cn-sensei-guides/01-white/03-01-wall-bounce.js

/**
Ninjas will use the GDP's moveX function to move a ball and then write the if statement that bounces the ball if
it touches the wall.

New Vocabulary and Concepts
* Boolean Logic
* GDP moveX() function
* If statements

Reinforced Vocabulary and Concepts
* Functions and Parameters
* Object Names

Sensei Notes
* This is the first introduction to Boolean logic.
* Make sure the Ninja understands that true is like yes or on, and that false is like no or off.

Solution Steps
1 Make sure the Ninja opens the correct scene.
2 To simplify this activity, some of the code is hidden from the Ninja. Make sure the focus is on the logic of
why and when code is executing and not how it is happening.
3 Make sure the Ninja is in the scene's Update Every Frame event. The name of the object is circle.
    moveX(circle);
4 Relate the moveX function to the spin function. Ask the Ninja to explain the similarities and differences
between the two.
5 The ball should not bounce, but the text should change from false to true.
6 Help the Ninja type the if statement, making sure that the brackets and parentheses are in the correct
places. This is a lot more code than in previous games but introducing Boolean logic will allow for more
interactive games. Explain that moveX is a GDP function and isTouchingWall is a function that this circle
knows.
    if(circle.isTouchingWall()) {

    }
7 Explain the different parts of an if statement. Walk through the example of looking outside and grabbing an
umbrella if it is raining . Ask the Ninja to come up with another real-world situation and write a code version
of it together.
8 Help the Ninja place the new line of code inside the if statement. Explain again that we are asking the circle
to perform its function named bounce.
    if(circle.isTouchingWall()) {
        circle.bounce();
        }
9 The circle should bounce every time it hits the wall.
10 Before the Ninja submits the scene, make sure they have a basic understanding of if statements and
Booleans.
*/
moveX(circle);

if(circle.isTouchingWall()) {
    circle.bounce();
}

/**
Sensei Stops
5 Tell a Sense/ why your circle doesn't bounce. What do is mean when circ/e.isTouchingWo/1 is fa lse? What
about when it is true?
The Ninja should recognize that we are just asking the ball to move. We have not asked it to bounce yet, but
it is reporting when it is touching the wall. Ask the Ninja to describe what the circle looks like when it says
false and compare it to when it says true.
10 Act out what is happening in the scene with a Sense/. You ore the circle, so soy out loud what you ore
thinking! You must always move. How often do you ask yourself if you are touching the wall? Once? Every
step? What happens if you touch the wall?
Help the Ninja act out this activity. You can use the real walls in the Dojo or come up with other bounds. The
Ninja should understand that the circle is constantly asking itself if it is touching a wall.
 */