PHP 5.4.31 Released

imagedashedline

(PHP 4, PHP 5)

imagedashedlineDessine une ligne pointillée

Description

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

imagedashedline() est obsolète. Utilisez plutôt une combinaison des fonctions imagesetstyle() et imageline().

Liste de paramètres

image

Une ressource d'image, retournée par une des fonctions de création d'images, comme imagecreatetruecolor().

x1

Coordonnée en X : En haut, à gauche.

y1

Coordonnée en Y : En haut, à gauche. 0 est le coin en haut à gauche de l'image.

x2

Coordonnée en X : En bas, à droite.

y2

Coordonnée en Y : En bas, à droite.

color

La couleur de remplissage. Un identifiant de couleur retourné par la fonction imagecolorallocate().

Valeurs de retour

Retourne toujours TRUE.

Exemples

Exemple #1 Exemple avec imagedashedline()

<?php
// Crée une image de 100x100 pixels
$im imagecreatetruecolor(100100);
$white imagecolorallocate($im0xFF0xFF0xFF);

// Dessine une ligne verticale en pointillé
imagedashedline($im50255075$white);

// Sauvegarde l'image
imagepng($im'./dashedline.png');
imagedestroy($im);
?>

L'exemple ci-dessus va afficher quelque chose de similaire à :

Affichage de l'exemple : imagedashedline()

Exemple #2 Alternative à la fonction imagedashedline()

<?php
// Crée une image de 100x100 pixels
$im imagecreatetruecolor(100100);
$white imagecolorallocate($im0xFF0xFF0xFF);

// Définit le style : Les 4 premiers pixels sont blancs et les 4 suivants
// sont transparents. Ceci va créer l'effet de pointillé
$style = Array(
                
$white,
                
$white,
                
$white,
                
$white,
                
IMG_COLOR_TRANSPARENT,
                
IMG_COLOR_TRANSPARENT,
                
IMG_COLOR_TRANSPARENT,
                
IMG_COLOR_TRANSPARENT
                
);

imagesetstyle($im$style);

// Dessine la ligne pointillée
imageline($im50255075IMG_COLOR_STYLED);

// Sauvegarde de l'image
imagepng($im'./imageline.png');
imagedestroy($im);
?>

Voir aussi

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User Contributed Notes 5 notes

up
1
alien-scripts.de
9 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
0
ProfessorNeo at gmx dot de
8 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
michi at marel dot at
10 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);
}
?>
up
-1
ihsanduvac at gmail dot com
1 year ago
It doesn't work for horizontal lines. Use imagesetstyle()
up
-1
tgabor72 at freemail dot hu
3 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);
      }
   }
}
?>
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