renderTree method

@override void renderTree(Canvas canvas)

Renders the world as seen through this camera.

If the world is not mounted yet, only the viewport and viewfinder elements will be rendered.

Implementation

@override
void renderTree(Canvas canvas) {
  canvas.save();
  canvas.translate(
    viewport.position.x - viewport.anchor.x * viewport.size.x,
    viewport.position.y - viewport.anchor.y * viewport.size.y,
  );
  // Render the world through the viewport
  if ((world?.isMounted ?? false) &&
      currentCameras.length < maxCamerasDepth) {
    canvas.save();
    viewport.clip(canvas);
    viewport.transformCanvas(canvas);
    backdrop.renderTree(canvas);
    canvas.save();
    try {
      currentCameras.add(this);
      void renderWorld(Canvas canvas) {
        canvas.transform2D(viewfinder.transform);
        world!.renderFromCamera(canvas);

        // Render the viewfinder elements, which will be in front of
        // the world,
        // but with the same transforms applied to them.
        viewfinder.renderTree(canvas);
      }

      final postProcessors = children.query<PostProcessComponent>();
      if (postProcessors.isNotEmpty) {
        assert(
          postProcessors.length == 1,
          'Only one post process component is allowed per camera.',
        );
        final postProcessor = postProcessors.first.postProcess;
        postProcessor.render(
          canvas,
          viewport.virtualSize,
          renderWorld,
          (context) {
            renderContext.currentPostProcess = context;
          },
        );
      } else {
        renderWorld(canvas);
      }
    } finally {
      currentCameras.removeLast();
    }
    canvas.restore();
    // Render the viewport elements, which will be in front of the world.
    viewport.renderTree(canvas);
    canvas.restore();
  }
  canvas.restore();
}