ohif-viewer/platform/app/public/customizations/tools/smoothRotate.jsonc

// Example URL-loaded customization: smoothRotate
//
// Adds a "Smooth Rotate" tool button to the More Tools menu of the basic and
// longitudinal viewers. It activates the cornerstone `PlanarRotate` tool, which
// rotates the image freely as you drag (unlike the fixed 90° "Rotate Right").
//
// It extends the default toolbar customizations registered by the cornerstone
// extension (`cornerstone.toolbarButtons` / `cornerstone.toolbarSections`) using
// immutability-helper `$push` commands, so the built-in buttons are preserved.
//
// Load it with `?customization=tools/smoothRotate`.
{
  "global": {
    "cornerstone.toolbarButtons": {
      "$push": [
        {
          "id": "SmoothRotate",
          "uiType": "ohif.toolButton",
          "props": {
            "type": "tool",
            // Re-use the existing rotate icon.
            "icon": "tool-rotate-right",
            "label": "Smooth Rotate",
            "tooltip": "Smooth Rotate (drag to rotate the image freely)",
            "commands": {
              "commandName": "setToolActiveToolbar",
              "commandOptions": {
                "toolName": "PlanarRotate"
              }
            },
            "evaluate": "evaluate.cornerstoneTool"
          }
        }
      ]
    },
    "cornerstone.toolbarSections": {
      "MoreTools": {
        "$push": ["SmoothRotate"]
      }
    }
  }
}