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visualcube.php
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visualcube.php
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<?php
/*
File: visualcube.php
Date: 02 Apr 2010
Author(s): Conrad Rider (www.crider.co.uk)
Contributors: Shotaro Makisumi <smakisumi@gmail.com>, Jaume Casado Ruiz <minterior@gmail.com>
Description: Main script to generate cube images
This file is part of VisualCube.
VisualCube is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
VisualCube is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with Foobar. If not, see <http://www.gnu.org/licenses/>.
Copyright (C) 2010 Conrad Rider
TODO:
* Automatic Permutation Arrows
* Other puzzles
CHANGES:
(Version 0.5.5 to 0.5.6)
* Modified options to attempt to fix rendering issues in ImageMagick v6.9.x
(Version 0.5.4 to 0.5.5)
* Changed to using style attribute to fix transparrancy issues
(Version 0.5.3 to 0.5.4)
* Added configurable DB host
* Added configurable path to ImageMagick convert binary
(Version 0.5.2 to 0.5.3)
* Fixed links on API page
* Changed default format to SVG, avoiding ImageMagick failures
* Addressed PHP warnings and fixed typos in the code
(Version 0.5.1 to 0.5.2)
* Separate configuration file
* Separate API definition file - easier to provide custom API page
(Version 0.3.0 to 0.4.0)
* Algs applicable to NxNxN cubes
* Wider range of stage masks, with the ability to rotate them
* Style variables configurable via cookies
*/
// Import configuration values
require 'visualcube_config.php';
global
$DB_HOST,
$DB_NAME,
$DB_USERNAME,
$DB_PASSWORD,
$MAX_PZL_DIM,
$ENABLE_COOKIES,
$ENABLE_CACHE,
$CACHE_IMG_SIZE_LIMIT,
$DEFAULTS;
// VisualCube version
$VERSION = "0.5.5";
// Causes cube svg to be outputted as XML for inspection
$DEBUG = false;
// Do not display errors
// if (!$DEBUG) error_reporting(0);
// ----------------------[ API Page ]-----------------------
// If no format specified, display API page
if(!array_key_exists('fmt', $_REQUEST)){
include 'visualcube_api.php';
// Otherwise render a cube
}else{
// Check cache for image and return if it exists in cache
if($ENABLE_CACHE){
// Connect to db
$mysql_con = mysqli_connect($DB_HOST, $DB_USERNAME, $DB_PASSWORD, $DB_NAME) or die("Connect Error: " . mysqli_connect_error());
$hash = md5($_SERVER['QUERY_STRING']);
$imgdata = get_arrays($mysql_con, "SELECT fmt, req, rcount, img FROM vcache WHERE hash='$hash'");
// Verify query strings are equal (deals with unlikely, but possible hash collisions)
if($imgdata && count($imgdata) > 0 && $imgdata[0]['req'] == $_SERVER['QUERY_STRING']){
display_img($imgdata[0]['img'], $imgdata[0]['fmt']);
// Increment access count
mysqli_query($mysql_con, "UPDATE vcache SET rcount=rcount+1 WHERE hash='$hash'");
// Disconnect from db
mysqli_close();
return;
}
}
// Otherwise generate image
// -----------------[ Constants ]-----------------
// Faces
$U = 0; $R = 1; $F = 2; $D = 3; $L = 4; $B = 5; $N = 6; $O = 7; $T = 8;
// Colour constants
$BLACK = '000000';
$DGREY = '404040';
$GREY = '808080';
$SILVER = 'BFBFBF';
$WHITE = 'FFFFFF';
$YELLOW = 'FEFE00';
$RED = 'EE0000';//'FE0000';
$ORANGE = 'FFA100';//'FE8600';
$BLUE = '0000F2';
$GREEN = '00D800';//'00F300';
$PURPLE = 'A83DD9';
$PINK = 'F33D7B';
