It's taken from Computer-Graphics, SagarGaniga GitHub

1. calculate dx , dy

2. dx = X1 - X0; dy = Y1 - Y0;

3. Depending upon absolute value of dx & dy choose number of steps to put pixel as steps = abs(dx) > abs(dy) ? abs(dx) : abs(dy)

4. calculate increment in x & y for each steps

5. Xinc = dx / (float) steps; Yinc = dy / (float) steps;

6. Put pixel for each step X = X0; Y = Y0;

   for (int i = 0; i <= steps; i++) {

   putpixel (X,Y,WHITE);
   
   X += Xinc;
   
   Y += Yinc;
   

   }