1. UBC 2016
Why Coding?

2. About Me Cam Joyce Johnston Heights joyce_c@surreyschools.ca
Teach Math and CS
Great wedge for introductions
ADST/Math Curriculum writer
Computing Science
Computer Programming

5. Muddy City

6. Computational Thinking
Solving this problem is great!
Practice solving problems like this helps develop computational thinking
Helps prepare students for more formalized CS education
It would be even better if:
We could solve ALL analogous problems
We could prove our method correct/optimal
We could solve the problem as efficiently as possible

7. Power Lines

8. 290 This is the cheapest solution:
While a house is not connected to the electricity
Select the cheapest connection that has not been used
If it does not connect two houses that are already connected to each other (redundant), use it
Mark this path as “used” so it will not be considered
This is the cheapest solution:
290

9. Can you find the equation?

10. Computational Thinking (CSTA)
Computational thinking (CT) is a problem-solving process that includes (but is not limited to)the following characteristics:
Formulating problems in a way that enables us to use a computer and other tools to help solve them.
Logically organizing and analyzing data
Representing data through abstractions such as models and simulations
Automating solutions through algorithmic thinking (a series of ordered steps)
Identifying, analyzing, and implementing possible solutions with the goal of achieving the most efficient and effective combination of steps and resources
Generalizing and transferring this problem solving process to a wide variety of problems
These skills are supported and enhanced by a number of dispositions or attitudes that are essential dimensions of CT. These dispositions or attitudes include:
Confidence in dealing with complexity
Persistence in working with difficult problems
Tolerance for ambiguity
The ability to deal with open ended problems
The ability to communicate and work with others to achieve a common goal or solution

11. Why Coding? Computational Thinking without programming is like
A chef without knives
A plumber without pipes
A pilot without a plane
Computational Thinking without programming is like knowing the solution without executing it.
Programming is a tool students should gain exposure to

12. Block Coding (Drag and Drop)
Snap
Scratch

13. I apologize in advance…

14. mrjoyce.wordpress.com Download the skeleton project
You may also want to download the slides in case you want to work ahead/need to catch up
Open in Greenfoot
There are two projects posted
The skeleton we’ll play with
A completed skeleton with the basic code complete

15. Task #0
I want the main character to start the game at the bottom of the screen
Currently I have to manually put the character in
Open the Space file
Find the Space() constructor
A constructor builds an object
Find this line of code
mainCharacter = new Ship();
Below it add this line of code
addObject( mainCharacter, getWidth()/2, getHeight() – 25);

16. Task #1 Locate the shoot() method of the Ship Build a new Laser
ShipLaser laser = new ShipLaser();
Make it point in the same direction as the Ship
Laser.setRotation( getRotation() );
Add it to the game
getWorld().addObject( laser, getX(), getY() );
Create a sound effect
GreenfootSound soundfx = new GreenfootSound("Laser.mp3");
Play the Sound effect
soundfx.play();
public void shoot() {
laser.setRotation( getRotation() );
getWorld().addObject(laser, getX(), getY()); }

18. Task #2 – Logic/Branching
Making the ship move
For now, let’s make the ship move left/right
Locate the processKeys() method in the Ship file
Here’s the code for left, can you figure out how to move right?
public void processKeys() {
if(Greenfoot.isKeyDown(“left”))
setLocation(getX() – 3, getY()); }
//add code for moving right here …

19. Task #3 – Variables/Data
private int speed; public Ship() { speed = 3; } public int getSpeed() return speed; public void setSpeed(int newSpeed) speed = newSpeed;

20. Task #3 – Variables/Data
Improving our movement code
public void processKeys() {
if(Greenfoot.isKeyDown(“left”))
setLocation(getX() – speed, getY()); } …

22. Task #4 - Repetition Locate the burst() method of the Ship
Add the following code (shown in yellow)
public void burst() {
int amount = 20;
double change = 180.0/(amount+1);
double angle = getRotation() change;
addFireBall(angle);
bursts = bursts - 1;
updateBurstBoard(-1); }

23. Task #4 - Repetition Make another update (shown in yellow)
public void burst() {
int amount = 20;
double change = 180.0/(amount+1);
double angle = getRotation() change;
for(int count = 0; count < amount; count++)
addFireBall(angle); }
bursts = bursts - 1;
updateBurstBoard(-1);

24. Task #4 - Repetition { int amount = 20;
Make another update (shown in yellow)
public void burst() {
int amount = 20;
double change = 180.0/(amount+1);
double angle = getRotation() change;
for(int count = 0; count < amount; count++)
addFireBall(angle);
angle = angle + change; }
bursts = bursts - 1;
updateBurstBoard(-1);

25. Greenfoot API

26. Coding Challenges Change how fast the Aliens shoot
Change how fast Projectiles move
Change the points awards when an Alien is removed from the game
Play the sound effect “Die.mp3” when an Alien is removed from the game
Play the sound effect “Hit.mp3” when the Ship collides with an AlienLaser
Change the amount of Fireballs launched in a burst
Change the spawnPU rate of Space
Change the amount of aliens in Space
Complete the launchHomingMissile method of the Ship
Edit code and predict its consequences, run the game to see if you’re right
Ex. What if you remove the lines: triggerReleased = false; from the Ship