Fixed constructor so that we don't call calculateScaleAndOffset() over and over, with the values used only being valid in the last call - this avoids reports of the use of uninitialised variables from valgrind.
Fixed constructor so that we don't call calculateScaleAndOffset() over and over, with
the values used only being valid in the last call - this avoids reports of the use
of uninitialised variables from valgrind.

ruschelp/cortex-vfx,code-google-com/cortex-vfx,code-google-com/cortex-vfx,code-google-com/cortex-vfx,code-google-com/cortex-vfx,ruschelp/cortex-vfx,ruschelp/cortex-vfx