From 593b8c1d1abc484f95c0bcc546b27d16427cba93 Mon Sep 17 00:00:00 2001
From: Guilhem Vellut <guilhem.vellut@gmail.com>
Date: Mon, 5 Mar 2018 13:03:25 +0100
Subject: [PATCH] Corrected computation of center

---
 freehandrastergeoreferencer_layer.py | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/freehandrastergeoreferencer_layer.py b/freehandrastergeoreferencer_layer.py
index bbcfa22..a0514d2 100644
--- a/freehandrastergeoreferencer_layer.py
+++ b/freehandrastergeoreferencer_layer.py
@@ -213,10 +213,12 @@ def initializeExistingGeoreferencing(self, dataset, georef):
         # assume georef only has translation and scaling
         # since rotation not supported by QGIS or ArcGIS
         self.setRotation(0.0)
-        center = QgsPointXY(georef[0], georef[3])
+        sx, sy = georef[1], georef[5]
+        center = QgsPointXY(georef[0] + sx * self.image.width() / 2,
+                            georef[3] + sy * self.image.height() / 2)
         self.setCenter(center)
         # keep yScale positive
-        self.setScale(georef[1], -georef[5])
+        self.setScale(sx, -sy)
         self.commitTransformParameters()
 
         crs_wkt = dataset.GetProjection()