SVG rounded corner

Question

I have the following SVG   x000D   x000D   lt svg gt     lt g gt       lt path id  k9ffd8001  d  M64 5 45 5 82 5 45 5 82 5 64 5 64 5 64 5 z  stroke   808600  stroke-width  0  transform  rotate 0 0 0   stroke-linecap  square  stroke-linejoin  round  fill-opacity  1  stroke-opacity  1  fill   a0a700  gt  lt  path gt       lt path id  kb8000001  d  M64 5 45 5 82 5 45 5 82 5 64 5 64 5 64 5 z  stroke   808600  stroke-width  0  transform  rotate 0 0 0   stroke-linecap  square  stroke-linejoin  round  fill-opacity  1  stroke-opacity  1  fill  url  k9ffb0001   gt  lt  path gt     lt  g gt   lt  svg gt  x000D   x000D   x000D   I want to get a CSS-like border-top-right-radius and border-top-bottom-radius effect  How can I achieve that rounded corner effect

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Not sure why nobody posted an actual SVG answer. Here is an SVG rectangle with rounded corners (radius 3) on the top:

<svg:path d="M0,0 L0,27 A3,3 0 0,0 3,30 L7,30 A3,3 0 0,0 10,27 L10,0 Z" />

This is a Move To (M), Line To (L), Arc To (A), Line To (L), Arc To (A), Line To (L), Close Path (Z).

The comma-delimited numbers are absolute coordinates. The arcs are defined with additional parameters specifying the radius and type of arc. This could also be accomplished with relative coordinates (use lower-case letters for L and A).

The complete reference for those commands is on the W3C SVG Paths page, and additional reference material on SVG paths can be found in this article.

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This basically does the same as Mvins answer  but is a more compressed down and simplified version  It works by going back the distance of the radius of the lines adjacent to the corner and connecting both ends with a bezier curve whose control point is at the original corner point  function createRoundedPath coords  radius  close      let path    quot  quot    const length   coords length    close   1   -1    for  let i   0  i  lt  length  i          const a   coords i   coords length      const b   coords  i   1    coords length      const t   Math min radius   Math hypot b x - a x  b y - a y   0 5       if  i  gt  0  path     Q  a x    a y    a x    1 - t    b x   t    a y    1 - t    b y   t        if   close  amp  amp  i    0  path     M  a x    a y       else if  i    0  path     M  a x    1 - t    b x   t    a y    1 - t    b y   t        if   close  amp  amp  i    length - 1  path     L  b x    b y       else if  i  lt  length - 1  path     L  a x   t   b x    1 - t     a y   t   b y    1 - t          if  close  path     quot Z quot    return path

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For my case I need to radius begin and end of path   With stroke-linecap  round  I change it to what I want

User · Answer

You are using a path element  why don t you just give the path a curve  See here for how to make curves using path elements  http   www w3 org TR SVG paths html PathDataCurveCommands

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I found a solution but it is a bit hacky so it may not always work  I found that if you have an arc  A or a  with really small values it forces it to create a curve in one spot thus forming a rounded comer      x000D   x000D   lt svg viewBox  0 0 1 0 6  stroke  black  fill  grey  style  stroke-width 0 05px   gt  x000D     lt path d  M0 7 0 2 L0 1 0 1 A0 0001 0 0001 0 0 0 0 099 0 101 L0 5 0 5Z  gt  lt  path gt  x000D   lt  svg gt  x000D   x000D   x000D

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As referenced in my answer to Applying rounded corners to paths polygons  I have written a routine in javascript for generically rounding corners of SVG paths  with examples  here  http   plnkr co edit kGnGGyoOCKil02k04snu   It will work independently from any stroke effects you may have  To use  include the rounding js file from the Plnkr and call the function like so   roundPathCorners pathString  radius  useFractionalRadius    The result will be the rounded path   The results look like this

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Just to simplify implementing answer of  hmak me  here s a commented piece of React code to generate rounded rectangles   const Rect     width  height  round  strokeWidth     gt           overhang over given width and height that we get due to stroke width     const s   strokeWidth   2          how many pixels do we need to cut from vertical and horizontal parts        due to rounded corners and stroke width     const over   2   round   strokeWidth          lengths of straight lines     const w   width - over      const h   height - over          beware that extra spaces will not be minified        they are added for clarity     const d             M  round   s    s          h  w          a  round    round  0 0 1   round    round          v  h          a  round    round  0 0 1 -  round    round          h-  w          a  round    round  0 0 1 -  round  -  round          v-  h          a  round    round  0 0 1   round  -  round          z            return            lt svg width  width  height  height  gt               lt path d  d  fill  none  stroke  black  strokeWidth  strokeWidth    gt           lt  svg gt             ReactDOM render       lt Rect width  64  height  32  strokeWidth  2  round  4    gt       document querySelector   app         Jsfiddle link

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I d also consider using a plain old  lt rect gt  which provides the rx and ry attributes  MDN SVG docs  lt - note the second drawn rect element

