[@]demo:3d anime

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

// following code is checked in 2016/01/13
// failed to draw vertex now!!
import 'package:flutter/widgets.dart';
import 'package:flutter/rendering.dart';
import 'package:flutter/services.dart';
import 'dart:ui' as sky;
import 'dart:async';
import 'dart:typed_data';
import 'package:vector_math/vector_math_64.dart';
import 'package:flutter/scheduler.dart';
import 'package:flutter/services.dart';
import 'dart:math' as math;
sky.Image img = null;
main() async {
// "assets/icon.jpeg" is error 2015/12/13 's flutter, when draw image
img = await ImageLoader.load("assets/a.png");
runApp(new DrawVertexsWidget());
}
class DrawVertexsWidget extends OneChildRenderObjectWidget {
RenderObject createRenderObject() {
return new DrawVertexsObject()..anime();
}
}
class DrawVertexsObject extends RenderBox {
double angle = 0.0;
void anime() {
Scheduler.instance.addFrameCallback((Duration timeStamp) {
angle += math.PI / 90.0;
this.markNeedsPaint();
anime();
});
}
void paint(PaintingContext context, Offset offset) {
context.canvas.scale(4.0, 4.0);
context.canvas.translate(80.0, 80.0);
Matrix4 mat = new Matrix4.identity();
mat.rotateY(math.PI / 2.0 + angle);
mat.rotateX(angle);
drawSurface(context, offset, mat);
mat.rotateY(math.PI / 2.0);
drawSurface(context, offset, mat);
mat.rotateY(math.PI / 2.0);
drawSurface(context, offset, mat);
mat.rotateY(math.PI / 2.0);
drawSurface(context, offset, mat);
mat.rotateX(math.PI / 2.0);
drawSurface(context, offset, mat);
mat.rotateX(math.PI / 1.0);
drawSurface(context, offset, mat);
}
void drawSurface(PaintingContext context, Offset offset, Matrix4 mat) {
Paint paint = new Paint();
sky.VertexMode vertexMode = sky.VertexMode.triangleFan;
Vector3 vec1 = mat * new Vector3(-25.0, -25.0, -25.0);
Vector3 vec2 = mat * new Vector3(-25.0, 25.0, -25.0);
Vector3 vec3 = mat * new Vector3(25.0, 25.0, -25.0);
Vector3 vec4 = mat * new Vector3(25.0, -25.0, -25.0);
Vector3 normal = (vec1 - vec2).cross(vec1 - vec3);
if (normal.z < 0) {
return;
}
List<Point> vertices = [
new Point(vec1.x, vec1.y),
new Point(vec2.x, vec2.y),
new Point(vec3.x, vec3.y),
new Point(vec4.x, vec4.y)
];
List<Point> textureCoordinates = [
new Point(0.0, 0.0),
new Point(0.0, 1.0 * img.height),
new Point(1.0 * img.width, 1.0 * img.height),
new Point(1.0 * img.width, 0.0)
];
List<Color> colors = [
const Color.fromARGB(0xaa, 0xff, 0xff, 0xff),
const Color.fromARGB(0xaa, 0xff, 0xff, 0xff),
const Color.fromARGB(0xaa, 0xff, 0xff, 0xff),
const Color.fromARGB(0xaa, 0xff, 0xff, 0xff)
];
sky.TransferMode transferMode = sky.TransferMode.color;
sky.TileMode tmx = sky.TileMode.clamp;
sky.TileMode tmy = sky.TileMode.clamp;
Float64List matrix4 = new Matrix4.identity().storage;
sky.ImageShader imgShader = new sky.ImageShader(img, tmx, tmy, matrix4);
paint.shader = imgShader;
List<int> indicies = [0, 1, 2, 3];
context.canvas.drawVertices(vertexMode, vertices, textureCoordinates,
colors, transferMode, indicies, paint);
}
}
class ImageLoader {
static AssetBundle getAssetBundle() {
if (rootBundle != null) {
return rootBundle;
} else {
return new NetworkAssetBundle(new Uri.directory(Uri.base.origin));
}
}
static Future<sky.Image> load(String url) async {
AssetBundle bundle = getAssetBundle();
ImageResource resource = bundle.loadImage(url);
return resource.first;
}
}
# flutter.yaml
assets:
- assets/icon.jpeg
- assets/a.png