// Other colour schemes
// Array('FFFF00', 'FF0000', '0000FF', 'FFFFFF', 'FF7F00', '00FF00'); // Basic
// Array('EFEF00', 'C80000', '0000B6', 'F7F7F7', 'FFA100', '00B648'); // Cubestation
// Array('EFFF01', 'FF0000', '1600FF', 'FEFFFC', 'FF8000', '047F01'); // cube.rider
// Array('FEFE00', 'FE0000', '0000F2', 'FEFEFE', 'FE8600', '00F300'); // alg.garron
// Name colour mapping
$NAME_COL = Array(
'black' => $BLACK,
'dgrey' => $DGREY,
'grey' => $GREY,
'silver' => $SILVER,
'white' => $WHITE,
'yellow' => $YELLOW,
'red' => $RED,
'orange' => $ORANGE,
'blue' => $BLUE,
'green' => $GREEN,
'purple' => $PURPLE,
'pink' => $PINK);
// Abbreviation colour mapping
$ABBR_COL = Array(
'n' => $BLACK,
'd' => $DGREY,
'l' => $GREY,
's' => $SILVER,
'w' => $WHITE,
'y' => $YELLOW,
'r' => $RED,
'o' => $ORANGE,
'b' => $BLUE,
'g' => $GREEN,
'm' => $PURPLE,
'p' => $PINK,
't' => 't'); // Transparent
// Default colour scheme
$DEF_SCHEME = Array ($YELLOW, $RED, $BLUE, $WHITE, $ORANGE, $GREEN, $DGREY, $GREY, 't');
// $DEF_SCHEME = Array ($WHITE, $RED, $GREEN, $BLUE, $ORANGE, $YELLOW, $GREY, $SILVER, 't'); // Japanese scheme
// Corresponding mappings from colour code to face id
$DEF_SCHCODE = Array('y', 'r', 'b', 'w', 'o', 'g',);
//$DEF_SCHCODE = Array('w', 'r', 'g', 'b', 'o', 'y',); // Japanese scheme
// -----------------------[ User Parameters ]--------------------
// Retrieve format from user, default to first in list otherwise
$LEGAL_FMT = Array ('gif', 'png', 'svg', 'jpg', 'jpe', 'jpeg', 'tiff', 'ico');
$fmt = $LEGAL_FMT[0];
if(array_key_exists('fmt', $_REQUEST) || array_key_exists('fmt', $DEFAULTS)){
$fmt = array_key_exists('fmt', $_REQUEST) ? $_REQUEST['fmt'] : $DEFAULTS['fmt'];
if(!in_array($fmt, $LEGAL_FMT))
$fmt = $LEGAL_FMT[0];
else{
if($fmt == 'jpeg' || $fmt == 'jpe') $fmt = 'jpg';
}
}
// Default rotation sequence
$rtn = Array(Array(1, 45), Array(0, -34));
// Get rotation from request (or cookie)
if(array_key_exists('r', $_REQUEST) || array_key_exists('r', $DEFAULTS)
|| ($ENABLE_COOKIES && isset($_COOKIE['vc_r']) && $_COOKIE['vc_r'] != '')){
$_r = array_key_exists('r', $_REQUEST) ? $_REQUEST['r'] :
($ENABLE_COOKIES && isset($_COOKIE['vc_r']) && $_COOKIE['vc_r'] != '' ?
$_COOKIE['vc_r'] : $DEFAULTS['r']);
preg_match_all('/([xyz])(\-?[0-9][0-9]?[0-9]?)/', $_r, $matches);
for($i = 0; $i < count($matches[0]); $i++){
switch($matches[1][$i]){
case 'x' : $rtn_[$i][0] = 0; break;
case 'y' : $rtn_[$i][0] = 1; break;
case 'z' : $rtn_[$i][0] = 2; break;
default : break;
}
$rtn_[$i][1] = $matches[2][$i];
}
if($rtn_) $rtn = $rtn_;
}
// Retrieve cube Dimension
$dim = $DEFAULTS['pzl'];
if(array_key_exists('pzl', $_REQUEST) && is_numeric($_REQUEST['pzl'])
&& $_REQUEST['pzl'] > 0 && $_REQUEST['pzl'] <= $MAX_PZL_DIM)
$dim = $_REQUEST['pzl'];
// Default scheme
$scheme = $DEF_SCHEME;
// Default mapping from colour code to face id
$schcode = $DEF_SCHCODE;
// Retrieve colour scheme from request (or cookie)
if(array_key_exists('sch', $_REQUEST) || array_key_exists('sch', $DEFAULTS)
|| ($ENABLE_COOKIES && isset($_COOKIE['vc_sch']) && $_COOKIE['vc_sch'] != '')){
// Retrieve from cookie or 'sch' variable
$sd = array_key_exists('sch', $_REQUEST) ? $_REQUEST['sch'] :
($ENABLE_COOKIES && isset($_COOKIE['vc_sch']) && $_COOKIE['vc_sch'] != '' ?
