As the game progresses we increase the spawn rate of the enemies
As the game progresses we increase the spawn rate of the enemies
Embedded Files
In the BaseLevel scene
In the BaseLevel scene
Add a new Node
Add a new Node
rename it to DifficultyManager
rename it to DifficultyManager
right-click on it and Save Branch As Scene
right-click on it and Save Branch As Scene
Open the new Difficulty Manager scene
Open the new Difficulty Manager scene
Add a Timer node as a child
Add a Timer node as a child
Set the One Shot Property to On
Set the One Shot Property to On
Attach a new script to the DifficultyManager
Attach a new script to the DifficultyManager
export a variable to represent the length of a game
export a variable to represent the length of a game
add a ready variable to provide access to the timer
add a ready variable to provide access to the timer
in the ready function
in the ready function
set the timer to run for game_length seconds
set the timer to run for game_length seconds
create a function to determine how far into
create a function to determine how far into
the round we are
the round we are
to get a progress value between 1.0 and 0.0
to get a progress value between 1.0 and 0.0
subtract the value of the time left on the timer
subtract the value of the time left on the timer
divided by the length of the game round
divided by the length of the game round
from 1
from 1
This function calculates how far along the game is, as a value between 0.0 (just started) and 1.0 (complete).
timer.time_left gives the number of seconds remaining on the timer.
Dividing that by game_length gives the proportion of the game remaining.
Subtracting from 1.0 inverts that, giving the proportion of the game completed.
For example:
If time_left is 15 and game_length is 30, this returns 1.0 - 0.5 = 0.5, meaning 50% complete.
Adding a curve to control spawning
Adding a curve to control spawning
Add an export variable called spawn_time_curve
Add an export variable called spawn_time_curve
set the type of the variable to Curve
set the type of the variable to Curve
In the Inspector
In the Inspector
add a new Curve resource
add a new Curve resource
Click on the curve resource
Click on the curve resource
to expand it
to expand it
set the min value to 0.25
set the min value to 0.25
set the max value to 2.0
set the max value to 2.0
click in the graph to add a point
click in the graph to add a point
drag it to the top left
drag it to the top left
click to add another point
click to add another point
drag it to the top right
drag it to the top right
We want to turn the curve into a line
We want to turn the curve into a line
Expand the Points property
Expand the Points property
Set Right Mode to Linear
Set Right Mode to Linear
Set Left Mode to Linear
Set Left Mode to Linear
In the script we can get a sample
In the script we can get a sample
from any point on the line
from any point on the line
Create a new function called get_spawn_time
Create a new function called get_spawn_time
This returns a float value
This returns a float value
game_progress_ratio() returns how far the game has progressed (0.0 at the start, 1.0 at the end).
game_progress_ratio() returns how far the game has progressed (0.0 at the start, 1.0 at the end).
spawn_time_curve.sample() looks at that point on the curve and returns the corresponding value (a spawn time in seconds).
spawn_time_curve.sample() looks at that point on the curve and returns the corresponding value (a spawn time in seconds).
So the result is: as the game progresses, the spawn time changes dynamically according to the shape of the curve.
So the result is: as the game progresses, the spawn time changes dynamically according to the shape of the curve.
Now open the enemy_path script
Now open the enemy_path script
add an export var for the difficulty manager
add an export var for the difficulty manager
now add the dificulty manager scene
now add the dificulty manager scene
in the Inspector
in the Inspector
Add a ready variable to get access to the
Add a ready variable to get access to the
Timer node of the EnemyPath
Timer node of the EnemyPath
Now set the timers wait time
Now set the timers wait time
to the spawn time calculted
to the spawn time calculted
by the curve in the difficulty manager
by the curve in the difficulty manager
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