This document provides instructions for creating a forest archery game in Scratch. It explains how to code the target to move to random screen positions using x and y coordinates. It also explains how to code the sight to move with the mouse and detect collisions with the target. When the target is hit, the score increases and a sound effect plays. Later tasks add misses decreasing the score and different point values for different target colors. Variables are used to track the score. The document provides the full algorithms and coding steps to create the game.
3. Forest Archery Game
In this lesson you will learn how to use random
numbers, variables and collision detection. You
will create an archery style target game.
Lesson
Become more familiar with translating an
algorithm into code
Understand the use of variables
Use if …else conditional statements
Objectives
4. Watch the video Forest Archery which is in the
programming in scratch folder in Groupwork to
learn how to create a target game.
Forest Archery Game
5. Task 12: Designing the Solution
Think about the two main things that you will need
to code:
1. moving the target
2. hitting the target
Code your program from the algorithms on the
next two slides. If you get struck, look back at the
video.
Forest Archery Game
6. Algorithm to move target (in Target sprite)
when flag is clicked
repeat forever
glide in 1 second to a random position*
* x is a random number from -240 to 240
y is a random number from -180 to 180
Forest Archery Game
7. Algorithm to move sight and fire (in Sight sprite)
when flag is clicked
repeat forever
go to mouse location (the mouse x and mouse y positions)
if the mouse button is down (the user has clicked the mouse)
if the sprite is touching the target sprite
add 1 to score variable
play Pop! sound
Say “Hit!” for 0.5 seconds
Forest Archery Game
8. Task 13: Hit and Miss
Change your program to so it takes 1 point off the
score every time a player misses!
If touching target
change score by 1
play Pop! sound
Say “Hit!” for 0.5 seconds
else
change score by -1
play Plunge! sound
say “Miss!” for 0.5 seconds
Forest Archery Game
You have already
programmed this
section
9. Task 14: Stay Positive!
Adapt the program so that the player will never
get a negative score. In order to achieve this you
will change your program so that points are only
taken away when the players score is above zero.
Forest Archery Game
10. Task 15: Bullseye!
Using if and touching colour blocks, change the
program so that when the target is hit, it adds the
following to the score:
•Gold - 5 points (and says “Bullseye!”)
•Red - 4 Points
•Blue - 3 Points
•Black - 2 Points
•White - 1 Point
Forest Archery Game
11. Variables
In this game, you used a variable block to keep
track of the score.
A variable is a space in a computer’s memory
where you can hold information used by your
program – just like storing things in a box.
Once a variable is created, the information stored
inside it can be set or changed (that is, varied –
hence the word “variable”).
Forest Archery Game
12. Plenary Question 1
Look at the adjacent script. The
programmer has made 3 errors.
Can you identify them?
1.
2.
3.
Forest Archery Game
13. Forest Archery Game
Keywords
Understand the use of an algorithm to develop
a solution to a problem
Translate an algorithm into code
Use conditional statements
Objectives
Collision
Variable
Random
Repeat
Forever
Touching
Value
Nesting
Editor's Notes
If score greater than 1 – should be set to 0 One of the mouse x – should be set to mouse y The second change score should be set to -1 that than +1
