Add unit test for rendering interpolated line with no associated feature

qgis · Sep 21, 2021 · 5950326 · 5950326
1 parent 7d71baa
commit 5950326
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Showing 2 changed files with 39 additions and 2 deletions.
diff --git a/tests/src/python/test_qgsinterpolatedlinesymbollayers.py b/tests/src/python/test_qgsinterpolatedlinesymbollayers.py
@@ -14,10 +14,12 @@
 import qgis  # NOQA
 
 from qgis.testing import unittest
-from qgis.PyQt.QtCore import QDir
+from qgis.PyQt.QtCore import (QDir,
+                              QPointF)
 from qgis.PyQt.QtGui import (QImage,
                              QPainter,
-                             QColor)
+                             QColor,
+                             QPolygonF)
 from qgis.core import (QgsRenderChecker,
                        QgsInterpolatedLineSymbolLayer,
                        QgsInterpolatedLineWidth,
@@ -107,6 +109,41 @@ def testFixedColorFixedWidth(self):
 
         self.renderImage(interpolated_width, interpolated_color, 'interpolatedlinesymbollayer_1')
 
+    def testRenderNoFeature(self):
+        """ test that rendering a interpolated line outside of a map render works"""
+
+        interpolated_width = QgsInterpolatedLineWidth()
+        interpolated_color = QgsInterpolatedLineColor()
+
+        interpolated_width.setIsVariableWidth(False)
+        interpolated_width.setFixedStrokeWidth(5)
+        interpolated_color.setColor(QColor(255, 0, 0))
+        interpolated_color.setColoringMethod(QgsInterpolatedLineColor.SingleColor)
+
+        layer = QgsInterpolatedLineSymbolLayer()
+        layer.setExpressionsStringForWidth('5', '1')
+        layer.setExpressionsStringForColor('2', '6')
+        layer.setInterpolatedWidth(interpolated_width)
+        layer.setInterpolatedColor(interpolated_color)
+
+        symbol = QgsLineSymbol()
+        symbol.changeSymbolLayer(0, layer)
+
+        image = QImage(200, 200, QImage.Format_RGB32)
+        image.fill(QColor(255, 255, 255))
+        painter = QPainter(image)
+
+        context = QgsRenderContext.fromQPainter(painter)
+
+        symbol.startRender(context)
+
+        symbol.renderPolyline(QPolygonF([QPointF(30, 50), QPointF(100, 70), QPointF(150, 30)]), None, context)
+
+        symbol.stopRender(context)
+        painter.end()
+
+        self.assertTrue(self.imageCheck('interpolatedlinesymbollayer_no_feature', 'interpolatedlinesymbollayer_no_feature', image))
+
     def testVaryingColorFixedWidth(self):
         """ test that rendering a interpolated line with fixed width and varying color"""
 

diff --git a/...dlinesymbollayer_no_feature/expected_interpolatedlinesymbollayer_no_feature.png b/...dlinesymbollayer_no_feature/expected_interpolatedlinesymbollayer_no_feature.png