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:

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:

imagesetstyle() - Set the style for line drawing
imageline() - Draw a line

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User Contributed Notes 5 notes

down

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);

      }

   }

}

?>

down

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!

down

ihsanduvac at gmail dot com ¶

12 years ago

It doesn't work for horizontal lines. Use imagesetstyle()

down

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 :)

down

-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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