Split Size into Size and Offset.

sky/examples/raw/painting.dart

Index: sky/examples/raw/painting.dart
diff --git a/sky/examples/raw/painting.dart b/sky/examples/raw/painting.dart
index 29d381a8605abe44767781d54f8cb0ecefe9e901..8d94b62b6449bf48ed0cc0ac38c4f64c4ff3986e 100644
--- a/sky/examples/raw/painting.dart
+++ b/sky/examples/raw/painting.dart
@@ -7,12 +7,13 @@ import 'dart:math' as math;
 import 'dart:typed_data';
 
 void beginFrame(double timeStamp) {
+  sky.Size size = new sky.Size(sky.view.width, sky.view.height);
   sky.PictureRecorder recorder = new sky.PictureRecorder();
-  Canvas canvas = new Canvas(recorder, sky.view.width, 200.0);
+  sky.Canvas canvas = new sky.Canvas(recorder, size);
 
   sky.Paint paint = new sky.Paint();
-  sky.Point mid = new sky.Point(sky.view.width / 2.0, sky.view.height / 2.0);
-  double radius = math.min(mid.x, mid.y);
+  sky.Point mid = size.center(sky.Point.origin);
+  double radius = size.shortestSide / 2.0;
 
   canvas.drawPaint(new sky.Paint()..color = const sky.Color(0xFFFFFFFF));
 
@@ -41,7 +42,7 @@ void beginFrame(double timeStamp) {
   ]);
   canvas.concat(scaleMatrix);
   paint.color = const sky.Color.fromARGB(128, 0, 255, 0);
-  canvas.drawCircle(0.0, 0.0, radius, paint);
+  canvas.drawCircle(sky.Point.origin, radius, paint);
 
   canvas.restore();
 
@@ -49,7 +50,7 @@ void beginFrame(double timeStamp) {
   var builder = new sky.LayerDrawLooperBuilder()
       ..addLayerOnTop(
           new sky.DrawLooperLayerInfo()
-            ..setOffset(const sky.Point(150.0, 0.0))
+            ..setOffset(const sky.Offset(150.0, 0.0))
             ..setColorMode(sky.TransferMode.src)
             ..setPaintBits(sky.PaintBits.all),
           (sky.Paint layerPaint) {
@@ -61,7 +62,7 @@ void beginFrame(double timeStamp) {
       })
       ..addLayerOnTop(
           new sky.DrawLooperLayerInfo()
-            ..setOffset(const sky.Point(75.0, 75.0))
+            ..setOffset(const sky.Offset(75.0, 75.0))
             ..setColorMode(sky.TransferMode.src)
             ..setPaintBits(sky.PaintBits.shader),
           (sky.Paint layerPaint) {
@@ -75,13 +76,13 @@ void beginFrame(double timeStamp) {
             sky.BlurStyle.normal, 50.0, highQuality: true));
       })
       ..addLayerOnTop(
-          new sky.DrawLooperLayerInfo()..setOffset(const sky.Point(225.0, 75.0)),
+          new sky.DrawLooperLayerInfo()..setOffset(const sky.Offset(225.0, 75.0)),
           (sky.Paint layerPaint) {
         // Since this layer uses a DST color mode, this has no effect.
         layerPaint.color = const sky.Color.fromARGB(128, 255, 0, 0);
       });
   paint.setDrawLooper(builder.build());
-  canvas.drawCircle(0.0, 0.0, radius, paint);
+  canvas.drawCircle(sky.Point.origin, radius, paint);
 
   sky.view.picture = recorder.endRecording();
 }