jasper reports - Border Artifacts in JasperReport PDF Designed with iReport 5.1.0 -

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when generating report jasperreports, seeing weird borders drawn reporting engine. borders drawn lines jut out @ 100% zoom level, seen in image. means when attempt draw square textbox, not square unless zoom in 150% more. here image showing issue.

bad table

am doing wrong when setting border settings in ireport? how can fix problem?

i had same problem. when exporting tables pdf , using thin table borders, lines of cell borders seem overstrike borders of table 1 pixel. visual artifacts visible in pdf viewers (they visible in adobe reader) , @ zoom levels. appearance of artifacts changes when line art smoothing turned on or off in pdf viewer. if zoom on overstrike @ maximal level, see lines drawn correctly - artifacts made pdf viewer when scaling document.

when checking jasperreports code, i've found pdf export draws table border 4 single lines. drawn no caps (the line cut off @ end). when drawing square border way, corners not connect completely, each line drawn longer border compensate missing cap. algorithm seems correct me, there going on in adobe reader, rounding , image "improvements" cause image artifacts appear.

i able come solution fixes issue in case. have subclassed jrpdfexporter , modified code draws borders. usage simple, use class instead of jrpdfexporter. use jasperreports 5.0.0.

package cz.jwa.jasper;  import java.awt.color;  import net.sf.jasperreports.engine.jrlinebox; import net.sf.jasperreports.engine.jrpen; import net.sf.jasperreports.engine.jrprintelement; import net.sf.jasperreports.engine.export.jrpdfexporter; import net.sf.jasperreports.engine.export.legacy.borderoffset; import net.sf.jasperreports.engine.type.linestyleenum;  import com.lowagie.text.rectangle; import com.lowagie.text.pdf.pdfcontentbyte;  public class jwapdfexporter extends jrpdfexporter {   protected void exportbox(jrlinebox box, jrprintelement element)   {     if(!isboxvisible(box)) return;      pdfcontentbyte.setlinecap(pdfcontentbyte.line_cap_projecting_square);          float x1 = element.getx() + getoffsetx();     float y1 = jasperprint.getpageheight() - element.gety() - getoffsety();     float x2 = element.getx() + getoffsetx() + element.getwidth();     float y2 = jasperprint.getpageheight() - element.gety() - getoffsety() - element.getheight();       rectangle r = new rectangle(x1, y2, x2, y1);      int borderflag = 0;      boolean same = true;      float linewidth = 0;     color linecolor = null;      if(box.getleftpen().getlinewidth().floatvalue() > 0f)     {       borderflag |= rectangle.left;       linewidth = box.getleftpen().getlinewidth().floatvalue();       linecolor = box.getleftpen().getlinecolor();      }      if(box.gettoppen().getlinewidth().floatvalue() > 0f)     {       borderflag |= rectangle.top;       if(linewidth == 0)       {         linewidth = box.gettoppen().getlinewidth().floatvalue();         linecolor = box.gettoppen().getlinecolor();        }       else if(linewidth != box.gettoppen().getlinewidth().floatvalue()           || !linecolor.equals(box.gettoppen().getlinecolor()))       {         same = false;       }     }      if(box.getrightpen().getlinewidth().floatvalue() > 0f)     {       borderflag |= rectangle.right;       if(linewidth == 0)       {         linewidth = box.getrightpen().getlinewidth().floatvalue();         linecolor = box.getrightpen().getlinecolor();        }       else if(linewidth != box.getrightpen().getlinewidth().floatvalue()           || !linecolor.equals(box.getrightpen().getlinecolor()))       {         same = false;       }     }      if(box.getbottompen().getlinewidth().floatvalue() > 0f)     {       borderflag |= rectangle.bottom;       if(linewidth == 0)       {         linewidth = box.getbottompen().getlinewidth().floatvalue();         linecolor = box.getbottompen().getlinecolor();        }       else if(linewidth != box.getbottompen().getlinewidth().floatvalue()           || !linecolor.equals(box.getbottompen().getlinecolor()))       {         same = false;       }     }      if(same)     {       r.setborder(borderflag);       r.setbordercolor(linecolor);       r.setborderwidth(linewidth);        pdfcontentbyte.rectangle(r);       pdfcontentbyte.stroke();        pdfcontentbyte.setlinedash(0.0f);       pdfcontentbyte.setlinecap(pdfcontentbyte.line_cap_projecting_square);        }     else     {       super.exportbox(box, element);     }       }    private boolean isboxvisible(jrlinebox box)   {     return box.getleftpen().getlinewidth().floatvalue() > 0f          || box.gettoppen().getlinewidth().floatvalue() > 0f         || box.getrightpen().getlinewidth().floatvalue() > 0f         || box.getbottompen().getlinewidth().floatvalue() > 0f         ;   }    protected void exporttoppen(       jrpen toppen,        jrpen leftpen,        jrpen