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ParseLength(IXMLNode,String,Single,TSVGUnitFactors) Method

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Parses the XML attribute with the specified name into a length value.

Namespace: FMX.RS.SVGUtils

expandingSyntax

Delphi

 function ParseLength( const Node: IXMLNode; const Name: String; DefValue: Single;
  UnitFactors: TSVGUnitFactors ): Single; overload;
 

Parameters

Node

Type: IXMLNode

Name

Type: String

DefValue

Type: Single

UnitFactors

Type: TSVGUnitFactors

Return Value

Type: Single

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noteNote

A length is a distance measurement, given as a number along with a unit which may be optional.

When a length is used in a style sheet or with a property in a ‘style’ attribute, the syntax must match the following pattern:
length ::= number (~"em" | ~"ex" | ~" px" | ~"in" | ~"cm" | ~"mm" | ~"pt" | ~"pc")?

When a length is used in an SVG presentation attribute, the syntax must match the following pattern:
length ::= number ("em" | "ex" | "px" | "in" | "cm" | "mm" | "pt" | "pc" | "%")?

Note that the non-property definition also allows a percentage unit identifier. The meaning of a percentage length value depends on the attribute for which the percentage length value has been specified. Two common cases are: (a) when a percentage length value represents a percentage of the viewport width or height, and (b) when a percentage length value represents a percentage of the bounding box width or height on a given object.

noteNote

The UnitFactors parameter specifies the unit factors for conversion of string lengths into actual values. For example, if the input string contains '1cm', the function uses the UnitFactors to know how large a centimer is. It is usually set when the DPI property of the TSVGDocument element is set.

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Reference

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RiverSoftAVG SVG Component Library (RSCL) © 2013-2015, Thomas G. Grubb