Dda_-line algorithm for differential plotting

Dda_-line algorithm for differential plotting

In step axis = 1 pixels, calculate y=kx + B and draw pixel points (x, round (y)).

That is, the step coordinates increase by 1, and the other coordinates grow K or 1/k.

The procedure is as follows:

1 //numerical differential algorithm dda2 voidCcgprojectworkview::D da_line (Const intStartpos[],Const intEndpos[],Const floatlinecolor[])3 {4 Glpushmatrix ();5     //Draw a line6     LongDeltx, Delty, Maxstep;7Deltx = endpos[0]-startpos[0];8Delty = endpos[1]-startpos[1];9Maxstep =Max (ABS (DELTX), ABS (delty));Ten     //calculates the direction of the step unit, that is, the slope growth Unit in two directions One     floatXstepunion =float(DELTX)/Maxstep; A     floatYstepunion =float(delty)/Maxstep; -  -glcolor3f (linecolor[0], linecolor[1], linecolor[2]); the Glbegin (gl_points); -  -     floatx, y;//plotted coordinate points -x = (float) startpos[0]; +y = (float) startpos[1]; -  +     //cyclic stepping in two directions A      for(LongI=1; i<=maxstep; i++)   at     {   -x = x +xstepunion;  -y = y +ystepunion; -glvertex3f ((int) x, (int) Y,0); -     }   - glend (); in Glpopmatrix (); -}

Dda_-line algorithm for differential plotting