139 lines
4.8 KiB
Plaintext
139 lines
4.8 KiB
Plaintext
= Yugine Engine
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The yugine essentially is made of a sequence of levels. Levels can be
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nested, they can be streamed in, or loaded one at a time. Levels are
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made of levels.
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Different "modes" of using the engine has unique sequences of level
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loading orders. Each level has an associated script file. Level
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loading functions call the script file, as well as the level file. The
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level file can be considered to be a container of objects that the
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associated script file can access.
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.Game start
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* Engine scripts
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* config.js
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* game.lvl & game.js
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.Editor
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* Engine scripts
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* config.js
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* editor.js
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.Editor play
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* F5 debug.lvl
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** Used for custom debug level testing. If doesn't exist, game.lvl is loaded.
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* F6 game.lvl
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* F7 Currently edited level
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While playing ...
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* F7 Stop
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== Level model
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The game world is made up of objects. Levels are collections of
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objects. The topmost level is called "World". Objects are spawned into
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a specific level. If none are explicitly given, objects are spawned
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into World. Objects in turn are made up of components - sprites,
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colliders, and so on. Accessing an object might go like this:
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World.level1.enemy1.sprite.path = "brick.png";
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To set the image of enemy1 in level 1's sprite.
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.Level functions
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,===
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name, description
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levels, a list of all levels loaded in this one
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objects, a list of all objects belonging to this level (objects + levels)
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object_count, objects.length()
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spawn(type), creates an object from the supplied type in the level
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create(), creates an empty level inside of this one
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loadfile(file), loads file as a level inside of this one; returns it. Mainly for editor
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loadlevel(file), loads file as a level and does running required for gameplay
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load(level_json), clears this level and spawns all objects specified in the level_json
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clear(), kills all objects in this level
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kill(), cleans up the level and kills it
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,===
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.Objects
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Objects are things that exist in the game world.
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,===
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name, description
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level, the level this object belongs to
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pos, the global position
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relpos, the position relative to its level
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angle, the global angle
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relangle, angle relative to its level
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velocity, velocity of the object
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angularvelocity, angular velocity of the object
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alive, true if the object is valid
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varname, the variable name of the object (used for friendly naming)
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friction, physics attribnute
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elasticity, physics attribute
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flipx, true if the object is flipped on its x axis
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flipy, true if the object is mirrored on its y axis
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body, the internal gameobject id of the object
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controlled, true if the object is controlled by something
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phys, set to dynamic; kinematic; or static; explained below
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moi, the moment of inertia of the object
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mass, mass of the object
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visible, true if the object is visible. Set to false to disable all visible features belonging to it
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in_air(), true if the object is not on the ground
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on_ground(), !in_air()
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layer, collision layer for the physics engine
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draw_layer, draw order. higher numbers draw on top of lower ones
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scale, change to make the object larger or smaller
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from, the object this object was created from
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boundingbox, the boundingbox of this object in world dimensions
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push(vec), push this object each frame with vec velocity
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width, the boundingbox defined width
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height, the boundingbox defined height
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kill, destroy the object
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stop, ???
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world2this(pos), return the pos in world coordinates to relative this object
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this2world(pos), return the pos in this coordinates relative to the world
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make(props, level), instantiate an object based on this, with additional props, in level
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,===
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.Editor related object features
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,===
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gizmo, path to an image to draw in editor mode
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,===
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.Functions for object control
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,===
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clone(name; ext), create a copy of this object and extend it with ext; does not spawn
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instadup(), create an exact duplicate of this object in the World
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revert(), remove everything that makes the object unique; make it exactly like what it was spawned from
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,===
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.Physics
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All objects belong to the physics engine, but may be totally ignored by it.
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,===
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static, does not and will not move
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dynamic, moves under the auspices of the physics engine
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kinematic, moves under the auspices of the player or other control mechanism
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,===
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Physics properties work as such
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,===
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mass, affects how much a given force will move an object
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elasticity, affects momentum loss on collisions; multiplicative between two objects for each collision; 1 for no loss; 0 for total stoppage; >1 for a chaotic increasing entropy simulation
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friction, affects momentum loss when rubbing against another surface; multiplicative between the two objects
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,===
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.Textures & images
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A sprite is a display of a specific texture in the game world. The
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underlying texture has values associated with it, like how it should
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be rendered: is it a sprite, is it a texture, does it have mipmaps,
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etc. Textures are all file based, and are only accessed through the
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explicit path to their associated image file.
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