Angle Tool
How to set up the Angle tool:
// Init cornerstone tools
cornerstoneTools.init();
// Enable any elements, and display images
// ...
// Add our tool, and set it's mode
const AngleTool = cornerstoneTools.AngleTool;
cornerstoneTools.addTool(AngleTool)
cornerstoneTools.setToolActive('Angle', { mouseButtonMask: 1 })