9.1.0 Scale the image to align with the crop rect and make crop rect …

…as bigger as possible when rotate Image on Editor mode.(#713)

CHANGELOG.md

@@ -1,6 +1,7 @@
-## Unreleased
+## 9.1.0
 
 * Removed the `enableMemoryCache` variable in `ExtendedImage`,please Use `clearMemoryCacheWhenDispose` instead for managing memory cache behavior. 
+* Scale the image to align with the crop rect and make crop rect as bigger as possible when rotate Image on Editor mode.(#713)
 
 ## 9.0.9
 

lib/src/editor/crop_layer.dart

@@ -640,7 +640,15 @@ class ExtendedImageCropLayerState extends State<ExtendedImageCropLayer>
       );
 
       if (scaleDelta <= 0) {
-        return;
+        // make crop rect as bigger as possible
+        final double scaleDelta1 =
+            widget.editActionDetails.scaleToMatchRect(rectVertices, layoutRect);
+        if (scaleDelta1 != double.negativeInfinity &&
+            !scaleDelta1.equalTo(1.0)) {
+          scaleDelta = scaleDelta1;
+        } else {
+          return;
+        }
       }
 
       // not out of layout rect

lib/src/editor/edit_action_details.dart

@@ -265,6 +265,31 @@ class EditActionDetails {
         preTotalScale = totalScale;
         totalScale = totalScale * scaleDelta;
       }
+    } else {
+      // scale the image to align with the crop rect
+      final Matrix4 result = getTransform();
+      result.invert();
+      final Rect rect = _screenDestinationRect!;
+      final List<Offset> rectVertices = <Offset>[
+        screenCropRect!.topLeft,
+        screenCropRect!.topRight,
+        screenCropRect!.bottomRight,
+        screenCropRect!.bottomLeft,
+      ].map((Offset element) {
+        final Vector4 cornerVector = Vector4(element.dx, element.dy, 0.0, 1.0);
+        final Vector4 newCornerVector = result.transform(cornerVector);
+        return Offset(newCornerVector.x, newCornerVector.y);
+      }).toList();
+
+      final double scaleDelta = scaleToMatchRect(
+        rectVertices,
+        rect,
+      );
+      if (scaleDelta != double.negativeInfinity) {
+        screenFocalPoint = null;
+        preTotalScale = totalScale;
+        totalScale = totalScale * scaleDelta;
+      }
     }
   }
 
@@ -290,6 +315,28 @@ class EditActionDetails {
     return scaleDelta;
   }
 
+  double scaleToMatchRect(
+    List<Offset> rectVertices,
+    Rect rect,
+  ) {
+    double scaleDelta = double.negativeInfinity;
+    final Offset center = rect.center;
+    for (final Offset element in rectVertices) {
+      if (!rect.containsOffset(element)) {
+        continue;
+      }
+      final double x = (element.dx - center.dx).abs();
+      final double y = (element.dy - center.dy).abs();
+      final double halfWidth = rect.width / 2;
+      final double halfHeight = rect.height / 2;
+      if (x < halfWidth || y < halfHeight) {
+        scaleDelta = max(scaleDelta, max(x / halfWidth, y / halfHeight));
+      }
+    }
+
+    return scaleDelta;
+  }
+
   double scaleToFit(
     List<Offset> rectVertices,
     Rect rect,

pubspec.yaml

@@ -1,8 +1,14 @@
 name: extended_image
 description: Official extension image, support placeholder(loading)/ failed state, cache network, zoom/pan, photo view, slide out page, editor(crop,rotate,flip), painting etc.
-version: 9.0.9
+version: 9.1.0
 repository: https://github.com/fluttercandies/extended_image
 issue_tracker: https://github.com/fluttercandies/extended_image/issues
+topics:
+  - image
+  - cropper
+  - photo-view
+  - editor
+  - slide-out
 
 environment:
   sdk: '>=2.18.0 <4.0.0'