[jvs:cigal:showplay:manual:chapter3:dx1|Dx2/Dy2]] for the center coordinates of the secondary display screen.

**See Also:**\\
[[jvs:cigal:showplay:manual:chapter1:scaledisplay|Display Scaling]], 
[[jvs:cigal:showplay:manual:chapter3:widscale|Widscale]], 
[[jvs:cigal:showplay:manual:chapter3:hgtscale|Hgtscale]],
[[jvs:cigal:showplay:manual:chapter3:rgbscale|RGBscale]],
[[jvs:cigal:showplay:manual:chapter3:dx1|Dx1/Dy1]],
[[jvs:cigal:showplay:manual:chapter3:dx2|Dx2/Dy2]]

[[jvs:cigal|CIGAL Home]], 
[[jvs:cigal:manual|CIGAL Manual]], 
[[jvs:cigal:showplay|ShowPlay Home]], 
[[jvs:cigal:showplay:manual|ShowPlay Manual]], 
[[jvs:cigal:showplay:manual:chapter3|InputParameters List]], 
[[jvs:cigal:showplay:manual:help|Manual Help]]