[TASK] Wrote classes and implemented about 50% of the whole idea.
This commit is contained in:
Jan Philipp Timme
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bc5b7aeabd
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<?php
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/**
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* This class will create a square png according to a given size and fill it with pixels.
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* @author JPT
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*/
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class BoxImage {
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/**
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* @var resource
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*/
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protected $image;
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/**
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* @var int
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*/
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protected $width;
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/**
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* @var int
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*/
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protected $height;
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/**
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* @var int
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*/
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protected $pointer_x;
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/**
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* @var int
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*/
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protected $pointer_y;
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/**
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* Basic constructor.
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* @param int $size
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* @return void
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* @throws Exception
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*/
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public function __construct($size) {
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if($size < 1) throw new Exception("This cannot be done!");
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//determine width+height
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$this->height = ceil(sqrt($size));
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$this->width = $this->height;
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//prepare image for PNG with transparency using the calculated size.
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$this->image = imagecreatetruecolor($this->width, $this->height);
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//set the alpha stuff
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imagesavealpha($this->image, TRUE);
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imagealphablending($this->image, FALSE);
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//initialize pointers.
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$this->resetPointer();
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}
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/**
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* Resets pointer.
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* @return void
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*/
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public function resetPointer() {
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$this->pointer_x = 0;
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$this->pointer_y = 0;
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}
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/**
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* Fills the image with the given color.
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* @param int $r 0 - 255
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* @param int $g 0 - 255
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* @param int $b 0 - 255
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* @param int $a 127 - 0
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* @return void
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*/
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public function fillImage($r, $g, $b, $a) {
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$color = imagecolorallocatealpha($this->image, $r, $g, $b, $a);
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imagefill($this->image, 0, 0, $color);
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imagecolordeallocate($this->image, $color);
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}
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/**
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* Sets the current pixel to the given color, moves the "pointer" of the image.
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* @param int $r 0 - 255
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* @param int $g 0 - 255
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* @param int $b 0 - 255
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* @param int $a 127 - 0
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* @return void
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*/
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public function setCurrentPixel($r, $g, $b, $a) {
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$color = imagecolorallocatealpha($this->image, $r, $g, $b, $a);
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imagesetpixel($this->image, $this->pointer_x, $this->pointer_y, $color);
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imagecolordeallocate($this->image, $color);
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}
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/**
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* Moves the x and y pointers of the image according to the offset.
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* @param int $offset
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* @throws Exception
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* @return void
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*/
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public function movePointer($offset) {
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if($offset === 0) return;
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if($offset > 0) $step = 1;
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if($offset < 0){
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$step = -1;
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$offset = $offset * -1;
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}
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if(!isset($step)) throw new Exception("What the fuck?");
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for($i = $offset; $i > 0; $i--) {
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//if we go back
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if($step === -1) {
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//decrease x-pointer
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$this->pointer_x--;
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//handle y-jumps
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if($this->pointer_x === 0) {
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$this->pointer_x = $width;
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$this->pointer_y--;
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//out of range?
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if($this->pointer_y < 0) throw new Exception("Out of range! (width)");
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}
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//if we go forward
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} elseif($step === 1) {
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//increase x-pointer
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$this->pointer_x++;
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//handle y-jumps
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if($this->pointer_x === $this->width) {
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$this->pointer_x = 0;
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$this->pointer_y++;
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//out of range?
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if($this->pointer_y > $this->height) throw new Exception("Out of range! (height)");
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}
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} //end of if
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} //end of for
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} //end of function
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/**
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* Writes the PNG to a file.
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* @param string $filename
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* @param int $compression 0-9
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* @return boolean
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*/
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public function writeToFile($filename, $compression) {
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return imagepng($this->image, $filename, $compression);
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}
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}
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@ -0,0 +1,50 @@
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<?php
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/**
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* This class contains some library-functions for converting a string to a color [depending on certain modes].
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* @author JPT
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*/
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class CharColorConverter {
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/**
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* Returns an array with RGB for the corresponding index.
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* @param int $index Index from 0 to 1530. (Everything above will result the same)
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* @return array
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* TODO: Function to reverse this one.
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* NOTICE: I will use 0 - 1275 for human readability;
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*/
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protected function index2rgb($index = 0) {
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$r = 255;
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$g = 0;
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$b = 0;
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//the elseif fixes a glitch.
