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How to fade a semiplane defined by line?


How can I stop defined points that are not displayed from influencing image size?LaTeX complains that tkzDrawArc is not definedHow to draw a dashed line and length with tkz-euclideColor fade a line in tikzpictureHow may I extend (prolong or produce) a line segment accurately in the following geometrical figure?Drawing rectilinear curves in Tikz, aka an Etch-a-Sketch drawingDraw Perpendicular to a lineHow to fade the color of an angle?Fade draw and fill in TikZHow to use points defined in tkz-euclide in tikz?













7















With the following code:



documentclass[tikz]standalone

usepackagetkz-euclide,tkz-fct,amsmath
usetkzobjall


begindocument
begintikzpicture[anchor=center]
tkzInit[xmin=-1, xmax=3, ymin=-1,ymax=3]
tkzDefPoints.5/2/P_1, 2.5/0/P_2, 1.5/1/M,2/1.5/A

tkzDrawX[noticks, label=(operatornameRe(x) )]
tkzDrawY[noticks, label=(operatornameIm(x) )]

tkzDrawPoints[fill=black, size=1mm](P_1,P_2,M)
tkzMarkRightAngle(A,M,P_1)
tkzFct[domain=-1:3, color=red, thick]x-.5
draw (P_1) -- (P_2);
tkzLabelPoints[above right](P_1,P_2)
tkzLabelPoints[right](M)

tkzText[color=black](1.5,3) )
endtikzpicture
enddocument


I'm getting:



enter image description here



I wanted to add a fade like this:



enter image description here



but I can't have the fade to be in the right angle.



How can I get this kind of fade, fadding to white?










share|improve this question


























    7















    With the following code:



    documentclass[tikz]standalone

    usepackagetkz-euclide,tkz-fct,amsmath
    usetkzobjall


    begindocument
    begintikzpicture[anchor=center]
    tkzInit[xmin=-1, xmax=3, ymin=-1,ymax=3]
    tkzDefPoints.5/2/P_1, 2.5/0/P_2, 1.5/1/M,2/1.5/A

    tkzDrawX[noticks, label=(operatornameRe(x) )]
    tkzDrawY[noticks, label=(operatornameIm(x) )]

    tkzDrawPoints[fill=black, size=1mm](P_1,P_2,M)
    tkzMarkRightAngle(A,M,P_1)
    tkzFct[domain=-1:3, color=red, thick]x-.5
    draw (P_1) -- (P_2);
    tkzLabelPoints[above right](P_1,P_2)
    tkzLabelPoints[right](M)

    tkzText[color=black](1.5,3) )
    endtikzpicture
    enddocument


    I'm getting:



    enter image description here



    I wanted to add a fade like this:



    enter image description here



    but I can't have the fade to be in the right angle.



    How can I get this kind of fade, fadding to white?










    share|improve this question
























      7












      7








      7








      With the following code:



      documentclass[tikz]standalone

      usepackagetkz-euclide,tkz-fct,amsmath
      usetkzobjall


      begindocument
      begintikzpicture[anchor=center]
      tkzInit[xmin=-1, xmax=3, ymin=-1,ymax=3]
      tkzDefPoints.5/2/P_1, 2.5/0/P_2, 1.5/1/M,2/1.5/A

      tkzDrawX[noticks, label=(operatornameRe(x) )]
      tkzDrawY[noticks, label=(operatornameIm(x) )]

      tkzDrawPoints[fill=black, size=1mm](P_1,P_2,M)
      tkzMarkRightAngle(A,M,P_1)
      tkzFct[domain=-1:3, color=red, thick]x-.5
      draw (P_1) -- (P_2);
      tkzLabelPoints[above right](P_1,P_2)
      tkzLabelPoints[right](M)

      tkzText[color=black](1.5,3) )
      endtikzpicture
      enddocument


      I'm getting:



      enter image description here



      I wanted to add a fade like this:



      enter image description here



      but I can't have the fade to be in the right angle.



