File "vector"

This file provides means the generate and interact with scalable vector graphics. The output predicates require a markup writer as found in library(misc/markup), either explicit as a parameter or implicit as current output. The SVG output area will have 500x400 SVG coordinate dimension and a twelfth of it in relative font size as browser dimension.

The following vector predicates are provided:

svg_begin(L):
svg_begin(S, L):
The predicate succeeds. As a side effect a new SVG output area with options in L. The binary predicate allows specifying a markup writer S. The following begin options are recognized

height(H): The relative height H in percent, default is 100.
width(W): The relative width W in percent, default is 100.
style(S): The style sheet S to include, default is ''.
    
svg_end:
svg_end(S):
The predicate succeeds. As a side effect the SVG output area is closed. The unary predicate allows specifying a markup writer S.
svg_group_begin(X, Y, A):
 svg_group_begin(S, X, Y, A):
The predicate succeeds. As a side effect a SVG group with translation X,Y and rotation A is created. The quaternary predicate allows specifying a markup writer S.
svg_group_end:
 svg_group_end(S):
The predicate succeeds. As a side effect the SVG group is closed. The unary predicate allows specifying a markup writer S.
svg_rect(X, Y, W, H, L):
svg_rect(S, X, Y, W, H, L):
The predicate succeeds. As a side effect a rectangle element at (X,Y) with dimension (W,H) and style L is added to the SVG output area. The septenary predicate allows specifying a DOM writer. The following style options are supported:

class(C): Use the classes C for the element.
style(S): Use the style S for the element.

svg_line(X1, Y1, X2, Y2, L):
svg_line(S, X1, Y1, X2, Y2, L):
The predicate succeeds. As a side effect a line element from (X1,Y1) to (X2,Y2) with style L is added to the SVG output area. The septenary predicate allows specifying a markup writer S.
svg_text(X, Y, T, L):
svg_text(S, X, Y, T, L):
The predicate succeeds. As a side effect a text element at (X,Y) with content T and style L is added to the SVG output area. The pentamery predicate allows specifying a markup writer S.
svg_circle(X, Y, R, L):
svg_circle(S, X, Y, R, L):
The predicate succeeds. As a side effect a circle element (X,Y) with radius R and style L is added to the SVG output area. The pentamery predicate allows specifying a markup writer S.
svg_path(P, L):
svg_path(S, P, L):
The predicate succeeds. As a side effect a path element with shape P and style L is added to the SVG output area. The ternary predicate allows specifying a markup writer S.
svg_image(X, Y, W, H, U):
svg_image(S, X, Y, W, H, U):
The predicate succeeds. As a side effect an image element at (X,Y) with width W, height H and image URL U s added to the SVG output area. The sixternary predicate allows specifying a markup writer S.
svg_view_inverse(E, I):
The predicate succeeds in I with the inverse transform of the element E.
svg_apply_transform(I, CX, CY, SX, SY):
The predicate succeeds in the viewport coordinates (SX,SY) with the inverse transform I applied to the client coordinates (CX,CY).

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