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SVG length interface
The SVGLength
interface correspond to the <length> basic data type.
An SVGLength
object can be designated as read only, which means that attempts to modify the object will result in an exception being thrown.
Interface overview
Also implement | None |
---|---|
Methods |
|
Properties |
|
Constants |
|
Normative document | SVG 1.1 (2nd Edition) |
Example
<!--?xml version="1.0"?--> <svg height="200" onload="start();" version="1.1" width="200" xmlns="https://www.w3.org/2000/svg"> <script type="text/javascript"><![CDATA[ function start() { var rect = document.getElementById("myRect"); var val = rect.x.baseVal; // read x in pixel and cm units console.log("value: " + val.value + ", valueInSpecifiedUnits: " + val.unitType + ": " + val.valueInSpecifiedUnits + ", valueAsString: " + val.valueAsString); // set x = 20pt and read it out in pixel and pt units val.newValueSpecifiedUnits(SVGLength.SVG_LENGTHTYPE_PT, 20); console.log("value: " + val.value + ", valueInSpecifiedUnits " + val.unitType + ": " + val.valueInSpecifiedUnits + ", valueAsString: " + val.valueAsString); // convert x = 20pt to inches and read out in pixel and inch units val.convertToSpecifiedUnits(SVGLength.SVG_LENGTHTYPE_IN); console.log("value: " + val.value + ", valueInSpecifiedUnits " + val.unitType + ": " + val.valueInSpecifiedUnits + ", valueAsString: " + val.valueAsString); } ]]></script> <rect fill="green" height="1cm" id="myRect" stroke="black" stroke-width="1" width="1cm" x="1cm" y="1cm"/> </svg>
Results on a desktop monitor (pixel units will be dpi dependent):
value: 37.7952766418457, valueInSpecifiedUnits: 6: 1, valueAsString: 1cm value: 26.66666603088379, valueInSpecifiedUnits 9: 20, valueAsString: 20pt value: 26.66666603088379, valueInSpecifiedUnits 8: 0.277777761220932, valueAsString: 0.277778in
Constants
Name | Value | Description |
---|---|---|
SVG_LENGTHTYPE_UNKNOWN |
0 | The unit type is not one of predefined unit types. It is invalid to attempt to define a new value of this type or to attempt to switch an existing value to this type. |
SVG_LENGTHTYPE_ NUMBER |
1 | No unit type was provided (i.e., a unitless value was specified), which indicates a value in user units. |
SVG_LENGTHTYPE_ PERCENTAGE |
2 | A percentage value was specified. |
SVG_LENGTHTYPE_ EMS |
3 | A value was specified using the em units defined in CSS2. |
SVG_LENGTHTYPE_ EXS |
4 | A value was specified using the ex units defined in CSS2. |
SVG_LENGTHTYPE_ PX |
5 | A value was specified using the px units defined in CSS2. |
SVG_LENGTHTYPE_ CM |
6 | A value was specified using the cm units defined in CSS2. |
SVG_LENGTHTYPE_ MM |
7 | A value was specified using the mm units defined in CSS2. |
SVG_LENGTHTYPE_ IN |
8 | A value was specified using the in units defined in CSS2. |
SVG_LENGTHTYPE_ PT |
9 | A value was specified using the pt units defined in CSS2. |
SVG_LENGTHTYPE_ PC |
10 | A value was specified using the pc units defined in CSS2. |
Properties
Name | Type | Description |
---|---|---|
unitType |
unsigned short | The type of the value as specified by one of the SVG_LENGTHTYPE_* constants defined on this interface. |
value |
float |
The value as a floating point value, in user units. Setting this attribute will cause Exceptions on setting: a |
valueInSpecifiedUnits |
float |
The value as a floating point value, in the units expressed by Exceptions on setting: a |
valueAsString |
DOMString |
The value as a string value, in the units expressed by Exceptions on setting:
|
Methods
Name & Arguments | Return | Description |
---|---|---|
newValueSpecifiedUnits(in unsigned short unitType, in float valueInSpecifiedUnits) |
void |
Reset the value as a number with an associated unitType, thereby replacing the values for all of the attributes on the object. Exceptions:
|
convertToSpecifiedUnits(in unsigned short unitType) |
void | Preserve the same underlying stored value, but reset the stored unit identifier to the given unitType . Object attributes unitType , valueInSpecifiedUnits and valueAsString might be modified as a result of this method. For example, if the original value were "0.5cm" and the method was invoked to convert to millimeters, then the unitType would be changed to SVG_LENGTHTYPE_MM , valueInSpecifiedUnits would be changed to the numeric value 5 and valueAsString would be changed to "5mm". |
Browser compatibility
Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
---|---|---|---|---|---|
Basic support | ? | ? | ? | ? | ? |
Feature | Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
---|---|---|---|---|---|
Basic support | Not supported | ? | ? | ? | ? |