      How can I get this kind of fade, fadding to white?










      share|improve this question














      With the following code:



      documentclass[tikz]standalone

      usepackagetkz-euclide,tkz-fct,amsmath
      usetkzobjall


      begindocument
      begintikzpicture[anchor=center]
      tkzInit[xmin=-1, xmax=3, ymin=-1,ymax=3]
      tkzDefPoints.5/2/P_1, 2.5/0/P_2, 1.5/1/M,2/1.5/A

      tkzDrawX[noticks, label=(operatornameRe(x) )]
      tkzDrawY[noticks, label=(operatornameIm(x) )]

      tkzDrawPoints[fill=black, size=1mm](P_1,P_2,M)
      tkzMarkRightAngle(A,M,P_1)
      tkzFct[domain=-1:3, color=red, thick]x-.5
      draw (P_1) -- (P_2);
      tkzLabelPoints[above right](P_1,P_2)
      tkzLabelPoints[right](M)

      tkzText[color=black](1.5,3) )
      endtikzpicture
      enddocument


      I'm getting:



      enter image description here



      I wanted to add a fade like this:



      enter image description here



      but I can't have the fade to be in the right angle.



      How can I get this kind of fade, fadding to white?







      tikz-pgf tkz-euclide






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked yesterday









      Concept7Concept7

      1116




      1116




















          3 Answers
          3






          active

          oldest

          votes


















          4














          This is a tkz-euclid solution.



          documentclass[tikz]standalone
          usepackagetkz-euclide,amsmath
          usetkzobjall

          begindocument
          begintikzpicture
          % set working area
          tkzInit[xmin=-1, xmax=3, ymin=-1, ymax=3]
          clip (-1.5,-1.5) rectangle (4,4); % more precise than tkzClip[space=1]
          % define points
          tkzDefPoints.5/2/P_1, 2.5/0/P_2
          tkzDefMidPoint(P_1,P_2)tkzGetPointM
          tkzDefLine[mediator](P_1,P_2)tkzGetPointsA1A2
          tkzDefPointWith[orthogonal,K=-1](A1,M)tkzGetPointA4
          tkzDefPointWith[orthogonal,K=1](A2,M)tkzGetPointA3
          % shade half plane
          tkzFillPolygon[draw=white,top color=white,bottom color=red,middle color=white,shading angle=45](A1,A2,A3,A4)
          tkzDrawSegment[red](A1,A2)
          % draw axes
          tkzDrawX[noticks, label=(operatornameRe(x))]
          tkzDrawY[noticks, label=(operatornameIm(x))]
          % draw segments
          tkzDrawSegment(P_1,P_2)
          % mark angles
          tkzMarkRightAngle(A1,M,P_1)
          % mark points
          tkzDrawPoints[fill=black, size=1mm](P_1,P_2,M)
          tkzLabelPoints[above right](P_1,P_2)
          tkzLabelPoints[right](M)
          % extra text
          tkzText[color=black](1.5,3)leq
          endtikzpicture
          enddocument


          enter image description here






          share|improve this answer
































            8














            This is in principle very simple but tkz-euclide seems to mess up things a bit. One can just use a shading angle, which can, of course, be computed by TikZ.



            documentclass[tikz]standalone
            usetikzlibrarycalc,backgrounds
            usepackageamsmath
            DeclareMathOperatorreRe
            DeclareMathOperatorimIm
            begindocument
            begintikzpicture[anchor=center,declare function=f(x)=x-0.5;
            xmin=-1;xmax=3;]
            draw[-latex] (-1.5,0) -- (3.5,0) node[below left]$re z$;
            draw[-latex] (0,-1.5) -- (0,3.5) node[below left]$im z$;;
            path foreach X/Y/L/P in .5/2/P_1/45, 2.5/0/P_2/45, 1.5/1/M/0
            (X,Y) coordinate[label=P:$L$] (L);
            beginscope[on background layer]
            shade let p1=(xmin,f(xmin)),p2=(xmax,f(xmax)),
            n1=atan2(y2-y1,x2-x1) in
            [left color=white,right color=red,middle color=white,shading angle=n1]
            (p1) -- (p2) -- ($(p2)!2cm!-90:(p1)$) -- ($(p1)!2cm!90:(p2)$)
            ;
            endscope
            draw[red,thick] plot[variable=x,domain=xmin:xmax] (x,f(x));
            draw (P_1) -- (P_2);
            node[anchor=south,red] at (1.5,3) z-z_2;
            endtikzpicture
            enddocument


