From 7c6c7be2badd62d738941f79df4300aa18547179 Mon Sep 17 00:00:00 2001
From: Oliver Vogel <oliver@olivervogel.com>
Date: Fri, 5 Nov 2021 17:13:27 +0000
Subject: [PATCH] PlaceModifier

---
 src/Drivers/Gd/Modifiers/PlaceModifier.php    | 65 +++++++++++++++++++
 .../Imagick/Modifiers/PlaceModifier.php       | 58 +++++++++++++++++
 src/Geometry/Size.php                         | 15 +++++
 .../Gd/Modifiers/PlaceModifierTest.php        | 22 +++++++
 .../Imagick/Modifiers/PlaceModifierTest.php   | 22 +++++++
 5 files changed, 182 insertions(+)
 create mode 100644 src/Drivers/Gd/Modifiers/PlaceModifier.php
 create mode 100644 src/Drivers/Imagick/Modifiers/PlaceModifier.php
 create mode 100644 tests/Drivers/Gd/Modifiers/PlaceModifierTest.php
 create mode 100644 tests/Drivers/Imagick/Modifiers/PlaceModifierTest.php

diff --git a/src/Drivers/Gd/Modifiers/PlaceModifier.php b/src/Drivers/Gd/Modifiers/PlaceModifier.php
new file mode 100644
index 00000000..059ac16c
--- /dev/null
+++ b/src/Drivers/Gd/Modifiers/PlaceModifier.php
@@ -0,0 +1,65 @@
+<?php
+
+namespace Intervention\Image\Drivers\Gd\Modifiers;
+
+use Intervention\Image\Drivers\Gd\Image;
+use Intervention\Image\Geometry\Point;
+use Intervention\Image\Interfaces\ImageInterface;
+use Intervention\Image\Interfaces\ModifierInterface;
+use Intervention\Image\Traits\CanResolveDriverClass;
+
+class PlaceModifier implements ModifierInterface
+{
+    use CanResolveDriverClass;
+
+    protected $element;
+    protected $position;
+    protected $offset_x;
+    protected $offset_y;
+
+    /**
+     * Create new modifier
+     *
+     */
+    public function __construct($element, string $position, int $offset_x, int $offset_y)
+    {
+        $this->element = $element;
+        $this->position = $position;
+        $this->offset_x = $offset_x;
+        $this->offset_y = $offset_y;
+    }
+
+    public function apply(ImageInterface $image): ImageInterface
+    {
+        $watermark = $this->decodeWatermark();
+        $position = $this->getPosition($image, $watermark);
+
+        foreach ($image as $frame) {
+            imagecopy(
+                $frame->getCore(),
+                $watermark->getFrame()->getCore(),
+                $position->getX(),
+                $position->getY(),
+                0,
+                0,
+                $watermark->width(),
+                $watermark->height()
+            );
+        }
+
+        return $image;
+    }
+
+    protected function decodeWatermark(): Image
+    {
+        return $this->resolveDriverClass('InputHandler')->handle($this->element);
+    }
+
+    protected function getPosition(Image $image, Image $watermark): Point
+    {
+        $image_size = $image->getSize()->align($this->position, $this->offset_x, $this->offset_y);
+        $watermark_size = $watermark->getSize()->align($this->position);
+
+        return $image_size->relativePosition($watermark_size);
+    }
+}
diff --git a/src/Drivers/Imagick/Modifiers/PlaceModifier.php b/src/Drivers/Imagick/Modifiers/PlaceModifier.php
new file mode 100644
index 00000000..e91714bc
--- /dev/null
+++ b/src/Drivers/Imagick/Modifiers/PlaceModifier.php
@@ -0,0 +1,58 @@
+<?php
+
+namespace Intervention\Image\Drivers\Imagick\Modifiers;
+
+use Imagick;
+use Intervention\Image\Drivers\Imagick\Image;
+use Intervention\Image\Geometry\Point;
+use Intervention\Image\Interfaces\ImageInterface;
+use Intervention\Image\Interfaces\ModifierInterface;
+use Intervention\Image\Traits\CanResolveDriverClass;
+
+class PlaceModifier implements ModifierInterface
+{
+    use CanResolveDriverClass;
+
+    protected $element;
+    protected $position;
+    protected $offset_x;
+    protected $offset_y;
+
+    public function __construct($element, string $position, int $offset_x, int $offset_y)
+    {
+        $this->element = $element;
+        $this->position = $position;
+        $this->offset_x = $offset_x;
+        $this->offset_y = $offset_y;
+    }
+
+    public function apply(ImageInterface $image): ImageInterface
+    {
+        $watermark = $this->decodeWatermark();
+        $position = $this->getPosition($image, $watermark);
+
+        foreach ($image as $frame) {
+            $frame->getCore()->compositeImage(
+                $watermark->getFrame()->getCore(),
+                Imagick::COMPOSITE_DEFAULT,
+                $position->getX(),
+                $position->getY()
+            );
+        }
+
+        return $image;
+    }
+
+    protected function decodeWatermark(): Image
+    {
+        return $this->resolveDriverClass('InputHandler')->handle($this->element);
+    }
+
+    protected function getPosition(Image $image, Image $watermark): Point
+    {
+        $image_size = $image->getSize()->align($this->position, $this->offset_x, $this->offset_y);
+        $watermark_size = $watermark->getSize()->align($this->position);
+
+        return $image_size->relativePosition($watermark_size);
+    }
+}
diff --git a/src/Geometry/Size.php b/src/Geometry/Size.php
index b2e4f71f..c1adef14 100644
--- a/src/Geometry/Size.php
+++ b/src/Geometry/Size.php
@@ -176,4 +176,19 @@ class Size implements SizeInterface
 
