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    imagedashedline

    (PHP 4, PHP 5, PHP 7, PHP 8)

    imagedashedline — Draw a dashed line

    Descrizione

    imagedashedline(
        GdImage $image,
        int $x1,
        int $y1,
        int $x2,
        int $y2,
        int $color
    ): bool

    This function is deprecated. Use combination of imagesetstyle() and imageline() instead.

    Elenco dei parametri

    image

    Una risorsa immagine, restituita da una delle funzioni di creazione immagine, come imagecreatetruecolor().

    x1

    Upper left x coordinate.

    y1

    Upper left y coordinate 0, 0 is the top left corner of the image.

    x2

    Bottom right x coordinate.

    y2

    Bottom right y coordinate.

    color

    The fill color. A color identifier created with imagecolorallocate().

    Valori restituiti

    Restituisce true in caso di successo, false in caso di fallimento.

    Log delle modifiche

    Versione Descrizione
    8.0.0 image expects a GdImage instance now; previously, a valid gd resource was expected.

    Esempi

    Example #1 imagedashedline() example

    <?php
    // Create a 100x100 image
    $im = imagecreatetruecolor(100, 100);
    $white = imagecolorallocate($im, 0xFF, 0xFF, 0xFF);

    // Draw a vertical dashed line
    imagedashedline($im, 50, 25, 50, 75, $white);

    // Save the image
    imagepng($im, './dashedline.png');
    imagedestroy($im);
    ?>

    Il precedente esempio visualizzerà qualcosa simile a:

    Output of example : imagedashedline()

    Example #2 Alternative to imagedashedline()

    <?php
    // Create a 100x100 image
    $im = imagecreatetruecolor(100, 100);
    $white = imagecolorallocate($im, 0xFF, 0xFF, 0xFF);

    // Define our style: First 4 pixels is white and the
    // next 4 is transparent. This creates the dashed line effect
    $style = Array(
    $white,
    $white,
    $white,
    $white,
    IMG_COLOR_TRANSPARENT,
    IMG_COLOR_TRANSPARENT,
    IMG_COLOR_TRANSPARENT,
    IMG_COLOR_TRANSPARENT
    );

    imagesetstyle($im, $style);

    // Draw the dashed line
    imageline($im, 50, 25, 50, 75, IMG_COLOR_STYLED);

    // Save the image
    imagepng($im, './imageline.png');
    imagedestroy($im);
    ?>

    Vedere anche:

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    User Contributed Notes 5 notes

    up
    1
    tgabor72 at freemail dot hu
    14 years ago
    You can use the imagepatternedline() function with extra features instead of imagedashedline() to give a visible dashedlines and other any kind of patterned lines on your images. The routine also manages the thickness of the line. Have fun!

    <?php
    // imagepatternedline() function
    // Routine was developed to draw any kind of straight line with thickness. Routine uses imageline() function to draw line.
    // Parameters are (similar to imageline() function):
    //   $image: (resource) imagefile
    //   $xstart, $ystart: (int) x,y coordinates for first point
    //   $xend, $yend: (int) x,y coordinates for last point
    //   $color: (int) color identifier that created with imagecolorallocate()
    // extra parameters:
    //   $thickness: (int) thickness of line in pixel
    //   $pattern: (string) pattern of line, which repeats continuously while line is being drawed.
    //   If there is '1' in the pattern that means the actual dot of line is visible,
    //   '0' means dot is not visible (space between two line elements).
    //   All characters regard for one pixel. Default: 1 dot wide dashed line with 4-4 dots and spaces.
    // Examples for pattern:
    // "1" or "" continuous line
    // "10" close dotline
    // "10000" dotline
    // "111111110000001100000011111111" dotline for design drawing
    // "111111111100000011000000110000001111111111" double dotline
    // some examples for using imagepatternedline():
    // imagepatternedline($image,300,300,442,442,$color,200,""); // a square with 200 length of edge and rotated 45 degrees
    // imagepatternedline($image,100,200,289,200,$color,100,
    //  "11001100000011001111000011001111110000001100001100"
    // ."00001111001100111100000011000000110000110011001100"
    // ."11000011111100111111000011001111001111000011110000"
    // ."1111001111110011000011000000001100110011"); // barcode