$_COOKIE['vc_sch'] : $DEFAULTS['sch']);
if(preg_match('/^[ndlswyrogbpmt]{6}$/', $sd)){
for($i = 0; $i < 6; $i++){
$scheme[$i] = $ABBR_COL[$sd[$i]];
$schcode[$i] = $sd[$i];
}
}
else{
$cols = preg_split('/,/', $sd);
if(count($cols) == 6){
$cok = true;
for($i = 0; $i < 6; $i++){
$scheme[$i] = parse_col($cols[$i]);
if(!$cols[$i]) $cok = false;
}
if(!$cok) $scheme = $DEF_SCHEME;
}
}
}
// Retrieve size from user
$size = $DEFAULTS['size']; // default
if(array_key_exists('size', $_REQUEST) && is_numeric($_REQUEST['size'])){
$size = $_REQUEST['size'];
if($size < 0) $size = 0;
if($size > 1024) $size = 1024;
}
// Retrieve dist variable - projection distance (how close the eye is to the cube)
$dist = $DEFAULTS['dist']; // default dist parameter
if(array_key_exists('dist', $_REQUEST) || ($ENABLE_COOKIES && isset($_COOKIE['vc_dist']))){
$dist_ = array_key_exists('dist', $_REQUEST) ? $_REQUEST['dist'] : $_COOKIE['vc_dist'];
if(is_numeric($dist_)) $dist = $dist_ < 1 ? 1 : ($dist_ > 100 ? 100 : $dist_);
}
// Retrieve view variable
$view = $DEFAULTS['view'];
if(array_key_exists('view', $_REQUEST)){
$view = $_REQUEST['view'];
}
// Retrieve background colour from request (or cookies)
$bg = parse_col($DEFAULTS['bg']);
if(!$bg) $bg = 'FFFFFF';
if(array_key_exists('bg', $_REQUEST) || ($ENABLE_COOKIES && isset($_COOKIE['vc_bg']))){
$bg_ = array_key_exists('bg', $_REQUEST) ? $_REQUEST['bg'] : $_COOKIE['vc_bg'];
if($bg_ == "t") $bg = null;
else{
$bg_ = parse_col($bg_);
if($bg_) $bg = $bg_;
}
}
// Retrieve cube colour from request (or cookies)
$cc = $view == 'trans' ? $SILVER : parse_col($DEFAULTS['cc']);
if(array_key_exists('cc', $_REQUEST) || ($ENABLE_COOKIES && isset($_COOKIE['vc_cc']))){
$cc_ = array_key_exists('cc', $_REQUEST) ? $_REQUEST['cc'] : $_COOKIE['vc_cc'];
$cc_ = parse_col($cc_);
if($cc_) $cc = $cc_;
}
$cc = !$cc ? $BLACK : $cc;
// Retrieve cube opacity from request (or cookies)
$co = $view == 'trans' ? 50 : $DEFAULTS['co'];
if(array_key_exists('co', $_REQUEST) || ($ENABLE_COOKIES && isset($_COOKIE['vc_co']))){
$co_ = array_key_exists('co', $_REQUEST) ? $_REQUEST['co'] : $_COOKIE['vc_co'];
if(preg_match('/^[0-9][0-9]?$/', $co_)) $co = $co_;
}
$co = !is_numeric($co) || $co < 0 || $co > 100 ? 100 : $co;
// Retrieve face opacity from request (or cookies)
$fo = $DEFAULTS['fo'];
if(!is_numeric($fo) || $fo < 0 || $fo > 100)
$fo = 100;
if(array_key_exists('fo', $_REQUEST) || ($ENABLE_COOKIES && isset($_COOKIE['vc_fo']))){
$fo_ = array_key_exists('fo', $_REQUEST) ? $_REQUEST['fo'] : $_COOKIE['vc_fo'];
if(preg_match('/^[0-9][0-9]?$/', $fo_)) $fo = $fo_;
}
// Create default face defs
for($fc = 0; $fc < 6; $fc++){ for($i = 0; $i < $dim * $dim; $i++)
$facelets[$fc * $dim * $dim + $i] = $fc;
}
// Retrieve colour def
// This overrides face def and makes the $scheme variable redundant (ie, gets reset to default)
$using_cols = false;
$uf = array_key_exists('fc', $_REQUEST) ? $_REQUEST['fc'] : (!array_key_exists('fd', $_REQUEST) ? $DEFAULTS['fc'] : '');
if(preg_match('/^[ndlswyrobgmpt]+$/', $uf)){
$using_cols = true;
$scheme = $DEF_SCHEME;
$nf = strlen($uf);
for($fc = 0; $fc < 6; $fc++){ for($i = 0; $i < $dim * $dim; $i++){
// Add user defined face
if($fc * $dim *$dim + $i < $nf)
$facelets[$fc * $dim * $dim + $i] = $uf[$fc * $dim *$dim + $i];
// Otherwise use scheme code
else
$facelets[$fc * $dim * $dim + $i] = $schcode[$fc];
}}
}
// Retrieve facelet def
if(!$uf){ $uf = array_key_exists('fd', $_REQUEST) ? $_REQUEST['fd'] : $DEFAULTS['fd'];
if(preg_match('/^[udlrfbnot]+$/', $uf)){
// Map from face names to numeric face ID
$fd_map = Array('u' => $U, 'r' => $R, 'f' => $F, 'd' => $D, 'l' => $L, 'b' => $B, 'n' => $N, 'o' => $O, 't' => $T);
$nf = strlen($uf);
for($fc = 0; $fc < 6; $fc++){ for($i = 0; $i < $dim * $dim; $i++){
// Add user defined face
if($fc * $dim *$dim + $i < $nf)
$facelets[$fc * $dim * $dim + $i] = $fd_map[$uf[$fc * $dim *$dim + $i]];
// Otherwise default to a blank/transparent face
else $facelets[$fc * $dim *$dim + $i] = $view == 'trans' ? $T : $N;
}}
}}
// Retrieve stage variable
if(array_key_exists('stage', $_REQUEST) || array_key_exists('stage', $DEFAULTS)){
$stage = array_key_exists('stage', $_REQUEST) ? $_REQUEST['stage'] : $DEFAULTS['stage'];
// Extract rotation sequence if present
