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SVGTransform - Web APIs 编辑

SVG transform interface

SVGTransform is the interface for one of the component transformations within an SVGTransformList; thus, an SVGTransform object corresponds to a single component (e.g., scale(…) or matrix(…)) within a transform attribute.

An SVGTransform 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	`void setMatrix(in SVGMatrix matrix)` `void setTranslate(in float tx, in float ty)` `void setScale(in float sx, in float sy)` `void setRotate(in float angle, in float cx, in float cy)` `void setSkewX(in float angle)` `void setSkewY(in float angle)`
Properties	readonly unsigned short `type` readonly float `angle` readonly `SVGMatrix` `matrix`
Constants	`SVG_TRANSFORM_UNKNOWN` = 0 `SVG_TRANSFORM_MATRIX` = 1 `SVG_TRANSFORM_TRANSLATE` = 2 `SVG_TRANSFORM_SCALE` = 3 `SVG_TRANSFORM_ROTATE` = 4 `SVG_TRANSFORM_SKEWX` = 5 `SVG_TRANSFORM_SKEWY` = 6
Normative document	SVG 1.1 (2nd Edition)

Constants

Name	Value	Description
`SVG_TRANSFORM_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_TRANSFORM_MATRIX`	1	A `matrix(…)` transformation
`SVG_TRANSFORM_TRANSLATE`	2	A `translate(…)` transformation
`SVG_TRANSFORM_SCALE`	3	A `scale(…)` transformation
`SVG_TRANSFORM_ROTATE`	4	A `rotate(…)` transformation
`SVG_TRANSFORM_SKEWX`	5	A `skewx(…)` transformation
`SVG_TRANSFORM_SKEWY`	6	A `skewy(…)` transformation

Properties

Name Type Description

type unsigned short The type of the value as specified by one of the SVG_TRANSFORM_* constants defined on this interface.

angle float A convenience attribute for SVG_TRANSFORM_ROTATE, SVG_TRANSFORM_SKEWX and SVG_TRANSFORM_SKEWY. It holds the angle that was specified.

For SVG_TRANSFORM_MATRIX, SVG_TRANSFORM_TRANSLATE and SVG_TRANSFORM_SCALE, angle will be zero.

Name	Type	Description
`type`	unsigned short	The type of the value as specified by one of the SVG_TRANSFORM_* constants defined on this interface.
`angle`	float	A convenience attribute for `SVG_TRANSFORM_ROTATE`, `SVG_TRANSFORM_SKEWX` and `SVG_TRANSFORM_SKEWY`. It holds the angle that was specified. For `SVG_TRANSFORM_MATRIX`, `SVG_TRANSFORM_TRANSLATE` and `SVG_TRANSFORM_SCALE`, `angle` will be zero.
`matrix`	`SVGMatrix`	The matrix that represents this transformation. The matrix object is live, meaning that any changes made to the `SVGTransform` object are immediately reflected in the matrix object and vice versa. In case the matrix object is changed directly (i.e., without using the methods on the `SVGTransform` interface itself) then the type of the `SVGTransform` changes to `SVG_TRANSFORM_MATRIX`. For `SVG_TRANSFORM_MATRIX`, the matrix contains the a, b, c, d, e, f values supplied by the user. For `SVG_TRANSFORM_TRANSLATE`, e and f represent the translation amounts (a=1, b=0, c=0 and d=1). For `SVG_TRANSFORM_SCALE`, a and d represent the scale amounts (b=0, c=0, e=0 and f=0). For `SVG_TRANSFORM_SKEWX` and `SVG_TRANSFORM_SKEWY`, a, b, c and d represent the matrix which will result in the given skew (e=0 and f=0). For `SVG_TRANSFORM_ROTATE`, a, b, c, d, e and f together represent the matrix which will result in the given rotation. When the rotation is around the center point (0, 0), e and f will be zero.

matrix

SVGMatrix

The matrix that represents this transformation. The matrix object is live, meaning that any changes made to the SVGTransform object are immediately reflected in the matrix object and vice versa. In case the matrix object is changed directly (i.e., without using the methods on the SVGTransform interface itself) then the type of the SVGTransform changes to SVG_TRANSFORM_MATRIX.

For SVG_TRANSFORM_MATRIX, the matrix contains the a, b, c, d, e, f values supplied by the user.
For SVG_TRANSFORM_TRANSLATE, e and f represent the translation amounts (a=1, b=0, c=0 and d=1).
For SVG_TRANSFORM_SCALE, a and d represent the scale amounts (b=0, c=0, e=0 and f=0).
For SVG_TRANSFORM_SKEWX and SVG_TRANSFORM_SKEWY, a, b, c and d represent the matrix which will result in the given skew (e=0 and f=0).
For SVG_TRANSFORM_ROTATE, a, b, c, d, e and f together represent the matrix which will result in the given rotation. When the rotation is around the center point (0, 0), e and f will be zero.

Methods

Name & Arguments	Return	Description
`setMatrix(in SVGMatrix matrix)`	void	Sets the transform type to `SVG_TRANSFORM_MATRIX`, with parameter matrix defining the new transformation. Note that the values from the parameter `matrix` are copied. Exceptions: a `DOMException` with code `NO_MODIFICATION_ALLOWED_ERR` is raised when attempting to modify a read only attribute or when the object itself is read only.
`setTranslate(in float tx , in float ty)`	void	Sets the transform type to `SVG_TRANSFORM_TRANSLATE`, with parameters `tx` and `ty` defining the translation amounts. Exceptions: a `DOMException` with code `NO_MODIFICATION_ALLOWED_ERR` is raised when attempting to modify a read only attribute or when the object itself is read only.
`setScale(in float sx , in float sy)`	void	Sets the transform type to `SVG_TRANSFORM_SCALE`, with parameters `sx` and `sy` defining the scale amounts. Exceptions: a `DOMException` with code `NO_MODIFICATION_ALLOWED_ERR` is raised when attempting to modify a read only attribute or when the object itself is read only.
`setRotate(in float angle, in float cx , in float cy)`	void	Sets the transform type to `SVG_TRANSFORM_ROTATE`, with parameter `angle` defining the rotation angle and parameters `cx` and `cy` defining the optional center of rotation. Exceptions: a `DOMException` with code `NO_MODIFICATION_ALLOWED_ERR` is raised when attempting to modify a read only attribute or when the object itself is read only.
`setSkewX(in float angle)`	void	Sets the transform type to `SVG_TRANSFORM_SKEWX`, with parameter `angle` defining the amount of skew. Exceptions: a `DOMException` with code `NO_MODIFICATION_ALLOWED_ERR` is raised when attempting to modify a read only attribute or when the object itself is read only.
`setSkewY(in float angle)`	void	Sets the transform type to `SVG_TRANSFORM_SKEWY`, with parameter `angle` defining the amount of skew. Exceptions: a `DOMException` with code `NO_MODIFICATION_ALLOWED_ERR` is raised when attempting to modify a read only attribute or when the object itself is read only.