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imageline (PHP 3, PHP 4, PHP 5) imageline -- Draw a line Descriptionbool imageline ( resource image, int x1, int y1, int x2, int y2, int color )
imageline() draws a line from
x1, y1 to
x2, y2 (top left is
0, 0) in image image of color color.
Пример 1. Drawing a thick line |
<?php
function imagelinethick($image, $x1, $y1, $x2, $y2, $color, $thick = 1)
{
if ($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); $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, $color);
}
?>
|
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See also imagecreatetruecolor() and
imagecolorallocate().
imageline
pb_2001 at haefft dot de
04-Mar-2006 02:41
This is a function to make a dotted line. It accepts (it actually requires) 7 parameters and returns 1 if everything went OK and 0 if there was a problem.
int imagelinedotted ( resource im, int x1, int y1, int x2, int y2, int dist, int col )
imagelinedotted() draws a line from x1, y1 to x2, y2 (top left is 0, 0) in image im of colour col where dist defines the distance (measured in pixels) between one dot and another.
<?php
function imagelinedotted ($im, $x1, $y1, $x2, $y2, $dist, $col) {
$transp = imagecolortransparent ($im);
$style = array ($col);
for ($i=0; $i<$dist; $i++) {
array_push($style, $transp); }
imagesetstyle ($im, $style);
return (integer) imageline ($im, $x1, $y1, $x2, $y2, IMG_COLOR_STYLED);
imagesetstyle ($im, array($col)); }
?>
fatpratmatt at gmail dot com
30-Jan-2006 11:43
Here is a function which draws lines that cross at a specific point [It may need some tweaking]:
<?php
function imagecross($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, $colour);
}
imagecross($im, 50, 50, 5, $crosscolour);
?>
21-Oct-2005 07:30
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 10:39
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 );
}
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 03:12
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 ($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 ++;
}
}
}
} ?>
Tyron
02-May-2005 11:50
// 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 07:28
<?php
$img = ImageCreateTrueColor(255, 255);
$plotD = 0;
while($plotD < 256)
{
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 07:50
This code is used to draw a board of hexagons (for games, classes, etc.)
<?php
$maxTiles = 7; $minTiles = 4; $side = 30; $bgColor = array(0, 0, 0); $fgColor = array(255, 255, 255);$widthInTiles = range($maxTiles, $minTiles); $rowsInTiles = count($widthInTiles)*2-1; $xSide = $side*sin(deg2rad(60)); $ySide = $side*sin(deg2rad(30)); $boardWidth = $xSide*$widthInTiles[0]*2; $boardHeight = $rowsInTiles*($side + $ySide) + $ySide; $image = imagecreate($boardWidth, $boardHeight);
$bg = imagecolorallocate($image, $bgColor[0], $bgColor[1], $bgColor[2]);
$fg = imagecolorallocate($image, $fgColor[0], $fgColor[1], $fgColor[2]);
$row = 0;
foreach($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);
}
$row++;
}
header("Content-type: image/png");
imagepng($image);
imagedestroy($image);
?>
likavcan at NOSPAN sturak nospan dot sk
05-Jun-2004 03:56
This function draws arrow.
function arrow($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
22-May-2004 03:41
here is a code to draw a "degraded" ... :
<?
