paint method

  1. @override
void paint(
  1. Canvas canvas,
  2. Size size
)
override

Called whenever the object needs to paint. The given Canvas has its coordinate space configured such that the origin is at the top left of the box. The area of the box is the size of the size argument.

Paint operations should remain inside the given area. Graphical operations outside the bounds may be silently ignored, clipped, or not clipped. It may sometimes be difficult to guarantee that a certain operation is inside the bounds (e.g., drawing a rectangle whose size is determined by user inputs). In that case, consider calling Canvas.clipRect at the beginning of paint so everything that follows will be guaranteed to only draw within the clipped area.

Implementations should be wary of correctly pairing any calls to Canvas.save/Canvas.saveLayer and Canvas.restore, otherwise all subsequent painting on this canvas may be affected, with potentially hilarious but confusing results.

To paint text on a Canvas, use a TextPainter.

To paint an image on a Canvas:

  1. Obtain an ImageStream, for example by calling ImageProvider.resolve on an AssetImage or NetworkImage object.

  2. Whenever the ImageStream's underlying ImageInfo object changes (see ImageStream.addListener), create a new instance of your custom paint delegate, giving it the new ImageInfo object.

  3. In your delegate's paint method, call the Canvas.drawImage, Canvas.drawImageRect, or Canvas.drawImageNine methods to paint the ImageInfo.image object, applying the ImageInfo.scale value to obtain the correct rendering size.

Implementation

@override
void paint(Canvas canvas, Size size) {
  final scaleX = size.width / 20.0;
  final scaleY = size.height / 20.0;
  final scale = math.min(scaleX, scaleY);

  final translationX = (size.width - 20.0 * scale) / 2 - 2.0 * scale;
  final translationY = (size.height - 20.0 * scale) / 2 - 2.0 * scale;

  final path = Path();
  final paint = Paint()..color = color;

  path.moveTo(
    21.0 * scale + translationX,
    11.0 * scale + translationY,
  );

  path.lineTo(
    19.41 * scale + translationX,
    11.0 * scale + translationY,
  );

  path.lineTo(
    20.71 * scale + translationX,
    9.71 * scale + translationY,
  );

  path.cubicTo(
    21.102122487256242 * scale + translationX,
    9.31787797088223 * scale + translationY,
    21.10212248725624 * scale + translationX,
    8.68212232123891 * scale + translationY,
    20.710000318328472 * scale + translationX,
    8.290000152311144 * scale + translationY,
  );

  path.cubicTo(
    20.317878149400705 * scale + translationX,
    7.8978779833833785 * scale + translationY,
    19.682122499757387 * scale + translationX,
    7.897877983383379 * scale + translationY,
    19.29000033082962 * scale + translationX,
    8.290000152311146 * scale + translationY,
  );

  path.lineTo(
    16.59 * scale + translationX,
    11.0 * scale + translationY,
  );

  path.lineTo(
    14.41 * scale + translationX,
    11.0 * scale + translationY,
  );

  path.lineTo(
    16.71 * scale + translationX,
    8.71 * scale + translationY,
  );

  path.cubicTo(
    17.10212242234043 * scale + translationX,
    8.31787795465328 * scale + translationY,
    17.10212242234043 * scale + translationX,
    7.682122305009961 * scale + translationY,
    16.710000253412662 * scale + translationX,
    7.2900001360821935 * scale + translationY,
  );

  path.cubicTo(
    16.317878084484896 * scale + translationX,
    6.897877967154426 * scale + translationY,
    15.682122434841578 * scale + translationX,
    6.897877967154426 * scale + translationY,
    15.290000265913811 * scale + translationX,
    7.290000136082193 * scale + translationY,
  );

  path.lineTo(
    13.0 * scale + translationX,
    9.59 * scale + translationY,
  );

  path.lineTo(
    13.0 * scale + translationX,
    7.41 * scale + translationY,
  );

  path.lineTo(
    15.71 * scale + translationX,
    4.71 * scale + translationY,
  );

  path.cubicTo(
    16.102122406111476 * scale + translationX,
    4.317877889737469 * scale + translationY,
    16.102122406111476 * scale + translationX,
    3.6821222400941505 * scale + translationY,
    15.710000237183714 * scale + translationX,
    3.290000071166384 * scale + translationY,
  );

  path.cubicTo(
    15.317878068255947 * scale + translationX,
    2.897877902238617 * scale + translationY,
    14.682122418612627 * scale + translationX,
    2.897877902238616 * scale + translationY,
    14.29000024968486 * scale + translationX,
    3.290000071166382 * scale + translationY,
  );

