[sis] 03/03: Fix a `NullPointerException` that occurs when a new window is created.

[de...@apache.org]

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desruisseaux pushed a commit to branch geoapi-4.0
in repository https://gitbox.apache.org/repos/asf/sis.git

commit 7b07584b9d4e346312525ce4f1ab1b667e2e514d
Author: Martin Desruisseaux <ma...@geomatys.com>
AuthorDate: Fri Jan 15 00:19:08 2021 +0100

    Fix a `NullPointerException` that occurs when a new window is created.
---
 .../sis-javafx/src/main/java/org/apache/sis/gui/map/MapCanvas.java  | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/application/sis-javafx/src/main/java/org/apache/sis/gui/map/MapCanvas.java b/application/sis-javafx/src/main/java/org/apache/sis/gui/map/MapCanvas.java
index 7dc4d08..9675146 100644
--- a/application/sis-javafx/src/main/java/org/apache/sis/gui/map/MapCanvas.java
+++ b/application/sis-javafx/src/main/java/org/apache/sis/gui/map/MapCanvas.java
@@ -915,8 +915,12 @@ public abstract class MapCanvas extends PlanarCanvas {
              * This code is executed only once for a new map.
              */
             if (invalidObjectiveToDisplay) {
-                invalidObjectiveToDisplay = false;
                 final Envelope2D target = getDisplayBounds();
+                if (target == null) {
+                    // Bounds are still unknown. Another repaint event will happen when they will become known.
+                    return;
+                }
+                invalidObjectiveToDisplay = false;
                 final GridExtent extent = new GridExtent(null,
                         new long[] {Math.round(target.getMinX()), Math.round(target.getMinY())},
                         new long[] {Math.round(target.getMaxX()), Math.round(target.getMaxY())}, false);