A recommended approach for defining a platform-independent custom cursor is to create a PNG image and define a cursor element that references the PNG image and identifies the exact position within the image which is the pointer position i. This is similar to what is known from image editing software when blending two layers. The mode is defined by the mode attribute. It allows operations like brightness adjustment, contrast adjustment, color balance or thresholding. Additionally, a component-wise arithmetic operation with the result clamped between [ A convolution combines pixels in the input image with neighboring pixels to produce a resulting image.
A wide variety of imaging operations can be achieved through convolutions, including blurring, edge detection, sharpening, embossing and beveling. The resulting image, which is an RGBA opaque image, depends on the light color, light position and surface geometry of the input bump map. It's usefulness lies especially in fattening or thinning effects. The input image as a whole is offset by the values specified in the dx and dy attributes.
The resulting image is an RGBA image based on the light color. The lighting calculation follows the standard specular component of the Phong lighting model. The resulting image depends on the light color, light position and surface geometry of the input bump map. The result of the lighting calculation is added. The filter primitive assumes that the viewer is at infinity in the z direction. It allows the synthesis of artificial textures like clouds or marble.
The resulting image will fill the entire filter primitive subregion. It defines a font's outer properties. This process is known as kerning. Metadata is structured information about data. For example, for horizontal text, the calculations must assume that each glyph extends vertically to the full ascent and descent values for the font. Because declarative or scripted animation can change the shape, size, and position of an element, the bounding box is mutable. Thus, the bounding box for an element shall reflect the current values for the element at the snapshot in time at which the bounding box is requested, whether through a script call or as part of a declarative or linking syntax.
Note that elements whose DOM object does not derive from SVGGraphicsElement such as gradient elements do not have a bounding box, and thus have no interface to request a bounding box.
Elements in the rendering tree which reference unresolved resources shall still have a bounding box, defined by the position and dimensions specified in their attributes, or by the initial value for those attributes if no values are supplied. The following algorithm defines how to compute a bounding box for a given element. The inputs to the algorithm are:.
Data transformation (statistics) - Wikipedia
The algorithm to compute the bounding box is as follows, depending on the type of element :. The values of the fill , fill-opacity and fill-rule properties do not affect fill-shape.
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The values of the stroke-opacity , stroke-dasharray and stroke-dashoffset do not affect the calculation of the stroke shape. The fill , stroke and markers input arguments to this algorithm do not affect the bounding box returned for these elements. The object bounding box , stroke bounding box or decorated bounding box of an element is the result of invoking the bounding box computation algorithm above with the following arguments: element is the element itself; space is the element's user coordinate system; fill is true; stroke is true if we are computing the stroke bounding box or decorated bounding box , and false othwerise; markers is true if we are computing the decorated bounding box , and false otherwise; and clipped is false.
The following elements offer the option of expressing coordinate values and lengths as fractions and, in some cases, percentages of the object bounding box , by setting a specified attribute to 'objectBoundingBox' on the given element:. In the discussion that follows, the term applicable element is the element to which the given effect applies. For gradients and patterns, the applicable element is the graphics element which has its fill or stroke property referencing the given gradient or pattern. For special rules concerning text elements , see the discussion of object bounding box units and text elements.
For clipping paths, masks and filters, the applicable element can be either a container element or a graphics element. When keyword objectBoundingBox is used, then the effect is as if a supplemental transformation matrix were inserted into the list of nested transformation matrices to create a new user coordinate system. First, the minx , miny and maxx , maxy coordinates are determined by the extends of the object bounding box of the applicable element.
Then, coordinate 0,0 in the new user coordinate system is mapped to the minx,miny corner of the tight bounding box within the user coordinate system of the applicable element and coordinate 1,1 in the new user coordinate system is mapped to the maxx,maxy corner of the tight bounding box of the applicable element. In most situations, the following transformation matrix produces the correct effect:. When percentages are used with attributes that define the gradient vector, the pattern tile, the filter region or the masking region, a percentage represents the same value as the corresponding decimal value e.
Any numeric value can be specified for values expressed as a fraction or percentage of object bounding box units. Keyword objectBoundingBox should not be used when the geometry of the applicable element has no width or no height, such as the case of a horizontal or vertical line, even when the line has actual thickness when viewed due to having a non-zero stroke width since stroke width is ignored for bounding box calculations.