            enter image description here






            share|improve this answer




















            • 3





              I like your answer, and the correction of re(x) and im(x) :).

              – manooooh
              yesterday


















            8














            You may rotate the shading area to the x-axis, shade, then rotate back.



            enter image description here



            documentclass[tikz,border=5mm]standalone
            usepackagetkz-euclide
            usetkzobjall
            begindocument
            begintikzpicture
            coordinate[label=above right:$P_1$] (P1) at (.5,2);
            coordinate[label=above right:$P_2$] (P2) at (2.5,0);
            coordinate[label=right:$M$] (M) at (1.5,1);
            coordinate (A) at (2,1.5);
            pgfmathsetmacroa.5-sqrt(2)
            pgfmathsetmacrob.5+sqrt(12.5)

            shade[top color=white,bottom color=red!50,rotate around=45:(.5,0)]
            (a,0) rectangle (b,.8);
            tkzMarkRightAngle(P1,M,A)
            draw[-latex] (-1,0)--(3.5,0) node[below]rmRe$(x)$;
            draw[-latex] (0,-1)--(0,3.5) node[left]rmIm$(x)$;

            draw (P1)--(P2);
            draw[red,thick] plot[domain=-.5:3] (x,x-.5);
            foreach p in P1,P2,M
            fill (p) circle(1pt);
            node at (1.8,3.2)z-z_2;
            endtikzpicture
            enddocument





            share|improve this answer




















            • 1





              You don't need tkz-euclide just to mark a right angle. You can (since version 3.1 of TikZ) do it with the standard angles library like this pic[draw]right angle=P1--M--A.

              – Kpym
              yesterday











            • @Kymp: yes, that's also a convernient way

              – Black Mild
              yesterday










            Your Answer








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            3 Answers
            3






            active

            oldest

            votes








            3 Answers
            3






            active

            oldest

            votes









            active

            oldest

            votes






            active

            oldest

            votes









            4














            This is a tkz-euclid solution.



            documentclass[tikz]standalone
            usepackagetkz-euclide,amsmath
            usetkzobjall

            begindocument
            begintikzpicture
            % set working area
            tkzInit[xmin=-1, xmax=3, ymin=-1, ymax=3]
            clip (-1.5,-1.5) rectangle (4,4); % more precise than tkzClip[space=1]
            % define points
            tkzDefPoints.5/2/P_1, 2.5/0/P_2
            tkzDefMidPoint(P_1,P_2)tkzGetPointM
            tkzDefLine[mediator](P_1,P_2)tkzGetPointsA1A2
            tkzDefPointWith[orthogonal,K=-1](A1,M)tkzGetPointA4
            tkzDefPointWith[orthogonal,K=1](A2,M)tkzGetPointA3
            % shade half plane
            tkzFillPolygon[draw=white,top color=white,bottom color=red,middle color=white,shading angle=45](A1,A2,A3,A4)
            tkzDrawSegment[red](A1,A2)
            % draw axes
            tkzDrawX[noticks, label=(operatornameRe(x))]
            tkzDrawY[noticks, label=(operatornameIm(x))]
            % draw segments
            tkzDrawSegment(P_1,P_2)
            % mark angles
            tkzMarkRightAngle(A1,M,P_1)
            % mark points
            tkzDrawPoints[fill=black, size=1mm](P_1,P_2,M)
            tkzLabelPoints[above right](P_1,P_2)
            tkzLabelPoints[right](M)
            % extra text
            tkzText[color=black](1.5,3)leq
            endtikzpicture
            enddocument


            enter image description here






            share|improve this answer





























              4














              This is a tkz-euclid solution.



