transform->initialise

Documentation
- Reference manual
- Packages
  - XPCE
    - Classes
      - class transform
        
        Send methods
        
        transform->initialise
        
        transform->set
        
        transform->copy
        
        transform->identity
        
        transform->translate
        
        transform->scale
        
        transform->rotate
        
        transform->shear
        
        transform->compose
        
        transform->invert

transform ->initialise: rotate=[num], scale=[num|tuple], shear=[tuple]

Build from optional rotate (degrees), scale (uniform num or tuple(sx, sy)) and shear (tuple(kx, ky)). The fresh transform starts at identity; the supplied operations are applied in the fixed order scale, rotate, shear. Following the post-multiplication convention this means an input point is transformed shear-first, then rotated, then scaled.

For an arbitrary transform whose six coefficients are known, use

new(T, transform), send(T, set, XX, XY, YX, YY, TX, TY)