header("Content-type : image/jpeg");
$image = @ImageCreate(200, 100)
or die ("Erreur de cration 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; $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, $bleu);
ImageLine($image, $x1, $y1, $x2, $y2, $couleur); $lignes_colorees ++;
}
ImageJpeg($image);
?>
ruturaj_v at yahoo dot com
14-May-2004 08:48
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-$x1);
}
if ($slope == 'INFINITE') {
$ang = 90;
} else {
$ang = atan ($slope);
$ang = ($ang * 180)/pi();
}
$arrang1 = ($ang - $arrang);
$arrangdeg1 = ($ang - $arrang);
$arrang1 = ($arrang1*pi())/180;
$arrang2 = ($ang + $arrang);
$arrangdeg2 = ($ang + $arrang);
$arrang2 = ($arrang2*pi())/180;
$arx1 = (floor(cos($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 $arx2,$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 = $x2 + $arx2; $ary2 = $y2 - $ary2;
}
}
if ($ang==90) {
if (($y2 > $y1)) {
$arx1 = $x2 - $arx1; $ary1 = $y2 - $ary1;
$arx2 = $x2 - $arx2; $ary2 = $y2 - $ary2;
} elseif (($y2 < $y1)) {
$arx1 = $x2 - $arx1; $ary1 = $y2 + $ary1;
$arx2 = $x2 - $arx2; $ary2 = $y2 + $ary2;
}
}
if ($ang > -90 && $ang < 0) {
if (($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 = $x2 + $arx2; $ary2 = $y2 - $ary2;
}
}
if ($debug) {
echo ("Angle of line is (".$ang*180/pi().")</br>");
echo ("Angle of line1 is $arrangdeg1</br>");
echo ("Angle of line2 is $arrangdeg2</br>");
echo ("$arx1,$ary1 $x2,$y2</br>");
echo ("$arx2,$ary2 $x2,$y2");
exit;
}
$array_arrows = array (
'x1' =>$arx1,
'y1' => $ary1,
'x2' => $arx2,
'y2' => $ary2
);
return $array_arrows;
}
$x1 = 200; $y1 = 200;
$x2 = 400; $y2 = 100;
$arrhead = 15; $arrang = 10; $ar_arrws = get_arrowheads ($x1, $y1, $x2, $y2, $arrhead, $arrang);
$im = imagecreate (400, 400);
$w = imagecolorallocate ($im, 255, 255, 255);
$red = imagecolorallocate ($im, 255, 0, 0);
imageline ($im, $x1, $y1, $x2, $y2, $green);
imageline ($im, $x1+1, $x2+1, $y1+1, $y2+1, $red);
imageline ($im, $x2, $y2, $ar_arrws['x1'], $ar_arrws['y1'], $green);
imageline ($im, $x2, $y2, $ar_arrws['x2'], $ar_arrws['y2'], $green);
?>
yl at sota dot ch
14-Apr-2004 09:44
Simple function to create border for jpg-images:
function createImageBorder($imgName){
$img = substr($imgName, 0, -4); // remove fileExtension
$ext = ".jpg";
$quality = 95;
$borderColor = 255; // 255 = white
/*
a b
+-------------------------+
|
| IMAGE
|
+-------------------------+
c d
*/
$scr_img = imagecreatefromjpeg($img.$ext);
$width = imagesx($scr_img);
$height = imagesy($scr_img);
// line a - b
$abX = 0;
$abY = 0;
$abX1 = $width;
$abY1 = 0;
// line a - c
$acX = 0;
$acY = 0;
$acX1 = 0;
$acY1 = $height;
// line b - d
$bdX = $width-1;
$bdY = 0;
$bdX1 = $width-1;
$bdY1 = $height;
// line c - d
$cdX = 0;
$cdY = $height-1;
$cdX1 = $width;
$cdY1 = $height-1;
// DRAW LINES
imageline($scr_img,$abX,$abY,$abX1,$abY1,$borderColor);
imageline($scr_img,$acX,$acY,$acX1,$acY1,$borderColor);
imageline($scr_img,$bdX,$bdY,$bdX1,$bdY1,$borderColor);
imageline($scr_img,$cdX,$cdY,$cdX1,$cdY1,$borderColor);
// create copy from image
imagejpeg($scr_img, $img."_border.jpg", $quality);
imagedestroy($scr_img);
}
createImageBorder("myfile.jpg");
XxXoldsaltXxX at hotmail dot com
14-Feb-2004 10:50
Script to draw a grid of lines, which make the entire side of the picture look like a quarter circle.. very cool :)
