imageloadfont

Last updated: Fri, 22 Aug 2008

imageline

(PHP 4, PHP 5)

imageline — Draw a line

Description

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

imageline() draws a line between the two given points.

Parameters

image: An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().
x1: x-coordinate for first point.
y1: y-coordinate for first point.
x2: x-coordinate for second point.
y2: y-coordinate for second point.
color: The line color. A color identifier created with imagecolorallocate().

Return Values

Returns TRUE on success or FALSE on failure.

Examples

Example #1 Drawing a thick line


<?php

function imagelinethick($image, $x1, $y1, $x2, $y2, $color, $thick = 1)
{
    /* this way it works well only for orthogonal lines
    imagesetthickness($image, $thick);
    return imageline($image, $x1, $y1, $x2, $y2, $color);
    */
    if ($thick == 1) {
        return imageline($image, $x1, $y1, $x2, $y2, $color);
    }
    $t = $thick / 2 - 0.5;
    if ($x1 == $x2 || $y1 == $y2) {
        return imagefilledrectangle($image, round(min($x1, $x2) - $t), round(min($y1, $y2) - $t), round(max($x1, $x2) + $t), round(max($y1, $y2) + $t), $color);
    }
    $k = ($y2 - $y1) / ($x2 - $x1); //y = kx + q
    $a = $t / sqrt(1 + pow($k, 2));
    $points = array(
        round($x1 - (1+$k)*$a), round($y1 + (1-$k)*$a),
        round($x1 - (1-$k)*$a), round($y1 - (1+$k)*$a),
        round($x2 + (1+$k)*$a), round($y2 - (1-$k)*$a),
        round($x2 + (1-$k)*$a), round($y2 + (1+$k)*$a),
    );
    imagefilledpolygon($image, $points, 4, $color);
    return imagepolygon($image, $points, 4, $color);
}

?>


An example to draw Lissajous Curve (http://en.wikipedia.org/wiki/Lissajous_curve):

x = a1 * cos(t/T1);

y = a2 * sin(t/T2);



You can easily modify the codes to create your own oscilloscope application!



<?php

header ("Content-type: image/png");



$T1 = 20;

$T2 = 30;



$myImage = @imagecreatetruecolor(640, 480)

      or die("Cannot Initialize new GD image stream");

$text_color = imagecolorallocate($myImage, 255, 255, 224);

$poly_color = imagecolorallocate($myImage, 124, 120, 224);



//calculate x-value and y-value point by point

$points = array();

for ($i=0; $i<1000; $i=$i+1)

{

    //define curve's function

    $x = 310*cos($i/$T1); //define x-value

    $y = 230*sin($i/$T2);//define y-value

    

    //move the coordinate, append a point's x-value and y-value

    $points[] = 320+$x; //x-value

    $points[] = 240-$y;  //y-value

}



//count points

$totalPoints = count($points)/2;



//drawing title

$title = "Final Plot ($totalPoints points)";

imagestring($myImage, 3, 5, 5,  $title, $text_color);



/** drawing points one by one, notice if there 

 * are 10 points, we need to draw 9 lines: 

 * 1) point 0 to 1; 

 * 2) point 1 to 2;

 * ...

 * ...

 * 9) point 8 to 9; 

 */

for ($i=0; $i<$totalPoints-1; $i++)

{

    imageLine($myImage, $points[2*$i], $points[1+2*$i], $points[2+2*$i], $points[3+2*$i], $poly_color);    

}



//finalizing

imagepng($myImage);

imagedestroy($myImage);

?>

huirong dot jin at gmail dot com
31-Jan-2008 10:57


An example to draw Amplitude Modulation curve: y = c * sin (x/a) * sin (x/b) . You can easily modify the codes to create your own oscilloscope application!



<?php

header ("Content-type: image/png");

$myImage = @imagecreatetruecolor(640, 480)

      or die("Cannot Initialize new GD image stream");

$text_color = imagecolorallocate($myImage, 255, 255, 224);

$poly_color = imagecolorallocate($myImage, 124, 120, 224);



//calculate x-value and y-value point by point

$points = array();

for ($i=1; $i<640; $i=$i+1)

{

    //define curve's function

    $x = $i; //define x-value, which is $i itself 

    $y = 150*sin($x/80)*sin($x/5);//define y-value

    

    //append a point's x-value and y-value

    $points[] = $x; //x-value

    $points[] = 240-$y;  //y-value

}



//count points

$totalPoints = count($points)/2;



//drawing title

$title = "Final Plot ($totalPoints points)";

imagestring($myImage, 3, 5, 5,  $title, $text_color);



/** drawing points one by one, notice if there 

 * are 10 points, we need to draw 9 lines: 

 * 1) point 0 to 1; 

 * 2) point 1 to 2;

 * ...