$p = strrpos($stage, '-');
$st_rtn = '';
if($p > 0){
$st_rtn = urldecode(substr($stage, $p+1));
$stage = substr($stage, 0, $p);
}
// Stage Definitions
$mask = '';
if($dim == 3){
switch($stage){
case 'fl' :
$mask = "000000000000000111000000111111111111000000111000000111";
break;
case 'f2l' :
$mask = "000000000000111111000111111111111111000111111000111111";
break;
case 'll' :
$mask = "111111111111000000111000000000000000111000000111000000";
break;
case 'cll' :
$mask = "101010101101000000101000000000000000101000000101000000";
break;
case 'ell' :
$mask = "010111010010000000010000000000000000010000000010000000";
break;
case 'oll' :
$mask = "111111111000000000000000000000000000000000000000000000";
break;
case 'ocll' :
$mask = "101010101000000000000000000000000000000000000000000000";
break;
case 'oell' :
$mask = "010111010000000000000000000000000000000000000000000000";
break;
case 'coll' :
$mask = "111111111101000000101000000000000000101000000101000000";
break;
case 'ocell' :
$mask = "111111111010000000010000000000000000010000000010000000";
break;
case 'wv' :
$mask = "111111111000111111000111111111111111000111111000111111";
break;
case 'vh' :
$mask = "010111010000111111000111111111111111000111111000111111";
break;
case 'els' :
$mask = "010111010000111011000111110110111111000111111000111111";
break;
case 'cls' :
$mask = "111111111000111111000111111111111111000111111000111111";
break;
case 'cmll' :
$mask = "101000101101111111101101101101101101101111111101101101";
break;
case 'cross' :
$mask = "000000000000010010000010010010111010000010010000010010";
break;
case 'f2l_3' :
$mask = "000000000000110110000011011011111010000010010000010010";
break;
case 'f2l_2' :
$mask = "000000000000011011000010010010111111000110110000111111";
break;
case 'f2l_sm' :
$mask = "000000000000110110000011011011111110000110110000011011";
break;
case 'f2l_1' :
$mask = "000000000000011011000110110110111111000111111000111111";
break;
case 'f2b' :
$mask = "000000000000111111000101101101101101000111111000101101";
break;
case 'line' :
$mask = "000000000000000000000010010010010010000000000000010010";
break;
case '2x2x2' :
$mask = "000000000000110110000011011011011000000000000000000000";
break;
case '2x2x3' :
$mask = "000000000000110110000111111111111000000011011000000000";
break;
}
}else if($dim == 2){
switch($stage){
case 'fl' :
$mask = "000000110011111100110011";
break;
case 'll' :
$mask = "111111001100000011001100";
break;
case 'oll' :
$mask = "111100000000111100000000";
break;
}
}
// Apply alg to mask if defined
if($mask && $st_rtn != ''){
require_once "cube_lib.php";
$mask = fcs_doperm($mask, fcs_format_alg($st_rtn), $dim);
}
// Apply mask to face def
if($mask){
for($i = 0; $i < $dim * $dim * 6; $i++){
$facelets[$i] = $mask[$i] == 0 ?
($view == 'trans' ? ($using_cols ? 't' : $T) :
($using_cols ? 'l' : $N)) : $facelets[$i];
}
}
}
// Retrieve alg def
if(array_key_exists('alg', $_REQUEST) || array_key_exists('case', $_REQUEST)
|| array_key_exists('alg', $DEFAULTS) || array_key_exists('case', $DEFAULTS)){
require_once "cube_lib.php";
if(array_key_exists('alg', $_REQUEST)) $alg = $_REQUEST['alg']; else $alg = $DEFAULTS['alg'];
if(array_key_exists('case', $_REQUEST)) $case = $_REQUEST['case']; else $case = $DEFAULTS['case'];
$alg = fcs_format_alg(urldecode($alg));
$case = invert_alg(fcs_format_alg(urldecode($case)));
// $facelets = facelet_cube(case_cube($alg), $dim, $facelets); // old 3x3 alg system
$facelets = fcs_doperm($facelets, $case . ' ' . $alg, $dim); // new NxN facelet permute
}
// Retrieve arrow defn's
if(array_key_exists('arw', $_REQUEST)){
$astr = preg_split('/,/', $_REQUEST['arw']);
$i = 0;
foreach($astr as $a){
$a_ = parse_arrow($a, $dim);
if($a_) $arrows[$i++] = $a_;
}
}
// Retrieve default arrow colour
$ac = $GREY;
if(array_key_exists('ac', $_REQUEST)){
$ac_ = parse_col($_REQUEST['ac']);
if($ac_ && $ac_ != 't') $ac = $ac_;
}
// ---------------[ 3D Cube Generator properties ]---------------
// Outline width
$OUTLINE_WIDTH = 0.94;
// Stroke width
$sw = 0;
// Viewport
$ox = -0.9;
$oy = -0.9;
$vw = 1.8;
$vh = 1.8;
// ------------------[ 3D Cube Generator ]-----------------------
// Set up cube for OLL view if specified
if($view == 'plan'){
$rtn = Array(Array(0, -90));
}
// All cube face points