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I ve happened upon this problem today myself and managed to solve it by writing a small JavaScript function  From what I can tell  there is no easy way to give a path element in an SVG rounded corners except if you only need the borders to be rounded  in which case the  CSS  attributes stroke  stroke-width and most importantly stroke-linejoin  quot round quot  are perfectly sufficient  However  in my case I used a path object to create custom shapes with n corners that are filled out with a certain color and don t have visible borders  much like this   I managed to write a quick function that takes an array of coordinates for an SVG path and returns the finished path string to put in the d attribute of the path html element  The resulting shape will then look something like this   Here is the function         Creates a coordinate path for the Path SVG element with rounded corners     param pathCoords - An array of coordinates in the form   x  Number  y  Number            function createRoundedPathString pathCoords        const path           const curveRadius   3          Reset indexes  so there are no gaps     pathCoords   pathCoords slice         for  let i   0  i  lt  pathCoords length  i                1  Get current coord and the next two  startpoint  cornerpoint  endpoint  to calculate rounded curve       const c2Index     i   1   gt  pathCoords length - 1     i   1    pathCoords length   i   1        const c3Index     i   2   gt  pathCoords length - 1     i   2    pathCoords length   i   2         const c1   pathCoords i         const c2   pathCoords c2Index         const c3   pathCoords c3Index             2  For each 3 coords  enter two new path commands  Line to start of curve  bezier curve around corner            Calculate curvePoint c1 - gt  c2       const c1c2Distance   Math sqrt Math pow c1 x - c2 x  2    Math pow c1 y - c2 y  2          const c1c2DistanceRatio    c1c2Distance - curveRadius    c1c2Distance        const c1c2CurvePoint               1 - c1c2DistanceRatio    c1 x   c1c2DistanceRatio   c2 x  toFixed 1             1 - c1c2DistanceRatio    c1 y   c1c2DistanceRatio   c2 y  toFixed 1                     Calculate curvePoint c2 - gt  c3       const c2c3Distance   Math sqrt Math pow c2 x - c3 x  2    Math pow c2 y - c3 y  2          const c2c3DistanceRatio   curveRadius   c2c3Distance        const c2c3CurvePoint               1 - c2c3DistanceRatio    c2 x   c2c3DistanceRatio   c3 x  toFixed 1             1 - c2c3DistanceRatio    c2 y   c2c3DistanceRatio   c3 y  toFixed 1                     If at last coord of polygon  also save that as starting point       if  i     pathCoords length - 1            path unshift  M    c2c3CurvePoint join                          Line to start of curve  L endcoord        path push  L    c1c2CurvePoint join                 Bezier line around curve  Q controlcoord endcoord        path push  Q    c2 x         c2 y         c2c3CurvePoint join                     Logically connect path to starting point again  shouldn t be necessary as path ends there anyway  but seems cleaner      path push  Z         return path join          You can determine the rounding strength by setting the curveRadius variable at the top  The default is 3 for a 100x100  viewport  coordinate system  but depending on the size of your SVG  you may need to adjust this

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Here is how you can create a rounded rectangle with SVG Path    lt path d  M100 100 h200 a20 20 0 0 1 20 20 v200 a20 20 0 0 1 -20 20 h-200 a20 20 0 0 1 -20 -20 v-200 a20 20 0 0 1 20 -20 z    gt    Explanation  m100 100  move to point 100 100   h200  draw a 200px horizontal line from where we are  a20 20 0 0 1 20 20  draw an arc with 20px X radius  20px Y radius  clockwise  to a point with 20px difference in X and Y axis  v200  draw a 200px vertical line from where we are  a20 20 0 0 1 -20 20  draw an arc with 20px X and Y radius  clockwise  to a point with -20px difference in X and 20px difference in Y axis  h-200  draw a -200px horizontal line from where we are  a20 20 0 0 1 -20 -20  draw an arc with 20px X and Y radius  clockwise  to a point with -20px difference in X and -20px difference in Y axis  v-200  draw a -200px vertical line from where we are  a20 20 0 0 1 20 -20  draw an arc with 20px X and Y radius  clockwise  to a point with 20px difference in X and -20px difference in Y axis  z  close the path   x000D   x000D   lt svg width  440  height  440  gt  x000D     lt path d  M100 100 h200 a20 20 0 0 1 20 20 v200 a20 20 0 0 1 -20 20 h-200 a20 20 0 0 1 -20 -20 v-200 a20 20 0 0 1 20 -20 z  fill  none  stroke  black  stroke-width  3    gt  x000D   lt  svg gt  x000D   x000D   x000D

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You have explicitly set your stroke-linejoin to round but your stroke-width to 0  so of course you re not going to see rounded corners if you have no stroke to round   Here s a modified example with rounded corners made through strokes  http   jsfiddle net 8uxqK 1    lt path d  M64 5 45 5 82 5 45 5 82 5 64 5 64 5 64 5 z        stroke-width  5        stroke-linejoin  round        stroke   808600        fill   a0a700    gt    Otherwise   if you need an actual rounded shape fill and not just a rounded fatty stroke   you must do what  Jlange says and make an actual rounded shape