rightpen,        jrprintelement element)     {       if (toppen.getlinewidth().floatvalue() > 0f)       {         float leftoffset = 0; //leftpen.getlinewidth().floatvalue() / 2 - borderoffset.getoffset(leftpen);         float rightoffset = 0; //rightpen.getlinewidth().floatvalue() / 2 - borderoffset.getoffset(rightpen);          preparepen(pdfcontentbyte, toppen, pdfcontentbyte.line_cap_butt);          if (toppen.getlinestylevalue() == linestyleenum.double)         {           float topoffset = toppen.getlinewidth().floatvalue();            pdfcontentbyte.moveto(             element.getx() + getoffsetx() - leftoffset,             jasperprint.getpageheight() - element.gety() - getoffsety() + topoffset / 3             );           pdfcontentbyte.lineto(             element.getx() + getoffsetx() + element.getwidth() + rightoffset,             jasperprint.getpageheight() - element.gety() - getoffsety() + topoffset / 3             );           pdfcontentbyte.stroke();            pdfcontentbyte.moveto(             element.getx() + getoffsetx() + leftoffset / 3,             jasperprint.getpageheight() - element.gety() - getoffsety() - topoffset / 3             );           pdfcontentbyte.lineto(             element.getx() + getoffsetx() + element.getwidth() - rightoffset / 3,             jasperprint.getpageheight() - element.gety() - getoffsety() - topoffset / 3             );           pdfcontentbyte.stroke();         }         else         {           float topoffset =  borderoffset.getoffset(toppen);           pdfcontentbyte.moveto(             element.getx() + getoffsetx() - leftoffset,             jasperprint.getpageheight() - element.gety() - getoffsety() - topoffset             );           pdfcontentbyte.lineto(             element.getx() + getoffsetx() + element.getwidth() + rightoffset,             jasperprint.getpageheight() - element.gety() - getoffsety() - topoffset             );           pdfcontentbyte.stroke();         }       }     }    protected void exportleftpen(jrpen toppen, jrpen leftpen, jrpen bottompen, jrprintelement element)   {     if (leftpen.getlinewidth().floatvalue() > 0f)     {       float topoffset = 0; //toppen.getlinewidth().floatvalue() / 2 - borderoffset.getoffset(toppen);       float bottomoffset = 0; //bottompen.getlinewidth().floatvalue() / 2 - borderoffset.getoffset(bottompen);        preparepen(pdfcontentbyte, leftpen, pdfcontentbyte.line_cap_butt);        if (leftpen.getlinestylevalue() == linestyleenum.double)       {         float leftoffset = leftpen.getlinewidth().floatvalue();          pdfcontentbyte.moveto(           element.getx() + getoffsetx() - leftoffset / 3,           jasperprint.getpageheight() - element.gety() - getoffsety() + topoffset           );         pdfcontentbyte.lineto(           element.getx() + getoffsetx() - leftoffset / 3,           jasperprint.getpageheight() - element.gety() - getoffsety() - element.getheight() - bottomoffset           );         pdfcontentbyte.stroke();          pdfcontentbyte.moveto(           element.getx() + getoffsetx() + leftoffset / 3,           jasperprint.getpageheight() - element.gety() - getoffsety() - topoffset / 3           );         pdfcontentbyte.lineto(           element.getx() + getoffsetx() + leftoffset / 3,           jasperprint.getpageheight() - element.gety() - getoffsety() - element.getheight() + bottomoffset / 3           );         pdfcontentbyte.stroke();       }       else       {         float leftoffset =  borderoffset.getoffset(leftpen);         pdfcontentbyte.moveto(           element.getx() + getoffsetx() + leftoffset,           jasperprint.getpageheight() - element.gety() - getoffsety() + topoffset           );         pdfcontentbyte.lineto(           element.getx() + getoffsetx() + leftoffset,           jasperprint.getpageheight() - element.gety() - getoffsety() - element.getheight() - bottomoffset           );         pdfcontentbyte.stroke();       }     }   }     /**    *    */   protected void exportbottompen(jrpen leftpen, jrpen bottompen, jrpen rightpen, jrprintelement element)   {     if (bottompen.getlinewidth().floatvalue() > 0f)     {       float leftoffset = 0; //leftpen.getlinewidth().floatvalue() / 2 - borderoffset.getoffset(leftpen);       float rightoffset = 0; //rightpen.getlinewidth().floatvalue() / 2 - borderoffset.getoffset(rightpen);        preparepen(pdfcontentbyte, bottompen, pdfcontentbyte.line_cap_butt);        if (bottompen.getlinestylevalue() == linestyleenum.double)       {         float bottomoffset = bottompen.getlinewidth().floatvalue();          pdfcontentbyte.moveto(           element.getx() + getoffsetx() - leftoffset,           jasperprint.getpageheight() - element.gety() - getoffsety() - element.getheight() - bottomoffset / 3           );         pdfcontentbyte.lineto(           element.getx() + getoffsetx() + element.getwidth() + rightoffset,           