Pseudo Line Drawing Algorithm.

Derivation and Algorithm of Pseudo Line Drawing Algorithm

DERIVATION :

                  It is the combination of points. Let us assume that we have plot a point of a line.

Y - Y1 = Y2 –Y1/X2 –X1 (X – X1)

Y = Y1 + Y2 –Y1/X2 –X1 (X – X1)

ALGORITHM OF PSEUDO LINE DRAWING :

Begin :

            Read (Xa ,Ya) and (Xb,Yb)

            X = Xa , Y= Ya

            while(X != Xb)

            {

                 plotpoint (X , Y)

                 X =X +1

                 Y = Ya + Yb-Ya/Xb-Xa (X - Xa)

            }

             plotpoint (Xb ,Yb)

End 

DRAWBACK  OF PSEUDO LINE DRAWING : 

•   Round of error.
•    Floating point operation.
•     Stair case output.