Parametric Line Drawing Algorithm.

Derivation and Algorithm of Parametric Line Drawing Algorithm.

DERIVATION :

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

X  - Xa/ cos(angle) = Y – Ya / sin(angle) = r

X = Xa + r cos(angle)

Y = Ya + r sin(angle)

ALGORITHM OF PARAMETRIC LINE DRAWING :

Begin :

            Read (Xa ,Ya) and (Xb,Yb)

            X = Xa , Y= Ya

            while(X != Xb)

            {

                 plotpoint (X , Y)

                 X = Xa + r cos(angle) 

           Y = Ya + r sin(angle)

            }

             plotpoint (Xb ,Yb)

End 

DRAWBACK OF PARAMETRIC LINE DRAWING :

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