Jovial Svg Graphx support

jovial_shape.dart

import 'package:flutter/material.dart';
import 'package:graphx/graphx.dart' hide MatrixUtils;
import 'package:graphx/graphx.dart' as graphx show MatrixUtils;
import 'package:jovial_svg/jovial_svg.dart';

/// A GraphX DisplayObject that renders a `ScalableImage` from
/// [jovial_svg](https://pub.dev/packages/jovial_svg)
///
/// Use this class to render a ScalableImage from
/// ```dart
/// final svgData = await ScalableImage.fromSvgHttpUrl(
///   Uri.parse('https://www.svgrepo.com/show/535115/alien.svg'),
/// );
/// final jovial = JovialShape(svgData);
/// jovial.colorize = Colors.red;
/// jovial.alpha = .3;
/// jovial.rotation = .4;
/// jovial.width = 100;
/// jovial.height = 100;
/// addChild(jovial);
/// ```
///
class JovialShape extends GDisplayObject {
  /// A [GMatrix] helper object used for transformations
  static final GMatrix _sHelperMatrix = GMatrix();

  /// The ScalableImage to render
  late ScalableImage scalableImage;

  /// Creates a new JovialShape with the given ScalableImage
  JovialShape(this.scalableImage);

  @override
  GRect? getBounds(GDisplayObject? targetSpace, [GRect? out]) {
    final matrix = _sHelperMatrix;
    matrix.identity();
    getTransformationMatrix(targetSpace, matrix);
    final viewport = scalableImage.viewport;
    final rect = GRect(
      viewport.left,
      viewport.top,
      viewport.width,
      viewport.height,
    );
    out = graphx.MatrixUtils.getTransformedBoundsRect(matrix, rect, out);
    return out;
  }

  @override
  void $applyPaint(Canvas? canvas) {
    var doSaveLayer = $alpha != 1;
    if (doSaveLayer) {
      final rect = getBounds(this)!.toNative();
      canvas!.saveLayer(
        rect,
        Paint()..color = Colors.black.withValues(alpha: $alpha),
      );
    }
    scalableImage.paint(canvas!);
    if (doSaveLayer) {
      canvas.restore();
    }
  }

  /// Updates the tint color and mode and redraws the shape
  void updateTint({required Color? tintColor, required BlendMode tintMode}) {
    scalableImage = scalableImage.modifyTint(
      newTintColor: tintColor,
      newTintMode: tintMode,
    );
    requiresRedraw();
  }

  /// Replaces the viewport of the scalable image
  void replaceViewport(
    Rect viewport, {
    bool prune = false,
    double pruningTolerance = 0,
  }) {
    scalableImage = scalableImage.withNewViewport(
      viewport,
      prune: prune,
      pruningTolerance: pruningTolerance,
    );
    requiresRedraw();
  }
}