              documentclass[tikz]standalone
              usepackagetkz-euclide,amsmath
              usetkzobjall

              begindocument
              begintikzpicture
              % set working area
              tkzInit[xmin=-1, xmax=3, ymin=-1, ymax=3]
              clip (-1.5,-1.5) rectangle (4,4); % more precise than tkzClip[space=1]
              % define points
              tkzDefPoints.5/2/P_1, 2.5/0/P_2
              tkzDefMidPoint(P_1,P_2)tkzGetPointM
              tkzDefLine[mediator](P_1,P_2)tkzGetPointsA1A2
              tkzDefPointWith[orthogonal,K=-1](A1,M)tkzGetPointA4
              tkzDefPointWith[orthogonal,K=1](A2,M)tkzGetPointA3
              % shade half plane
              tkzFillPolygon[draw=white,top color=white,bottom color=red,middle color=white,shading angle=45](A1,A2,A3,A4)
              tkzDrawSegment[red](A1,A2)
              % draw axes
              tkzDrawX[noticks, label=(operatornameRe(x))]
              tkzDrawY[noticks, label=(operatornameIm(x))]
              % draw segments
              tkzDrawSegment(P_1,P_2)
              % mark angles
              tkzMarkRightAngle(A1,M,P_1)
              % mark points
              tkzDrawPoints[fill=black, size=1mm](P_1,P_2,M)
              tkzLabelPoints[above right](P_1,P_2)
              tkzLabelPoints[right](M)
              % extra text
              tkzText[color=black](1.5,3)leq
              endtikzpicture
              enddocument


              enter image description here






              share|improve this answer



























                4












                4








                4







                This is a tkz-euclid solution.



                documentclass[tikz]standalone
                usepackagetkz-euclide,amsmath
                usetkzobjall

                begindocument
                begintikzpicture
                % set working area
                tkzInit[xmin=-1, xmax=3, ymin=-1, ymax=3]
                clip (-1.5,-1.5) rectangle (4,4); % more precise than tkzClip[space=1]
                % define points
                tkzDefPoints.5/2/P_1, 2.5/0/P_2
                tkzDefMidPoint(P_1,P_2)tkzGetPointM
                tkzDefLine[mediator](P_1,P_2)tkzGetPointsA1A2
                tkzDefPointWith[orthogonal,K=-1](A1,M)tkzGetPointA4
                tkzDefPointWith[orthogonal,K=1](A2,M)tkzGetPointA3
                % shade half plane
                tkzFillPolygon[draw=white,top color=white,bottom color=red,middle color=white,shading angle=45](A1,A2,A3,A4)
                tkzDrawSegment[red](A1,A2)
                % draw axes
                tkzDrawX[noticks, label=(operatornameRe(x))]
                tkzDrawY[noticks, label=(operatornameIm(x))]
                % draw segments
                tkzDrawSegment(P_1,P_2)
                % mark angles
                tkzMarkRightAngle(A1,M,P_1)
                % mark points
                tkzDrawPoints[fill=black, size=1mm](P_1,P_2,M)
                tkzLabelPoints[above right](P_1,P_2)
                tkzLabelPoints[right](M)
                % extra text
                tkzText[color=black](1.5,3)leq
                endtikzpicture
                enddocument


                enter image description here






                share|improve this answer















                This is a tkz-euclid solution.



