Module: GTransMat

Defined in:
lib/transformations.rb

Class Method Summary collapse

Class Method Details

.gCenterAtMatrix(tranmatrix, about) ⇒ Object 



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# File 'lib/transformations.rb', line 23

def self.gCenterAtMatrix(tranmatrix,about)
    t = GTransMat.gTranslateMatrix(-about.x , -about.y)
    return t.inv * (tranmatrix * t)
end

.gRotateMatrix(radian) ⇒ Object 



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# File 'lib/transformations.rb', line 5

def self.gRotateMatrix(radian)
  return Matrix[[Math.cos(radian) , Math.sin(radian),0],
                [-Math.sin(radian) , Math.cos(radian),0],
                [0,0,1]]
end

.gScaleMatrix(sx, sy) ⇒ Object 



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# File 'lib/transformations.rb', line 17

def self.gScaleMatrix(sx,sy)
  return Matrix[[sx , 0 ,0],
                [0 , sy ,0],
                [0 , 0 ,1]]
end

.gTranslateMatrix(dx, dy) ⇒ Object 



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# File 'lib/transformations.rb', line 11

def self.gTranslateMatrix(dx,dy)
  return Matrix[[1 , 0 ,dx],
                [0 , 1 ,dy],
                [0 , 0 ,1]]
end