<?php
$img_disp = imagecreate(1000,1000);
$backcolor = imagecolorallocate($img_disp,0,0,0);
imagefill($img_disp,0,0,$backcolor);
$textcolor = imagecolorallocate($img_disp,255,0,0);
$x1 = 0;
$y1 = 0;
$x2 = 0;
$y2 = 1000;
for(;;){
$y1 = $y1 + 20;
$x2 = $x2 + 20;
imageline($img_disp,$x1,$y1,$x2,$y2,$textcolor);
if ($y1 == 1000){
break;
}
}
header("Content-type: image/png");
imagepng($img_disp); imagedestroy($img_disp); ?>
mueller at inf dot ufsc dot br
05-Jan-2004 12:26
an algorithm to draw a bezier spline
<?php
$segmentos =30;
$x=array(0,10,80,30);
$y=array(0,10,40,50);
function bezier($p,$steps){
$t = 1 / $steps;
$temp = $t * $t;
$ret = array();
$f = $p[0];
$fd = 3 * ($p[1] - $p[0]) * $t;
$fdd_per_2=3*($p[0]-2*$p[1]+$p[2])*$temp;
$fddd_per_2=3*(3*($p[1]-$p[2])+$p[3]-$p[0])*$temp*$t;
$fddd = $fddd_per_2 + $fddd_per_2;
$fdd = $fdd_per_2 + $fdd_per_2;
$fddd_per_6 = $fddd_per_2 * (1.0 / 3);
for ($loop=0; $loop<$steps; $loop++) {
array_push($ret,$f);
$f = $f + $fd + $fdd_per_2 + $fddd_per_6;
$fd = $fd + $fdd + $fddd_per_2;
$fdd = $fdd + $fddd;
$fdd_per_2 = $fdd_per_2 + $fddd_per_2;
}
return $ret;
}
$by = bezier($y,$segmentos);
$bx = bezier($x,$segmentos);
header ("Content-type: image/jpeg");
$tam = 200;
$im = imagecreate($tam,$tam);
$background_color = imagecolorallocate ($im, 200, 200, 200);
$tc = imagecolorallocate ($im, 233, 14, 91);
for($i=0;$i<$segmentos-1;$i++)
imageline($im,$bx[$i],$tam-$by[$i],$bx[$i+1],$tam-$by[$i+1],$tc);
imagejpeg($im);
imagedestroy($im);
?>
code_couturier at graffiti dot net
17-Oct-2003 11:56
# antialiased draw_line function 1.1 (faster)
# here is a drawLine() posted by nanobot at chipx86 dot com
# on php.net and enhanced/optimized by myself :)
# here are some changes i made:
# 1. changed for true-color images (no index_var used)
# 2. changed rgb extraction to logical shift
# 3. reducing function call's
function drawQSLine ($image,$x1,$y1,$x2,$y2,$r,$g,$b) {
$icr=$r;
$icg=$g;
$icb=$b;
$dcol = ImageColorAllocate ($image,$icr,$icg,$icb);
if ($y1 == $y2) imageline ($image,$x1,$y1,$x2,$y1,$dcol);
else if ($x1 == $x2) {
imageline ($image,$x1,$y1,$x1,$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;
$y == floor ($y) ? $ya = 1 : $ya = $y - floor ($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),imagecolorallocate ($image,($tcr * $ya + $icr * $yb),
($tcg * $ya + $icg * $yb),
($tcb * $ya + $icb * $yb)));
$trgb = ImageColorAt($image,$x,ceil($y));
$tcr = ($trgb >> 16) & 0xFF;
$tcg = ($trgb >> 8) & 0xFF;
$tcb = $trgb & 0xFF;
imagesetpixel ($image,$x,ceil ($y),imagecolorallocate ($image,($tcr * $yb + $icr * $ya),
($tcg * $yb + $icg * $ya),
($tcb * $yb + $icb * $ya)));
$x ++;
} # while_x_end
} # if_end
else { # else_abs_end
$y = min ($y1,$y2);
$endy = max ($y1,$y2)+1;
while ($y < $endy) {
$x=($y - $b) / $m;
$x == floor ($x) ? $xa = 1 : $xa = $x - floor ($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,imagecolorallocate ($image,($tcr * $xa + $icr * $xb),
($tcg * $xa + $icg * $xb),
($tcb * $xa + $icb * $xb)));
$trgb = ImageColorAt($image,ceil($x),$y);
$tcr = ($trgb >> 16) & 0xFF;
$tcg = ($trgb >> 8) & 0xFF;
$tcb = $trgb & 0xFF;
imagesetpixel ($image,ceil ($x),$y,imagecolorallocate ($image, ($tcr * $xb + $icr * $xa),
($tcg * $xb + $icg * $xa),
($tcb * $xb + $icb * $xa)));
$y ++;
