flutter - Flutter：如何检查画布是否完全被Paint填充？

Question

我正在开发一个绘画游戏，其中玩家用颜料填充 svg，完成后，它会转到下一张图像。 播放屏幕

我在画布上使用 ClipPath 以允许仅对形状的内部区域进行绘画。形状按预期填充。

这是代码。

自定义油漆

class WorkerPainterCanvas extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Consumer<CanvasPathsState>(
        builder: (_, model, child) => Stack(fit: StackFit.expand, children: [
              Align(
                alignment: Alignment.center,
                child: ClipPath(               ///Path of Canvas
                  clipBehavior: Clip.antiAlias,
                  clipper: ImageClipper(),
                  child: RepaintBoundary(
                    child: CustomPaint(
                      isComplex: true,
                      painter: CanvasPainter(model.points),
                      child: Container(
                          child:
                              SvgPicture.asset(unfilledImages[imageCounter])), //svg image
                    ),
                  ),
                ),
              ),
              child,
            ]),
        child: ChangeNotifierProvider(
            create: (_) => CurrentPathState(), 
            child: const CurrentPathPaint() 
            ));
  }
}

class CanvasPainter extends CustomPainter {
  List<List<Offset>> points;

  CanvasPainter(this.points);

  @override
  void paint(Canvas canvas, Size size) {
    final paint = Paint()
      ..strokeWidth = 20.0
      ..color = Colors.white
      ..strokeCap = StrokeCap.round
      ..strokeJoin = StrokeJoin.round;
    for (final pointsSet in points) {
      canvas.drawPoints(PointMode.polygon, pointsSet, paint);
    }
  }

  @override
  bool shouldRepaint(covariant CustomPainter oldDelegate) => true;
}

带有 GestureDetector 的 CurrentPathPaint 用于用户输入

class CurrentPathPaint extends StatelessWidget {
  const CurrentPathPaint();

  @override
  Widget build(BuildContext context) {
    double _getHeight() {
      if (imageCounter == 0) {
        return MediaQuery.of(context).size.height / 2.8;
      } else if (imageCounter == 1) {
        return MediaQuery.of(context).size.height / 3.2;
      } else if (imageCounter == 2) {
        return MediaQuery.of(context).size.height / 2.8;
      } else if (imageCounter == 3) {
        return MediaQuery.of(context).size.height / 2.2;
      } else {
        return MediaQuery.of(context).size.height / 2.4;
      }
    }

    double _getWidth() {
      if (imageCounter == 0) {    //imageCounter refers to images index
        return MediaQuery.of(context).size.width / 1.5;
      } else if (imageCounter == 1) {
        return MediaQuery.of(context).size.width / 1.3;
      } else if (imageCounter == 2) {
        return MediaQuery.of(context).size.width / 1.3;
      } else if (imageCounter == 3) {
        return MediaQuery.of(context).size.width / 1.8;
      } else {
        return MediaQuery.of(context).size.width / 1.5;
      }
    }

    CurrentPathState currentPointsState =
        Provider.of<CurrentPathState>(context, listen: false);
    CanvasPathsState mainPointsState =
        Provider.of<CanvasPathsState>(context, listen: false);
    return Consumer<CurrentPathState>(
      builder: (_, model, child) => Stack(
        fit: StackFit.expand,
        children: [
          child,
        ],
      ),
      child: Align(
        alignment: Alignment.center,
        child: SizedBox(
           height: _getHeight(),   //bounding gesturedetector constraints to work only within image size
           width: _getWidth(),
          child: GestureDetector(
            behavior: HitTestBehavior.opaque,
            onPanStart: (details) {
              currentPointsState.addPoint(details.localPosition);

              currentPointsState.addPoint(details.localPosition);
            },
            onPanUpdate: (details) {
              currentPointsState.addPoint(details.localPosition);
            },
            onPanEnd: (details) {
              mainPointsState.addPath(currentPointsState.points);
              currentPointsState.resetPoints();
            },
          ),
        ),
      ),
    );
  }
}

路径剪辑代码

class ImageClipper extends CustomClipper<Path> {
  Path _getTimerPath() {    ///path of image
    Path path = parseSvgPathData(
        'M101.092 0H152.81V29.2542H143.646V47.2005C154.579 48.6509 165.3 51.5229 175.533 55.7616C185.037 59.6983 194.005 64.7663 202.25 70.8402L218.272 52.4293L245.747 78.7031L226.815 94.6663C233.938 103.742 239.805 113.764 244.238 124.467C250.618 139.869 253.902 156.378 253.902 173.049C253.902 198.157 246.457 222.702 232.507 243.579C218.557 264.456 198.73 280.728 175.533 290.336C152.336 299.945 126.81 302.459 102.184 297.561C77.558 292.662 54.9376 280.571 37.1832 262.817C19.4288 245.062 7.33785 222.442 2.43941 197.816C-2.45902 173.19 0.0549204 147.664 9.66354 124.467C14.1116 113.728 19.9876 103.712 27.0874 94.6665L8.15491 78.7031L35.6297 52.4293L51.6519 70.8403C53.2132 69.69 54.8032 68.5739 56.4208 67.4931C72.6375 56.6574 91.0673 49.7461 110.255 47.2005V29.2542H101.092V0ZM71.9567 255.349C88.232 266.236 107.37 272.054 126.951 272.065C139.959 272.073 152.841 269.518 164.861 264.545C176.881 259.573 187.804 252.28 197.004 243.085C206.205 233.89 213.504 222.972 218.484 210.955C223.464 198.937 226.027 186.057 226.027 173.049C226.027 153.468 220.221 134.326 209.344 118.045C198.466 101.763 183.005 89.0715 164.916 81.5754C146.826 74.0794 126.921 72.115 107.715 75.9308C88.5093 79.7465 70.8662 89.1711 57.0161 103.013C43.166 116.855 33.731 134.492 29.9037 153.695C26.0764 172.899 28.0288 192.806 35.514 210.9C42.9993 228.994 55.6813 244.462 71.9567 255.349ZM189.953 106.713C206.955 122.859 217.108 144.918 218.317 168.334C169.921 170.261 126.951 173.049 126.951 173.049V81.5648C150.399 81.564 172.951 90.5662 189.953 106.713Z');
    path.fillType = PathFillType.evenOdd;
    return path;
  }

  @override
  Path getClip(Size size) {
    Path path;
    if (imageCounter == 0) {
      path = _getTimerPath();  //the filling path shown in linked image
    } else if (imageCounter == 1) {
      path = _getCupPath();
    } else if (imageCounter == 2) {
      path = _getBallPath();
    } else if (imageCounter == 3) {
      path = _getWhistlePath();
    } else {
      path = _getFlagPath();
    }
    return path;
  }

  @override
  bool shouldReclip(covariant CustomClipper<Path> oldClipper) {
    return false;
  }
}

我的问题有没有办法检查整个画布（svg 的内部区域）是否已填充并根据该条件显示下一张图像？

标签： fluttercanvaspathpaintgesture