Difference between revisions of "Operator Element"
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Property Elements are a subgroup of the elements in the [[:Category: Oblivion XML|Oblivion XML]] schema, always found as children of [[Property Element]]s. They are used to create mathematical formulas, which the game engine can evaluate to obtain a value for the parent property. | |||
== | There is, generally speaking, an Operator Element for every basic ''binary'' mathematical operator - every operator that takes exactly two operands. The first operand is always the current value of the property, and the second is the contents of the operator. For example: | ||
<image> | |||
<x> | |||
<add> 1 </add> <!-- Add one to current x position --> | |||
</x> | |||
</image> | |||
A property element may contain a series of Operators, which are evaluated in order: | |||
<image> | |||
<x> | |||
<!-- New X = (X + 10) * 2 --> | |||
<add> 10 </add> | |||
<mult> 2 </mult> | |||
</x> | |||
</image> | |||
Operator Elements may contain other operator elements as children: | |||
<image> | |||
<x> | |||
<!-- New X = X + (10 / 3) --> | |||
<add> | |||
<copy> 10 </copy> | |||
<div> 3 </div> | |||
</add> | |||
</x> | |||
</image> | |||
Operator Elements may contain the value of a property for some other element somewhere in the menu: | |||
<image> | |||
<x> | |||
<!-- Place this image 10 pixels to the right of the "ExitButton" element --> | |||
<copy src="ExitButton" trait="x"/> | |||
<add src="ExitButton" trait="width"/> | |||
<add> 10 </add> | |||
</x> | |||
</image> | |||
== Algebraic == | == Copy == | ||
The only unary (single-operand) operator. The <copy> operator ''replaces'' the current property value with its contents: | |||
<image> | |||
<x> | |||
<!-- Set the current x position to be 50 pixels --> | |||
<Copy> 50 </Copy> | |||
</x> | |||
</image> | |||
== Algebraic Operators == | |||
*Add | *Add | ||
*Sub | *Sub | ||
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*Div | *Div | ||
== | == Boolean Operators == | ||
*Onlyif | *Onlyif | ||
*Onlyifnot | *Onlyifnot | ||