jasperprint.getpageheight() - element.gety() - getoffsety() - element.getheight() - bottomoffset / 3           );         pdfcontentbyte.stroke();          pdfcontentbyte.moveto(           element.getx() + getoffsetx() + leftoffset / 3,           jasperprint.getpageheight() - element.gety() - getoffsety() - element.getheight() + bottomoffset / 3           );         pdfcontentbyte.lineto(           element.getx() + getoffsetx() + element.getwidth() - rightoffset / 3,           jasperprint.getpageheight() - element.gety() - getoffsety() - element.getheight() + bottomoffset / 3           );         pdfcontentbyte.stroke();       }       else       {         float bottomoffset =  borderoffset.getoffset(bottompen);         pdfcontentbyte.moveto(           element.getx() + getoffsetx() - leftoffset,           jasperprint.getpageheight() - element.gety() - getoffsety() - element.getheight() + bottomoffset           );         pdfcontentbyte.lineto(           element.getx() + getoffsetx() + element.getwidth() + rightoffset,           jasperprint.getpageheight() - element.gety() - getoffsety() - element.getheight() + bottomoffset           );         pdfcontentbyte.stroke();       }     }   }     /**    *    */   protected void exportrightpen(jrpen toppen, jrpen bottompen, jrpen rightpen, jrprintelement element)   {     if (rightpen.getlinewidth().floatvalue() > 0f)     {       float topoffset = 0; //toppen.getlinewidth().floatvalue() / 2 - borderoffset.getoffset(toppen);       float bottomoffset = 0; //bottompen.getlinewidth().floatvalue() / 2 - borderoffset.getoffset(bottompen);        preparepen(pdfcontentbyte, rightpen, pdfcontentbyte.line_cap_butt);        if (rightpen.getlinestylevalue() == linestyleenum.double)       {         float rightoffset = rightpen.getlinewidth().floatvalue();          pdfcontentbyte.moveto(           element.getx() + getoffsetx() + element.getwidth() + rightoffset / 3,           jasperprint.getpageheight() - element.gety() - getoffsety() + topoffset           );         pdfcontentbyte.lineto(           element.getx() + getoffsetx() + element.getwidth() + rightoffset / 3,           jasperprint.getpageheight() - element.gety() - getoffsety() - element.getheight() - bottomoffset           );         pdfcontentbyte.stroke();          pdfcontentbyte.moveto(           element.getx() + getoffsetx() + element.getwidth() - rightoffset / 3,           jasperprint.getpageheight() - element.gety() - getoffsety() - topoffset / 3           );         pdfcontentbyte.lineto(           element.getx() + getoffsetx() + element.getwidth() - rightoffset / 3,           jasperprint.getpageheight() - element.gety() - getoffsety() - element.getheight() + bottomoffset / 3           );         pdfcontentbyte.stroke();       }       else       {         float rightoffset =  borderoffset.getoffset(rightpen);         pdfcontentbyte.moveto(           element.getx() + getoffsetx() + element.getwidth() - rightoffset,           jasperprint.getpageheight() - element.gety() - getoffsety() + topoffset           );         pdfcontentbyte.lineto(           element.getx() + getoffsetx() + element.getwidth() - rightoffset,           jasperprint.getpageheight() - element.gety() - getoffsety() - element.getheight() - bottomoffset           );         pdfcontentbyte.stroke();       }     }   }    private static void preparepen(pdfcontentbyte pdfcontentbyte, jrpen pen, int linecap)   {     float linewidth = pen.getlinewidth().floatvalue();      if (linewidth <= 0)     {       return;     }      pdfcontentbyte.setlinewidth(linewidth);     pdfcontentbyte.setlinecap(linecap);      color color = pen.getlinecolor();     pdfcontentbyte.setrgbcolorstroke(color.getred(), color.getgreen(), color.getblue());      switch (pen.getlinestylevalue())     {       case double:       {         pdfcontentbyte.setlinewidth(linewidth / 3);         pdfcontentbyte.setlinedash(0f);         break;       }       case dotted:       {         switch (linecap)         {           case pdfcontentbyte.line_cap_butt:           {             pdfcontentbyte.setlinedash(linewidth, linewidth, 0f);             break;           }           case pdfcontentbyte.line_cap_projecting_square:           {             pdfcontentbyte.setlinedash(0, 2 * linewidth, 0f);             break;           }         }         break;       }       case dashed:       {         switch (linecap)         {           case pdfcontentbyte.line_cap_butt:           {             pdfcontentbyte.setlinedash(5 * linewidth, 3 * linewidth, 0f);             break;           }           case pdfcontentbyte.line_cap_projecting_square:           {             pdfcontentbyte.setlinedash(4 * linewidth, 4 * linewidth, 0f);             break;           }         }         break;       }       case solid:       default:       {         pdfcontentbyte.setlinedash(0f);         break;       }     }   } }

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