This element specifies the precense of a shape guide that will be used to govern the geometry of the specified shape. A shape guide consists of a formula and a name that the result of the formula is assigned to. Recognized formulas are listed with the fmla attribute documentation for this element.
[Note: The order in which guides are specified determines the order in which their values will be calculated. For instance it is not possible to specify a guide that uses another guides result when that guide has not yet been calculated. end note]
[Example: Consider the case where the user would like to specify a triangle with it's bottom edge defined not by static points but by using a varying parameter, namely an guide. Consider the diagrams and DrawingML shown below. This first triangle has been drawn with a bottom edge that is equal to the 2/3 the value of the shape height. Thus we see in the figure below that the triangle appears to occupy 2/3 of the vertical space within the shape bounding box.
<a:xfrm>
<a:off x="3200400" y="1600200"/>
<a:ext cx="1705233" cy="679622"/>
</a:xfrm>
<a:custGeom>
<a:avLst/>
<a:gdLst>
<a:gd name="myGuide" fmla="*/ h 2 3"/>
</a:gdLst>
<a:ahLst/>
<a:cxnLst/>
<a:rect l="0" t="0" r="0" b="0"/>
<a:pathLst>
<a:path w="1705233" h="679622">
<a:moveTo>
<a:pt x="0" y="myGuide"/>
</a:moveTo>
<a:lnTo>
<a:pt x="1705233" y="myGuide"/>
</a:lnTo>
<a:lnTo>
<a:pt x="852616" y="0"/>
</a:lnTo>
<a:close/>
</a:path>
</a:pathLst>
</a:custGeom>
If however we change the guide to half that, namely 1/3. Then we see the entire bottom edge of the triangle move to now only occupy 1/3 of the toal space within the shape bounding box. This is because both of the bottom points in this triangle depend on this guide for their coordinate positions. The triangle and corresponding DrawingML shown below illustrate this point.
<a:gdLst>
<a:gd name="myGuide" fmla="*/ h 1 3"/>
</a:gdLst>
end example]
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Parent Elements |
|
Attributes |
Description |
|
fmla (Shape Guide Formula) |
Specifies the formula that will be used to calculate the value for a guide. Each formula has a certain number of arguments and a specific set of operations to perform on these arguments in order to generate a value for a guide. There are a total of 17 different formulas available. These are shown below with the usage for each defined. ('*/') - Multiply Divide Formula Arguments: 3 (fmla="*/ x y z") Usage: "*/ x y z" = ((x * y) / z) = value of this guide ('+-') - Add Subtract Formula Arguments: 3 (fmla="+- x y z") Usage: "+- x y z" = ((x + y) - z) = value of this guide ('+/') - Add Divide Formula Arguments: 3 (fmla="+/ x y z") Usage: "+/ x y z" = ((x + y) / z) = value of this guide ('?:') - If Else Formula Arguments: 3 (fmla="?: x y z") Usage: "?: x y z" = if (x > 0), then y = value of this guide, else z = value of this guide ('abs') - Absolute Value Formula Arguments: 1 (fmla="abs x") Usage: "abs x" = if (x < 0), then (-1) * x = value of this guide else x = value of this guide ('at2') - ArcTan Formula Arguments: 2 (fmla="at2 x y") Usage: "at2 x y" = arctan(y / x) = value of this guide ('cat2') - Cosine ArcTan Formula Arguments: 3 (fmla="cat2 x y z") Usage: "cat2 x y z" = (x*(cos(arctan(z / y))) = value of this guide ('cos') - Cosine Formula Arguments: 2 (fmla="cos x y") Usage: "cos x y" = (x * cos( y )) = value of this guide ('max') - Maximum Value Formula Arguments: 2 (fmla="max x y") Usage: "max x y" = if (x > y), then x = value of this guide ('min') - Minimum Value Formula Arguments: 2 (fmla="min x y") Usage: "min x y" = if (x < y), then x = value of this guide ('mod') - Modulo Formula Arguments: 3 (fmla="mod x y z") Usage: "mod x y z" = sqrt(x^2 + b^2 + c^2) = value of this guide ('pin') - Pin To Formula Arguments: 3 (fmla="pin x y z") Usage: "pin x y z" = if (y < x), then x = value of this guide else if (y > z), then z = value of this guide ('sat2') - Sine ArcTan Formula Arguments: 3 (fmla="sat2 x y z") Usage: "sat2 x y z" = (x*sin(arctan(z / y))) = value of this guide ('sin') - Sine Formula Arguments: 2 (fmla="sin x y") Usage: "sin x y" = (x * sin( y )) = value of this guide ('sqrt') - Square Root Formula Arguments: 1 (fmla="sqrt x") Usage: "sqrt x" = sqrt(x) = value of this guide ('tan') - Tangent Formula Arguments: 2 (fmla="tan x y") Usage: "tan x y" = (x * tan( y )) = value of this guide ('val') - Literal Value Formula Usage: "val x" = x = value of this guide
[Note: Guides that have a literal value formula specified via fmla="val x" above should only be used within the avLst as an adjust value for the shape. This however is not strictly enforced. end note]
The possible values for this attribute are defined by the ST_GeomGuideFormula simple type (§5.1.12.25). |
|
name (Shape Guide Name) |
Specifies the name that will be used to reference to this guide. This name may be used just as a variable would within an equation. That is this name may be substituted for literal values within other guides or the specification of the shape path.
The possible values for this attribute are defined by the ST_GeomGuideName simple type (§5.1.12.26). |
The following XML Schema fragment defines the contents of this element:
<complexType name="CT_GeomGuide">
<attribute name="name" type="ST_GeomGuideName" use="required"/>
<attribute name="fmla" type="ST_GeomGuideFormula" use="required"/>
</complexType>