Transcript Microsoft® Small Basic Collision Detection Estimated time to complete this lesson: 1 hour.

Microsoft® Small Basic
Collision Detection
Estimated time to complete this lesson: 1 hour
Collision Detection
In this lesson, you will learn how to:
Use the concept of collision detection in
games.
What is Collision Detection?
In general, collision detection refers to determining the intersection of two
moving objects.
Now let’s talk about collision detection in games.
Collision detection in games requires the following
steps:
 Select two objects to test for collision.
 Determine whether those two objects collided.
How to Detect Collision?
Before we discuss how to detect collisions, you
should consider what happens to two objects when
they collide.
Two objects are said to collide if they come in contact
with each other. The objects may continue moving
after collision or one may come to rest, depending on
the nature of collision.
Collision detection is a basic aspect of twodimensional and three-dimesional games. Algorithms
help to detect the collision. Most games use
posteriori collision detection—that is, they detect the
collision after it has occurred.
Hit the Target – The Game
Now that you understand the concept of collision detection in games,
let’s make a game that uses the logic of collision detection.
The game involves two objects: the
turtle and the target. The player
must make the turtle hit the target
by specifying the correct angle and
the correct distance.
You use the logic of collision detection to detect the collision between the
turtle and the target. The game ends as soon as the two objects collide.
Hit the Target – How to Play
It’s time to play the game!
Steps to play the game:
 Set the angle to specify the
direction in which the turtle will
move.
 Specify the distance that the turtle
must cover to hit the target.
 Click the ‘Hit’ button to hit the
target.
 Click the ‘Reset’ button to reset the
position of the target.
Hit the Target – The Code
Now let’s understand the code for the game in detail…
 Create the user interface by using the
GraphicsWindow object.
 Next, use the Controls object to add a
button and a text box and to set the
size of the button.
 Use the Shapes object to add an image
of the shape, to move and animate the
shape, and to set its opacity level.
 Use the Turtle object, and set its angle
and moving distance by using the
Math object.
Let’s Summarize…
Congratulations! Now you know how to:
Use the concept of collision detection in games.
It’s Time to Apply Your Learning…
Using the concept of collision detection, create a game that involves two types
of objects: a bucket and apples. The apples fall randomly from the top of the
graphics window. The player tries to catch the apples in the bucket. The game
runs for 30 seconds. Include a score board to display the total number of
apples that the player caught in 30 seconds.
Your game should resemble the example in this slide.