panToDirection method

void panToDirection(String direction)

Pans the plot area for given left, right, top, and bottom directions.

To perform this action, the plot area needs to be in zoomed state.

Implementation

void panToDirection(String direction) {
  final RenderBehaviorArea? parent = parentBox as RenderBehaviorArea?;
  if (parent == null) {
    return;
  }

  parent.hideInteractiveTooltip();
  final RenderCartesianAxes? cartesianAxes = parent.cartesianAxes;
  if (cartesianAxes == null) {
    return;
  }
  direction = direction.toLowerCase();
  cartesianAxes.visitChildren((RenderObject child) {
    if (child is RenderChartAxis) {
      final double currentZoomFactor = child.controller.zoomFactor;
      final double increaseZoomPosition =
          child.controller.zoomPosition + (child.isInversed ? -0.1 : 0.1);
      final double decreaseZoomPosition =
          child.controller.zoomPosition + (child.isInversed ? 0.1 : -0.1);
      if ((child.isVertical && direction == 'bottom') ||
          (!child.isVertical && direction == 'left')) {
        child.controller.zoomPosition =
            _minMax(decreaseZoomPosition, 0, 1 - currentZoomFactor);
      } else if ((child.isVertical && direction == 'top') ||
          (!child.isVertical && direction == 'right')) {
        child.controller.zoomPosition =
            _minMax(increaseZoomPosition, 0, 1 - currentZoomFactor);
      }
      if (parent.onZooming != null) {
        _bindZoomEvent(child, parent.onZooming!);
      }
    }
  });
  parent.invalidate();
}