imagedashedline

(PHP 4, PHP 5, PHP 7)

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() 和 imageline() 的组合替代之。

用户评论:

[#1] ihsanduvac at gmail dot com [2012-08-17 18:45:35]

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

[#2] tgabor72 at freemail dot hu [2010-08-17 11:50:21]

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); } } } ?>

[#3] ProfessorNeo at gmx dot de [2006-02-16 12:07:15]

The bug reported by 'michi at marel dot at' also exists in PHP version 5.1.1. This functions just works with vertical lines!

[#4] alien-scripts.de [2005-07-13 14:17:22]

I make my own dashedline:

<?php 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 :)

[#5] michi at marel dot at [2003-11-19 06:49:00]

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); } ?>