  path.lineTo(
    13.0 * scale + translationX,
    4.59 * scale + translationY,
  );

  path.lineTo(
    13.0 * scale + translationX,
    3.0 * scale + translationY,
  );

  path.cubicTo(
    13.0 * scale + translationX,
    2.4477152501692068 * scale + translationY,
    12.552284749830793 * scale + translationX,
    2.0 * scale + translationY,
    12.0 * scale + translationX,
    2.0 * scale + translationY,
  );

  path.cubicTo(
    11.447715250169207 * scale + translationX,
    2.0 * scale + translationY,
    11.0 * scale + translationX,
    2.4477152501692068 * scale + translationY,
    11.0 * scale + translationX,
    3.0 * scale + translationY,
  );

  path.lineTo(
    11.0 * scale + translationX,
    4.59 * scale + translationY,
  );

  path.lineTo(
    9.71 * scale + translationX,
    3.29 * scale + translationY,
  );

  path.cubicTo(
    9.317877970882233 * scale + translationX,
    2.8978779022386165 * scale + translationY,
    8.68212232123891 * scale + translationX,
    2.8978779022386165 * scale + translationY,
    8.290000152311144 * scale + translationX,
    3.2900000711663835 * scale + translationY,
  );

  path.cubicTo(
    7.8978779833833785 * scale + translationX,
    3.68212224009415 * scale + translationY,
    7.8978779833833785 * scale + translationX,
    4.317877889737469 * scale + translationY,
    8.290000152311144 * scale + translationX,
    4.710000058665236 * scale + translationY,
  );

  path.lineTo(
    11.0 * scale + translationX,
    7.41 * scale + translationY,
  );

  path.lineTo(
    11.0 * scale + translationX,
    9.59 * scale + translationY,
  );

  path.lineTo(
    8.71 * scale + translationX,
    7.29 * scale + translationY,
  );

  path.cubicTo(
    8.31787795465328 * scale + translationX,
    6.897877967154426 * scale + translationY,
    7.68212230500996 * scale + translationX,
    6.897877967154426 * scale + translationY,
    7.290000136082193 * scale + translationX,
    7.290000136082193 * scale + translationY,
  );

  path.cubicTo(
    6.897877967154426 * scale + translationX,
    7.68212230500996 * scale + translationY,
    6.897877967154426 * scale + translationX,
    8.31787795465328 * scale + translationY,
    7.290000136082193 * scale + translationX,
    8.710000123581047 * scale + translationY,
  );

  path.lineTo(
    9.59 * scale + translationX,
    11.0 * scale + translationY,
  );

  path.lineTo(
    7.41 * scale + translationX,
    11.0 * scale + translationY,
  );

  path.lineTo(
    4.71 * scale + translationX,
    8.29 * scale + translationY,
  );

  path.cubicTo(
    4.317877889737469 * scale + translationX,
    7.8978779833833785 * scale + translationY,
    3.68212224009415 * scale + translationX,
    7.8978779833833785 * scale + translationY,
    3.2900000711663835 * scale + translationX,
    8.290000152311144 * scale + translationY,
  );

  path.cubicTo(
    2.8978779022386165 * scale + translationX,
    8.68212232123891 * scale + translationY,
    2.897877902238616 * scale + translationX,
    9.317877970882233 * scale + translationY,
    3.290000071166383 * scale + translationX,
    9.710000139809999 * scale + translationY,
  );

  path.lineTo(
    4.59 * scale + translationX,
    11.0 * scale + translationY,
  );

  path.lineTo(
    3.0 * scale + translationX,
    11.0 * scale + translationY,
  );

  path.cubicTo(
    2.4477152501692068 * scale + translationX,
    11.0 * scale + translationY,
    2.0 * scale + translationX,
    11.447715250169207 * scale + translationY,
    2.0 * scale + translationX,
    12.0 * scale + translationY,
  );

  path.cubicTo(
    2.0 * scale + translationX,
    12.552284749830793 * scale + translationY,
    2.4477152501692068 * scale + translationX,
    13.0 * scale + translationY,
    3.0 * scale + translationX,
    13.0 * scale + translationY,
  );

  path.lineTo(
    4.59 * scale + translationX,
    13.0 * scale + translationY,
  );

  path.lineTo(
    3.29 * scale + translationX,
    14.29 * scale + translationY,
  );

  path.cubicTo(
    3.100687349176904 * scale + translationX,
    14.477766599905555 * scale + translationY,
    2.9942016756583305 * scale + translationX,
    14.73336246362944 * scale + translationY,
    2.99420167565833 * scale + translationX,
    14.999999999999998 * scale + translationY,
  );

