PHP Unconference Europe 2015

imagedashedline

(PHP 4, PHP 5)

imagedashedline画一虚线

说明

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

反对使用本函数。应该用 imagesetstyle()imageline() 的组合替代之。

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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
2 years ago
It doesn't work for horizontal lines. Use imagesetstyle()
up
-1
tgabor72 at freemail dot hu
4 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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