         return $this;
     }
+
+    /**
+     * Calculate the relative position to another Size
+     * based on the pivot point settings of both sizes.
+     *
+     * @param  Size   $size
+     * @return Point
+     */
+    public function relativePosition(Size $size): Point
+    {
+        $x = $this->getPivot()->getX() - $size->getPivot()->getX();
+        $y = $this->getPivot()->getY() - $size->getPivot()->getY();
+
+        return new Point($x, $y);
+    }
 }
diff --git a/tests/Drivers/Gd/Modifiers/PlaceModifierTest.php b/tests/Drivers/Gd/Modifiers/PlaceModifierTest.php
new file mode 100644
index 00000000..bd1d3e0b
--- /dev/null
+++ b/tests/Drivers/Gd/Modifiers/PlaceModifierTest.php
@@ -0,0 +1,22 @@
+<?php
+
+namespace Intervention\Image\Tests\Drivers\Gd\Modifiers;
+
+use Intervention\Image\Drivers\Gd\Image;
+use Intervention\Image\Drivers\Gd\Modifiers\PlaceModifier;
+use Intervention\Image\Geometry\Size;
+use Intervention\Image\Tests\TestCase;
+use Intervention\Image\Tests\Traits\CanCreateGdTestImage;
+
+class PlaceModifierTest extends TestCase
+{
+    use CanCreateGdTestImage;
+
+    public function testColorChange(): void
+    {
+        $image = $this->createTestImage('test.jpg');
+        $this->assertEquals('febc44', $image->pickColor(300, 25)->toHex());
+        $image->modify(new PlaceModifier(__DIR__ . '/../../../images/circle.png', 'top-right', 0, 0));
+        $this->assertEquals('32250d', $image->pickColor(300, 25)->toHex());
+    }
+}
diff --git a/tests/Drivers/Imagick/Modifiers/PlaceModifierTest.php b/tests/Drivers/Imagick/Modifiers/PlaceModifierTest.php
new file mode 100644
index 00000000..20e2f077
--- /dev/null
+++ b/tests/Drivers/Imagick/Modifiers/PlaceModifierTest.php
@@ -0,0 +1,22 @@
+<?php
+
+namespace Intervention\Image\Tests\Drivers\Imagick\Modifiers;
+
+use Intervention\Image\Drivers\Imagick\Image;
+use Intervention\Image\Drivers\Imagick\Modifiers\PlaceModifier;
+use Intervention\Image\Geometry\Size;
+use Intervention\Image\Tests\TestCase;
+use Intervention\Image\Tests\Traits\CanCreateImagickTestImage;
+
+class PlaceModifierTest extends TestCase
+{
+    use CanCreateImagickTestImage;
+
+    public function testColorChange(): void
+    {
+        $image = $this->createTestImage('test.jpg');
+        $this->assertEquals('fdbd42', $image->pickColor(300, 25)->toHex());
+        $image->modify(new PlaceModifier(__DIR__ . '/../../../images/circle.png', 'top-right', 0, 0));
+        $this->assertEquals('33260d', $image->pickColor(300, 25)->toHex());
+    }
+}