reveal.js

# Graphics, *Continued*

---

CS 65 // 2021-02-18

## Administrivia
- About lab submissions...
    + 
 From each lab, I typically assign **one** or two problems that must be turned in via codePost
    + 
 You do NOT need to submit the rest of your solutions
    + 
 However, they are there for practice, and I do recommend attempting them outside of class!

## Extra Credit Activities
- [Career Conference](https://calendar.drake.edu/event/be_unstoppable_flexible_fearless_career_conference?utm_source=newsletter&utm_medium=email&utm_content=DETAILS&utm_campaign=Faculty-Feb-9#.YCLmlHdKhTY)
    + Friday, 2/19 from 9:00am to 4:00pm
- 
 [Songs for A New World](https://calendar.drake.edu/event/songs_for_a_new_world?utm_campaign=widget&utm_medium=widget&utm_source=Drake+University+Calendar) Livestream Performance
    + Thursday, 2/25 from 8:00 to 10:00am
- 
 [Global Citizen Forum](https://www.drake.edu/diversity/initiatives/globalcitizenforum2021/)
    + Conference on equity and inclusion in higher ed
    + March 3-5

# Assignment 3: Debrief

# Exam 1

## Exam 1
- Exam 1 is released
- Be sure to carefully read the [exam procedures]( ../../resources/exam-procedures.html) before starting the exam
- 
 It is an **individual**, take-home exam
    + 
 No discussing with peers, mentors, or tutors
    + 
 You may only discuss the exam with me

## Tips for the Exam
- Program little by little, saving often, and getting one piece to work at a time
- 
 Ask for help!
    + Come talk to me if you're stuck for a while
- 
 Test your programs on a variety of inputs
- 
 Start early

# Object-Oriented Programming

## OO Programming
- An **object** consists of the following:
    + A collection of related **information**
    + A set of **methods** (i.e. operations) to manipulate that information
- 
 For example,
```py
p1 = Point(0,0)
p2 = Point(1,1)
rect = Rectangle(p1, p2)
rect.setFill("blue")
```
The `rect` object is keeping track of all the information about a rectangle

# Graphics Library

## Summary of Classes
- **GraphWin**
    + A "window" that acts like a canvas that can be shown to the user.
    + Has a width / height, background color, and ways to get input from the user

## Summary of Classes
- **GraphicsObject**
    + Any object that can be drawn to a GraphWin canvas has all the GraphicsObject methods
    + They have a position, fill color, outline color, etc.
    + The list of all GraphicsObject types are below:
    + Point, Line, Circle, Rectangle, Oval, Polygon, Text, Entry, and Image

## Getting Input from the User
- You can interact with the user through the WinGraph window in four ways:
    + 
 **getMouse()**: Waits for the user to click somewhere, and returns that point
    + 
 **getKey()**: Waits for the user to press a key on the keyboard and returns a string
    + 
 **checkMouse()**: Returns the last point the user clicked or None if they haven’t clicked recently
    + 
 **checkKey()**: Returns the last key pressed or None if they haven’t pressed a key since

## Changing Coordinates
- By default, when you construct a `GraphWin` the size is `200` by `200` pixels
```py
win = GraphWin()
```
- 
 You can change the size by constructing it with the constructor:
```py
win = GraphWin("Title", 640, 480)
```
`640` is the width and `480` is the height in **pixels**

## Changing Coordinates
```py
win = GraphWin("Title", 640, 480)
```
- The point `(0,0)` is the **upper-left corner** of `win`
- and `(639, 479)` is the **lower-right corner** of `win`
- 
 This can be changed to any coordinate system you want by using the **setCoords** method
```py
win.setCoords(0, 0, 2, 2)
```
- 
 This changes the coordinate system so `(0,0)` is the **lower-left** corner and `(2,2)` is the **upper-right**

# Lab Time