                documentclass[tikz]standalone
                usepackagetkz-euclide,amsmath
                usetkzobjall

                begindocument
                begintikzpicture
                % set working area
                tkzInit[xmin=-1, xmax=3, ymin=-1, ymax=3]
                clip (-1.5,-1.5) rectangle (4,4); % more precise than tkzClip[space=1]
                % define points
                tkzDefPoints.5/2/P_1, 2.5/0/P_2
                tkzDefMidPoint(P_1,P_2)tkzGetPointM
                tkzDefLine[mediator](P_1,P_2)tkzGetPointsA1A2
                tkzDefPointWith[orthogonal,K=-1](A1,M)tkzGetPointA4
                tkzDefPointWith[orthogonal,K=1](A2,M)tkzGetPointA3
                % shade half plane
                tkzFillPolygon[draw=white,top color=white,bottom color=red,middle color=white,shading angle=45](A1,A2,A3,A4)
                tkzDrawSegment[red](A1,A2)
                % draw axes
                tkzDrawX[noticks, label=(operatornameRe(x))]
                tkzDrawY[noticks, label=(operatornameIm(x))]
                % draw segments
                tkzDrawSegment(P_1,P_2)
                % mark angles
                tkzMarkRightAngle(A1,M,P_1)
                % mark points
                tkzDrawPoints[fill=black, size=1mm](P_1,P_2,M)
                tkzLabelPoints[above right](P_1,P_2)
                tkzLabelPoints[right](M)
                % extra text
                tkzText[color=black](1.5,3)leq
                endtikzpicture
                enddocument


                enter image description here







                share|improve this answer














                share|improve this answer



                share|improve this answer








                edited 22 hours ago

























                answered yesterday









                KpymKpym

                16.8k24089




                16.8k24089





















                    8














                    This is in principle very simple but tkz-euclide seems to mess up things a bit. One can just use a shading angle, which can, of course, be computed by TikZ.



                    documentclass[tikz]standalone
                    usetikzlibrarycalc,backgrounds
                    usepackageamsmath
                    DeclareMathOperatorreRe
                    DeclareMathOperatorimIm
                    begindocument
                    begintikzpicture[anchor=center,declare function=f(x)=x-0.5;
                    xmin=-1;xmax=3;]
                    draw[-latex] (-1.5,0) -- (3.5,0) node[below left]$re z$;
                    draw[-latex] (0,-1.5) -- (0,3.5) node[below left]$im z$;;
                    path foreach X/Y/L/P in .5/2/P_1/45, 2.5/0/P_2/45, 1.5/1/M/0
                    (X,Y) coordinate[label=P:$L$] (L);
                    beginscope[on background layer]
                    shade let p1=(xmin,f(xmin)),p2=(xmax,f(xmax)),
                    n1=atan2(y2-y1,x2-x1) in
                    [left color=white,right color=red,middle color=white,shading angle=n1]
                    (p1) -- (p2) -- ($(p2)!2cm!-90:(p1)$) -- ($(p1)!2cm!90:(p2)$)
                    ;
                    endscope
                    draw[red,thick] plot[variable=x,domain=xmin:xmax] (x,f(x));
                    draw (P_1) -- (P_2);
                    node[anchor=south,red] at (1.5,3) z-z_2;
                    endtikzpicture
                    enddocument


                    enter image description here






                    share|improve this answer




















                    • 3





                      I like your answer, and the correction of re(x) and im(x) :).

                      – manooooh
                      yesterday















                    8














                    This is in principle very simple but tkz-euclide seems to mess up things a bit. One can just use a shading angle, which can, of course, be computed by TikZ.



                    documentclass[tikz]standalone
                    usetikzlibrarycalc,backgrounds
                    usepackageamsmath
                    DeclareMathOperatorreRe
                    DeclareMathOperatorimIm
                    begindocument
                    begintikzpicture[anchor=center,declare function=f(x)=x-0.5;
                    xmin=-1;xmax=3;]
                    draw[-latex] (-1.5,0) -- (3.5,0) node[below left]$re z$;
                    draw[-latex] (0,-1.5) -- (0,3.5) node[below left]$im z$;;
                    path foreach X/Y/L/P in .5/2/P_1/45, 2.5/0/P_2/45, 1.5/1/M/0
                    (X,Y) coordinate[label=P:$L$] (L);
                    beginscope[on background layer]
                    shade let p1=(xmin,f(xmin)),p2=(xmax,f(xmax)),
                    n1=atan2(y2-y1,x2-x1) in
                    [left color=white,right color=red,middle color=white,shading angle=n1]
                    (p1) -- (p2) -- ($(p2)!2cm!-90:(p1)$) -- ($(p1)!2cm!90:(p2)$)
                    ;
                    endscope
                    draw[red,thick] plot[variable=x,domain=xmin:xmax] (x,f(x));
                    draw (P_1) -- (P_2);
                    node[anchor=south,red] at (1.5,3) z-z_2;
                    endtikzpicture
                    enddocument