 * ...

 * 9) point 8 to 9; 

 */

for ($i=0; $i<$totalPoints-1; $i++)

{

    imageLine($myImage, $points[2*$i], $points[1+2*$i], $points[2+2*$i], $points[3+2*$i], $poly_color);    

}



//finalizing

imagepng($myImage);

imagedestroy($myImage);

?>

admin at xpmail dot net
01-May-2007 02:45


example of a Simple grid...

bool imagegrid ( resource $image, int $width, int $Height, int $size, mixed $color )



<?php

Header("Content-type: image/png");

$Width=450;

$Height=450;



$img = ImageCreateTrueColor($Width, $Height);



$bg = imagecolorallocate($img, 255, 255, 255);

imagefill($img, 0, 0, $bg);



$grid = imagecolorallocate($img, 225, 245, 249);



imagesetstyle($img, array($bg, $grid));

imagegrid($img, $Width, $Height, 10, IMG_COLOR_STYLED);

//makegrid($img, $Width, $Height, 10, $grid);



ImagePNG($img);

ImageDestroy($img);



function imagegrid($image, $w, $h, $s, $color)

{

    for($iw=1; $iw<$w/$s; $iw++){imageline($image, $iw*$s, 0, $iw*$s, $w, $color);}

    for($ih=1; $ih<$h/$s; $ih++){imageline($image, 0, $ih*$s, $w, $ih*$s, $color);}

}

?>

Jonathan W.
27-Apr-2007 10:15


I've modified the previous entry for drawing on a polar coordinate system to better represent angles based on a 360º whole circle bearing.



<?php



function imagepolarline($image,$x1,$y1,$length,$angle,$color)

{

    $x2 = $x1 + sin( deg2rad($angle) ) * $length;

    $y2 = $y1 + cos( deg2rad($angle+180) ) * $length;



    imageline($image,$x1,$y1,$x2,$y2,$color);

}



?>

Ian B
07-Nov-2006 12:59


Here's a function to plot a line on a polar coordinate system:



<?php



function imagepolarline($image,$x1,$y1,$length,$angle,$color)

{

    $x2 = $x1 + sin( deg2rad($angle+90) ) * $length;

    $y2 = $y1 + cos( deg2rad($angle+90) ) * $length;



    imageline($image,$x1,$y1,$x2,$y2,$color);

}



?>



x1,y1 are the coordinates for the central point. If you want the orientation to be like a compass i.e. 90 degrees = East, 180 = South etc, then use the following:



$x2 = $x1 + cos( deg2rad($angle-90)) * $length;

$y2 = $y1 + sin( deg2rad($angle-90)) * $length;

pb_2001 at haefft dot de
04-Mar-2006 11:41


This is a function to make a dotted line. It accepts (it actually requires) 7 parameters and returns 1 if everything went OK and 0 if there was a problem.



int imagelinedotted ( resource im, int x1, int y1, int x2, int y2, int dist, int col )



imagelinedotted() draws a line from x1, y1 to x2, y2 (top left is 0, 0) in image im of colour col where dist defines the distance (measured in pixels) between one dot and another.



<?php

function imagelinedotted ($im, $x1, $y1, $x2, $y2, $dist, $col) {

    $transp = imagecolortransparent ($im);

    

    $style = array ($col);

    

    for ($i=0; $i<$dist; $i++) {

        array_push($style, $transp);        // Generate style array - loop needed for customisable distance between the dots

    }

    

    imagesetstyle ($im, $style);

    return (integer) imageline ($im, $x1, $y1, $x2, $y2, IMG_COLOR_STYLED);

    imagesetstyle ($im, array($col));        // Reset style - just in case...

