Function handlePointerEvent

src/core/createRenderCoordinator.ts:4693–4885

(event)

  };

  const handlePointerEvent: RenderCoordinator['handlePointerEvent'] = (event) => {
    assertNotDisposed();
    if (domOverlaysEnabled) {
      // When DOM overlays are enabled, ignore handlePointerEvent (use native DOM events instead)
      return;
    }

    const canvas = gpuContext.canvas;
    if (!canvas) return;

    // Validate event coordinates (guard against NaN/Infinity from worker thread serialization issues)
    if (
      !Number.isFinite(event.x) ||
      !Number.isFinite(event.y) ||
      !Number.isFinite(event.gridX) ||
      !Number.isFinite(event.gridY) ||
      !Number.isFinite(event.plotWidthCss) ||
      !Number.isFinite(event.plotHeightCss)
    ) {
      return;
    }

    // Use pre-computed grid coordinates from event
    const { type, x, y, gridX, gridY, plotWidthCss, plotHeightCss, isInGrid } = event;

    if (type === 'leave') {
      pointerState = { ...pointerState, isInGrid: false, hasPointer: false };
      crosshairRenderer.setVisible(false);
      lastTooltipContent = null;
      lastTooltipX = null;
      lastTooltipY = null;
      
      hideTooltipInternal();
      emitCrosshairCallback(null);
      emitHoverCallback(null);
      
      setInteractionXInternal(null, 'mouse');
      requestRender();
      return;
    }

    if (type === 'move') {
      // Update pointer state for hover/crosshair
      pointerState = {
        source: 'mouse',
        x,
        y,
        gridX,
        gridY,
        isInGrid,
        hasPointer: true,
      };

      requestRender();
      return;
    }

    if (type === 'click') {