fix optional output args in python

oh arg we have to return a dict

also, test hough circle and line, and add maxpos/minpos

TODO

@@ -1,12 +1,6 @@
 
 - python:
 
-	- maxpos?
-
-	  perhaps:
-
-	  	v, x, y = im.max(x = True, y = True)
-
 	- could import like this:
 
 		from gi.repository import Vips 

python/test_arithmetic.py

@@ -1,7 +1,6 @@
 #!/usr/bin/python
 
 import unittest
-import gc
 
 #import logging
 #logging.basicConfig(level = logging.DEBUG)
@@ -359,12 +358,34 @@ class TestArithmetic(unittest.TestCase):
             self.assertEqual(hist.bands, 1)
 
     def test_hough_circle(self):
-        im = Vips.Image.black(100, 100).draw_circle(100, 50, 50, 40)
+        test = Vips.Image.black(100, 100).draw_circle(100, 50, 50, 40)
 
+        for fmt in all_formats:
+            im = test.cast(fmt)
             hough = im.hough_circle(min_radius = 35, max_radius = 45)
 
+            v, x, y = hough.maxpos()
+            vec = hough.getpoint(x, y)
+            r = vec.index(v) + 35
 
+            self.assertAlmostEqual(x, 50)
+            self.assertAlmostEqual(y, 50)
+            self.assertAlmostEqual(r, 40)
 
+    def test_hough_line(self):
+        test = Vips.Image.black(100, 100).draw_line(100, 10, 90, 90, 10)
+
+        for fmt in all_formats:
+            im = test.cast(fmt)
+            hough = im.hough_line()
+            
+            v, x, y = hough.maxpos()
+
+            angle = 360.0 * x / hough.width 
+            distance = test.height * y / hough.height
+
+            self.assertAlmostEqual(angle, 45)
+            self.assertAlmostEqual(distance, 70)
 
 if __name__ == '__main__':
     unittest.main()

python/vips8/vips.py

@@ -199,9 +199,12 @@ def _call_base(name, required, optional, self = None, option_string = None):
         if x.flags & enm.INPUT and x.flags & enm.MODIFY:
             out.append(x.get_value())
 
+    out_dict = {}
     for x in optional.keys():
         if x in optional_output:
-            out.append(optional_output[x].get_value())
+            out_dict[x] = optional_output[x].get_value()
+    if out_dict != {}:
+        out.append(out_dict)
 
     if len(out) == 1:
         out = out[0]
@@ -304,6 +307,18 @@ def vips_image_write_to_buffer(self, vips_filename, **kwargs):
 def vips_bandsplit(self):
     return [self.extract_band(i) for i in range(0, self.bands)]
 
+def vips_maxpos(self):
+    v, opts = self.max(x = True, y = True)
+    x = opts['x']
+    y = opts['y']
+    return v, x, y
+
+def vips_minpos(self):
+    v, opts = self.min(x = True, y = True)
+    x = opts['x']
+    y = opts['y']
+    return v, x, y
+
 # apply a function to a thing, or map over a list
 # we often need to do something like (1.0 / other) and need to work for lists
 # as well as scalars
@@ -480,6 +495,8 @@ Vips.Image.write_to_buffer = vips_image_write_to_buffer
 # a few useful things
 Vips.Image.floor = vips_floor
 Vips.Image.bandsplit = vips_bandsplit
+Vips.Image.maxpos = vips_maxpos
+Vips.Image.minpos = vips_minpos
 Vips.Image.real = vips_real
 Vips.Image.imag = vips_imag
 Vips.Image.polar = vips_polar