picture rSAVEPICT; def Repere(expr l,h,ox,oy,ux,uy) = def gENPLACE = xscaled ux yscaled uy shifted (ox,oy) scaled gU enddef; rLARGEUR := l; rHAUTEUR := h; rXMIN := - ox / ux; rXMAX := rXMIN + l / ux; rYMIN := - oy / uy; rYMAX := rYMIN + h / uy; rUX := ux; rUY := uy; enddef; def Debut = rSAVEPICT := currentpicture; currentpicture := nullpicture; enddef; def Fin = clip currentpicture to ( (0,0)--(rLARGEUR,0)--(rLARGEUR,rHAUTEUR)--(0,rHAUTEUR)--cycle) scaled gU; addto rSAVEPICT also currentpicture; currentpicture := rSAVEPICT; def gENPLACE = scaled gU enddef; enddef; def Axes = drawarrow ((rXMIN,0)--(rXMAX,0)) gENPLACE; drawarrow ((0,rYMIN)--(0,rYMAX)) gENPLACE; label.lrt(TEX("$x$"),(rXMAX,0) gENPLACE); label.ulft(TEX("$y$"),(0,rYMAX) gENPLACE); enddef; vardef Graduations = save xmin, xmax, ymin, ymax; xmin = floor(rXMIN); xmax = floor(rXMAX) + 1; ymin = floor(rYMIN); ymax = floor(rYMAX) + 1; SequenceTirets((xmin,0),(1,0),(0,-4),xmax-xmin+1); SequenceTirets((xmin+0.5,0),(1,0),(0,-2),xmax-xmin); SequenceTirets((0,ymin),(0,1),(-4,0),ymax-ymin+1); SequenceTirets((0,ymin+0.5),(0,1),(-2,0),ymax-ymin); enddef; % % SequenceTirets % ------------------------------------------------------------------------------ vardef SequenceTirets(expr o,p,t,n) text a= save ot; pair ot; ot := o gENPLACE; for i:=1 upto n: % tiret draw ot -- (ot shifted t) a; % avancement ot := (o + i*p) gENPLACE; endfor enddef; vardef Unites(expr t) = if t=1: label.bot(TEX("$+1$"),(1,-(3/gU/rUY)) gENPLACE); label.ulft(TEX("$+1$"),(-(3/gU/rUX),1) gENPLACE); fi enddef; endinput