}

?>

fatpratmatt at gmail dot com
30-Jan-2006 08:43


Here is a function which draws lines that cross at a specific point [It may need some tweaking]:



<?php

// Image Cross by Matt Evans

// $im - image resource

// $x - x coordinate where the lines should cross

// $y - y coordinate where the lines should cross

// $size - the length of each line

// $colour - the colour of the cross



function imagecross($im, $x, $y, $size = 5, $colour) {

imageline($im, $x+$size/2, $y+$size/2, $x-$size/2, $y-$size/2, $colour);

imageline($im, $x-$size/2, $y+$size, $x+$size/2, $y-$size, $colour);

}



// Example

imagecross($im, 50, 50, 5, $crosscolour);

?>

21-Oct-2005 04:30


imageline coordinate variables are documented as int ,  a value in decimal format will be truncated.



This may be useful when, for example, applying a non-integer scaling factor in generating an image.



Care should be taken to ensure this does not create significant errors that affect the quality of the image. For example :



<?php

$x=0.00000000001;$y=100;

imageline($img,0,0,0,$y+$x);

imageline($img,0,0,0,$y-$x);

?>



the first line will be straight , the second will have a step. Use round() where appropriate.

meid at gmx dot at
07-Sep-2005 07:39


Some simple code to draw lines with specific thickness using "imagefilledpolygon". Useful if your gdlib does not support "imagesetthickness". 



<?

function dickelinie($img,$start_x,$start_y,$end_x,$end_y,$color,$thickness) 

{

    $angle=(atan2(($start_y - $end_y),($end_x - $start_x))); 



    $dist_x=$thickness*(sin($angle));

    $dist_y=$thickness*(cos($angle));

    

    $p1x=ceil(($start_x + $dist_x));

    $p1y=ceil(($start_y + $dist_y));

    $p2x=ceil(($end_x + $dist_x));

    $p2y=ceil(($end_y + $dist_y));

    $p3x=ceil(($end_x - $dist_x));

    $p3y=ceil(($end_y - $dist_y));

    $p4x=ceil(($start_x - $dist_x));

    $p4y=ceil(($start_y - $dist_y));

    

    $array=array(0=>$p1x,$p1y,$p2x,$p2y,$p3x,$p3y,$p4x,$p4y);

    imagefilledpolygon ( $img, $array, (count($array)/2), $color );

}

// Example:

header ("Content-type: image/jpeg");

$img = ImageCreate (210, 210) or die("Cannot Initialize new GD image stream ");

$backgroundcolor = ImageColorAllocate ($img, 255, 255, 255);

$orange = ImageColorAllocate($img, 252, 102, 4);

dickelinie($img, 10, 10, 10, 200,$orange,2);

dickelinie($img, 10, 200, 200, 10,$orange,2);    

dickelinie($img, 200, 10, 200, 200,$orange,2);

imagejpeg($img);   

ImageDestroy($img);



?>

d [AT] sprid [DOT] de
06-Sep-2005 12:12


Here my function do clear all problems. With this, you can draw firstly smooth lines (basic code adapted from code_couturier at graffiti dot net, with some performance changes). The special is, you can define the alpha-value of the line (0 = normal smooth line, 127 = fully transparent). Change whatever you want to make it better, but post your results ;) 



<?php

/**

 * function imageSmoothAlphaLine() - version 1.0

 * Draws a smooth line with alpha-functionality

 *

 * @param   ident    the image to draw on

 * @param   integer  x1

 * @param   integer  y1

 * @param   integer  x2

 * @param   integer  y2

 * @param   integer  red (0 to 255)

 * @param   integer  green (0 to 255)

 * @param   integer  blue (0 to 255)

 * @param   integer  alpha (0 to 127)

 *

 * @access  public

 *

 * @author  DASPRiD <d@sprid.de>

 */

function imageSmoothAlphaLine ($image, $x1, $y1, $x2, $y2, $r, $g, $b, $alpha=0) {

  $icr = $r;

  $icg = $g;

  $icb = $b;

  $dcol = imagecolorallocatealpha($image, $icr, $icg, $icb, $alpha);

  

  if ($y1 == $y2 || $x1 == $x2) 

    imageline($image, $x1, $y2, $x1, $y2, $dcol);

  else {

    $m = ($y2 - $y1) / ($x2 - $x1);

    $b = $y1 - $m * $x1;



    if (abs ($m) <2) {

      $x = min($x1, $x2);

