Add weight chart to fitness app

examples/fitness/lib/feed.dart

@@ -173,28 +173,59 @@ class FeedFragment extends StatefulComponent {
     });
   }
 
+  Widget buildChart() {
+    double startX;
+    double endX;
+    double startY;
+    double endY;
+    List<Point> dataSet = new List<Point>();
+    for (FitnessItem item in userData) {
+      if (item is Measurement) {
+          double x = item.when.millisecondsSinceEpoch.toDouble();
+          double y = item.weight;
+          if (startX == null)
+            startX = x;
+          endX = x;
+          if (startY == null || startY > y)
+            startY = y;
+          if (endY == null || endY < y)
+            endY = y;
+          dataSet.add(new Point(x, y));
+      }
+    }
+    playfair.ChartData data = new playfair.ChartData(
+      startX: startX,
+      startY: startY,
+      endX: endX,
+      endY: endY,
+      dataSet: dataSet
+    );
+    return new playfair.Chart(data: data);
+  }
+
   Widget buildBody() {
     TextStyle style = Theme.of(this).text.title;
+    if (userData.length == 0)
+      return new Material(
+        type: MaterialType.canvas,
+        child: new Flex(
+          [new Text("No data yet.\nAdd some!", style: style)],
+          justifyContent: FlexJustifyContent.center
+        )
+      );
     switch (_fitnessMode) {
       case FitnessMode.feed:
-        if (userData.length > 0)
-          return new FitnessItemList(
-            items: userData,
-            onDismissed: _handleItemDismissed
-          );
-        return new Material(
-          type: MaterialType.canvas,
-          child: new Flex(
-            [new Text("No data yet.\nAdd some!", style: style)],
-            justifyContent: FlexJustifyContent.center
-          )
+        return new FitnessItemList(
+          items: userData,
+          onDismissed: _handleItemDismissed
         );
       case FitnessMode.chart:
         return new Material(
           type: MaterialType.canvas,
-          child: new Flex([
-            new Text("Charts are coming soon!", style: style)
-          ], justifyContent: FlexJustifyContent.center)
+          child: new Container(
+            padding: const EdgeDims.all(20.0),
+            child: buildChart()
+          )
         );
     }
   }

examples/fitness/lib/main.dart

@@ -4,6 +4,7 @@
 
 library fitness;
 
+import 'package:playfair/playfair.dart' as playfair;
 import 'package:sky/editing/input.dart';
 import 'package:sky/painting/text_style.dart';
 import 'package:sky/theme/colors.dart' as colors;

examples/fitness/pubspec.yaml

@@ -2,6 +2,7 @@ name: fitness
 dependencies:
   sky: any
   sky_tools: any
+  playfair: any
   path: "^1.3.6"
 dependency_overrides:
   material_design_icons:

sky/engine/core/core.gni

@@ -464,6 +464,8 @@ sky_core_files = [
   "painting/Size.cpp",
   "painting/Size.h",
   "painting/TransferMode.h",
+  "painting/Typeface.cpp",
+  "painting/Typeface.h",
   "rendering/BidiRun.h",
   "rendering/BidiRunForLine.cpp",
   "rendering/BidiRunForLine.h",
@@ -682,6 +684,7 @@ core_idl_files = get_path_info([
                                  "painting/PictureRecorder.idl",
                                  "painting/RRect.idl",
                                  "painting/Shader.idl",
+                                 "painting/Typeface.idl",
                                  "view/EventCallback.idl",
                                  "view/FrameCallback.idl",
                                  "view/View.idl",

sky/engine/core/painting/Canvas.cpp

@@ -264,6 +264,14 @@ void Canvas::drawPaintingNode(PaintingNode* paintingNode, const Point& p)
     translate(-p.sk_point.x(), -p.sk_point.y());
 }
 
