Proper way to crop an SVG? -

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i'm totally baffled svg images. want crop image core content. want crop specifying viewbox and/or viewport and/or else except not want change of points in polyline elements. image as-is renders this. (note border illustration purposes. border not part of svg.)

original

and want crop looks this. (note border again illustration purposes only)

cropped

given svg xml how crop it?

<?xml version="1.0" encoding="utf-8"?> <svg xmlns="http://www.w3.org/2000/svg" version="1.1" >     <polyline points="39,340  42,338  47,333  54,322  68,308  83,292  91,277  100,259  106" style="fill:none;stroke:black;stroke-width:3"/>     <polyline points="71,299  82,303  95,304  109,302  120,301" style="fill:none;stroke:black;stroke-width:3"/>     <polyline points="212,275  228,254  233,233  240,208  239,246  188,278  174,306  158,334  149,351  144,358  140,362  139,362  139,340  179,313  186" style="fill:none;stroke:black;stroke-width:3"/>     <polyline points="169,345  174,347  227,333  231,330  330,371  328,374  414,209  410,192  404,183  401,177  398,177  395,179   379,340  385,384  397,414" style="fill:none;stroke:black;stroke-width:3"/> </svg>

when svg inline, can compute viewbox using getbbox() root svg.

below example polylines:

<!doctype html> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>compute viewbox</title> <meta http-equiv="content-type" content="text/html; charset=utf-8"> </head> <body> <center> <h3>compute viewbox</h3> <div id=svgdiv style='background-color:lightgreen'> <svg id=mysvg>     <polyline points="39,340  42,338  47,333  54,322  68,308  83,292  91,277  100,259" style="fill:none;stroke:black;stroke-width:3"/>     <polyline points="71,299  82,303  95,304  109,302  120,301" style="fill:none;stroke:black;stroke-width:3"/>     <polyline points="212,275  228,254  233,233  240,208  239,246  188,278  174,306  158,334  149,351  144,358  140,362  139,362  139,340  179,313  " style="fill:none;stroke:black;stroke-width:3"/>     <polyline points="169,345  174,347  227,333  231,330  330,371  328,374  414,209  410,192  404,183  401,177  398,177  395,179   379,340  385,384  397,414" style="fill:none;stroke:black;stroke-width:3"/> </svg> </div> <button onclick=fit()>fit</button> viewvox:<input type=text size=20 id=vbvalue /> </center> </body> <script>  //---button-- function fit() {     var bb=mysvg.getbbox()     var bbx=bb.x     var bby=bb.y     var bbw=bb.width     var bbh=bb.height     var vb=[bbx,bby,bbw,bbh]     mysvg.setattribute("viewbox", vb.join(" ") )     vbvalue.value=vb.join(" ")     svgdiv.style.width=bbw+"px"     svgdiv.style.height=bbh+"px" } </script> </html>

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