RMagick 1.15.0: RVG Reference: Styles

Description

Assigns styles to the target object, which may be a container, shape, text, raster image, or pattern. Styles are presentational attributes that define how the object is rendered.

Styles yields to a block if a block is present, passing the target object as an argument. This is useful when styles is chained to a container constructor method such as g or rvg. By default, objects within a container get the styles defined on the container.

Styles returns the target object, so other methods can be chained to it.

Arguments

The argument is a hash. The hash keys are style name symbols. The hash values are the style values. RVG supports the following style names.

:clip_path

An outline used to clip a shape or collection of shapes. The value is an clipping path.

:clip_rule

If the clip_path style is used, how to determine if a point is inside or outside a the clip path. The value is a string, either 'nonzero' or 'evenodd'. The default is 'nonzero'. See the fill_rule example below.

:fill

The fill color. The value must be a color name or a pattern. The default is 'black'.

:fill_opacity

The opacity of the fill color. A number between 0.0 (fully transparent) and 1.0 (fully opaque). The default is 1.0

:fill_rule

How to determine if a point is inside or outside a shape. The value is a string, either 'nonzero' or 'evenodd'. The default is 'nonzero'.

The following descriptions of 'nonzero' and 'evenodd' are from the SVG 1.1 standard.

nonzero: This rule determines the "insideness" of a point on the canvas by drawing a ray from that point to infinity in any direction and then examining the places where a segment of the shape crosses the ray. Starting with a count of zero, add one each time a path segment crosses the ray from left to right and subtract one each time a path segment crosses the ray from right to left. After counting the crossings, if the result is zero then the point is outside the path. Otherwise, it is inside.
evenodd: This rule determines the "insideness" of a point on the canvas by drawing a ray from that point to infinity in any direction and counting the number of path segments from the given shape that the ray crosses. If this number is odd, the point is inside; if even, the point is outside.

See the examples below.

:opacity

Both the stroke and the fill opacity. A number between 0.0 (fully transparent) and 1.0 (fully opaque). The default is 1.0. See below for an example.

:stroke

The stroke color. The value must be a color name or a pattern. The default is 'none', that is, transparent black ("#000000ff").

:stroke_dasharray

An array of numbers that specify the length of the dashes and gaps with which to draw a dashed line. If the array contains an odd number of values, the values are repeated to produce an even number of dashes and gaps. The numbers are in user coordinates. By default all lines are drawn as solid lines. See below for an example.

:stroke_dashoffset

Normally a dashed line is drawn using the first number in the stroke_dasharray as the length of the first dash. This style can be used to specify a different starting point in the array.

:stroke_linecap

The shape of the end of a line. The value may be one of the strings 'butt', 'round', or 'square'. The default is 'butt'. See below for an example.

:stroke_linejoin

The shape of the corner where two lines are joined. The value may be one of the strings 'miter', 'round', or 'bevel'. The default is 'miter'. See below for an example.

:stroke_miterlimit

If the stroke_linejoin value is 'miter', a number specifying the ratio of the miter to the thickness of the lines being joined. When the limit is exceeded the join is converted from a miter to a bevel. The value must be a number greater than or equal to 1.0. The default is 4.0.

:stroke_opacity

The opacity of the stroke color. A number between 0.0 (fully transparent) and 1.0 (fully opaque). The default is 1.0 unless stroke has the default value 'none'.

:stroke_width