                    enter image description here






                    share|improve this answer




















                    • 3





                      I like your answer, and the correction of re(x) and im(x) :).

                      – manooooh
                      yesterday













                    8












                    8








                    8







                    This is in principle very simple but tkz-euclide seems to mess up things a bit. One can just use a shading angle, which can, of course, be computed by TikZ.



                    documentclass[tikz]standalone
                    usetikzlibrarycalc,backgrounds
                    usepackageamsmath
                    DeclareMathOperatorreRe
                    DeclareMathOperatorimIm
                    begindocument
                    begintikzpicture[anchor=center,declare function=f(x)=x-0.5;
                    xmin=-1;xmax=3;]
                    draw[-latex] (-1.5,0) -- (3.5,0) node[below left]$re z$;
                    draw[-latex] (0,-1.5) -- (0,3.5) node[below left]$im z$;;
                    path foreach X/Y/L/P in .5/2/P_1/45, 2.5/0/P_2/45, 1.5/1/M/0
                    (X,Y) coordinate[label=P:$L$] (L);
                    beginscope[on background layer]
                    shade let p1=(xmin,f(xmin)),p2=(xmax,f(xmax)),
                    n1=atan2(y2-y1,x2-x1) in
                    [left color=white,right color=red,middle color=white,shading angle=n1]
                    (p1) -- (p2) -- ($(p2)!2cm!-90:(p1)$) -- ($(p1)!2cm!90:(p2)$)
                    ;
                    endscope
                    draw[red,thick] plot[variable=x,domain=xmin:xmax] (x,f(x));
                    draw (P_1) -- (P_2);
                    node[anchor=south,red] at (1.5,3) z-z_2;
                    endtikzpicture
                    enddocument


                    enter image description here






                    share|improve this answer















                    This is in principle very simple but tkz-euclide seems to mess up things a bit. One can just use a shading angle, which can, of course, be computed by TikZ.



                    documentclass[tikz]standalone
                    usetikzlibrarycalc,backgrounds
                    usepackageamsmath
                    DeclareMathOperatorreRe
                    DeclareMathOperatorimIm
                    begindocument
                    begintikzpicture[anchor=center,declare function=f(x)=x-0.5;
                    xmin=-1;xmax=3;]
                    draw[-latex] (-1.5,0) -- (3.5,0) node[below left]$re z$;
                    draw[-latex] (0,-1.5) -- (0,3.5) node[below left]$im z$;;
                    path foreach X/Y/L/P in .5/2/P_1/45, 2.5/0/P_2/45, 1.5/1/M/0
                    (X,Y) coordinate[label=P:$L$] (L);
                    beginscope[on background layer]
                    shade let p1=(xmin,f(xmin)),p2=(xmax,f(xmax)),
                    n1=atan2(y2-y1,x2-x1) in
                    [left color=white,right color=red,middle color=white,shading angle=n1]
                    (p1) -- (p2) -- ($(p2)!2cm!-90:(p1)$) -- ($(p1)!2cm!90:(p2)$)
                    ;
                    endscope
                    draw[red,thick] plot[variable=x,domain=xmin:xmax] (x,f(x));
                    draw (P_1) -- (P_2);
                    node[anchor=south,red] at (1.5,3) z-z_2;
                    endtikzpicture
                    enddocument


                    enter image description here







                    share|improve this answer














                    share|improve this answer



                    share|improve this answer








                    edited yesterday

























                    answered yesterday









                    marmotmarmot

                    111k5138261




                    111k5138261







                    • 3





                      I like your answer, and the correction of re(x) and im(x) :).

