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+The following variables are provided by the library:
+|Name|Type|Description|
+|---|---|---|
+|s.W|float|The current width of the canvas|
+|s.H|float|The current height of the canvas|
+|s.CENTERX|float|Horizontal center of the canvas (W/2)|
+|s.CENTERY|float|Vertical center of the canvas (H/2)|
+|s.MX|float|Mouse/Touch X|
+|s.MY|float|Mouse/Touch Y|
+|s.T|float|Seconds elapsed since start|
+
+They can be used anywhere in the code, however you need to run s.start() first
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