Translate matrix

translate.swift

// Our for loop inside of the wheel() function
for (index, unit) in enumerate(self.units) {
    var vector = self.formation!.getVectorAtPosition(index)
    
    // Translate unit to new point. Basically, subtract rotation center offset from units position
    vector = CGVectorMake(vector.dx - self.translateX, vector.dy - self.translateY)
    
    // Rotate the matrix at units position
    var newX  = vector.dx * cosRadian - vector.dy * sinRadian
    var newY = vector.dx * sinRadian + vector.dy * cosRadian
    
    // Translate the center back to the original units center
    unit.moveToPoint(CGPoint(x:newX + self.translateX, y:newY + self.translateY), {})
}