minhhoangtcu/graphingcalculator

Stanford University, CS193p, Winter 2015, Assignment 3 (iOS)

GraphingCalculator

Stanford University, CS193p, Winter 2015, Assignment 3 (iOS)

The Graphing Calculator is a continuation of the previous 2 assignments from the Stanford University CS193P course Developing iOS 8 Apps with Swift, available for free on iTunes. This is the third and final assignment in the Calculator series.

For the other 2 projects, please see:

https://github.com/sanjibahmad/CalculatorBrain

https://github.com/sanjibahmad/Calculator

This project provides graphing features in addition to the regular calculator functions. Graphs can be plotted by entering expressions where M is the independent variable. Please see examples below.

To plot M, enter: M, Graph

To plot sin(M), enter: M, Sin, Graph

To plot M x cos(M), enter: M, M, cos, x, Graph

Some interesting notes:

• The CalculatorBrain is reused to calculate the values of M for graphing
• Plot values are set in the GraphingViewController as the data source of GraphingView
• To fix the sluggish performance when zoomed out and panned, only the number of plots required for the screen width are calculated
• Graph scale and origin is stored in NSUserDefaults
• Upon device rotation, the graph is centered and adjusted slightly with the width and height change ratio