  path.cubicTo(
    2.9942016756583296 * scale + translationX,
    15.266637536370558 * scale + translationY,
    3.100687349176903 * scale + translationX,
    15.522233400094443 * scale + translationY,
    3.289999999999999 * scale + translationX,
    15.709999999999999 * scale + translationY,
  );

  path.cubicTo(
    3.4777665999055563 * scale + translationX,
    15.899312650823095 * scale + translationY,
    3.7333624636294416 * scale + translationX,
    16.00579832434167 * scale + translationY,
    4.0 * scale + translationX,
    16.00579832434167 * scale + translationY,
  );

  path.cubicTo(
    4.266637536370558 * scale + translationX,
    16.00579832434167 * scale + translationY,
    4.522233400094444 * scale + translationX,
    15.899312650823095 * scale + translationY,
    4.71 * scale + translationX,
    15.709999999999999 * scale + translationY,
  );

  path.lineTo(
    7.41 * scale + translationX,
    13.0 * scale + translationY,
  );

  path.lineTo(
    9.59 * scale + translationX,
    13.0 * scale + translationY,
  );

  path.lineTo(
    7.29 * scale + translationX,
    15.29 * scale + translationY,
  );

  path.cubicTo(
    7.100687349176903 * scale + translationX,
    15.477766599905555 * scale + translationY,
    6.99420167565833 * scale + translationX,
    15.733362463629442 * scale + translationY,
    6.99420167565833 * scale + translationX,
    16.0 * scale + translationY,
  );

  path.cubicTo(
    6.99420167565833 * scale + translationX,
    16.26663753637056 * scale + translationY,
    7.100687349176903 * scale + translationX,
    16.522233400094446 * scale + translationY,
    7.29 * scale + translationX,
    16.71 * scale + translationY,
  );

  path.cubicTo(
    7.477766599905555 * scale + translationX,
    16.8993126508231 * scale + translationY,
    7.733362463629441 * scale + translationX,
    17.005798324341672 * scale + translationY,
    8.0 * scale + translationX,
    17.005798324341672 * scale + translationY,
  );

  path.cubicTo(
    8.26663753637056 * scale + translationX,
    17.005798324341672 * scale + translationY,
    8.522233400094445 * scale + translationX,
    16.8993126508231 * scale + translationY,
    8.71 * scale + translationX,
    16.71 * scale + translationY,
  );

  path.lineTo(
    11.0 * scale + translationX,
    14.41 * scale + translationY,
  );

  path.lineTo(
    11.0 * scale + translationX,
    16.59 * scale + translationY,
  );

  path.lineTo(
    8.29 * scale + translationX,
    19.29 * scale + translationY,
  );

  path.cubicTo(
    7.8978779833833785 * scale + translationX,
    19.68212249975739 * scale + translationY,
    7.8978779833833785 * scale + translationX,
    20.317878149400705 * scale + translationY,
    8.290000152311144 * scale + translationX,
    20.710000318328472 * scale + translationY,
  );

  path.cubicTo(
    8.68212232123891 * scale + translationX,
    21.10212248725624 * scale + translationY,
    9.317877970882229 * scale + translationX,
    21.102122487256242 * scale + translationY,
    9.710000139809997 * scale + translationX,
    20.710000318328476 * scale + translationY,
  );

  path.lineTo(
    11.0 * scale + translationX,
    19.41 * scale + translationY,
  );

  path.lineTo(
    11.0 * scale + translationX,
    21.0 * scale + translationY,
  );

  path.cubicTo(
    11.0 * scale + translationX,
    21.552284749830793 * scale + translationY,
    11.447715250169207 * scale + translationX,
    22.0 * scale + translationY,
    12.0 * scale + translationX,
    22.0 * scale + translationY,
  );

  path.cubicTo(
    12.552284749830793 * scale + translationX,
    22.0 * scale + translationY,
    13.0 * scale + translationX,
    21.552284749830793 * scale + translationY,
    13.0 * scale + translationX,
    21.0 * scale + translationY,
  );

  path.lineTo(
    13.0 * scale + translationX,
    19.41 * scale + translationY,
  );

  path.lineTo(
    14.29 * scale + translationX,
    20.71 * scale + translationY,
  );

  path.cubicTo(
    14.477766599905555 * scale + translationX,
    20.8993126508231 * scale + translationY,
    14.733362463629442 * scale + translationX,
    21.005798324341672 * scale + translationY,
    15.0 * scale + translationX,
    21.005798324341672 * scale + translationY,
  );

