fix some apis

lib/components/component.dart

@@ -29,20 +29,20 @@ abstract class PositionComponent extends Component {
   double x = 0.0, y = 0.0, angle = 0.0;
   double width = 0.0, height = 0.0;
 
-  Position get position => new Position(x, y);
+  Position toPosition() => new Position(x, y);
-  void set position(Position position) {
+  void setByPosition(Position position) {
     this.x = position.x;
     this.y = position.y;
   }
 
-  Position get size => new Position(width, height);
+  Position toSize() => new Position(width, height);
-  void set size(Position size) {
+  void setBySize(Position size) {
     this.width = size.x;
     this.height = size.y;
   }
 
-  Rect get rect => new Rect.fromLTWH(x, y, width, height);
+  Rect toRect() => new Rect.fromLTWH(x, y, width, height);
-  void set rect(Rect rect) {
+  void setByRect(Rect rect) {
     this.x = rect.left;
     this.y = rect.top;
     this.width = rect.width;
@@ -50,7 +50,7 @@ abstract class PositionComponent extends Component {
   }
 
   double angleBetween(PositionComponent c) {
-    return (atan2(c.x - this.x, this.y - c.y) - PI / 2) % (2 * PI);
+    return (atan2(c.x - this.x, this.y - c.y) - pi / 2) % (2 * pi);
   }
 
   double distance(PositionComponent c) {

lib/game.dart

@@ -45,7 +45,7 @@ class GameRenderBox extends RenderBox {
 
   int _frameCallbackId;
 
-  Duration previous = Duration.ZERO;
+  Duration previous = Duration.zero;
 
   GameRenderBox(this.context, this.game);
 
@@ -91,11 +91,11 @@ class GameRenderBox extends RenderBox {
 
   double _computeDeltaT(Duration now) {
     Duration delta = now - previous;
-    if (previous == Duration.ZERO) {
+    if (previous == Duration.zero) {
-      delta = Duration.ZERO;
+      delta = Duration.zero;
     }
     previous = now;
-    return delta.inMicroseconds / Duration.MICROSECONDS_PER_SECOND;
+    return delta.inMicroseconds / Duration.microsecondsPerSecond;
   }
 
   @override

lib/position.dart

@@ -82,7 +82,7 @@ class Position {
 
   @override
   String toString() {
-    return "($x, $y)";
+    return '($x, $y)';
   }
 
   static ui.Rect rectFrom(Position topLeft, Position size) {

lib/sprite.dart

@@ -1,4 +1,5 @@
 import 'dart:ui';
+import 'dart:async';
 
 import 'package:flame/position.dart';
 import 'package:flame/flame.dart';
@@ -10,10 +11,6 @@ class Sprite {
 
   static final Paint paint = new Paint()..color = Colors.white;
 
-  Sprite.fromImage(this.image) {
-    this.src = new Rect.fromLTWH(0.0, 0.0, image.width.toDouble(), image.height.toDouble());
-  }
-
   Sprite(String fileName, {double x = 0.0, double y = 0.0, double width = -1.0, double height = -1.0}) {
     Flame.images.load(fileName).then((img) {
       if (width == -1.0) {
@@ -27,6 +24,21 @@ class Sprite {
     });
   }
 
+  Sprite.fromImage(this.image, {double x = 0.0, double y = 0.0, double width = -1.0, double height = -1.0}) {
+      if (width == -1.0) {
+        width = image.width.toDouble();
+      }
+      if (height == -1.0) {
+        height = image.height.toDouble();
+      }
+      this.src = new Rect.fromLTWH(x, y, width, height);
+  }
+
+  static Future<Sprite> loadSprite(String fileName, {double x = 0.0, double y = 0.0, double width = -1.0, double height = -1.0}) async {
+    Image image = await Flame.images.load(fileName);
+    return new Sprite.fromImage(image, x: x, y: y, width: width, height: height);
+  }
+
   bool loaded() {
     return image != null && src != null;
   }

pubspec.yaml

@@ -11,11 +11,11 @@ dependencies:
   flutter:
     sdk: flutter
   audioplayers: ^0.4.1
-  path_provider: ^0.2.1+1
+  path_provider: ^0.4.0
   box2d: ^0.4.0
 
 dev_dependencies:
-  test: 0.12.24+8
+  test: ^0.12.34
 
 environment:
   sdk: ">=1.13.0 <2.0.0"

test/component_test.dart

@@ -10,10 +10,10 @@ void main() {
       PositionComponent c = new SpriteComponent();
       c.x = 2.2;
       c.y = 3.4;
-      expect(c.position.x, 2.2);
+      expect(c.toPosition().x, 2.2);
-      expect(c.position.y, 3.4);
+      expect(c.toPosition().y, 3.4);
 
-      c.position = new Position(1.0, 0.0);
+      c.setByPosition(new Position(1.0, 0.0));
       expect(c.x, 1.0);
       expect(c.y, 0.0);
     });
@@ -22,10 +22,10 @@ void main() {
       PositionComponent c = new SpriteComponent();
       c.width = 2.2;
       c.height = 3.4;
-      expect(c.size.x, 2.2);
+      expect(c.toSize().x, 2.2);
-      expect(c.size.y, 3.4);
+      expect(c.toSize().y, 3.4);
 
-      c.size = new Position(1.0, 0.0);
+      c.setBySize(new Position(1.0, 0.0));
       expect(c.width, 1.0);
       expect(c.height, 0.0);
     });
@@ -36,12 +36,12 @@ void main() {
       c.y = 1.0;
       c.width = 2.0;
       c.height = 2.0;
-      expect(c.rect.left, 0.0);
+      expect(c.toRect().left, 0.0);
-      expect(c.rect.top, 1.0);
+      expect(c.toRect().top, 1.0);
-      expect(c.rect.width, 2.0);
+      expect(c.toRect().width, 2.0);
-      expect(c.rect.height, 2.0);
+      expect(c.toRect().height, 2.0);
 
-      c.rect = new Rect.fromLTWH(10.0, 10.0, 1.0, 1.0);
+      c.setByRect(new Rect.fromLTWH(10.0, 10.0, 1.0, 1.0));
       expect(c.x, 10.0);
       expect(c.y, 10.0);
       expect(c.width, 1.0);

test/position_test.dart

@@ -27,7 +27,7 @@ void main() {
     });
 
     test('test rotate', () {
-      Position p = new Position(1.0, 0.0).rotate(math.PI / 2);
+      Position p = new Position(1.0, 0.0).rotate(math.pi / 2);
       expectDouble(p.x, 0.0);
       expectDouble(p.y, 1.0);
     });