A Texture is either a color SC, linear gradient LG, or radial gradient RG. An object can have only one texture which is determined by the Last semigroup structure.

Convert a solid colour into a texture.

Prism onto an AlphaColour Double of a SC texture.

A default is provided so that linear gradients can easily be created using lenses. For example, lg = defaultLG & lGradStart .~ (0.25 ^& 0.33). Note that no default value is provided for lGradStops, this must be set before the gradient value is used, otherwise the object will appear transparent.

A default is provided so that radial gradients can easily be created using lenses. For example, rg = defaultRG & rGradRadius1 .~ 0.25. Note that no default value is provided for rGradStops, this must be set before the gradient value is used, otherwise the object will appear transparent.

A gradient stop contains a color and fraction (usually between 0 and 1)

A color for the stop.

The fraction for stop.

A convenient function for making gradient stops from a list of triples. (An opaque color, a stop fraction, an opacity).

The SpreadMethod determines what happens before lGradStart and after lGradEnd. GradPad fills the space before the start of the gradient with the color of the first stop and the color after end of the gradient with the color of the last stop. GradRepeat restarts the gradient and GradReflect restarts the gradient with the stops in reverse order.

Apply a linear gradient.

Apply a radial gradient.

Linear Gradient

A list of stops (colors and fractions).

A transformation to be applied to the gradient. Usually this field will start as the identity transform and capture the transforms that are applied to the gradient.

The starting point for the first gradient stop. The coordinates are in local units and the default is (-0.5, 0).

The ending point for the last gradient stop.The coordinates are in local units and the default is (0.5, 0).

For setting the spread method.

Make a linear gradient texture from a stop list, start point, end point, and SpreadMethod. The lGradTrans field is set to the identity transfrom, to change it use the lGradTrans lens.

Radial Gradient

A list of stops (colors and fractions).

A transformation to be applied to the gradient. Usually this field will start as the identity transform and capture the transforms that are applied to the gradient.

The center point of the inner circle.

The radius of the inner cirlce in local coordinates.

The center of the outer circle.

The radius of the outer circle in local coordinates.

For setting the spread method.

Make a radial gradient texture from a stop list, radius, start point, end point, and SpreadMethod. The rGradTrans field is set to the identity transfrom, to change it use the rGradTrans lens.

The texture with which lines are drawn. Note that child textures always override parent textures. More precisely, the semigroup structure on line texture attributes is that of Last.

Set the line (stroke) color. This function is polymorphic in the color type (so it can be used with either Colour or AlphaColour), but this can sometimes create problems for type inference, so the lc and lcA variants are provided with more concrete types.

A synonym for lineColor, specialized to Colour Double (i.e. opaque colors). See comment in lineColor about backends.

A synonym for lineColor, specialized to AlphaColour Double (i.e. colors with transparency). See comment in lineColor about backends.

The texture with which objects are filled. The semigroup structure on fill texture attributes is that of 'Recommed . Last'.

Commit a fill texture in a style. This is not a valid setter because it doesn't abide the functor law (see committed).

Lens onto the Recommend of a fill texture in a style.

Set the fill color. This function is polymorphic in the color type (so it can be used with either Colour or AlphaColour), but this can sometimes create problems for type inference, so the fc and fcA variants are provided with more concrete types.

A synonym for fillColor, specialized to Colour Double (i.e. opaque colors). See comment after fillColor about backends.

A synonym for fillColor, specialized to AlphaColour Double (i.e. colors with transparency). See comment after fillColor about backends.

Set a "recommended" fill color, to be used only if no explicit calls to fillColor (or fc, or fcA) are used. See comment after fillColor about backends.

Push fill attributes down until they are at the root of subtrees containing only loops. This makes life much easier for backends, which typically have a semantics where fill attributes are applied to linesnon-closed paths as well as loopsclosed paths, whereas in the semantics of diagrams, fill attributes only apply to loops.