      $endx = max($x1, $x2) + 1;



      while ($x < $endx) {

        $y = $m * $x + $b;

        $ya = ($y == floor($y) ? 1: $y - floor($y));

        $yb = ceil($y) - $y;

   

        $trgb = ImageColorAt($image, $x, floor($y));

        $tcr = ($trgb >> 16) & 0xFF;

        $tcg = ($trgb >> 8) & 0xFF;

        $tcb = $trgb & 0xFF;

        imagesetpixel($image, $x, floor($y), imagecolorallocatealpha($image, ($tcr * $ya + $icr * $yb), ($tcg * $ya + $icg * $yb), ($tcb * $ya + $icb * $yb), $alpha));

  

        $trgb = ImageColorAt($image, $x, ceil($y));

        $tcr = ($trgb >> 16) & 0xFF;

        $tcg = ($trgb >> 8) & 0xFF;

        $tcb = $trgb & 0xFF;

        imagesetpixel($image, $x, ceil($y), imagecolorallocatealpha($image, ($tcr * $yb + $icr * $ya), ($tcg * $yb + $icg * $ya), ($tcb * $yb + $icb * $ya), $alpha));

  

        $x++;

      }

    } else {

      $y = min($y1, $y2);

      $endy = max($y1, $y2) + 1;



      while ($y < $endy) {

        $x = ($y - $b) / $m;

        $xa = ($x == floor($x) ? 1: $x - floor($x));

        $xb = ceil($x) - $x;

  

        $trgb = ImageColorAt($image, floor($x), $y);

        $tcr = ($trgb >> 16) & 0xFF;

        $tcg = ($trgb >> 8) & 0xFF;

        $tcb = $trgb & 0xFF;

        imagesetpixel($image, floor($x), $y, imagecolorallocatealpha($image, ($tcr * $xa + $icr * $xb), ($tcg * $xa + $icg * $xb), ($tcb * $xa + $icb * $xb), $alpha));

  

        $trgb = ImageColorAt($image, ceil($x), $y);

        $tcr = ($trgb >> 16) & 0xFF;

        $tcg = ($trgb >> 8) & 0xFF;

        $tcb = $trgb & 0xFF;

        imagesetpixel ($image, ceil($x), $y, imagecolorallocatealpha($image, ($tcr * $xb + $icr * $xa), ($tcg * $xb + $icg * $xa), ($tcb * $xb + $icb * $xa), $alpha));

  

        $y ++;

      }

    }

  }

} // end of 'imageSmoothAlphaLine()' function

?>

Tyron
02-May-2005 08:50


// Here's a function for drawing a rotated gradient Rectangle (based on a previous note)



// Create An Image 255x255

$img = ImageCreateTrueColor(255, 255);



GradientRect($img,50,50,80,80,30);



ImagePng($img,"test.png");

ImageDestroy($img);

echo "<br><img src=\"test.png\">";



function GradientRect($img, $x1, $y1, $x2, $y2, $wdt) {

  $alpha = atan2($y2-$y1,$x2-$x1);

  $real_wdt = $wdt*sin($alpha);

  $real_hgt = $wdt*cos($alpha);

  echo "real wdt:".$real_wdt;

  echo "<br>real hgt:".$real_hgt;

  echo "<br>angle: ".($angle*180/pi());

  $plotD = 0;

  $i=0; 



  $dy = $real_hgt/$wdt;

  $dx = $real_wdt/$wdt;

  $drgb= 256/$wdt;

  while($i++ < $wdt) {

    // Draw a line and move it down and make it lighter to get the gradient effect

    ImageLine($img, $x1-$i*$dx, $y1+$i*$dy, $x2-$i*$dx, $y2+$i*$dy, ImageColorAllocate($img, $i*$drgb, 0, 0));

    ImageLine($img, $x1-$i*$dx+1, $y1+$i*$dy, $x2-$i*$dx+1, $y2+$i*$dy, ImageColorAllocate($img, $i*$drgb, 0, 0));



  }

}

ajreading at classixshop dot com
23-Apr-2005 04:28


<?php

// An easy bit of code showing how you can use the ImageLine() function to create gradients



// Create An Image 255x255

$img = ImageCreateTrueColor(255, 255);



$plotD = 0;

while($plotD < 256)

{

    // Draw a line and move it down and make it lighter to get the gradient effect

    ImageLine($img, 0, $plotD , 255, $plotD, ImageColorAllocate($img, $plotD, $plotD, $plotD));

    $plotD++;

}

Header("Content-type: image/png");

ImagePng($img);

ImageDestroy($img);

?>

eviloverlord at gmail dot com
27-Jan-2005 04:50


This code is used to draw a board of hexagons (for games, classes, etc.)