                      – manooooh
                      yesterday












                    • 3





                      I like your answer, and the correction of re(x) and im(x) :).

                      – manooooh
                      yesterday







                    3




                    3





                    I like your answer, and the correction of re(x) and im(x) :).

                    – manooooh
                    yesterday





                    I like your answer, and the correction of re(x) and im(x) :).

                    – manooooh
                    yesterday











                    8














                    You may rotate the shading area to the x-axis, shade, then rotate back.



                    enter image description here



                    documentclass[tikz,border=5mm]standalone
                    usepackagetkz-euclide
                    usetkzobjall
                    begindocument
                    begintikzpicture
                    coordinate[label=above right:$P_1$] (P1) at (.5,2);
                    coordinate[label=above right:$P_2$] (P2) at (2.5,0);
                    coordinate[label=right:$M$] (M) at (1.5,1);
                    coordinate (A) at (2,1.5);
                    pgfmathsetmacroa.5-sqrt(2)
                    pgfmathsetmacrob.5+sqrt(12.5)

                    shade[top color=white,bottom color=red!50,rotate around=45:(.5,0)]
                    (a,0) rectangle (b,.8);
                    tkzMarkRightAngle(P1,M,A)
                    draw[-latex] (-1,0)--(3.5,0) node[below]rmRe$(x)$;
                    draw[-latex] (0,-1)--(0,3.5) node[left]rmIm$(x)$;

                    draw (P1)--(P2);
                    draw[red,thick] plot[domain=-.5:3] (x,x-.5);
                    foreach p in P1,P2,M
                    fill (p) circle(1pt);
                    node at (1.8,3.2)z-z_2;
                    endtikzpicture
                    enddocument





                    share|improve this answer




















                    • 1





                      You don't need tkz-euclide just to mark a right angle. You can (since version 3.1 of TikZ) do it with the standard angles library like this pic[draw]right angle=P1--M--A.

                      – Kpym
                      yesterday











                    • @Kymp: yes, that's also a convernient way

                      – Black Mild
                      yesterday















                    8














                    You may rotate the shading area to the x-axis, shade, then rotate back.



                    enter image description here



                    documentclass[tikz,border=5mm]standalone
                    usepackagetkz-euclide
                    usetkzobjall
                    begindocument
                    begintikzpicture
                    coordinate[label=above right:$P_1$] (P1) at (.5,2);
                    coordinate[label=above right:$P_2$] (P2) at (2.5,0);
                    coordinate[label=right:$M$] (M) at (1.5,1);
                    coordinate (A) at (2,1.5);
                    pgfmathsetmacroa.5-sqrt(2)
                    pgfmathsetmacrob.5+sqrt(12.5)

                    shade[top color=white,bottom color=red!50,rotate around=45:(.5,0)]
                    (a,0) rectangle (b,.8);
                    tkzMarkRightAngle(P1,M,A)
                    draw[-latex] (-1,0)--(3.5,0) node[below]rmRe$(x)$;
                    draw[-latex] (0,-1)--(0,3.5) node[left]rmIm$(x)$;

                    draw (P1)--(P2);
                    draw[red,thick] plot[domain=-.5:3] (x,x-.5);
                    foreach p in P1,P2,M
                    fill (p) circle(1pt);
                    node at (1.8,3.2)z-z_2;
                    endtikzpicture
                    enddocument





                    share|improve this answer




















                    • 1





                      You don't need tkz-euclide just to mark a right angle. You can (since version 3.1 of TikZ) do it with the standard angles library like this pic[draw]right angle=P1--M--A.

