How to fade a semiplane defined by line? The 2019 Stack Overflow Developer Survey Results Are InHow 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?

Can't find the latex code for the ⍎ (down tack jot) symbol

How to reverse every other sublist of a list?

Confusion about non-derivable continuous functions

What is the use of option -o in the useradd command?

Why could you hear an Amstrad CPC working?

It's possible to achieve negative score?

Inline version of a function returns different value then non-inline version

How to answer pointed "are you quitting" questioning when I don't want them to suspect

What is the motivation for a law requiring 2 parties to consent for recording a conversation

Geography at the pixel level

"Riffle" two strings

Which Sci-Fi work first showed weapon of galactic-scale mass destruction?

What is a mixture ratio of propellant?

How come people say “Would of”?

Could JWST stay at L2 "forever"?

Is bread bad for ducks?

How to change the limits of integration

Time travel alters history but people keep saying nothing's changed

What does "rabbited" mean/imply in this sentence?

Does it makes sense to buy a new cycle to learn riding?

Why is my p-value correlated to difference between means in two sample tests?

How was Skylab's orbit inclination chosen?

How long do I have to send payment?

Why isn't airport relocation done gradually?



How to fade a semiplane defined by line?



The 2019 Stack Overflow Developer Survey Results Are InHow 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 Mar 22 at 21:24









      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))
          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) leq;
            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
              Mar 23 at 2:44


















            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
              Mar 23 at 7:29











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

              – Black Mild
              Mar 23 at 9:12











            Your Answer








            StackExchange.ready(function()
            var channelOptions =
            tags: "".split(" "),
            id: "85"
            ;
            initTagRenderer("".split(" "), "".split(" "), channelOptions);

            StackExchange.using("externalEditor", function()
            // Have to fire editor after snippets, if snippets enabled
            if (StackExchange.settings.snippets.snippetsEnabled)
            StackExchange.using("snippets", function()
            createEditor();
            );

            else
            createEditor();

            );

            function createEditor()
            StackExchange.prepareEditor(
            heartbeatType: 'answer',
            autoActivateHeartbeat: false,
            convertImagesToLinks: false,
            noModals: true,
            showLowRepImageUploadWarning: true,
            reputationToPostImages: null,
            bindNavPrevention: true,
            postfix: "",
            imageUploader:
            brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
            contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
            allowUrls: true
            ,
            onDemand: true,
            discardSelector: ".discard-answer"
            ,immediatelyShowMarkdownHelp:true
            );



            );













            draft saved

            draft discarded


















            StackExchange.ready(
            function ()
            StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2ftex.stackexchange.com%2fquestions%2f480985%2fhow-to-fade-a-semiplane-defined-by-line%23new-answer', 'question_page');

            );

            Post as a guest















            Required, but never shown

























            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))
            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))
              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))
                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))
                endtikzpicture
                enddocument


                enter image description here







                share|improve this answer














                share|improve this answer



                share|improve this answer








                edited Mar 23 at 11:05

























                answered Mar 23 at 8:28









                KpymKpym

                17.8k24191




                17.8k24191





















                    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) leq;
                    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
                      Mar 23 at 2:44















                    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) leq;
                    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
                      Mar 23 at 2:44













                    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) leq;
                    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) leq;
                    endtikzpicture
                    enddocument


                    enter image description here







                    share|improve this answer














                    share|improve this answer



                    share|improve this answer








                    edited Mar 22 at 23:05

























                    answered Mar 22 at 21:59









                    marmotmarmot

                    116k5149280




                    116k5149280







                    • 3





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

                      – manooooh
                      Mar 23 at 2:44












                    • 3





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

                      – manooooh
                      Mar 23 at 2:44







                    3




                    3





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

                    – manooooh
                    Mar 23 at 2:44





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

                    – manooooh
                    Mar 23 at 2:44











                    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
                      Mar 23 at 7:29











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

                      – Black Mild
                      Mar 23 at 9:12















                    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
                      Mar 23 at 7:29











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

                      – Black Mild
                      Mar 23 at 9:12













                    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 Mar 24 at 6:24

























                    answered Mar 22 at 22:00









                    Black MildBlack Mild

                    732611




                    732611







                    • 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
                      Mar 23 at 7:29











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

                      – Black Mild
                      Mar 23 at 9:12












                    • 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
                      Mar 23 at 7:29











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

                      – Black Mild
                      Mar 23 at 9:12







                    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
                    Mar 23 at 7:29





                    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
                    Mar 23 at 7:29













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

                    – Black Mild
                    Mar 23 at 9:12





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

                    – Black Mild
                    Mar 23 at 9:12

















                    draft saved

                    draft discarded
















































                    Thanks for contributing an answer to TeX - LaTeX Stack Exchange!


                    • Please be sure to answer the question. Provide details and share your research!

                    But avoid


                    • Asking for help, clarification, or responding to other answers.

                    • Making statements based on opinion; back them up with references or personal experience.

                    To learn more, see our tips on writing great answers.




                    draft saved


                    draft discarded














                    StackExchange.ready(
                    function ()
                    StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2ftex.stackexchange.com%2fquestions%2f480985%2fhow-to-fade-a-semiplane-defined-by-line%23new-answer', 'question_page');

                    );

                    Post as a guest















                    Required, but never shown





















































                    Required, but never shown














                    Required, but never shown












                    Required, but never shown







                    Required, but never shown

































                    Required, but never shown














                    Required, but never shown












                    Required, but never shown







                    Required, but never shown







                    Popular posts from this blog

                    How should I support this large drywall patch? Planned maintenance scheduled April 23, 2019 at 00:00UTC (8:00pm US/Eastern) Announcing the arrival of Valued Associate #679: Cesar Manara Unicorn Meta Zoo #1: Why another podcast?How do I cover large gaps in drywall?How do I keep drywall around a patch from crumbling?Can I glue a second layer of drywall?How to patch long strip on drywall?Large drywall patch: how to avoid bulging seams?Drywall Mesh Patch vs. Bulge? To remove or not to remove?How to fix this drywall job?Prep drywall before backsplashWhat's the best way to fix this horrible drywall patch job?Drywall patching using 3M Patch Plus Primer

                    random experiment with two different functions on unit interval Announcing the arrival of Valued Associate #679: Cesar Manara Planned maintenance scheduled April 23, 2019 at 00:00UTC (8:00pm US/Eastern)Random variable and probability space notionsRandom Walk with EdgesFinding functions where the increase over a random interval is Poisson distributedNumber of days until dayCan an observed event in fact be of zero probability?Unit random processmodels of coins and uniform distributionHow to get the number of successes given $n$ trials , probability $P$ and a random variable $X$Absorbing Markov chain in a computer. Is “almost every” turned into always convergence in computer executions?Stopped random walk is not uniformly integrable

                    Lowndes Grove History Architecture References Navigation menu32°48′6″N 79°57′58″W / 32.80167°N 79.96611°W / 32.80167; -79.9661132°48′6″N 79°57′58″W / 32.80167°N 79.96611°W / 32.80167; -79.9661178002500"National Register Information System"Historic houses of South Carolina"Lowndes Grove""+32° 48' 6.00", −79° 57' 58.00""Lowndes Grove, Charleston County (260 St. Margaret St., Charleston)""Lowndes Grove"The Charleston ExpositionIt Happened in South Carolina"Lowndes Grove (House), Saint Margaret Street & Sixth Avenue, Charleston, Charleston County, SC(Photographs)"Plantations of the Carolina Low Countrye