test draw_circle

seems to work!

Author: jcupitt

Diff for: CHANGELOG.md

@@ -7,6 +7,7 @@ All notable changes to `:vips` will be documented in this file.
 - Image::set and Image::get methods, handy for properties whose names do not
   confirm to PHP conventions
 - type annotations [Kleis Auke Wolthuizen]
+- libvips draw calls now work
 
 ### Deprecated
 - now require php >= 7.0.11, fixes #10

Diff for: README.md

@@ -86,7 +86,13 @@ to add 1 to the first band, 2 to the second and 3 to the third. Or:
 $image = $image->add($image2);
 ```
 
-to add two images. 
+to add two images. Or: 
+
+```
+$image = $image->add([[1, 2, 3], [4, 5, 6]]);
+```
+
+To make a 2 x 3 image from the array, then add that image to the original.
 
 Almost all methods can take an optional final argument, an array of options.
 For example:

Diff for: tests/call.php

@@ -34,4 +34,16 @@ public function testVipsCall2D()
         $this->assertEquals($image->getpoint(0, 0), [1]);
     }
 
+    public function testVipsDraw()
+    {
+        $image = Vips\Image::black(100, 100);
+        $image = $image->draw_circle(255, 50, 50, 20, ["fill" => true]);
+
+        $this->assertEquals($image->width, 100);
+        $this->assertEquals($image->height, 100);
+        $this->assertEquals($image->bands, 1);
+        $this->assertEquals($image->getpoint(0, 0), [0]);
+        $this->assertEquals($image->getpoint(50, 50), [255]);
+    }
+
 }