$p = Array();
// Translation vector to centre the cube
$t = Array(-$dim/2, -$dim/2, -$dim/2);
// Translation vector to move the cube away from viewer
$zpos = Array(0, 0, $dist);
// Rotation vectors to track visibility of each face
$rv = Array(Array(0, -1, 0), Array(1, 0, 0), Array(0, 0, -1), Array(0, 1, 0), Array(-1, 0, 0), Array(0, 0, 1));
for($fc = 0; $fc < 6; $fc++){
for($i = 0; $i <= $dim; $i++){
for($j = 0; $j <= $dim; $j++){
switch($fc){
case $U : $p[$fc][$i][$j] = Array( $i, 0, $dim - $j); break;
case $R : $p[$fc][$i][$j] = Array( $dim, $j, $i); break;
case $F : $p[$fc][$i][$j] = Array( $i, $j, 0); break;
case $D : $p[$fc][$i][$j] = Array( $i, $dim, $j); break;
case $L : $p[$fc][$i][$j] = Array( 0, $j, $dim - $i); break;
case $B : $p[$fc][$i][$j] = Array($dim - $i, $j, $dim); break;
}
// Now scale and tranform point to ensure size/pos independent of dim
$p[$fc][$i][$j] = translate($p[$fc][$i][$j], $t);
$p[$fc][$i][$j] = scale($p[$fc][$i][$j], 1 / $dim);
// Rotate cube as per perameter settings
foreach($rtn as $rn){
$p[$fc][$i][$j] = rotate($p[$fc][$i][$j], $rn[0], M_PI * $rn[1]/180);
}
// Move cube away from viewer
$p[$fc][$i][$j] = translate($p[$fc][$i][$j], $zpos);
// Finally project the 3D points onto 2D
$p[$fc][$i][$j] = project($p[$fc][$i][$j], $zpos[2]);
}
}
// Rotate rotation vectors
foreach($rtn as $rn){
$rv[$fc] = rotate($rv[$fc], $rn[0], M_PI * $rn[1]/180);
}
}
// Sort render order (crappy bubble sort)
$ro = Array(0, 1, 2, 3, 4, 5);
for($i = 0; $i < 5; $i++){ for($j = 0; $j < 5; $j++){
if($rv[$ro[$j]][2] < $rv[$ro[$j+1]][2]){
$t = $ro[$j]; $ro[$j] = $ro[$j+1]; $ro[$j+1] = $t; }
}}
// Cube diagram SVG XML
$cube = "<?xml version='1.0' standalone='no'?>
<!DOCTYPE svg PUBLIC '-//W3C//DTD SVG 1.1//EN'
'http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd'>
<svg version='1.1' xmlns='http://www.w3.org/2000/svg'
width='$size' height='$size'
viewBox='$ox $oy $vw $vh'>\n";
// Draw background
if($bg) $cube .= "\t<rect fill='#$bg' x='$ox' y='$oy' width='$vw' height='$vh'/>\n";
// Transparancy background rendering
if($co < 100){
// Create polygon for each background facelet (transparency only)
$cube .= "\t<g style='opacity:".($fo/100).";stroke-opacity:0.5;stroke-width:$sw;stroke-linejoin:round'>\n";
for($ri = 0; $ri < 3; $ri++){
$cube .= facelet_svg($ro[$ri]);
}
$cube .= "\t</g>\n";
// Create outline for each background face (transparency only)
$cube .= "\t<g style='stroke-width:0.1;stroke-linejoin:round;opacity:".($co/100)."'>\n";
for($ri = 0; $ri < 3; $ri++)
$cube .= outline_svg($ro[$ri]);
$cube .= "\t</g>\n";
}
// Create outline for each visible face
$cube .= "\t<g style='stroke-width:0.1;stroke-linejoin:round;opacity:".($co/100)."'>\n";
for($ri = 3; $ri < 6; $ri++){
if(face_visible($ro[$ri], $rv) || $co < 100)
$cube .= outline_svg($ro[$ri]);
}
$cube .= "\t</g>\n";
// Create polygon for each visible facelet
$cube .= "\t<g style='opacity:".($fo/100).";stroke-opacity:0.5;stroke-width:$sw;stroke-linejoin:round'>\n";
for($ri = 3; $ri < 6; $ri++){
if(face_visible($ro[$ri], $rv) || $co < 100)
$cube .= facelet_svg($ro[$ri]);
}
$cube .= "\t</g>\n";
// Create OLL view guides
if($view == 'plan'){
$cube .= "\t<g style='opacity:".($fo/100).";stroke-opacity:1;stroke-width:0.02;stroke-linejoin:round'>\n";
$toRender = Array($F, $L, $B, $R);
foreach($toRender as $fc)
$cube .= oll_svg($fc);
$cube .= "\t</g>\n";
}
// Draw Arrows
if(isset($arrows)){
$awidth = 0.12 / $dim;
$cube .= "\t<g style='opacity:1;stroke-opacity:1;stroke-width:$awidth;stroke-linecap:round'>\n";
foreach($arrows as $i => $a){
$cube .= gen_arrow($i, $a[0], $a[1], $a[2], $a[4], array_key_exists(3, $a)?$a[3]:$ac);
}
$cube .= "\t</g>\n";
}
$cube .= "</svg>\n";
// Display cube
if($DEBUG) echo $cube;
else{
$img = $fmt != 'svg' ? convert($cube, $fmt, $size) : $cube;
display_img($img, $fmt);
// Cache image if enabled
if($ENABLE_CACHE && !array_key_exists("nocache", $_REQUEST) && strlen($img) < $CACHE_IMG_SIZE_LIMIT){
$req = mysqli_real_escape_string($mysql_con, $_SERVER['QUERY_STRING']);
$rfr = mysqli_real_escape_string($mysql_con, $_SERVER['HTTP_REFERER']);
$hash = md5($req);
$img = mysqli_real_escape_string($mysql_con, $img);
mysqli_query($mysql_con, "INSERT INTO vcache(hash, fmt, req, rfr, rcount, img) ".
