Fixed an error with getting pixel values on line algorithm
Fixed an error with getting pixel values on line algorithm

stscieisenhamer/ginga,rupak0577/ginga,ejeschke/ginga,naojsoft/ginga,Cadair/ginga,pllim/ginga,ejeschke/ginga,pllim/ginga,Cadair/ginga,rupak0577/ginga,naojsoft/ginga,ejeschke/ginga,rupak0577/ginga,stscieisenhamer/ginga,naojsoft/ginga,pllim/ginga,stscieisenhamer/ginga,Cadair/ginga