    function imagepatternedline($image, $xstart, $ystart, $xend, $yend, $color, $thickness=1, $pattern="11000011") {
           $pattern=(!strlen($pattern)) ? "1" : $pattern;
           $x=$xend-$xstart;
           $y=$yend-$ystart;
           $length=floor(sqrt(pow(($x),2)+pow(($y),2)));
           $fullpattern=$pattern;
       while (    strlen($fullpattern)<$length) $fullpattern.=$pattern;
       if (!    $length) {
          if (    $fullpattern[0]) imagefilledellipse($image, $xstart, $ystart, $thickness, $thickness, $color);
          return;
       }
           $x1=$xstart;
           $y1=$ystart;
           $x2=$x1;
           $y2=$y1;
           $mx=$x/$length;
           $my=$y/$length;
           $line="";
       for(    $i=0;$i<$length;$i++){
          if (    strlen($line)==0 or $fullpattern[$i]==$line[0]) {
                 $line.=$fullpattern[$i];
          }else{
                 $x2+=strlen($line)*$mx;
                 $y2+=strlen($line)*$my;
             if (    $line[0]) imageline($image, round($x1), round($y1), round($x2-$mx), round($y2-$my), $color);
                 $k=1;
             for(    $j=0;$j<$thickness-1;$j++) {
                    $k1=-(($k-0.5)*$my)*(floor($j*0.5)+1)*2;
                    $k2= (($k-0.5)*$mx)*(floor($j*0.5)+1)*2;
                    $k=1-$k;
                if (    $line[0]) {
                       imageline($image, round($x1)+$k1, round($y1)+$k2, round($x2-$mx)+$k1, round($y2-$my)+$k2, $color);
                   if (    $y) imageline($image, round($x1)+$k1+1, round($y1)+$k2, round($x2-$mx)+$k1+1, round($y2-$my)+$k2, $color);
                   if (    $x) imageline($image, round($x1)+$k1, round($y1)+$k2+1, round($x2-$mx)+$k1, round($y2-$my)+$k2+1, $color);
                }
             }
                 $x1=$x2;
                 $y1=$y2;
                 $line=$fullpattern[$i];
          }
       }
           $x2+=strlen($line)*$mx;
           $y2+=strlen($line)*$my;
       if (    $line[0]) imageline($image, round($x1), round($y1), round($xend), round($yend), $color);
           $k=1;
       for(    $j=0;$j<$thickness-1;$j++) {
              $k1=-(($k-0.5)*$my)*(floor($j*0.5)+1)*2;
              $k2= (($k-0.5)*$mx)*(floor($j*0.5)+1)*2;
              $k=1-$k;
          if (    $line[0]) {
                 imageline($image, round($x1)+$k1, round($y1)+$k2, round($xend)+$k1, round($yend)+$k2, $color);
             if (    $y) imageline($image, round($x1)+$k1+1, round($y1)+$k2, round($xend)+$k1+1, round($yend)+$k2, $color);
             if (    $x) imageline($image, round($x1)+$k1, round($y1)+$k2+1, round($xend)+$k1, round($yend)+$k2+1, $color);
          }
       }
    }
    ?>
    up
    0
    ihsanduvac at gmail dot com
    12 years ago
    It doesn't work for horizontal lines. Use imagesetstyle()
    up
    0
    ProfessorNeo at gmx dot de
    18 years ago
    The bug reported by 'michi at marel dot at' also exists in PHP version 5.1.1. This functions just works with vertical lines!
    up
    0
    alien-scripts.de
    19 years ago
    I make my own dashedline:

    <?
    for($l=50;$l<=550;$l+=5)
       {
        if(    $da == 0) { $da = 1; }
        elseif(    $da == 1){
            imageline($bild,$l,50,$l+5,50,$green);
            $da = 0; }
       }
    ?>

    $l is the x-value
    and we have a dashed line :)
    up
    -1
    michi at marel dot at
    20 years ago
    There's a bug till PHP 4.0.4 in this function. You can only draw vertical dashed lines. To draw other dashed lines you can set <ImageSetStyle> to a special dashed line and draw it by <ImageLine>.

    Sample code:
    <?php
    function MDashedLine($image, $x0, $y0, $x1, $y1, $fg, $bg)
    {
                $st = array($fg, $fg, $fg, $fg, $bg, $bg, $bg, $bg);
                ImageSetStyle($image, $st);
                ImageLine($image, $x0, $y0, $x1, $y1, IMG_COLOR_STYLED);
    }
    ?>
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