"VALUES ('$hash', '$fmt', '$req', '$rfr', 1, '$img')");
// Disconnect from db
mysqli_close();
}
}
}
// -----------------[ User input functions ]----------------------
// Parse colour value
function parse_col($col){
global $NAME_COL, $ABBR_COL;
// As an abbriviation
if(preg_match('/^[ndlswyrogbpmt]$/', $col))
return $ABBR_COL[$col];
// As a name
if(array_key_exists($col, $NAME_COL))
return $NAME_COL[$col];
// As 12-bit colour
if(preg_match('/^[0-9a-fA-F]{3}$/', $col))
return $col[0].$col[0].$col[1].$col[1].$col[2].$col[2];
// As 24-bit colour
if(preg_match('/^[0-9a-fA-F]{6}$/', $col))
return $col;
// Otherwise fail
return null;
}
// Parse arrow definition
function parse_arrow($str, $dim){
$parts = preg_split('/-/', $str);
$fcodes = array('U' => 0, 'R' => 1, 'F' => 2, 'D' => 3, 'L' => 4, 'B' => 5);
if(count($parts) == 0) return null;
if(!preg_match_all('/([URFDLB])([0-9]+)/', $parts[0], $split) || count($split) < 2) return null;
$arrow = array();
$arrow[4] = 1;
for($i = 0; $i < 3; $i++){
if($i == 2 && count($split[1]) < 3){
$arrow[2] = null;
break;
}
else $arrow[2][3] = 2;
$arrow[$i][0] = $fcodes[$split[1][$i]];
$fn = $split[2][$i]; $fn = $fn >= $dim * $dim ? $dim * $dim - 1 : $fn;
$arrow[$i][1] = $fn % $dim;
$arrow[$i][2] = floor($fn / $dim);
}
// Parse remainder
for($i = 1; $i < count($parts); $i++){
if(preg_match('/^i[0-9]+$/', $parts[$i]) && $arrow[2]){
$arrow[2][3] = substr($parts[$i],1) / 5;
$arrow[2][3] = $arrow[2][3] > 10 ? 10 : $arrow[2][3]; // Var range = 0 to 50, default 10
}
else if(preg_match('/^s[0-9]+$/', $parts[$i])){
$arrow[4] = substr($parts[$i],1) / 10;
$arrow[4] = $arrow[4] > 2 ? 2 : $arrow[4]; // Var range = 0 to 20, default 10
}
else{
$ac_ = parse_col($parts[$i]);
if($ac_) $arrow[3] = $ac_;
}
}
return $arrow;
}
// Insert space in default fd/fc variables
function insert_space($in, $dim){
$out = '';
$dim *= $dim;
for($i = 0; $i < 6; $i++){
$out .= substr($in, $dim * $i, $dim) . ' ';
}
return $out;
}
// -------------------[ 3D Geometry Functions ]--------------------
// Move point by translation vector
function translate($p, $t){
$p[0] += $t[0];
$p[1] += $t[1];
$p[2] += $t[2];
return $p;
}
function scale($p, $f){
$p[0] *= $f;
$p[1] *= $f;
$p[2] *= $f;
return $p;
}
// Scale point relative to position vector
function trans_scale($p, $v, $f){
// Translate each facelet to cf
$iv = Array(-$v[0], -$v[1], -$v[2]);
return translate(scale(translate($p, $iv), $f), $v);
}
function rotate($p, $ax, $an){
$np = Array($p[0], $p[1], $p[2]);
switch($ax){
case 0 :
$np[2] = $p[2] * cos($an) - $p[1] * sin($an);
$np[1] = $p[2] * sin($an) + $p[1] * cos($an);
break;
case 1 :
$np[0] = $p[0] * cos($an) + $p[2] * sin($an);
$np[2] = - $p[0] * sin($an) + $p[2] * cos($an);
break;
case 2 :
$np[0] = $p[0] * cos($an) - $p[1] * sin($an);
$np[1] = $p[0] * sin($an) + $p[1] * cos($an);
break;
}
return $np;
}
// Project 3D points onto a 2D plane
function project($p, $d){
return Array(
$p[0] * $d / $p[2],
$p[1] * $d / $p[2],
$p[2] // Maintain z coordinate to allow use of rendering tricks
);
}
// Returns whether a face is visible
function face_visible($face, $rv){
return $rv[$face][2] < -0.105;
}
// ---------------------------[ Rendering Functions ]----------------------------
// Returns svg for a cube outline
function outline_svg($fc){
global $p, $dim, $cc, $OUTLINE_WIDTH;
return "\t\t<polygon fill='#$cc' stroke='#$cc' points='".