<?php

//Draws a hexagonal board



// User-defined values

$maxTiles = 7;                    //The number of tiles at the center (widest part) of the board

$minTiles = 4;                    //The number of tiles at the edges of the board

$side = 30;                        //The length of the sides of the tiles in pixels

$bgColor = array(0, 0, 0);        //The background color in RGB format

$fgColor = array(255, 255, 255);//The foreground color in RGB format



//Calculated values

$widthInTiles = range($maxTiles, $minTiles);            //In our example: 7, 6, 5, 4

$rowsInTiles = count($widthInTiles)*2-1;                //the total number of rows on our board

$xSide = $side*sin(deg2rad(60));                        //the length of the x-part of the angled sides

$ySide = $side*sin(deg2rad(30));                        //the length of the y-part of the angled sides

$boardWidth = $xSide*$widthInTiles[0]*2;                //The entire width of the board

$boardHeight = $rowsInTiles*($side + $ySide) + $ySide;    //The entire height of the board



// create a blank image and allocate the foreground, background colors

$image = imagecreate($boardWidth, $boardHeight);

$bg = imagecolorallocate($image, $bgColor[0], $bgColor[1], $bgColor[2]);

$fg = imagecolorallocate($image, $fgColor[0], $fgColor[1], $fgColor[2]);



// draw the board

$row = 0;

foreach($widthInTiles as $tiles)

{

    for ($i = 0; $i < $tiles+1; $i++)

    {

        $x1 = $row*$xSide + $i*$xSide*2;

        $y1 = $boardHeight/2;

        $y1Dif = ($side/2) + $row*($side+$ySide);



        $x2 = $x1 + $xSide;

        $y2 = $y1;

        $y2Dif = $ySide;



        $x3 = $x2 + $xSide;



        if ($i < $tiles)

        {

            imageline($image, $x1, $y1 - $y1Dif, $x2, $y2 - $y1Dif - $y2Dif, $fg);

            imageline($image,  $x1, $y1 + $y1Dif, $x2, $y2 + $y1Dif + $y2Dif, $fg);

            imageline($image, $x2, $y2 - $y1Dif - $y2Dif, $x3, $y1 - $y1Dif, $fg);

            imageline($image, $x2, $y2 + $y1Dif + $y2Dif, $x3, $y1 + $y1Dif, $fg);

        }

                

        imageline($image, $x1, $y1 - $y1Dif, $x1, $y1 - $y1Dif + $side, $fg);            

        imageline($image, $x1, $y1 + $y1Dif, $x1, $y1 + $y1Dif - $side, $fg);            

    }

    $row++;

}



// output the picture

header("Content-type: image/png");

imagepng($image);

imagedestroy($image);

?>

likavcan at NOSPAN sturak nospan dot sk
06-Jun-2004 12:56


This function draws arrow.



function arrow($im, $x1, $y1, $x2, $y2, $alength, $awidth, $color) {



    $distance = sqrt(pow($x1 - $x2, 2) + pow($y1 - $y2, 2));



    $dx = $x2 + ($x1 - $x2) * $alength / $distance;

    $dy = $y2 + ($y1 - $y2) * $alength / $distance;



    $k = $awidth / $alength;



    $x2o = $x2 - $dx;

    $y2o = $dy - $y2;



    $x3 = $y2o * $k + $dx;

    $y3 = $x2o * $k + $dy;



    $x4 = $dx - $y2o * $k;

    $y4 = $dy - $x2o * $k;



    imageline($im, $x1, $y1, $dx, $dy, $color);

    imageline($im, $x3, $y3, $x4, $y4, $color);

    imageline($im, $x3, $y3, $x2, $y2, $color);

    imageline($im, $x2, $y2, $x4, $y4, $color);



}

Lionel Van Bemten
23-May-2004 12:41


here is a code to draw a "degraded" ... :

<?

header("Content-type : image/jpeg");



$image = @ImageCreate(200, 100)

  or die ("Erreur de cr�ation de l'image");



