cs_drawing_program

credit suisse coding test

requires

• Node.js > 6.5.0
• npm > 3.10.10

install

$ npm install

run

$ node main

run tests

$ npm test

test coverage

$ npm run coverage

notes

Application is structured into 3 layers - similar to MVC The model layer contains the Canvas and Renderer that uses the canvas to draw shapes on it. The View relies on system's stdin and stdout. The data between Model and View flows only through the middle layer - Controller. Controller uses asynchronous Commands to implement the logic for deciding how should application react to the input from user.

to add a new command

• Create a new class extending Command
• Make sure all the services the command needs are injected via constructor to the CommandFactory
• In the CommandFactory Add code that instantiates the command and injects all that is needed into the constructor.
• In you Command subclass implement _execute function where you perform the action that the command should carry out. Use resolve or reject to finish the command.
• Add a rule in Controller to dispatch the command according to previous command and it's result.