RML curves use the two endpoints or "anchor points" and two "nodes". In RML, if you give a curve 4 control points which we shall call x1,y1 , x2,y2 , x3,y3 , and x4, y4 , the start point of the curve will be specified by x1,y1 and the endpoint specified by x4,y4. The line segment from x1,y1 to x2,y2 forms a tangent to the curve. The line segment from x3,y3 to x4,y4 also forms a tangent to the curve. This allows you to make complex figures.
You may specify attribute autoclose to be one of the values: none , pdf or svg ; these values alter how automatic closing of sub-paths is handled. The default none just leaves the renderer to handle filling as does pdf , but in the latter case all-subpaths are forced to be closed if fill is set. The last value svg fills and strokes separately stroke last.
Finally you can control how filling of complex shapes is handled by specifying attribute fillrule to be one of the values: none , even-odd or non-zero. The default none means let the pdf canvas decide, but that is currently equivalent to even-odd. For further information on fill rules consult a graphics primer. Between these two tags, you can have a number of things:. But the story is empty, and we haven't used the stylesheet at all. It produces a grid of lines.
It takes two arguments - xs which is a list of x co-ordinates separated by commas , and ys which is a comma-separated list of y co-ordinates.
In a graphic operation i. Both can be given in any unit that RML understands. They are optional to allow you to only give one of the pair - so moving the origin in only one direction. The scale tag takes two optional attributes: sx and sy. The scaling does not have to be proportional - omitting one allows you to change the scaling in one direction only. And you can shrink the shape as well as scale it up - an sx or sy of "2" doubles the size of it, but an sx or sy of "0.