                      – Kpym
                      yesterday











                    • @Kymp: yes, that's also a convernient way

                      – Black Mild
                      yesterday













                    8












                    8








                    8







                    You may rotate the shading area to the x-axis, shade, then rotate back.



                    enter image description here



                    documentclass[tikz,border=5mm]standalone
                    usepackagetkz-euclide
                    usetkzobjall
                    begindocument
                    begintikzpicture
                    coordinate[label=above right:$P_1$] (P1) at (.5,2);
                    coordinate[label=above right:$P_2$] (P2) at (2.5,0);
                    coordinate[label=right:$M$] (M) at (1.5,1);
                    coordinate (A) at (2,1.5);
                    pgfmathsetmacroa.5-sqrt(2)
                    pgfmathsetmacrob.5+sqrt(12.5)

                    shade[top color=white,bottom color=red!50,rotate around=45:(.5,0)]
                    (a,0) rectangle (b,.8);
                    tkzMarkRightAngle(P1,M,A)
                    draw[-latex] (-1,0)--(3.5,0) node[below]rmRe$(x)$;
                    draw[-latex] (0,-1)--(0,3.5) node[left]rmIm$(x)$;

                    draw (P1)--(P2);
                    draw[red,thick] plot[domain=-.5:3] (x,x-.5);
                    foreach p in P1,P2,M
                    fill (p) circle(1pt);
                    node at (1.8,3.2)z-z_2;
                    endtikzpicture
                    enddocument





                    share|improve this answer















                    You may rotate the shading area to the x-axis, shade, then rotate back.



                    enter image description here



                    documentclass[tikz,border=5mm]standalone
                    usepackagetkz-euclide
                    usetkzobjall
                    begindocument
                    begintikzpicture
                    coordinate[label=above right:$P_1$] (P1) at (.5,2);
                    coordinate[label=above right:$P_2$] (P2) at (2.5,0);
                    coordinate[label=right:$M$] (M) at (1.5,1);
                    coordinate (A) at (2,1.5);
                    pgfmathsetmacroa.5-sqrt(2)
                    pgfmathsetmacrob.5+sqrt(12.5)

                    shade[top color=white,bottom color=red!50,rotate around=45:(.5,0)]
                    (a,0) rectangle (b,.8);
                    tkzMarkRightAngle(P1,M,A)
                    draw[-latex] (-1,0)--(3.5,0) node[below]rmRe$(x)$;
                    draw[-latex] (0,-1)--(0,3.5) node[left]rmIm$(x)$;

                    draw (P1)--(P2);
                    draw[red,thick] plot[domain=-.5:3] (x,x-.5);
                    foreach p in P1,P2,M
                    fill (p) circle(1pt);
                    node at (1.8,3.2)z-z_2;
                    endtikzpicture
                    enddocument






                    share|improve this answer














                    share|improve this answer



                    share|improve this answer








                    edited 3 hours ago

























                    answered yesterday









                    Black MildBlack Mild

                    722611




                    722611







                    • 1





                      You don't need tkz-euclide just to mark a right angle. You can (since version 3.1 of TikZ) do it with the standard angles library like this pic[draw]right angle=P1--M--A.

                      – Kpym
                      yesterday











                    • @Kymp: yes, that's also a convernient way

                      – Black Mild
                      yesterday












                    • 1





                      You don't need tkz-euclide just to mark a right angle. You can (since version 3.1 of TikZ) do it with the standard angles library like this pic[draw]right angle=P1--M--A.

                      – Kpym
                      yesterday











                    • @Kymp: yes, that's also a convernient way

                      – Black Mild
                      yesterday







                    1




                    1





                    You don't need tkz-euclide just to mark a right angle. You can (since version 3.1 of TikZ) do it with the standard angles library like this pic[draw]right angle=P1--M--A.

                    – Kpym
                    yesterday





                    You don't need tkz-euclide just to mark a right angle. You can (since version 3.1 of TikZ) do it with the standard angles library like this pic[draw]right angle=P1--M--A.

                    – Kpym
                    yesterday













                    @Kymp: yes, that's also a convernient way

                    – Black Mild
                    yesterday





                    @Kymp: yes, that's also a convernient way

                    – Black Mild
                    yesterday

















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