How to panorama image to cube in PHP [closed] - php

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how to convert below panaroma image to cube iamges in php?
I used imagick, js code and ... but do not result.
main image
please help me
thanks

Answer 1

After much effort ...
I got the right result
my final code:
# get x,y,z coords from out image pixels coords
# i,j are pixel coords
# faceIdx is face number
# faceSize is edge length
function outImgToXYZ($i, $j, $faceIdx, $faceSize)
{
$a = 2.0 * (float) $i / $faceSize;
$b = 2.0 * (float) $j / $faceSize;
switch ($faceIdx)
{
case 0: return [-1.0, 1.0 - $a, 3.0 - $b]; break; # back
case 1: return [$a - 3.0, -1.0, 3.0 - $b]; break; # left
case 2: return [1.0, $a - 5.0, 3.0 - $b]; break; # front
case 3: return [7.0 - $a, 1.0, 3.0 - $b]; break; # right
case 4: return [$b - 1.0, $a - 5.0, 1.0]; break; # top
case 5: return [5.0 - $b, $a - 5.0, -1.0]; break; # bottom
}
return [0, 0, 0];
}
function clip($x, $min, $max)
{
if ($x > $max) return $max;
if ($x < $min) return $min;
return $x;
}
# convert using an inverse transformation
function convertFace($imgIn, $imgInWidth, $imgInHeight, $imgOut, $imgOutWidth, $imgOutHeight)
{
$pi = pi();
$edge = $imgInWidth / 4;
$face = 0;
$face2 = 0;
$rng = null;
for($xOut = 0; $xOut <= $imgOutWidth; $xOut++)
{
$face = floor($xOut / $edge); // 0 - back, 1 - left 2 - front, 3 - right
if ($face === 2) $rng = range(0, $edge * 3, 1);
else $rng = range($edge, $edge * 2, 1);
for($yOut =0; $yOut <= $imgOutHeight; $yOut++)
{
if ($yOut < $edge) $face2 = 4; // top
else if ($yOut >= 2 * $edge) $face2 = 5; // bottom
else $face2 = $face;
list($x, $y, $z) = outImgToXYZ($xOut, $yOut, $face2, $edge);
$theta = atan2($y, $x);
$r = hypot($x, $y);
$phi = atan2($z, $r);
# source img coords
$uf = 2.0 * $edge * ($theta + $pi) / $pi;
$vf = 2.0 * $edge * ($pi / 2 - $phi) / $pi;
# Use bilinear interpolation between the four surrounding pixels
$ui = floor($uf); # coord of pixel to bottom left
$vi = floor($vf);
$u2 = $ui + 1; # coords of pixel to top right
$v2 = $vi + 1;
$mu = $uf - $ui; # fraction of way across pixel
$nu = $vf - $vi;
# Pixel values of four corners
$a = imagecolorsforindex($imgIn, imagecolorat($imgIn, $ui % $imgInWidth, clip($vi, 0, $imgInHeight - 1)));
$b = imagecolorsforindex($imgIn, imagecolorat($imgIn, $u2 % $imgInWidth, clip($vi, 0, $imgInHeight - 1)));
$c = imagecolorsforindex($imgIn, imagecolorat($imgIn, $ui % $imgInWidth, clip($v2, 0, $imgInHeight - 1)));
$d = imagecolorsforindex($imgIn, imagecolorat($imgIn, $u2 % $imgInWidth, clip($v2, 0, $imgInHeight - 1)));
# interpolate
list($r, $g, $b) =
[
$a["red"] * (1 - $mu) * (1 - $nu) + $b["red"] * ($mu) * (1 - $nu) + $c["red"] * (1 - $mu) * $nu + $d["red"] * $mu * $nu,
$a["green"] * (1 - $mu) * (1 - $nu) + $b["green"] * ($mu) * (1 - $nu) + $c["green"] * (1 - $mu) * $nu + $d["green"] * $mu * $nu,
$a["blue"] * (1 - $mu) * (1 - $nu) + $b["blue"] * ($mu) * (1 - $nu) + $c["blue"] * (1 - $mu) * $nu + $d["blue"] * $mu * $nu
];
imagesetpixel($imgOut, $xOut, $yOut, imagecolorallocate($imgOut, (int) round($r), (int) round($g), (int) round($b)));
}
}
return $imgOut;
}
// start convert
$imgInPath = "./main.jpg";
$imgIn = imagecreatefromjpeg($imgInPath);
$imgInSize = getimagesize($imgInPath);
$imgInWidth = $imgInSize[0];
$imgInHeight = $imgInSize[1];
$imgOutWidthHeight = $imgInWidth / 4;
$imgOutFullWidth = $imgInWidth;
$imgOutFullHeight = $imgInWidth * 3 / 4;
$imgFormat = "jpg";
$imgOut = imagecreate($imgOutFullWidth, $imgOutFullHeight);
imagefill($imgOut, 0, 0, imagecolorallocate($imgOut, 0, 0, 0));
imagejpeg($imgOut, "./temp.jpg", 100);
$imgOut = imagecreatefromjpeg("./temp.jpg");
imagefill($imgOut, 0, 0, imagecolorallocate($imgOut, 0, 0, 0));
$imgOut = convertFace($imgIn, $imgInWidth, $imgInHeight, $imgOut, $imgOutFullWidth, $imgOutFullHeight);
imagejpeg($imgOut, "./temp.jpg", 100);
imagedestroy($imgOut);
$faceNames = [['', '', 'top', ''], ['left', 'front', 'right', 'back'], ['', '', 'bottom', '']];
for($i = 0; $i < 3; $i++)
{
for($j = 0; $j < 4; $j++)
{
$faceName = $faceNames[$i][$j];
if($faceName != "")
{
$im = imagecreatefromjpeg("temp.jpg");
$im2 = imagecrop($im, ["x" => ($j * $imgOutWidthHeight), "y" => ($i * $imgOutWidthHeight), "width" => $imgOutWidthHeight, "height" => $imgOutWidthHeight]);
if($im2 !== FALSE)
{
imagejpeg($im2, "main_$faceName.jpg", 100);
imagedestroy($im2);
}
imagedestroy($im);
}
}
}
unlink("./temp.jpg");