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for($i = 0; $i < $index; $i++) {
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if($r < 255 && $g === 0 && $b === 255) $r++;
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elseif($r === 255 && $g < 255 && $b === 0) $g++;
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elseif($r === 0 && $g === 255 && $b < 255) $b++;
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elseif($r > 0 && $g === 255 && $b === 0) $r--;
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elseif($r === 0 && $g > 0 && $b === 255) $g--;
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elseif($r === 255 && $g === 0 && $b > 0) $b--;
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//DEBUG
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//$k = $i + 1;
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//echo "I:$k\t$r,$g,$b\r\n";
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}
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return array($r, $g, $b);
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}
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/**
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* Converts a single char to a string.
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* @param string $string
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* @return array RGB
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*/
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public function charToColor($string) {
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if(strlen($string) === 0) throw new Exception("Empty string given!");
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$index = ord($string) * 5;
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$color = $this->index2rgb($index);
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return $color;
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}
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}
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?>
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@ -1,6 +1,9 @@
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<?php
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require "val2rgb.php";
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$file = $argv[1];
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if(file_exists($file) === FALSE) die("Nein\n");
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if(file_exists($file) === FALSE) die("Error: file does not exist!\n");
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$data = file_get_contents($file);
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$size = strlen($data);
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$foobar = array();
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@ -0,0 +1,104 @@
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<?php
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/**
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* This class will be able to convert a file into an image.
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* @author JPT
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*/
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class FileImageConverter {
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/**
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* @var BoxImage
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*/
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protected $image;
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/**
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* @var CharColorConverter
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*/
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protected $colorConverter;
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/**
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* Default constructor
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* @return void
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*/
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public function __construct() {
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$this->colorConverter = new CharColorConverter();
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}
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/**
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* Processes the given file, returns the filename of the resulting PNG-File.
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* @param string $filename
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* @return void
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* @throws Exception
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*/
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public function convertFile($filename) {
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if(file_exists($filename) === FALSE) throw new Exception("Invalid filename given!");
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//get file data
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$filesize = filesize($filename);
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$md5 = md5_file($filename);
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$new_filename = "result.png";
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$header = "";
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for($i = 0;$i < 255;$i += 5) {
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$header .= chr($i);
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}
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$header .= chr(0);
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$header .= $filesize;
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$header .= chr(0);
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$header .= $md5;
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//header done, now read the file content
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$content = file_get_contents($filename);
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//get size for the image
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$size = strlen($header) + 1 + $filesize;
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//create and prepare image
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$this->image = new BoxImage($size);
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$this->image->fillImage(0,0,0,127);
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//header first
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$this->addDataToImage($header);
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//magic pixel
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$this->image->setCurrentPixel(0,0,0,127);
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$this->image->movePointer(1);
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//content
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$this->addDataToImage($content);
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//save image
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$this->image->writeToFile($new_filename, 0);
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//clean up
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unset($this->image);
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}
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/**
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* Converts data and adds it to the image.
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* @param string $data
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* @return void
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*/
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protected function addDataToImage($data) {
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try {
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$strlen = strlen($data);
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for($i = 0;$i < $strlen; $i++) {
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$char = substr($data, $i, 1);
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//convert char to color
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list($r, $g, $b) = $this->colorConverter->charToColor($char);
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//set the pixel
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$this->image->setCurrentPixel($r, $g, $b, 0);
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//move the pointer
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$this->image->movePointer(1);
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}
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} catch (Exception $e) {
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//TODO: handle weird shit?
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echo "Caught Exception:\n";
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echo $e;
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}
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}
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}
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?>
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@ -0,0 +1,9 @@
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<?php
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require_once "CharColorConverter.class.php";
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require_once "BoxImage.class.php";
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require_once "FileImageConverter.class.php";
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$converter = new FileImageConverter();
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$converter->convertFile("test.jpg");
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?>
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27
val2rgb.php
27
val2rgb.php
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@ -1,27 +0,0 @@
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<?php
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$index = $argv[1];
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$r = 255;
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$g = 0;
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$b = 0;
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for($i = 0; $i < $index; $i++) {
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echo "I:$i\tR:$r G:$g B:$b \n";
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if($g === 0 && $b === 255 && $r < 255) $r++;
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if($b === 0 && $g === 255 && $r > 0) $r--;
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if($b === 0 && $r === 255 && $g < 255) $g++;
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if($r === 0 && $b === 255 && $g > 0) $g--;
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if($r === 0 && $g === 255 && $b < 255) $b++;
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if($g === 0 && $r === 255 && $b > 0) $b--;
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}
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echo "\n";
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print_r(array($i, $r, $g, $b));
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// 0 - 1527
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?>
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