src/image/ImgTrans.php
<?php
/**
* JPGraph v4.0.3
*/
namespace Amenadiel\JpGraph\Image;
use Amenadiel\JpGraph\Util;
/**
* File: JPGRAPH_IMGTRANS.PHP
* // Description: Extension for JpGraph to do some simple img transformations
* // Created: 2003-09-06
* // Ver: $Id: jpgraph_imgtrans.php 1106 2009-02-22 20:16:35Z ljp $
* //
* // Copyright (c) Asial Corporation. All rights reserved.
*/
/**
* @class ImgTrans
* // Perform some simple image transformations.
*/
class ImgTrans
{
private $gdImg;
public function __construct($aGdImg)
{
// Constructor
$this->gdImg = $aGdImg;
}
// --------------------------------------------------------------------
// _TransVert3D() and _TransHor3D() are helper methods to
// Skew3D().
// --------------------------------------------------------------------
public function _TransVert3D($aGdImg, $aHorizon = 100, $aSkewDist = 120, $aDir = SKEW3D_DOWN, $aMinSize = true, $aFillColor = '#FFFFFF', $aQuality = false, $aBorder = false, $aHorizonPos = 0.5)
{
// Parameter check
if ($aHorizonPos < 0 || $aHorizonPos > 1.0) {
Util\JpGraphError::RaiseL(9001);
//("Value for image transformation out of bounds.\nVanishing point on horizon must be specified as a value between 0 and 1.");
}
$w = imagesx($aGdImg);
$h = imagesy($aGdImg);
// Create new image
$ww = $w;
if ($aMinSize) {
$hh = ceil($h * $aHorizon / ($aSkewDist + $h));
} else {
$hh = $h;
}
$newgdh = imagecreatetruecolor($ww, $hh);
$crgb = new RGB($newgdh);
$fillColor = $crgb->Allocate($aFillColor);
imagefilledrectangle($newgdh, 0, 0, $ww - 1, $hh - 1, $fillColor);
if ($aBorder) {
$colidx = $crgb->Allocate($aBorder);
imagerectangle($newgdh, 0, 0, $ww - 1, $hh - 1, $colidx);
}
$mid = round($w * $aHorizonPos);
$last = $h;
for ($y = 0; $y < $h; ++$y) {
$yp = $h - $y - 1;
$yt = floor($yp * $aHorizon / ($aSkewDist + $yp));
if (!$aQuality) {
if ($last <= $yt) {
continue;
}
$last = $yt;
}
for ($x = 0; $x < $w; ++$x) {
$xt = ($x - $mid) * $aSkewDist / ($aSkewDist + $yp);
if ($aDir == SKEW3D_UP) {
$rgb = imagecolorat($aGdImg, $x, $h - $y - 1);
} else {
$rgb = imagecolorat($aGdImg, $x, $y);
}
$r = ($rgb >> 16) & 0xFF;
$g = ($rgb >> 8) & 0xFF;
$b = $rgb & 0xFF;
$colidx = imagecolorallocate($newgdh, $r, $g, $b);
$xt = round($xt + $mid);
if ($aDir == SKEW3D_UP) {
$syt = $yt;
} else {
$syt = $hh - $yt - 1;
}
if (!empty($set[$yt])) {
$nrgb = imagecolorat($newgdh, $xt, $syt);
$nr = ($nrgb >> 16) & 0xFF;
$ng = ($nrgb >> 8) & 0xFF;
$nb = $nrgb & 0xFF;
$colidx = imagecolorallocate(
$newgdh,
floor(($r + $nr) / 2),
floor(($g + $ng) / 2),
floor(($b + $nb) / 2)
);
}
imagesetpixel($newgdh, $xt, $syt, $colidx);
}
$set[$yt] = true;
}
return $newgdh;
}
// --------------------------------------------------------------------
// _TransVert3D() and _TransHor3D() are helper methods to
// Skew3D().
