A viewport contains points, not coordinates
A viewport contains points, not coordinates

Make the methods accept ICoordinates instances.

ThibaultR/cgeo,madankb/cgeo,KublaikhanGeek/cgeo,rsudev/c-geo-opensource,schwabe/cgeo,schwabe/cgeo,matej116/cgeo,cgeo/cgeo,tobiasge/cgeo,matej116/cgeo,mucek4/cgeo,KublaikhanGeek/cgeo,matej116/cgeo,mucek4/cgeo,samueltardieu/cgeo,yummy222/cgeo,schwabe/cgeo,yummy222/cgeo,cgeo/cgeo,KublaikhanGeek/cgeo,brok85/cgeo,brok85/cgeo,auricgoldfinger/cgeo,xiaoyanit/cgeo,vishwakulkarni/cgeo,xiaoyanit/cgeo,cgeo/cgeo,brok85/cgeo,cgeo/cgeo,pstorch/cgeo,SammysHP/cgeo,madankb/cgeo,tobiasge/cgeo,ThibaultR/cgeo,auricgoldfinger/cgeo,S-Bartfast/cgeo,rsudev/c-geo-opensource,Bananeweizen/cgeo,S-Bartfast/cgeo,vishwakulkarni/cgeo,marco-dev/c-geo-opensource,Huertix/cgeo,samueltardieu/cgeo,rsudev/c-geo-opensource,vishwakulkarni/cgeo,kumy/cgeo,pstorch/cgeo,tobiasge/cgeo,pstorch/cgeo,ThibaultR/cgeo,lewurm/cgeo,kumy/cgeo,Huertix/cgeo,Bananeweizen/cgeo,lewurm/cgeo,marco-dev/c-geo-opensource,yummy222/cgeo,SammysHP/cgeo,marco-dev/c-geo-opensource,lewurm/cgeo,madankb/cgeo,xiaoyanit/cgeo,Bananeweizen/cgeo,S-Bartfast/cgeo,superspindel/cgeo,samueltardieu/cgeo,Huertix/cgeo,auricgoldfinger/cgeo,SammysHP/cgeo,schwabe/cgeo,kumy/cgeo,superspindel/cgeo,superspindel/cgeo,mucek4/cgeo