}# while_y_end
}# else_abs_end
}# else_y=y_x=x_end
}# drawOSLine_end
code_couturier at graffiti dot net
01-Oct-2003 09:33
# antialiased lines with true-type-fonts !?
# yip, it works - not very good - but faster
# (below 3 sec) than other routines (~7 sec)
# i saw here.
# the antialiased effect is minimal and only
# at the top of the line - but, as better as
# nothing ;)
# here is a drawLine routine from Logan Gunthorpe
# (logang at deltatee dot com) posted by nanobot at chipx86 dot com
# on php.net and enhanced/optimized by myself :)
function drawSoftLine ($image, $x1, $y1, $x2, $y2, $r,$g,$b) {
$fontfile="arial.ttf"; # the font for the dot
$str="" ; # the point_char for the dot
$size=12; # the point for the dot_size
$color = ImageColorAllocate ($image, $r,$g,$b);
if ($x2 == $x1) {
$tmp = $x1; $x1 = $y1; $y1 = $tmp;
$tmp = $x2; $x2 = $y2; $y2 = $tmp;
$swapx = true;
}
$m = (float)(( $y2 - $y1 ) / ( $x2 - $x1 ));
$b = (float)($y1 - $m*$x1);
$strx = min ( $x1 , $x2 );
$endx = max ( $x1 , $x2 );
$x=(int)0;
# the original loop was based on one for_loop
# with the if_swap inside. to speed up this loop
# i double it, to keep off the permanent if_call's.
if (!$swapx) {
for ($x = $strx; $x <= $endx; $x++) {
$y = (int)($m*$x + $b);
imagettftext($image, $size, 0, $x, $y,
$color, $fontfile,$str);
}
} else {
for ($x = $strx; $x <= $endx; $x++) {
$y = (int)($m*$x + $b);
imagettftext($image, $size, 0, $y, $x,
$color, $fontfile,$str);
}
}
}
nanobot at chipx86 dot com
17-Jun-2003 05:28
Here is a function for making antialiased lines:
function imagesmoothline ( $image , $x1 , $y1 , $x2 , $y2 , $color )
{
$colors = imagecolorsforindex ( $image , $color );
if ( $x1 == $x2 )
{
imageline ( $image , $x1 , $y1 , $x2 , $y2 , $color ); // Vertical line
}
else
{
$m = ( $y2 - $y1 ) / ( $x2 - $x1 );
$b = $y1 - $m * $x1;
if ( abs ( $m ) <= 1 )
{
$x = min ( $x1 , $x2 );
$endx = max ( $x1 , $x2 );
while ( $x <= $endx )
{
$y = $m * $x + $b;
$y == floor ( $y ) ? $ya = 1 : $ya = $y - floor ( $y );
$yb = ceil ( $y ) - $y;
$tempcolors = imagecolorsforindex ( $image , imagecolorat ( $image , $x , floor ( $y ) ) );
$tempcolors['red'] = $tempcolors['red'] * $ya + $colors['red'] * $yb;
$tempcolors['green'] = $tempcolors['green'] * $ya + $colors['green'] * $yb;
$tempcolors['blue'] = $tempcolors['blue'] * $ya + $colors['blue'] * $yb;
if ( imagecolorexact ( $image , $tempcolors['red'] , $tempcolors['green'] , $tempcolors['blue'] ) == -1 ) imagecolorallocate ( $image , $tempcolors['red'] , $tempcolors['green'] , $tempcolors['blue'] );
imagesetpixel ( $image , $x , floor ( $y ) , imagecolorexact ( $image , $tempcolors['red'] , $tempcolors['green'] , $tempcolors['blue'] ) );
$tempcolors = imagecolorsforindex ( $image , imagecolorat ( $image , $x , ceil ( $y ) ) );
$tempcolors['red'] = $tempcolors['red'] * $yb + $colors['red'] * $ya;
$tempcolors['green'] = $tempcolors['green'] * $yb + $colors['green'] * $ya;
$tempcolors['blue'] = $tempcolors['blue'] * $yb + $colors['blue'] * $ya;
if ( imagecolorexact ( $image , $tempcolors['red'] , $tempcolors['green'] , $tempcolors['blue'] ) == -1 ) imagecolorallocate ( $image , $tempcolors['red'] , $tempcolors['green'] , $tempcolors['blue'] );
imagesetpixel ( $image , $x , ceil ( $y ) , imagecolorexact ( $image , $tempcolors['red'] , $tempcolors['green'] , $tempcolors['blue'] ) );
$x ++;
}
}
else
{
$y = min ( $y1 , $y2 );
$endy = max ( $y1 , $y2 );
while ( $y <= $endy )
{
$x = ( $y - $b ) / $m;
$x == floor ( $x ) ? $xa = 1 : $xa = $x - floor ( $x );
$xb = ceil ( $x ) - $x;
$tempcolors = imagecolorsforindex ( $image , imagecolorat ( $image , floor ( $x ) , $y ) );
$tempcolors['red'] = $tempcolors['red'] * $xa + $colors['red'] * $xb;
$tempcolors['green'] = $tempcolors['green'] * $xa + $colors['green'] * $xb;
$tempcolors['blue'] = $tempcolors['blue'] * $xa + $colors['blue'] * $xb;
if ( imagecolorexact ( $image , $tempcolors['red'] , $tempcolors['green'] , $tempcolors['blue'] ) == -1 ) imagecolorallocate ( $image , $tempcolors['red'] , $tempcolors['green'] , $tempcolors['blue'] );
imagesetpixel ( $image , floor ( $x ) , $y , imagecolorexact ( $image , $tempcolors['red'] , $tempcolors['green'] , $tempcolors['blue'] ) );
$tempcolors = imagecolorsforindex ( $image , imagecolorat ( $image , ceil ( $x ) , $y ) );
$tempcolors['red'] = $tempcolors['red'] * $xb + $colors['red'] * $xa;
$tempcolors['green'] = $tempcolors['green'] * $xb + $colors['green'] * $xa;
$tempcolors['blue'] = $tempcolors['blue'] * $xb + $colors['blue'] * $xa;
if ( imagecolorexact ( $image , $tempcolors['red'] , $tempcolors['green'] , $tempcolors['blue'] ) == -1 ) imagecolorallocate ( $image , $tempcolors['red'] , $tempcolors['green'] , $tempcolors['blue'] );
imagesetpixel ( $image , ceil ( $x ) , $y , imagecolorexact ( $image , $tempcolors['red'] , $tempcolors['green'] , $tempcolors['blue'] ) );
$y ++;
}
}
}
}
EDITOR: My previous code contained bugs. Please use this one instead.
