http://soft.vub.ac.be/ajtraining/ 2026-04-23T15:15:24+00:00 http://soft.vub.ac.be/ajtraining/ http://soft.vub.ac.be/ajtraining/_media/wiki:dokuwiki-128.png text/html 2021-02-05T12:51:29+00:00 Anonymous (anonymous@undisclosed.example.com) http://soft.vub.ac.be/ajtraining/caching:ex1?rev=1612529489&do=diff Intro Ex1 Ex2 Ex3 Ex4 Caching: Constant Override Task: Pass tests.BoundsConstant. A first, very crude approximation of the bounding box, would be to return the entire drawing canvas. This is certainly very fast to calculate (it is a constant value), although it might mean excessive redrawing. text/html 2021-02-05T12:51:29+00:00 Anonymous (anonymous@undisclosed.example.com) http://soft.vub.ac.be/ajtraining/caching:ex2?rev=1612529489&do=diff Intro Ex1 Ex2 Ex3 Ex4 Caching: Constant cache Using inter-type declarations Task: Pass tests.BoundsConstantCache. Instead of making the (very) conservative approximation of getBounds() from the previous part, write an aspect instead that remembers the return value from the first time text/html 2021-02-05T12:51:29+00:00 Anonymous (anonymous@undisclosed.example.com) http://soft.vub.ac.be/ajtraining/caching:ex3?rev=1612529489&do=diff Intro Ex1 Ex2 Ex3 Ex4 Caching: Invalidate (part I) Task: Pass tests.Invalidation1. While caching in this way does save computation, it will lead to incorrect bounding boxes if a Group is ever moved. Write another separate aspect that invalidates (i.e. clears) the cache whenever the text/html 2021-02-05T12:51:29+00:00 Anonymous (anonymous@undisclosed.example.com) http://soft.vub.ac.be/ajtraining/caching:ex4?rev=1612529489&do=diff Intro Ex1 Ex2 Ex3 Ex4 Caching: Invalidate (part II) Task: Pass tests.Invalidation2a and pass tests.Invalidation2b. Of course, the previous aspect didn't really solve the problem. What if a Point that is part of a Group moves? Whenever either of the fields of a Point text/html 2021-02-05T12:51:29+00:00 Anonymous (anonymous@undisclosed.example.com) http://soft.vub.ac.be/ajtraining/caching:intro?rev=1612529489&do=diff Intro Ex1 Ex2 Ex3 Ex4 Caching: Intro Figure elements must implement a getBounds method to determine the area that must be redrawn when the figure element is updated. Computation of this bounding box of Group objects needs to deal with all aggregate parts of the group, and this computation can be expensive. In this track, we will explore various ways of reducing this expense.