Difference between revisions of "Diagrams/Dev/Migrate1.2"
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== Images ==
== Images ==
== Reorganization ==
== Reorganization ==
Revision as of 16:21, 3 June 2014
This page describes breaking API changes between diagrams 1.1 and 1.2, along with explanations of how to migrate to the new 1.2 API.
Attributes using Measure
Many distances are now specified using values of type
Measure. See the user manual for full details. The most noticeable effects of this change in porting diagrams code to 1.2 will be type errors on uses of attribute functions like
- To simply retain the existing behavior, replace
- In many cases, you can simply remove calls to
lw, since the default behavior is much more sensible. You can also use the named line weights provided in
ultraThick. For example, replace
lw none, and replace (say)
lw veryThick(though note that the relationship between the number used previously and the proper choice of line weight depends on the context, because the old semantics was not very sensible).
freeze function has been removed. Most users probably were not using it; if you were, you have several options for replacing it, depending on how you were using it:
- If you were just using it to get some lines to scale along with a diagram, use a
Localline width (e.g.
... # lw (Local 2)or
... # lwL 2).
- The above will not work if you were doing non-uniform scaling and really care that the lines should come out looking squished and stretched. In that case, use functions in
Diagrams.TwoD.Offsetto create a path corresponding to the stroked line, and then fill and transform it normally.
The size of arrow heads and tails is now specified in terms of length instead of the radius of their circumcircle. In addition, the lengths are specified using
Measure. For convenience, aliases
huge have been provided. For example,
... & headSize .~ 0.7
might be replaced with
... & headLength .~ large
Gaps at the ends of arrows are also specified using
Measure R2. Also, the
gap traversal has been replaced by
gaps for consistency in naming, though
gap is still provided for backwards compatibility. For example, replace
... & gap .~ 1
... & gaps .~ Local 1
If you were using the cairo backend to include PNG images in your diagrams then you will need to make some small changes to your code using the new Image API. Diagrams now distinguishes between external and embedded images, cairo (as it has done in previous versions) only supports external images. For example if you were creating a diagram from a PNG called "myImage.png" using
image "~/myImage.png" 1 1
then you can replace it with
image (uncheckedImageRef "~/myImage.png" 1 1)
and get exactly the same behavior as with 1.1. Additionally, you can now create a "checked" external image with the function
loadImageExt which will utilize the Juicy Pixels library to make sure the image exists and calculate its dimension so you don't need to provide a width and height. See the user manual for full details
These changes will not affect most users, but are listed here for completeness.
avgScalefunction has been moved from
- Most 2D attributes have been moved from
Angledefinition and related functions have moved to a separate module,