preserveAspectRatio
O atributo preserveAspectRatio
indica como um elemento com uma viewBox, fornecendo uma determinada proporção deve se ajustar a uma viewport com uma proporção diferente.
Because the aspect ratio of an SVG image is defined by the viewBox
attribute, if this attribute isn't set, the preserveAspectRatio
attribute has no effect (with one exception, the <image>
element, as described below).
Example
<svg viewBox="-1 -1 162 92" xmlns="https://www.w3.org/2000/svg">
<defs>
<path
id="smiley"
d="M50,10 A40,40,1,1,1,50,90 A40,40,1,1,1,50,10 M30,40 Q36,35,42,40 M58,40 Q64,35,70,40 M30,60 Q50,75,70,60 Q50,75,30,60" />
</defs>
<!-- (width>height) meet -->
<svg
preserveAspectRatio="xMidYMid meet"
x="0"
y="0"
viewBox="0 0 100 100"
width="20"
height="10">
<use href="#smiley" />
</svg>
<svg
preserveAspectRatio="xMinYMid meet"
x="25"
y="0"
viewBox="0 0 100 100"
width="20"
height="10">
<use href="#smiley" />
</svg>
<svg
preserveAspectRatio="xMaxYMid meet"
x="50"
y="0"
viewBox="0 0 100 100"
width="20"
height="10">
<use href="#smiley" />
</svg>
<!-- (width>height) slice -->
<svg
preserveAspectRatio="xMidYMin slice"
x="0"
y="15"
viewBox="0 0 100 100"
width="20"
height="10">
<use href="#smiley" />
</svg>
<svg
preserveAspectRatio="xMidYMid slice"
x="25"
y="15"
viewBox="0 0 100 100"
width="20"
height="10">
<use href="#smiley" />
</svg>
<svg
preserveAspectRatio="xMidYMax slice"
x="50"
y="15"
viewBox="0 0 100 100"
width="20"
height="10">
<use href="#smiley" />
</svg>
<!-- (width<height) meet -->
<svg
preserveAspectRatio="xMidYMin meet"
x="75"
y="0"
viewBox="0 0 100 100"
width="10"
height="25">
<use href="#smiley" />
</svg>
<svg
preserveAspectRatio="xMidYMid meet"
x="90"
y="0"
viewBox="0 0 100 100"
width="10"
height="25">
<use href="#smiley" />
</svg>
<svg
preserveAspectRatio="xMidYMax meet"
x="105"
y="0"
viewBox="0 0 100 100"
width="10"
height="25">
<use href="#smiley" />
</svg>
<!-- (width<height) slice -->
<svg
preserveAspectRatio="xMinYMid slice"
x="120"
y="0"
viewBox="0 0 100 100"
width="10"
height="25">
<use href="#smiley" />
</svg>
<svg
preserveAspectRatio="xMidYMid slice"
x="135"
y="0"
viewBox="0 0 100 100"
width="10"
height="25">
<use href="#smiley" />
</svg>
<svg
preserveAspectRatio="xMaxYMid slice"
x="150"
y="0"
viewBox="0 0 100 100"
width="10"
height="25">
<use href="#smiley" />
</svg>
<!-- none -->
<svg
preserveAspectRatio="none"
x="0"
y="30"
viewBox="0 0 100 100"
width="160"
height="60">
<use href="#smiley" />
</svg>
</svg>
Syntax
preserveAspectRatio="<align> [<meetOrSlice>]"
Its value is made of one or two keywords: A required alignment value and an optional "meet or slice" reference as described below:
- Alignment value
-
The alignment value indicates whether to force uniform scaling and, if so, the alignment method to use in case the aspect ratio of the
viewBox
doesn't match the aspect ratio of the viewport. The alignment value must be one of the following keywords:- none
Do not force uniform scaling. Scale the graphic content of the given element non-uniformly if necessary such that the element's bounding box exactly matches the viewport rectangle. Note that if
<align>
isnone
, then the optional<meetOrSlice>
value is ignored. - xMinYMin - Force uniform scaling.
Align the
<min-x>
of the element'sviewBox
with the smallest X value of the viewport. Align the<min-y>
of the element'sviewBox
with the smallest Y value of the viewport. - xMidYMin - Force uniform scaling.
Align the midpoint X value of the element's
viewBox
with the midpoint X value of the viewport. Align the<min-y>
of the element'sviewBox
with the smallest Y value of the viewport. - xMaxYMin - Force uniform scaling.
