Default srcSize

doc/examples/animation_widget/lib/main.dart

@@ -15,7 +15,7 @@ SpriteAnimation _animation;
 void main() async {
   WidgetsFlutterBinding.ensureInitialized();
   final image = await Flame.images.load('minotaur.png');
-  _sprite = Sprite(image, size: Vector2.all(96));
+  _sprite = Sprite(image, srcSize: Vector2.all(96));
 
   final _animationSpriteSheet = SpriteSheet(
     image: image,

doc/examples/isometric/lib/main.dart

@@ -25,7 +25,7 @@ class Selector extends SpriteComponent {
 
   Selector(double s, Image image)
       : super.fromSprite(
-            Vector2.all(s), Sprite(image, size: Vector2.all(32.0)));
+            Vector2.all(s), Sprite(image, srcSize: Vector2.all(32.0)));
 
   @override
   void render(Canvas canvas) {

lib/components/isometric_tile_map_component.dart

@@ -46,7 +46,7 @@ class IsometricTileset {
     final j = tileId ~/ columns;
     final s = size.toDouble();
     return Sprite(tileset,
-        srcPosition: Vector2(s * i, s * j), size: Vector2.all(s));
+        srcPosition: Vector2(s * i, s * j), srcSize: Vector2.all(s));
   }
 }
 

lib/sprite.dart

@@ -12,9 +12,9 @@ class Sprite {
   Sprite(
     this.image, {
     Vector2 srcPosition,
-    Vector2 size,
+    Vector2 srcSize,
   }) : assert(image != null, "image can't be null") {
-    size ??= Vector2(image.width.toDouble(), image.height.toDouble());
+    this.srcSize = srcSize;
     this.srcPosition = srcPosition;
   }
 
@@ -26,7 +26,12 @@ class Sprite {
 
   Vector2 get srcSize => Vector2(src.width, src.height);
 
-  Vector2 get srcPosition => src.topLeft.toVector2();
+  set srcSize(Vector2 size) {
+    size ??= Vector2(image.width.toDouble(), image.height.toDouble());
+    src = (srcPosition ?? Vector2.zero()).toPositionedRect(size);
+  }
+
+  Vector2 get srcPosition => (src?.topLeft ?? Offset.zero).toVector2();
 
   set srcPosition(Vector2 position) {
     src = (position ?? Vector2.zero()).toPositionedRect(srcSize);
@@ -43,8 +48,12 @@ class Sprite {
     double scale = 1.0,
     Paint overridePaint,
   }) {
-    renderPosition(canvas, p,
-        size: srcSize * scale, overridePaint: overridePaint);
+    renderPosition(
+      canvas,
+      p,
+      size: srcSize * scale,
+      overridePaint: overridePaint,
+    );
   }
 
   void renderPosition(
@@ -53,7 +62,7 @@ class Sprite {
     Vector2 size,
     Paint overridePaint,
   }) {
-    size ??= this.srcSize;
+    size ??= srcSize;
     renderRect(canvas, p.toPositionedRect(size), overridePaint: overridePaint);
   }
 
@@ -62,7 +71,7 @@ class Sprite {
     Vector2 size,
     Paint overridePaint,
   }) {
-    size ??= this.srcSize;
+    size ??= srcSize;
     renderRect(canvas, size.toRect(), overridePaint: overridePaint);
   }
 
@@ -76,7 +85,7 @@ class Sprite {
     Vector2 size,
     Paint overridePaint,
   }) {
-    size ??= this.srcSize;
+    size ??= srcSize;
     renderRect(
       canvas,
       (p - size / 2).toPositionedRect(size),

lib/sprite_animation.dart

@@ -109,7 +109,7 @@ class SpriteAnimation {
       final Sprite sprite = Sprite(
         image,
         srcPosition: position,
-        size: textureSize,
+        srcSize: textureSize,
       );
       frames[i] = SpriteAnimationFrame(sprite, stepTimes[i]);
     }
@@ -138,7 +138,7 @@ class SpriteAnimation {
       final Sprite sprite = Sprite(
         image,
         srcPosition: Vector2Extension.fromInts(x, y),
-        size: Vector2Extension.fromInts(width, height),
+        srcSize: Vector2Extension.fromInts(width, height),
       );
 
       return SpriteAnimationFrame(sprite, stepTime);

lib/spritesheet.dart

@@ -42,7 +42,7 @@ class SpriteSheet {
     return Sprite(
       image,
       srcPosition: Vector2(x.toDouble(), y.toDouble())..multiply(size),
-      size: size,
+      srcSize: size,
     );
   }
 

lib/widgets/nine_tile_box.dart

@@ -19,7 +19,7 @@ class _Painter extends widgets.CustomPainter {
   });
 
   Sprite _getSpriteTile(double x, double y) =>
-      Sprite(image, srcPosition: Vector2(x, y), size: Vector2.all(tileSize));
+      Sprite(image, srcPosition: Vector2(x, y), srcSize: Vector2.all(tileSize));
 
   @override
   void paint(Canvas canvas, Size size) {