Unit 2

Overview: In this second unit, you will design and build a drawing app that simulates finger painting. Users will dip their fingers into virtual paint pots of different colors and drag their fingers on the screen to paint on top of photos.

You will build three apps:

1. Paint Pot

2. Timer App

3. Webviewer App

Learning Objectives: In this unit, you will learn to:

• define and use variables to store changing values

• increment and decrement variables

• use the Canvas component for drawing

• handle touch and drag events on the device surface

• control screen layout with arrangement components

• use event handlers that have arguments (parameters)

Computer Science Concepts:

• variables

  • parameters

• user input

• event handlers

• getting and setting properties

App Inventor Concepts & Components:

• Canvas

• horizontal and vertical arrangements

• camera

• accelerometer sensor

• global variables

• operators