Function onMouseMove

src/core/createRenderCoordinator.ts:2474–2499

(payload: ChartGPUEventPayload)

  };

  const onMouseMove = (payload: ChartGPUEventPayload): void => {
    pointerState = {
      source: 'mouse',
      x: payload.x,
      y: payload.y,
      gridX: payload.gridX,
      gridY: payload.gridY,
      isInGrid: payload.isInGrid,
      hasPointer: true,
    };

    // If we're over the plot and we have recent interaction scales, update interaction-x in domain units.
    // (Best-effort; render() refreshes scales and overlays.)
    if (payload.isInGrid && lastInteractionScales) {
      const xDomain = lastInteractionScales.xScale.invert(payload.gridX);
      setInteractionXInternal(Number.isFinite(xDomain) ? xDomain : null, 'mouse');
    } else if (!payload.isInGrid) {
      // Clear interaction-x when leaving the plot area (keeps synced charts from “sticking”).
      setInteractionXInternal(null, 'mouse');
    }

    crosshairRenderer.setVisible(payload.isInGrid);
    emitCrosshairCallback(payload.isInGrid ? payload.x : null);
    emitHoverCallback(payload.isInGrid ? payload : null);
    requestRender();
  };

  const onMouseLeave = (_payload: ChartGPUEventPayload): void => {
    // Only clear interaction overlays for real pointer interaction.