mirror of
https://git.minetest.land/Mineclonia/Mineclonia.git
synced 2024-11-05 01:05:05 +00:00
82 lines
2.7 KiB
Markdown
82 lines
2.7 KiB
Markdown
# Player Physics API.
|
|
|
|
Version: 1.0.0
|
|
|
|
This mod simplifies the setting of player physics (speed, jumping height, gravity).
|
|
|
|
The problem with `set_physics_override` is that is sets a raw value.
|
|
As soon as two independent mods want to mess with player physics, this is a problem.
|
|
|
|
This has a different approach in that you add and remove an arbitrary number of factors for each attribute.
|
|
The actual player attribute will be the product of all factors which have been added.
|
|
|
|
## Preconditions
|
|
There is only one precondition to using this mod, but it is important:
|
|
Mods *MUST NOT* call `set_physics_override` directly! Instead, to modify player physics, use this API.
|
|
|
|
## Functions
|
|
### `playerphysics.add_physics_factor(player, physic, id, value)`
|
|
Adds a factor for a player physic and updates the player physics immeiately.
|
|
|
|
#### Parameters
|
|
* `player`: Player object
|
|
* `physic`: Type of player physic to change. Any of the numeric values of `set_physics_override` (e.g. `"speed"`, `"jump"`, `"gravity"`)
|
|
* `id`: Unique identifier for this factor. Identifiers are stored on a per-player per-physics type basis
|
|
* `value`: The factor to add to the list of products
|
|
|
|
### `playerphysics.remove_physics_factor(player, physic, id)`
|
|
Removes the physics factor of the given ID and updates the player's physics.
|
|
|
|
#### Parameters
|
|
* `player`: Player object
|
|
* `physic`: Type of player physic to change. Any of the numeric values of `set_physics_override` (e.g. `"speed"`, `"jump"`, `"gravity"`)
|
|
* `id`: Unique identifier for the factor to remove
|
|
|
|
## Examples
|
|
### Speed changes
|
|
Let's assume this mod is used by multiple different mods all trying to change the speed.
|
|
Here's what it could look like:
|
|
|
|
Potions mod:
|
|
```
|
|
playerphysics.add_physics_factor(player, "speed", "run_potion", 2)
|
|
```
|
|
|
|
Exhaustion mod:
|
|
```
|
|
playerphysics.add_physics_factor(player, "jump", "exhausted", 0.75)
|
|
```
|
|
|
|
Electrocution mod:
|
|
```
|
|
playerphysics.add_physics_factor(player, "jump", "shocked", 0.9)
|
|
```
|
|
|
|
When the 3 mods have done their change, the real player speed is simply the product of all factors, that is:
|
|
|
|
2 * 0.75 * 0.9 = 1.35
|
|
|
|
The final player speed is thus 135%.
|
|
|
|
### Speed changes, part 2
|
|
|
|
Let's take the example above.
|
|
Now if the Electrocution mod is done with shocking the player, it just needs to call:
|
|
|
|
```
|
|
playerphysics.remove_physics_factor(player, "jump", "shocked")
|
|
```
|
|
|
|
The effect is now gone, so the new player speed will be:
|
|
|
|
2 * 0.75 = 1.5
|
|
|
|
### Sleeping
|
|
To simulate sleeping by preventing all player movement, this can be done with this easy trick:
|
|
|
|
```
|
|
playerphysics.add_physics_factor(player, "speed", "sleeping", 0)
|
|
playerphysics.add_physics_factor(player, "jump", "sleeping", 0)
|
|
```
|
|
|
|
This works regardless of the other factors because mathematics tell us that the factor 0 forces the product to be 0.
|