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lt  php  radius   20   thichness   4   size   200   if  s     circle      echo   lt svg width       size      height       size      gt      echo   lt circle cx        size 2       cy        size 2       r         size 2 - thichness       stroke  black  stroke-width       thichness      fill  none    gt      echo   lt  svg gt     elseif  s     square      echo   lt svg width       size      height       size      gt      echo   lt path d  M      radius  thichness            thichness      h      size-  radius 2 -  thichness 2       a     radius          radius     0 0 1      radius          radius     v      size-  radius 2 -  thichness 2       a     radius          radius     0 0 1 -     radius          radius     h-      size-  radius 2 -  thichness 2       a     radius          radius     0 0 1 -     radius     -     radius     v-      size-  radius 2 -  thichness 2       a     radius          radius     0 0 1      radius     -     radius     z  fill  none  stroke  black  stroke-width       thichness        gt      echo   lt  svg gt        gt

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Here are some paths for tabs   https   codepen io mochime pen VxxzMW   x000D   x000D   lt  -- left tab -- gt  x000D   lt div gt  x000D     lt svg width  60  height  60  gt  x000D       lt path d  M10 10  x000D               a10 10 0 0 1 10 -10 x000D               h 50    x000D               v 47 x000D               h -50 x000D               a10 10 0 0 1 -10 -10 x000D               z  x000D        fill   ff3600  gt  lt  path gt  x000D     lt  svg gt  x000D   lt  div gt  x000D   x000D   lt  -- right tab -- gt  x000D   lt div gt  x000D     lt svg width  60  height  60  gt  x000D       lt path d  M10 0    x000D               h 40 x000D               a10 10 0 0 1 10 10 x000D               v 27 x000D               a10 10 0 0 1 -10 10 x000D               h -40 x000D               z  x000D        fill   ff3600  gt  lt  path gt  x000D     lt  svg gt  x000D   lt  div gt  x000D   x000D   lt  -- tab tab    -- gt  x000D   lt div gt  x000D     lt svg width  60  height  60  gt  x000D       lt path d  M10 40  x000D               v -30 x000D               a10 10 0 0 1 10 -10 x000D               h 30 x000D               a10 10 0 0 1 10 10 x000D               v 30 x000D               z  x000D        fill   ff3600  gt  lt  path gt  x000D     lt  svg gt  x000D   lt  div gt  x000D   x000D   x000D    The other answers explained the mechanics   I especially liked hossein-maktoobian s answer   The paths in the pen do the brunt of the work   the values can be modified to suite whatever desired dimensions

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This question is the first result for Googling  svg rounded corners path   Phrogz suggestion to use stroke has some limitations  namely  that I cannot use stroke for other purposes  and that the dimensions have to be corrected for the stroke width    Jlange suggestion to use a curve is better  but not very concrete  I ended up using quadratic B  zier curves for drawing rounded corners  Consider this picture of a corner marked with a blue dot and two red points on adjacent edges     The two lines could be made with the L command  To turn this sharp corner into a rounded corner  start drawing a curve from the left red point  use M x y to move to that point   Now a quadratic B  zier curve has just a single control point which you must set on the blue point  Set the end of the curve at the right red point  As the tangent at the two red points are in the direction of the previous lines  you will see a fluent transition   rounded corners    Now to continue the shape after the rounded corner  a straight line in a B  zier curve can be achieved by setting the control point between on the line between the two corners   To help me with determining the path  I wrote this Python script that accepts edges and a radius  Vector math makes this actually very easy  The resulting image from the output        usr bin env python   Given some vectors and a border-radius  output a SVG path with rounded   corners      Copyright  C  Peter Wu  lt peter lekensteyn nl gt   from math import sqrt  class Vector object       def   init   self  x  y           self x   x         self y   y      def sub self  vec           return Vector self x - vec x  self y - vec y       def add self  vec           return Vector self x   vec x  self y   vec y       def scale self  n           return Vector self x   n  self y   n       def length self           return sqrt self x  2   self y  2       def normal self           length   self length           return Vector self x   length  self y   length       def   str   self           x   round self x  2          y   round self y  2          return         format x  y     A line from vec from to vec to def line vec from  vec to       half vec   vec from add vec to sub vec from  scale  5       return         format half vec  vec to     Adds  n  units to vec from pointing in direction vec to def vecDir vec from  vec to  n       return vec from add vec to sub vec from  normal   scale n      Draws a line  but skips  r  units from the begin and end def lineR vec from  vec to  r       vec   vec to sub vec from  normal   scale r      return line vec from add vec   vec to sub vec      An edge in vec from  to vec to with radius r def edge vec from  vec to  r       v   vecDir vec from  vec to  r      return         format vec from  v      Hard-coded border-radius and vectors r   5 a   Vector   0   60  b   Vector 100    0  c   Vector 100  200  d   Vector   0  200 - 60   path        Start below top-left edge path append  M    Q  format a add Vector 0  r        top-left edge    path append edge a  b  r   path append lineR a  b  r   path append edge b  c  r   path append lineR b  c  r   path append edge c  d  r   path append lineR c  d  r   path append edge d  a  r   path append lineR d  a  r      Show results that can be pushed into a  lt path d         gt  for part in path      print part

[xml] SVG rounded corner

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