boogiewoogie / Blog: Recent posts

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Computational Geometry : Detecting Whether Two AABB Boxes Overlap

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from : http://gamemath.com/2011/09/detecting-whether-two-boxes-overlap/

The acronym AABB is often used for axially-aligned bounding box.
¿axially-aligned¿ means that the sides are parallel to the x- and y-axes;

With very high frequency one answers with the incorrect solution discussed below, work through some examples, and arrive at the correct one. ... read more

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Computational Geometry : 2D Afine Transformation matrixes

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Ref:

http://en.wikipedia.org/wiki/Transformation_matrix

• Affine transformations preserve collinearity and relative distancing :
  • points on a line will remain in a line after an affine transformation
  • parallel lines remain parallel
  • relative spacing or distancing,
    (may scale, but will always maintain at a consistent ratio.)
• Affine transformations allow for repositioning, scaling, skewing and rotation.
• Things they cannot do include tapering or distorting with perspective.
• Toutes les transformations affines peuvent se calculer avec des matrices.... read more

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Looking at Casey Duncan's 'Planar' lib

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Looking at Casey Duncan's 'Grease' code

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Ref :

http://pythonhosted.org/grease/index.html

Time tracking

[docs] def tick(self, dt):
"""Tick the mode's clock, but only if the world is currently running

    :param dt: The time delta since the last tick
    :type dt: float
    """
    if self.running:
        super(World, self).tick(dt)
... [read more](/p/boogiewoogie/blog/2013/05/looking-at-casey-duncans-grease-code/)

History of revisions

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• r09

  • module palette --> couleurs et listes de couleurs
  • module grob
    • reorganisation de la fonction move au niveau sup
    • ajout de types de mvt differents
  • module pygloop :
  • module flatmath :

• r08

  • module pygloop --> classe canvas
  • module grob --> primitives geometriques
  • module flatmath --> math tools... read more

Notes:

Regler le pb d'update des AABB pour les objets après leur transformation
Among their many advantages, managed attributes are used
- to protect an attribute from changes or
- to automatically update the values of a dependant attribute.

Logiques possibles en animation.
- comportements individuels
--> gérer les collisions ou non
--> orientation 'jeu video' et 'automates'
- gérer des scenarios en fonction du temps écoulé
--> implémenter une variable temps total
--> voir grease: world est une variable globale
- solution mixte : semi-autonomie + events scénarisés... read more