Align the
<min-x>+<width>
of the element'sviewBox
with the maximum X value of the viewport. Align the<min-y>
of the element'sviewBox
with the smallest Y value of the viewport. - xMinYMid - Force uniform scaling.
Align the
<min-x>
of the element'sviewBox
with the smallest X value of the viewport. Align the midpoint Y value of the element'sviewBox
with the midpoint Y value of the viewport. - xMidYMid (the default) - Force uniform scaling.
Align the midpoint X value of the element's
viewBox
with the midpoint X value of the viewport. Align the midpoint Y value of the element'sviewBox
with the midpoint Y value of the viewport. - xMaxYMid - Force uniform scaling.
Align the
<min-x>+<width>
of the element'sviewBox
with the maximum X value of the viewport. Align the midpoint Y value of the element'sviewBox
with the midpoint Y value of the viewport. - xMinYMax - Force uniform scaling.
Align the
<min-x>
of the element'sviewBox
with the smallest X value of the viewport. Align the<min-y>+<height>
of the element'sviewBox
with the maximum Y value of the viewport. - xMidYMax - Force uniform scaling.
Align the midpoint X value of the element's
viewBox
with the midpoint X value of the viewport. Align the<min-y>+<height>
of the element'sviewBox
with the maximum Y value of the viewport. - xMaxYMax - Force uniform scaling.
Align the
<min-x>+<width>
of the element'sviewBox
with the maximum X value of the viewport. Align the<min-y>+<height>
of the element'sviewBox
with the maximum Y value of the viewport.
- none
Do not force uniform scaling. Scale the graphic content of the given element non-uniformly if necessary such that the element's bounding box exactly matches the viewport rectangle. Note that if
- Meet or slice reference
-
The meet or slice reference is optional and, if provided, must be one of the following keywords:
-
meet (the default) - Scale the graphic such that:
- aspect ratio is preserved
- the entire
viewBox
is visible within the viewport - the
viewBox
is scaled up as much as possible, while still meeting the other criteria
In this case, if the aspect ratio of the graphic does not match the viewport, some of the viewport will extend beyond the bounds of the
viewBox
(i.e., the area into which theviewBox
will draw will be smaller than the viewport). -
slice - Scale the graphic such that:
- aspect ratio is preserved
- the entire viewport is covered by the
viewBox
- the
viewBox
is scaled down as much as possible, while still meeting the other criteria
In this case, if the aspect ratio of the
viewBox
does not match the viewport, some of theviewBox
will extend beyond the bounds of the viewport (i.e., the area into which theviewBox
will draw is larger than the viewport).
-
Elements
feImage
For <feImage>
, preserveAspectRatio
defines how the referenced image should fit in the rectangle define by the <feImage>
element.
Value | <align> <meetOrSlice>? |
---|---|
Default value | xMidYMid meet |
Animatable | Yes |
image
For <image>
, preserveAspectRatio
defines how the referenced image should fit in the rectangle define by the <image>
element.
Value | <align> <meetOrSlice>? |
---|---|
Default value | xMidYMid meet |
Animatable | Yes |
marker
For <marker>
, preserveAspectRatio
indicates if a uniform scaling must be performed to fit the element viewport.
Value | <align> <meetOrSlice>? |
---|---|
Default value | xMidYMid meet |
Animatable | Yes |
pattern
For <pattern>
, preserveAspectRatio
indicates if a uniform scaling must be performed to fit the element viewport.
Value | <align> <meetOrSlice>? |
---|---|
Default value | xMidYMid meet |
Animatable | Yes |
svg
For <svg>
, preserveAspectRatio
indicates if a uniform scaling must be performed to fit the element viewport.
Value | <align> <meetOrSlice>? |
---|---|
Default value | xMidYMid meet |
Animatable | Yes |
symbol
For <symbol>
, preserveAspectRatio
indicates if a uniform scaling must be performed to fit the element viewport.
Value | <align> <meetOrSlice>? |
---|---|
Default value | xMidYMid meet |
Animatable | Yes |
view
For <view>
, preserveAspectRatio
indicates if a uniform scaling must be performed to fit the element viewport.
Value | <align> <meetOrSlice>? |
---|---|
Default value | xMidYMid meet |
Animatable | Yes |
Especificações
Specification |
---|
Filter Effects Module Level 1 # element-attrdef-feimage-preserveaspectratio |
Scalable Vector Graphics (SVG) 2 # PreserveAspectRatioAttribute |