dynamic ascii art

1 files changed, 103 insertions, 0 deletions

diff --git a/web/Processor.php b/web/Processor.php
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index 0000000..b1bf0bf
--- /dev/null
+++ b/web/Processor.php
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+<?php
+/**
+ * The Processor class processes an image and prepares
+ * the color values needed for the ascii output.
+ *
+ * Its main job is to process each pixel, do color calculations and
+ * store an internal color array for later ascii output, which then is done
+ * by its helper Result classes.
+ *
+ * (c) 2016 Alex Schenkel
+ */
+namespace Img2Ascii;
+
+class Processor {
+    protected $imgPath;
+    protected $image;
+    protected $imageWidth;
+    protected $imageHeight;
+
+    protected $result;
+
+    public function __construct($pathOrImgres) {
+        if (is_file($pathOrImgres)) {
+            $this->imgPath = $pathOrImgres;
+            $this->image = imagecreatefromstring(file_get_contents($pathOrImgres));
+        } else {
+            $this->image = $pathOrImgres;
+        }
+        try {
+            $this->imageWidth = imagesx($this->image);
+            $this->imageHeight = imagesy($this->image);
+        } catch (\Exception $e) {
+            throw new \Exception("Image creation failed. Is the given resource a valid image?");
+        }
+    }
+
+    public function asciify($pixelWidth = 10) {
+        $charsX = floor($this->imageWidth / $pixelWidth);
+        return $this->asciifyToWidth($charsX);
+    }
+
+    public function asciifyToWidth($charsX) {
+        $charsX = (int)$charsX;
+        if (!$charsX) $charsX = floor($this->imageWidth / 10);
+        $this->result = null;
+
+        $blockWidth = $this->imageWidth / (float)$charsX;
+        $blockHeight = $blockWidth * 8.0/5.0;
+        $blockWidth = max(1,floor($blockWidth));
+        $blockHeight = max(1,floor($blockHeight));
+
+        $ascii = array();
+
+        for ($y = 0; $y < $this->imageHeight; $y += $blockHeight) {
+            for ($x = 0; $x < $this->imageWidth; $x += $blockWidth) {
+                $value = [0,0,0];
+                if ($x === 0) {
+                    $ascii[$y / $blockHeight] = array();
+                }
+                $counter = 0;
+                for ($innerY = $y; $innerY < $y + $blockHeight; $innerY++) {
+                    if ($innerY > $this->imageHeight-1) break;
+                    for ($innerX = $x; $innerX < $x + $blockWidth; $innerX++) {
+                        if ($innerX > $this->imageWidth-1) break;
+                        $counter++;
+                        $rgb = imagecolorat($this->image,$innerX, $innerY);
+                        $rgb = array($rgb >> 16, $rgb >> 8 & 255, $rgb & 255);
+                        $value[0] += $rgb[0];
+                        $value[1] += $rgb[1];
+                        $value[2] += $rgb[2];
+                    }
+                }
+                $value[0] = $value[0] / $counter;
+                $value[1] = $value[1] / $counter;
+                $value[2] = $value[2] / $counter;
+                $ascii[$y / $blockHeight][$x / $blockWidth] = $value;
+            }
+        }
+        $this->result = $ascii;
+        return $this;
+    }
+
+    protected function saturate($ascii) {
+        foreach($ascii as $y =>$line) {
+            foreach($line as $x => $value) {
+                $ascii[$y][$x] = $value[0]*1 + $value[1]*1 + $value[2]*1;
+            }
+        }
+        return $ascii;
+    }
+
+    public function colorResult($blockChar = '#') {
+        $res = new ColorResult($this->result);
+        $res->blockChar = $blockChar;
+        return $res;
+    }
+
+    public function result($symbols = "@%#*+=-:. ") {
+        $res = new BlackWhiteResult($this->saturate($this->result));
+        $res->symbols = $symbols;
+        return $res;
+    }
+}