148 lines
3.3 KiB
PHP
148 lines
3.3 KiB
PHP
<?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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$this->pointer_x -= 1;
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//handle y-jumps
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if($this->pointer_x < 0) {
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$this->pointer_x = $width;
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$this->pointer_y -= 1;
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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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$this->pointer_x += 1;
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//handle y-jumps
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if($this->pointer_x > $this->width) {
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$this->pointer_x = 0;
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$this->pointer_y += 1;
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//out of range?
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if($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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} |