draw_path

https://github.com/kyorohiro/hello_skyengine/tree/master/draw_path

// following code is checked in 2016/01/13
import 'package:flutter/widgets.dart';
import 'package:flutter/painting.dart';
import 'package:flutter/rendering.dart';
import 'dart:ui' as sky;
void main() {
runApp(new DrawPathWidget()); //new GameTest());
}
class DrawPathWidget extends OneChildRenderObjectWidget {
RenderObject createRenderObject() {
return new DrawPathObject();
}
}
class DrawPathObject extends RenderBox {
void paint(PaintingContext context, Offset offset) {
context.canvas.scale(2.5, 2.5);
context.canvas.translate(50.0, 50.0);
paintWithStroke(context, offset);
context.canvas.translate(50.0, 0.0);
paintWithLinearGradient(context, offset);
}
void paintWithStroke(PaintingContext context, Offset offset) {
Paint p = new Paint();
p.strokeWidth = 2.0;
p.style = sky.PaintingStyle.stroke;
Path path = new Path();
path.moveTo(0.0, 0.0);
path.lineTo(10.0, 50.0);
path.lineTo(50.0, 60.0);
path.lineTo(40.0, 10.0);
path.close();
p.color = new Color.fromARGB(0xaa, 0xaa, 0xff, 0xff);
context.canvas.drawPath(path, p);
}
void paintWithLinearGradient(PaintingContext context, Offset offset) {
Paint p = new Paint();
p.style = sky.PaintingStyle.strokeAndFill;
List<Color> colors = [
const Color.fromARGB(0xaa, 0xff, 0x00, 0x00),
const Color.fromARGB(0xaa, 0x00, 0x00, 0x00),
const Color.fromARGB(0xaa, 0xff, 0xff, 0xff),
];
List<double> stops = [0.0, 0.5, 1.0];
LinearGradient gg = new LinearGradient(
begin: new Point(0.0, 0.0),
end: new Point(50.0, 60.0),
colors: colors,
stops: stops);
p.shader = gg.createShader();
Path path = new Path();
path.moveTo(0.0, 0.0);
path.lineTo(10.0, 50.0);
path.lineTo(50.0, 60.0);
path.lineTo(40.0, 10.0);
path.close();
context.canvas.drawPath(path, p);
}
}