Transformed & Transforming
When the geometry of the applicable element has no width or height and objectBoundingBox is specified, then the given effect e. The concrete object size must be calculated using the Default Sizing Algorithm defined in CSS Images 3 [ css-images-3 ], with the following inputs:. The intrinsic dimensions must also be determined from the width and height sizing properties.
If either width or height are not specified, the used value is the initial value 'auto'. With bitmap image formats, the intrinsic dimensions are fixed in the image file, and the specified size is defined in the host document as needed to scale the image. SVG, being inherently scalable, adapts the intrinsic width and intrinsic height to be the width and height of the specified size. The intrinsic aspect ratio must be calculated using the following algorithm. If the algorithm returns null, then there is no intrinsic aspect ratio. The behaviour defined in this section is specific to CSS, but may be adapted to other host contexts.
In all host contexts, the intrinsic aspect ratio , where available, must be respected when sizing the SVG viewport. In this example the intrinsic aspect ratio of the SVG viewport is The intrinsic width is 10cm and the intrinsic height is 5cm.
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In this example the intrinsic aspect ratio of the outermost SVG viewport is An aspect ratio calculation in this case allows embedding in an object within a containing block that is only constrained in one direction. Add more examples for the new auto value? Sometimes it is of interest to let the outline of an object keep its original width or to let the position of an object fix no matter which transforms are applied to it. For example, in a map with a 2px wide line representing roads it is of interest to keep the roads 2px wide even when the user zooms into the map, or introductory notes on the graphic chart in which panning is possible.
To offer such effects regarding special coordinate transformations and graphic drawings, SVG Tiny 1. Although SVG Tiny 1. Furthermore, since these effects can be specified in combination, they show more various effects. And, future versions of the SVG language will allow for more powerful vector effects through this property.
Derived forms of transform
Values of vector-effect other than non-scaling-stroke and none are at risk of being dropped from SVG 2 due to a lack of implementations. Feedback from implementers is requested, regarding the practicality of implementing them as currently specified, during the implementation period. These values can be enumerated. Thereby, the effect which has these characteristics simultaneously can be specified. The following two values assists the above-mentioned values.
They show the host coordinate space of constrained transformations. An initial value in case it is not specified is viewport. This section shows the list of transformation formulas regarding combinations of the values for clarification of the behavior of vector effects excluding non-scaling-stroke which has clear implications. The vector-effect property has no effect on transformations performed in a 3d rendering context. The normal coordinate transformation formula from user coordinate system to viewport coordinate system is as follows. When the vector-effect is added to an element like the above, the transformation formula for user coordinate to the device coordinate changes as follows.
Here, x f and y f are user coordinate of the corresponding element and its descendant. And, x o and y o are matrix element e and f of the transform attribute which the corresponding element has. When this value becomes 0 and non-scaling-size is appointed, vector-effect becomes invalidity namely none. Below is normal coordinate transformation formula for nested viewport coordinate systems without vector effects.
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CTM this is CTM for the transformation matrix from user coordinate system of an target graphic to viewport coordinate system to which it belongs. CTM parent is CTM for the transformation matrix from aforementioned viewport coordinate system to viewport coordinate system of the parent of that. When applying seven formulas of the preceding section to nested viewport coordinate systems, the application way of those formulas changes as follows by whether viewport or screen is specified as the additional value of vector-effect. When viewport value is specified, user agent computes coordinates combining either of seven formulas of the preceding chapter, and the following formulas.
When screen value is specified, user agent computes coordinates combining either of seven formulas of the preceding chapter, and the following formulas. Below is an example of the non-scaling-stroke vector-effect. Below is an example of the none vector-effect no vector effect. Below is an example of the non-scaling-size non-rotation.
Below is an example of the non-scaling-size fixed-position.
Below is an example of the non-rotation fixed-position. Below is an example of the non-scaling-size non-rotation fixed-position. An SVGTransform represents a single component in a transform list, such as a single scale … or matrix … value. An SVGTransform object can be designated as read only , which means that attempts to modify the object will result in an exception being thrown, as described below.
An SVGTransform object can be associated with a particular element. Unless otherwise described, an SVGTransform object is not associated with any element.
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