+void Canvas::drawText(const String& text, const Point& p, const Paint& paint)
+{
+    if (!m_canvas)
+        return;
+    ASSERT(text);
+    m_canvas->drawText(text.utf8().data(), text.length(), p.sk_point.x(), p.sk_point.y(), paint.sk_paint);
+}
+
 void Canvas::drawAtlas(CanvasImage* atlas,
     const Vector<RSTransform>& transforms, const Vector<Rect>& rects,
     const Vector<SkColor>& colors, SkXfermode::Mode mode,

sky/engine/core/painting/Canvas.h

@@ -91,6 +91,7 @@ public:
     void drawPicture(Picture* picture);
     void drawDrawable(Drawable* drawable);
     void drawPaintingNode(PaintingNode* paintingNode, const Point& p);
+    void drawText(const String& text, const Point& p, const Paint& paint);
 
     void drawAtlas(CanvasImage* atlas,
         const Vector<RSTransform>& transforms, const Vector<Rect>& rects,

sky/engine/core/painting/Canvas.idl

@@ -39,6 +39,7 @@
   void drawPicture(Picture picture);
   void drawDrawable(Drawable drawable);
   void drawPaintingNode(PaintingNode paintingNode, Point p);
+  void drawText(DOMString text, Point p, Paint paint);
 
   // TODO(eseidel): Paint should be optional, but optional doesn't work.
   [RaisesException] void drawAtlas(Image image,

sky/engine/core/painting/Paint.cpp

@@ -12,6 +12,7 @@
 #include "sky/engine/core/painting/PaintingStyle.h"
 #include "sky/engine/core/painting/Shader.h"
 #include "sky/engine/core/painting/TransferMode.h"
+#include "sky/engine/core/painting/Typeface.h"
 #include "sky/engine/core/script/dom_dart_state.h"
 #include "sky/engine/wtf/text/StringBuilder.h"
 #include "third_party/skia/include/core/SkColorFilter.h"
@@ -35,6 +36,7 @@ enum PaintFields {
   kShader,
   kStyle,
   kTransferMode,
+  kTypeface,
 
   // kNumberOfPaintFields must be last.
   kNumberOfPaintFields,
@@ -82,6 +84,8 @@ Paint DartConverter<Paint>::FromDart(Dart_Handle dart_paint) {
     paint.setStyle(DartConverter<PaintingStyle>::FromDart(values[kStyle]));
   if (!Dart_IsNull(values[kTransferMode]))
     paint.setXfermodeMode(DartConverter<TransferMode>::FromDart(values[kTransferMode]));
+  if (!Dart_IsNull(values[kTypeface]))
+    paint.setTypeface(DartConverter<Typeface*>::FromDart(values[kTypeface])->typeface());
 
   result.is_null = false;
   return result;

sky/engine/core/painting/Paint.dart

@@ -43,6 +43,7 @@ class Paint {
   Shader _shader;
   PaintingStyle _style;
   TransferMode _transferMode;
+  Typeface typeface;
 
   // Must match PaintFields enum in Paint.cpp.
   List<dynamic> get _value {
@@ -57,6 +58,7 @@ class Paint {
       _shader,
       _style,
       _transferMode,
+      typeface
     ];
   }
 
@@ -71,6 +73,8 @@ class Paint {
     // TODO(mpcomplete): Figure out how to show a drawLooper.
     if (_drawLooper != null)
       result += ', drawLooper:true';
+    if (typeface != null)
+      result += ', typeface: $_typeface';
     result += ')';
     return result;
   }

sky/engine/core/painting/Typeface.cpp

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "sky/engine/core/painting/Typeface.h"
+
+namespace blink {
+
+Typeface::Typeface(PassRefPtr<SkTypeface> typeface)
+    : typeface_(typeface) {
+}
+
+Typeface::~Typeface()
+{
+}
+
+} // namespace blink

sky/engine/core/painting/Typeface.h

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef SKY_ENGINE_CORE_PAINTING_TYPEFACE_H_
+#define SKY_ENGINE_CORE_PAINTING_TYPEFACE_H_
+
+#include "sky/engine/tonic/dart_wrappable.h"
+#include "sky/engine/wtf/PassRefPtr.h"
+#include "sky/engine/wtf/RefCounted.h"
+#include "third_party/skia/include/core/SkTypeface.h"
+
+namespace blink {
+
+class Typeface : public RefCounted<Typeface>, public DartWrappable {
+  DEFINE_WRAPPERTYPEINFO();
+ public:
+  ~Typeface() override;
+
+  SkTypeface* typeface() { return typeface_.get(); }
+  void set_typeface(PassRefPtr<SkTypeface> typeface) { typeface_ = typeface; }
+
+ protected:
+  Typeface(PassRefPtr<SkTypeface> typeface);
+
+ private:
+  RefPtr<SkTypeface> typeface_;
+};
+
+} // namespace blink
+
+#endif  // SKY_ENGINE_CORE_PAINTING_TYPEFACE_H_

sky/engine/core/painting/Typeface.idl

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+interface Typeface {
+};