Affine transforms - matrix algebra

Martin Desruisseaux martin.desruisseaux at
Thu Jul 12 04:46:55 PDT 2012

Le 12/07/12 13:40, Martin Desruisseaux a écrit :
> Yes, I think those methods would be useful. Would it be worth to make 
> a special case in the getter method like below?
> if (row == 3) {
>     return (column == 3) ? 1 : 0;
> }
> The setter method would throw an exception on attempt to write a 
> different value in that row (i.e., the last matrix row would be a 
> virtual read-only row). The intend is to simulate a complete 4x4 
> matrix, which can make mathematical operations more natural, 
> especially when working on arbitrary row/column indices unknown at 
> compile time.

Actually such getter method could be placed in the parent Transform 
class, since every subclasses can return appropriate hard-coded values 
for any (row,column) indices not associated to one of their fields 
(omitting the [0 ... 3] range check in this discussion for simplicity). 
This would allow the users to perform their own matrix calculation on 
every kind of Transform object.


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