  path.cubicTo(
    15.266637536370558 * scale + translationX,
    21.005798324341672 * scale + translationY,
    15.522233400094445 * scale + translationX,
    20.8993126508231 * scale + translationY,
    15.71 * scale + translationX,
    20.71 * scale + translationY,
  );

  path.cubicTo(
    15.899312650823097 * scale + translationX,
    20.522233400094446 * scale + translationY,
    16.00579832434167 * scale + translationX,
    20.26663753637056 * scale + translationY,
    16.00579832434167 * scale + translationX,
    20.0 * scale + translationY,
  );

  path.cubicTo(
    16.00579832434167 * scale + translationX,
    19.73336246362944 * scale + translationY,
    15.899312650823097 * scale + translationX,
    19.477766599905557 * scale + translationY,
    15.709999999999999 * scale + translationX,
    19.29 * scale + translationY,
  );

  path.lineTo(
    13.0 * scale + translationX,
    16.59 * scale + translationY,
  );

  path.lineTo(
    13.0 * scale + translationX,
    14.41 * scale + translationY,
  );

  path.lineTo(
    15.29 * scale + translationX,
    16.71 * scale + translationY,
  );

  path.cubicTo(
    15.477766599905555 * scale + translationX,
    16.8993126508231 * scale + translationY,
    15.73336246362944 * scale + translationX,
    17.005798324341672 * scale + translationY,
    16.0 * scale + translationX,
    17.005798324341672 * scale + translationY,
  );

  path.cubicTo(
    16.26663753637056 * scale + translationX,
    17.005798324341672 * scale + translationY,
    16.522233400094446 * scale + translationX,
    16.8993126508231 * scale + translationY,
    16.71 * scale + translationX,
    16.71 * scale + translationY,
  );

  path.cubicTo(
    16.8993126508231 * scale + translationX,
    16.522233400094446 * scale + translationY,
    17.005798324341672 * scale + translationX,
    16.26663753637056 * scale + translationY,
    17.005798324341672 * scale + translationX,
    16.0 * scale + translationY,
  );

  path.cubicTo(
    17.005798324341672 * scale + translationX,
    15.733362463629442 * scale + translationY,
    16.8993126508231 * scale + translationX,
    15.477766599905555 * scale + translationY,
    16.71 * scale + translationX,
    15.29 * scale + translationY,
  );

  path.lineTo(
    14.41 * scale + translationX,
    13.0 * scale + translationY,
  );

  path.lineTo(
    16.59 * scale + translationX,
    13.0 * scale + translationY,
  );

  path.lineTo(
    19.29 * scale + translationX,
    15.71 * scale + translationY,
  );

  path.cubicTo(
    19.477766599905554 * scale + translationX,
    15.899312650823099 * scale + translationY,
    19.73336246362944 * scale + translationX,
    16.005798324341672 * scale + translationY,
    20.0 * scale + translationX,
    16.005798324341672 * scale + translationY,
  );

  path.cubicTo(
    20.26663753637056 * scale + translationX,
    16.005798324341672 * scale + translationY,
    20.522233400094446 * scale + translationX,
    15.899312650823099 * scale + translationY,
    20.71 * scale + translationX,
    15.71 * scale + translationY,
  );

  path.cubicTo(
    20.8993126508231 * scale + translationX,
    15.522233400094445 * scale + translationY,
    21.005798324341672 * scale + translationX,
    15.266637536370558 * scale + translationY,
    21.005798324341672 * scale + translationX,
    15.0 * scale + translationY,
  );

  path.cubicTo(
    21.005798324341672 * scale + translationX,
    14.733362463629442 * scale + translationY,
    20.8993126508231 * scale + translationX,
    14.477766599905555 * scale + translationY,
    20.71 * scale + translationX,
    14.29 * scale + translationY,
  );

  path.lineTo(
    19.41 * scale + translationX,
    13.0 * scale + translationY,
  );

  path.lineTo(
    21.0 * scale + translationX,
    13.0 * scale + translationY,
  );

  path.cubicTo(
    21.552284749830793 * scale + translationX,
    13.0 * scale + translationY,
    22.0 * scale + translationX,
    12.552284749830793 * scale + translationY,
    22.0 * scale + translationX,
    12.0 * scale + translationY,
  );

  path.cubicTo(
    22.0 * scale + translationX,
    11.447715250169207 * scale + translationY,
    21.552284749830793 * scale + translationX,
    11.0 * scale + translationY,
    21.0 * scale + translationX,
    11.0 * scale + translationY,
  );

  path.close();

  canvas.drawPath(path, paint);
}