paint method

@override void paint(Canvas canvas)

(Internal usage) Paints the graphics onto the given Canvas. If isMask is true, it clips the canvas to the path of each GraphicsDrawingData in the _drawingQueue, allowing for masking effects. Otherwise, it iterates over each GraphicsDrawingData in the _drawingQueue and draws its path or picture onto the canvas, filling it with the corresponding Paint. If the GraphicsDrawingData contains a gradient, it calculates the gradient's bounds and creates a shader from the gradient to fill the shape. If the GraphicsDrawingData contains vertices, it draws them onto the canvas using the corresponding Paint. If the GraphicsDrawingData contains a picture, it draws the picture onto the canvas.

Implementation

@override
void paint(Canvas canvas) {
  // TODO : add mask support.
  if (isMask) {
    for (var graph in _drawingQueue) {
      canvas.clipPath(graph!.path!, doAntiAlias: false);
    }
    return;
  }
  _constrainAlpha();
  if (!_isVisible) return;

  for (var graph in _drawingQueue) {
    if (graph!.hasPicture) {
      canvas.drawPicture(graph.picture!);
      break;
    }
    final fill = graph.fill!;
    final baseColor = fill.color;
    // FIX: causes flickering on rendering.
    // if (baseColor.alpha == 0) break;

    /// calculate gradient.
    if (graph.hasGradient) {
      Rect? graphBounds;
      if (graph.hasVertices) {
        graphBounds = graph.vertices!.getBounds();
      } else {
        graphBounds = graph.path!.getBounds();
      }

      /// TODO: try if this works to change the gradient
      /// opacity from the Shape.
      fill.color = baseColor.withOpacity(alpha);
      fill.shader = graph.gradient!.createShader(graphBounds!);
    } else {
      if (alpha != 1) {
        fill.color = baseColor.withOpacity(baseColor.opacity * alpha);
      }
    }
    if (graph.hasVertices) {
      if (graph.vertices!.uvtData != null && graph.shaderTexture != null) {
        graph.vertices!.calculateUvt(graph.shaderTexture);
      }
      if (fill.style == PaintingStyle.stroke) {
        canvas.drawRawPoints(
          ui.PointMode.lines,
          graph.vertices!.rawPoints!,
          fill,
        );
      } else {
        canvas.drawVertices(
          graph.vertices!.rawData!,
          graph.vertices!.blendMode!,
          fill,
        );
      }
    } else {
      canvas.drawPath(graph.path!, fill);
    }

    fill.color = baseColor;
  }
}