// --------------------------------------------------------------------
public function _TransHor3D($aGdImg, $aHorizon = 100, $aSkewDist = 120, $aDir = SKEW3D_LEFT, $aMinSize = true, $aFillColor = '#FFFFFF', $aQuality = false, $aBorder = false, $aHorizonPos = 0.5)
{
$w = imagesx($aGdImg);
$h = imagesy($aGdImg);
// Create new image
$hh = $h;
if ($aMinSize) {
$ww = ceil($w * $aHorizon / ($aSkewDist + $w));
} else {
$ww = $w;
}
$newgdh = imagecreatetruecolor($ww, $hh);
$crgb = new RGB($newgdh);
$fillColor = $crgb->Allocate($aFillColor);
imagefilledrectangle($newgdh, 0, 0, $ww - 1, $hh - 1, $fillColor);
if ($aBorder) {
$colidx = $crgb->Allocate($aBorder);
imagerectangle($newgdh, 0, 0, $ww - 1, $hh - 1, $colidx);
}
$mid = round($h * $aHorizonPos);
$last = -1;
for ($x = 0; $x < $w - 1; ++$x) {
$xt = floor($x * $aHorizon / ($aSkewDist + $x));
if (!$aQuality) {
if ($last >= $xt) {
continue;
}
$last = $xt;
}
for ($y = 0; $y < $h; ++$y) {
$yp = $h - $y - 1;
$yt = ($yp - $mid) * $aSkewDist / ($aSkewDist + $x);
if ($aDir == SKEW3D_RIGHT) {
$rgb = imagecolorat($aGdImg, $w - $x - 1, $y);
} else {
$rgb = imagecolorat($aGdImg, $x, $y);
}
$r = ($rgb >> 16) & 0xFF;
$g = ($rgb >> 8) & 0xFF;
$b = $rgb & 0xFF;
$colidx = imagecolorallocate($newgdh, $r, $g, $b);
$yt = floor($hh - $yt - $mid - 1);
if ($aDir == SKEW3D_RIGHT) {
$sxt = $ww - $xt - 1;
} else {
$sxt = $xt;
}
if (!empty($set[$xt])) {
$nrgb = imagecolorat($newgdh, $sxt, $yt);
$nr = ($nrgb >> 16) & 0xFF;
$ng = ($nrgb >> 8) & 0xFF;
$nb = $nrgb & 0xFF;
$colidx = imagecolorallocate(
$newgdh,
floor(($r + $nr) / 2),
floor(($g + $ng) / 2),
floor(($b + $nb) / 2)
);
}
imagesetpixel($newgdh, $sxt, $yt, $colidx);
}
$set[$xt] = true;
}
return $newgdh;
}
// --------------------------------------------------------------------
// Skew image for the apperance of a 3D effect
// This transforms an image into a 3D-skewed version
// of the image. The transformation is specified by giving the height
// of the artificial horizon and specifying a "skew" factor which
// is the distance on the horizon line between the point of
// convergence and perspective line.
//
// The function returns the GD handle of the transformed image
// leaving the original image untouched.
//
// Parameters:
// * $aGdImg, GD handle to the image to be transformed
// * $aHorizon, Distance to the horizon
// * $aSkewDist, Distance from the horizon point of convergence
// on the horizon line to the perspective points. A larger
// value will fore-shorten the image more
// * $aDir, parameter specifies type of convergence. This of this
// as the walls in a room you are looking at. This specifies if the
// image should be applied on the left,right,top or bottom walls.
// * $aMinSize, true=make the new image just as big as needed,
// false = keep the image the same size as the original image
// * $aFillColor, Background fill color in the image
// * $aHiQuality, true=performa some interpolation that improves
// the image quality but at the expense of performace. Enabling
// high quality will have a dramatic effect on the time it takes
// to transform an image.
// * $aBorder, if set to anything besides false this will draw a
// a border of the speciied color around the image
// --------------------------------------------------------------------
public function Skew3D($aHorizon = 120, $aSkewDist = 150, $aDir = SKEW3D_DOWN, $aHiQuality = false, $aMinSize = true, $aFillColor = '#FFFFFF', $aBorder = false)
{
return $this->_Skew3D(
$this->gdImg,
$aHorizon,
$aSkewDist,
$aDir,
$aHiQuality,
$aMinSize,
$aFillColor,
$aBorder
);
}
public function _Skew3D($aGdImg, $aHorizon = 120, $aSkewDist = 150, $aDir = SKEW3D_DOWN, $aHiQuality = false, $aMinSize = true, $aFillColor = '#FFFFFF', $aBorder = false)
{
if ($aDir == SKEW3D_DOWN || $aDir == SKEW3D_UP) {
return $this->_TransVert3D($aGdImg, $aHorizon, $aSkewDist, $aDir, $aMinSize, $aFillColor, $aHiQuality, $aBorder);
}
return $this->_TransHor3D($aGdImg, $aHorizon, $aSkewDist, $aDir, $aMinSize, $aFillColor, $aHiQuality, $aBorder);
}
}