Construction
Imported Graphics

Const. Line Finite
is a reference/construction line with a start point and end point that describe the dimension of the construction line.
Const. Line Inf.
Is a reference/construction line that has infinite boundaries and is input using point to point clicks.
Const. Line Inf. Line Snap
Is a reference/construction line that has infinite boundaries and is input using snap as an input mechanism. (This means the user can click on a wall and it will be inputted automatically)
Construction Point
Is a refence/construction point that allows the user to pick snap location as original point and also can use up-left-down-right keys to where the user wants to place new origin