$p[$fc][ 0][ 0][0]*$OUTLINE_WIDTH.','.$p[$fc][ 0][ 0][1]*$OUTLINE_WIDTH.' '.
$p[$fc][$dim][ 0][0]*$OUTLINE_WIDTH.','.$p[$fc][$dim][ 0][1]*$OUTLINE_WIDTH.' '.
$p[$fc][$dim][$dim][0]*$OUTLINE_WIDTH.','.$p[$fc][$dim][$dim][1]*$OUTLINE_WIDTH.' '.
$p[$fc][ 0][$dim][0]*$OUTLINE_WIDTH.','.$p[$fc][ 0][$dim][1]*$OUTLINE_WIDTH."'/>\n";
}
// Returns svg for a faces facelets
function facelet_svg($fc){
global $p, $dim;
$svg = '';
for($i = 0; $i < $dim; $i++){
for($j = 0; $j < $dim; $j++){
// Find centre point of facelet
$cf = Array(($p[$fc][$j ][$i ][0] + $p[$fc][$j+1][$i+1][0])/2,
($p[$fc][$j ][$i ][1] + $p[$fc][$j+1][$i+1][1])/2, 0);
// Scale points in towards centre
$p1 = trans_scale($p[$fc][$j ][$i ], $cf, 0.85);
$p2 = trans_scale($p[$fc][$j+1][$i ], $cf, 0.85);
$p3 = trans_scale($p[$fc][$j+1][$i+1], $cf, 0.85);
$p4 = trans_scale($p[$fc][$j ][$i+1], $cf, 0.85);
// Generate facelet polygon
$svg .= gen_facelet($p1, $p2, $p3, $p4, $fc * $dim * $dim + $i * $dim + $j);
}
}
return $svg;
}
// Renders the top rim of the R U L and B faces out from side of cube
function oll_svg($fc){
global $p, $dim, $rv;
$svg = '';
// Translation vector, to move faces out
$tv1 = scale($rv[$fc], 0.00);
$tv2 = scale($rv[$fc], 0.20);
$i = 0;
for($j = 0; $j < $dim; $j++){
// Find centre point of facelet
$cf = Array(($p[$fc][$j ][$i ][0] + $p[$fc][$j+1][$i+1][0])/2,
($p[$fc][$j ][$i ][1] + $p[$fc][$j+1][$i+1][1])/2, 0);
// Scale points in towards centre and skew
$p1 = translate(trans_scale($p[$fc][$j ][$i ], $cf, 0.94), $tv1);
$p2 = translate(trans_scale($p[$fc][$j+1][$i ], $cf, 0.94), $tv1);
$p3 = translate(trans_scale($p[$fc][$j+1][$i+1], $cf, 0.94), $tv2);
$p4 = translate(trans_scale($p[$fc][$j ][$i+1], $cf, 0.94), $tv2);
// Generate facelet polygon
$svg .= gen_facelet($p1, $p2, $p3, $p4, $fc * $dim * $dim + $i * $dim + $j);
}
return $svg;
}
/** Generates a polygon SVG tag for cube facelets */
function gen_facelet($p1, $p2, $p3, $p4, $seq){
global $ABBR_COL, $facelets, $scheme, $using_cols, $cc, $T;
$fcol = $using_cols ? ($facelets[$seq] == 't' ? 't' : $ABBR_COL[$facelets[$seq]])
: ($facelets[$seq] == $T ? 't' : $scheme[$facelets[$seq]]);
return "\t\t<polygon fill='#".
($fcol == 't' ? '000000' : $fcol)."' stroke='#$cc' ".
($fcol == 't' ? "opacity='0' " : ' ' )."points='".
$p1[0].','.$p1[1].' '.
$p2[0].','.$p2[1].' '.
$p3[0].','.$p3[1].' '.