$lignes_colorees = 1;

$couleur_fond = ImageColorAllocate($image, 255, 255, 255);



$rouge_depart = 100;

$vert_depart = 255;

$bleu_depart = 0;



$rouge_fin = 0;

$vert_fin = 100;

$bleu_fin = 0;



$lignes = 100; //nb de lignes de l'image



$vert_diff = $vert_fin - $vert_depart;

$vert1 = $vert_diff / $lignes;



$bleu_diff = $bleu_fin - $bleu_depart;

$bleu1 = $bleu_diff / $lignes;



$rouge_diff = $rouge_fin - $rouge_depart;

$rouge1 = $rouge_diff / $lignes;



while ($lignes_colorees <= 100)

{

    $rouge2 = $lignes_colorees * $rouge1;    $rouge3 = $rouge_depart + $rouge2;

    $rouge = round($rouge3);

    

    $vert2 = $lignes_colorees * $vert1;

    $vert3 = $vert_depart + $vert2;

    $vert = round($vert2);

    

    $bleu2 = $lignes_colorees * $bleu1;

    $bleu3 = $bleu_depart + $bleu2;

    $bleu = round($bleu2);

    

    $y1 = $lignes_colorees;

    $y2 = $lignes_colorees;

    $x1 = 1;    $x2 = 200;

    

    $couleur = ImageColorAllocate($image, $rouge, $vert, $bleu);

    //dessine la ligne

    ImageLine($image, $x1, $y1, $x2, $y2, $couleur);    $lignes_colorees ++;

}



//dessine l'image

ImageJpeg($image);

?>

ruturaj_v at yahoo dot com
14-May-2004 05:48


here is a function that helps you create arrows...



<?php

function get_arrowheads ($x1, $y1, $x2, $y2, $arrhead, $arrang) {

    $debug = false;

    

    define("INFINITE", 'INFINITE');

    if (($x2-$x1)==0) {

        if ($y1 == 0) {

            $slope = 0;

        } else {

            $slope = INFINITE;

        }

    } else {

        $slope = -($y2-$y1)/($x2-$x1);

    }



    //$slope = number_format($slope, 2, '.','');

    if ($slope == 'INFINITE') {

        $ang = 90;

    } else {

        $ang = atan ($slope);

        $ang = ($ang * 180)/pi();

    }

    //$ang = number_format($ang, 2, '.', '');

    //echo ($ang);

    //exit;



    //convert the angle

    $arrang1 = ($ang - $arrang);

    $arrangdeg1 = ($ang - $arrang);

    //echo ($arrang1);exit;

    $arrang1 = ($arrang1*pi())/180;



    $arrang2 = ($ang + $arrang);

    $arrangdeg2 = ($ang + $arrang);

    $arrang2 = ($arrang2*pi())/180;

    //echo ($arrang1);



    $arx1 = (floor(cos($arrang1)*$arrhead));

    $ary1 = (floor(sin($arrang1)*$arrhead));

    $arx2 = (floor(cos($arrang2)*$arrhead));

    $ary2 = (floor(sin($arrang2)*$arrhead));

    if ($debug) {

        echo ("Values of arx1.. before add/sub</br>");

        echo ("$arx1,$ary1&nbsp;&nbsp;&nbsp;$arx2,$ary2</br>");

    }

    if ($ang==0) {

        if ($x2 > $x1) {

            $arx1 = $x2 - $arx1;    $ary1 = $y2 - $ary1;

            $arx2 = $x2 - $arx2;    $ary2 = $y2 - $ary2;

        } elseif ($x2 < $x1) {

            $arx1 = $x2 + $arx1;    $ary1 = $y2 - $ary1;

            $arx2 = $x2 + $arx2;    $ary2 = $y2 - $ary2;

        }

    }

    if ($ang > 0 && $ang < 90) {

        if (($x2 > $x1) && ($y2 < $y1)) {

            $arx1 = $x2 - $arx1;    $ary1 = $y2 + $ary1;

            $arx2 = $x2 - $arx2;    $ary2 = $y2 + $ary2;

        } elseif (($x2 < $x1) && ($y2 > $y1)) {

            $arx1 = $x2 + $arx1;    $ary1 = $y2 - $ary1;

            $arx2 =

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Description

Parameters

Return Values

Examples

See Also