Game Development Lesson 3

Game Development Lesson 3

By Maria Cruz Farooqi

​Learning Target: I can identify instances of an object type before learning how to access the properties of an object. In doing so, I can make game levels that are more responsive to a player’s choices.

​We’re going to be able to describe the characteristics of the spawnables we spawn into our game.

Drag and Drop

Remember, all ​

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in our games have a set of ​

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that make them who they are. For example, all of the hero objects have a ​

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property. All objects of the same type will share the same set of properties.

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objects

properties

name

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An object type is the ​

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we give a group of objects that all share the ​

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. For example, we have a ​

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type. We also have a ​

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type and an enemy type. An instance of an object type is a specific version of that object type. For example, Tharin is an instance of a hero type. The unicorn pug is an instance of the pet type.

Multiple Choice

Take a look at the image. These are instances of what object type?

• pet

• gem

• hero

• enemy

Dropdown

There are a few properties that we need to review. Let’s take a look at maxSpeed, maxHealth, health, and attackDamage. If you want to grab the values stored in these properties, we need to use the ​

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More specifically, you will always write the name of the variable that stores the object in question. In the example seen on the slide, we create a variable named ​

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and assign it to the result of calling ​

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. This is now the object name that we need to write to the ​

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. Then, the name of the property goes on the ​

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. ”

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We need the assignment operator ​

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to ASSIGN our properties to new values. This is the same pattern that we saw when trying to reassign variables to new values. That makes sense because ​

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are just variables in disguise!

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First, we need to spawn the ​

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into the scene. We can do this with game.spawnPlayerXY(“champion”, x, y)



player = game.​

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( "​

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" , 36 , 30 )

player.​

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​

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450

Multiple Choice

What is the name of hero object in the scene?

• player

• hero

• Goliath

• munchkin

Dropdown

What statements do we need to write in order to access and assign the player’s properties?

In order to access and ​

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we need to use ​

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. For example, in order to increase Goliath’s max health, we should write the statement:



player​

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maxHealth = 500


We can follow this pattern when assigning the other properties to ​

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.

Drag and Drop

What does the error message mean to you?

The error says we need to set the ​

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to either the word “horizontal” or the word “​

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”.

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answer option

direction property

vertical

Match

Match the following:

• A variable that describes a particular characteristic of an object.

• A group of objects that all share the same properties.

• A specific example of an object type. For example, Anya is an instance of the hero type.

• The act of creating a new object in a scene while a game is running.

• The rules that govern how a player interacts with a game and how a game interacts with a player. 

Property

Object Type

Instance

Spawning

Game Mechanics

• Property

• Object Type

• Instance

• Spawning

• Game Mechanics