$p4[0].','.$p4[1]."'/>\n";
}
// Generates svg for an arrow pointing from sticker s1 to s2
function gen_arrow($id, $s1, $s2, $sv, $sc, $col){
global $p, $dim;
if($col == 't') return;
// Find centre point of each facelet
$p1 = Array(($p[$s1[0]][$s1[1]][$s1[2]][0] + $p[$s1[0]][$s1[1]+1][$s1[2]+1][0])/2,
($p[$s1[0]][$s1[1]][$s1[2]][1] + $p[$s1[0]][$s1[1]+1][$s1[2]+1][1])/2, 0);
$p2 = Array(($p[$s2[0]][$s2[1]][$s2[2]][0] + $p[$s2[0]][$s2[1]+1][$s2[2]+1][0])/2,
($p[$s2[0]][$s2[1]][$s2[2]][1] + $p[$s2[0]][$s2[1]+1][$s2[2]+1][1])/2, 0);
// Find midpoint between p1 and p2
$cp = Array(($p1[0] + $p2[0])/2, ($p1[1] + $p2[1])/2, 0);
// Shorten arrows towards midpoint according to config
$p1 = trans_scale($p1, $cp, $sc);
$p2 = trans_scale($p2, $cp, $sc);
if($sv){
$pv = Array(($p[$sv[0]][$sv[1]][$sv[2]][0] + $p[$sv[0]][$sv[1]+1][$sv[2]+1][0])/2,
($p[$sv[0]][$sv[1]][$sv[2]][1] + $p[$sv[0]][$sv[1]+1][$sv[2]+1][1])/2, 0);
// Project via point double dist from centre point
$pv = trans_scale($pv, $cp, $sv[3]);
}
// Calculate arrow rotation
$p_ = $sv ? $pv : $p1;
$rt = $p_[1] > $p2[1] ? 270 : 90;
if($p2[0]-$p_[0] != 0){
$rt = rad2deg(atan(($p2[1]-($p_[1]))/($p2[0]-$p_[0])));
$rt = ($p_[0] > $p2[0]) ? $rt + 180 : $rt;
}
return ' <path d="M '.$p1[0].','.$p1[1].' '.(isset($pv)?'Q '.$pv[0].','.$pv[1]:'L').' '.$p2[0].','.$p2[1].'"
style="fill:none;stroke:#'.$col.';stroke-opacity:1" />
<path transform=" translate('.$p2[0].','.$p2[1].') scale('.(0.033 / $dim).') rotate('.$rt.')"
d="M 5.77,0.0 L -2.88,5.0 L -2.88,-5.0 L 5.77,0.0 z"
style="fill:#'.$col.';stroke-width:0;stroke-linejoin:round"/>'."\n";
}
/** Converts svg into given format */
function convert($svg, $fmt, $size) {
global $CONVERT;
$opts = gen_image_opts($fmt, $size, "svg:-", "$fmt:-");
$descriptorspec = array(0 => array("pipe", "r"), 1 => array("pipe", "w"));
$convert = proc_open("$CONVERT $opts", $descriptorspec, $pipes);
fwrite($pipes[0], $svg);
fclose($pipes[0]);
$img = null;
while(!feof($pipes[1])) {
$img .= fread($pipes[1], 1024);
}
fclose($pipes[1]);
proc_close($convert);
return $img;
}
/** Alternative version using files rather than pipes,
not desired because of collision possibilities.. */
function convert_file($svg, $fmt, $size) {
global $CONVERT;
$svgfile = fopen("/tmp/visualcube.svg", 'w');
fwrite($svgfile, $svg);
fclose($svgfile);
$opts = gen_image_opts($fmt, $size, '/tmp/visualcube.svg', "/tmp/visualcube.$fmt");
$rsvg = exec("$CONVERT $opts");
$imgfile = fopen("/tmp/visualcube.$fmt", 'r');
$img = null;
while($imgfile and !feof($imgfile)) {
$img .= fread($imgfile, 1024);
}
fclose($imgfile);
return $img;
}
/** Generate ImageMagick options depending on format */
function gen_image_opts($fmt, $size, $infile, $outfile){
$inopts = ' -density 600 -resize '.$size.'x'.$size;
$outopts = ' -channel RGBA -alpha set';
// $opts .= '+label "Generated by VisualCube"';
// $opts .= ' -comment "Generated by VisualCube"';
// $opts .= ' -caption "Generated by VisualCube"';
// $opts = "-gaussian 1";
switch($fmt){
case 'png' : $inopts .= " -background none"; $outopts .= " -quality 100 -define png:format=png32";
break;
case 'gif' : $inopts .= " -background none";
break;
case 'ico' : $inopts .= " -background none";
break;
case 'jpg' : $outopts .= " -quality 90";
break;
}
return "$inopts $infile $outopts $outfile";
}
/** Sends image to browser */
function display_img($img, $fmt){
$mime = $fmt;
switch($fmt){
case 'jpe' :
case 'jpg' : $mime = 'jpeg'; break;
case 'svg' : $mime = 'svg+xml'; break;
case 'ico' : $mime = 'vnd.microsoft.icon'; break;
}
header("Content-type: image/$mime");
// header("Content-Length: " . filesize($img) ."; ");
echo $img;
}
// -----------------------------[ DB Access Functions ]--------------------------
// Return result of sql query as array
function get_arrays($mysql_con, $query){
$result = mysqli_query($mysql_con, $query);
$count = mysqli_num_rows($result);
if($count <= 0) return null;
$ary = Array($count);
$i = 0;
while($record = mysqli_fetch_array($result, MYSQLI_ASSOC)){
$ary[$i] = $record;
$i++;
}
return $ary;
}
?>