kramesch_NOSPAM_ at _nospam_idsolutions dot at
26-Feb-2002 01:44
Here is a simple code to draw a line with an arbitrary stroke. The parameter aStroke is treated as a cyclic boolean array where true equals "set a point"
e.g. $aDotStroke = array(true,false);
function ImageStrokeLine($im,$x1,$y1,$x2,$y2,$farbe, $aStroke)
{
$deltax = abs($x2 - $x1);
$deltay = abs($y2 - $y1);
$x = $x1;
$y = $y1;
if ($x2 >= $x1)
{
$xinc1 = 1;
$xinc2 = 1;
}
else
{
$xinc1 = -1;
$xinc2 = -1;
}
if ($y2 >= $y1)
{
$yinc1 = 1;
$yinc2 = 1;
}
else
{
$yinc1 = -1;
$yinc2 = -1;
}
if ($deltax >= $deltay)
{
$xinc1 = 0;
$yinc2 = 0;
$den = $deltax;
$num = $deltax / 2;
$numadd = $deltay;
$numpixels = $deltax;
}
else
{
$xinc2 = 0;
$yinc1 = 0;
$den = $deltay;
$num = $deltay / 2;
$numadd = $deltax;
$numpixels = $deltay;
}
for ($curpixel = 0; $curpixel <= $numpixels; $curpixel++)
{
if ($iStrokeCount >= count($aStroke))
{
$iStrokeCount = 0;
}
if ($aStroke[$iStrokeCount++])
{
ImageSetPixel($im,$x, $y,$farbe);
}
$num += $numadd;
if ($num >= $den)
{
$num -= $den;
$x += $xinc1;
$y += $yinc1;
}
$x += $xinc2;
$y += $yinc2;
}
}
darren at php4hosting dot com
28-Oct-2000 10:48
It does work (With a bit of editing)
save the following as graph.php (You dont need any directorys)
<?php
Header("Content-type: image/png");
$picWidth=360*2;
$picHeight=200;
$pic=ImageCreate($picWidth+1,$picHeight+1);
$cWhite=ImageColorAllocate($pic,255,255,255);
ImageFilledRectangle($pic,0,0,$picWidth+1,$picHeight+1,$cWhite);
$cRed=ImageColorAllocate($pic,255,0,0);
$cBlue=ImageColorAllocate($pic,0,0,255);
$curX=0;
$curY=$picHeight;
for($pt=0;$pt<$picWidth;$pt++){
$newX=$curX+1;
$newY=($picHeight/2)+(cos(deg2rad($newX))*($picHeight/2));
ImageLine($pic,$curX,$curY,$newX,$newY,$cRed);
$curX=$newX;
$curY=$newY;
}
$curX=0;
$curY=$picHeight/2;
for($pt=0;$pt<$picWidth;$pt++){
$newX=$curX+1;
$newY=($picHeight/2)+(sin(deg2rad($newX))*($picHeight/2));
ImageLine($pic,$curX,$curY,$newX,$newY,$cBlue);
$curX=$newX;
$curY=$newY;
}
$cBlack=ImageColorAllocate($pic,0,0,0);
ImageLine($pic,0,0,0,$picHeight,$cBlack);
ImageLine($pic,0,$picHeight/2,$picWidth,$picHeight/2,$cBlack);
ImagePNG($pic);
ImageDestroy($pic);
?>
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imagelayereffect