All of the apologies.

[ipdf/documents.git] / DavidSeminarAbstract

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+Precision in vector documents: a spatial approach
+
+Despite being scalable, vector images are typically specified and manipulated
+with fixed-precision numbers. Existing formats therefore are unable to store
+documents which need greater precision, and existing viewers perform coordinate
+system transforms at a fixed precision, limiting the amount any document may be
+"zoomed".
+
+Using existing arbitrary-precision numeric types can resolve these issues, but
+often at a significant or infeasible performance penalty. By taking into
+account the spatial nature of the data, we can store and view documents to an
+arbitrary precision with little-to-no performance impact. This is achieved by
+clipping the document's constituent Bézier paths to nodes in a quadtree.
+
+We'll discuss the artefacts caused by low-precision, the theory and
+implementation of our quadtree-based format and some remaining issues and future
+possibilities with the technique.