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# Hierarchy
![](../docs/images/hierarchy.png)
**the image will be changed**
### Vision
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* function `setProperty(name: Name, item: MetaItem?, notify: Boolean = true)`
Sets the `item` property to the element with the `name` identification. `notify` is a value which toggles the necessity of the change notification. Default is true.
### About properties
**Properties have to be set in particular order:**
* styles
* prototypes
* parent
* parent's styles
* defaults
## Inheritance
Inheritance is a very useful ability of `children` elements to get the same property in default as his parent does have (to 'inherit' it).

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## Inheritance
Inheritance is an ability of an element to transfer a pack of properties to its `children` elements 'wrapped inside'.
Properties have to be set in a specific order:
### Main properties' inheritance:
* styles
* parents
* parent's styles
* defaults
As for `prototypes`, this property has to be set after styles, but before parents. So the order will be this:
### Reference properties' inheritance:
* styles
* prototypes
* parents
* parent's styles
* defaults
------------------------
Let's take a closer look using a [Muon Monitor Visualization](demo/muon-monitor/README.md).
Running the demo, we will see this:
![](../docs/images/inheritance-1.png)
You can see a tree of elements on the left; 'World' is a `root`, 'bottom', 'middle', and 'top' are 'World's `children` and so on.
![](../docs/images/inheritance-tree.png)
On the right, there is a list with changeable properties.
![](../docs/images/inheritance-properties.png)
Properties, which can or cannot be inherited, are these:
* `visible` - toggles the visibility of an element. To be exact, the invisibility of an element is inheritable.
If a `parent` element is invisible, other elements are invisible as well, and they cannot be changed to visible mode.
![](../docs/images/inheritance-2-1-1.png)
![](../docs/images/inheritance-2-1-2.png)
* `material` - a group of properties, which can be inherited and which can be changed in `children` elements.
* `color` - color of an element.
* `opacity` - a number from 0 to 1 which represents percents of opacity (0 for 0%, 1 for 100%).
* `wireframe` - toggles the wireframe mode.
Let's see how elements of the `material` group inherit changing `color` property; ***other properties of this group inherit in the same way.***
Let's change color of 'World' element:
![](../docs/images/inheritance-2-2-1.png)
It is a `parent`, so 'bottom', 'middle', and 'top' elements inherit this color.
Now, let's change 'top's color:
![](../docs/images/inheritance-2-2-2.png)
It changes only, 'bottom' and 'middle' stays the same.
'top' is a `parent` element as well: it has `children` - 'SC72', 'SC73', ... ,'SC80'.
Let's change the color of 'SC76':
![](../docs/images/inheritance-2-2-3.png)
Again, only 'SC76' has changed among other 'siblings'.
However, 'SC76' is a `parent` too. Let's change one of its `children` color (here we change 'SC76_5's color'):
![](../docs/images/inheritance-2-2-4.png)
As we can see, `color` is inheritable property, which can be changed in a custom way.
If after all those changes we set at the 'World' element grey color, changes won't disappear:
![](../docs/images/inheritance-2-2-5.png)
* `rotation` - rotation of an element. Here, it is set by `x` value. It is inheritable and unable to be changed in `children` elements.
* `position` - position of an element, cannot be inherited.

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@startuml
'https://plantuml.com/class-diagram
interface Vision
interface Vision{
val parent: Vision?
fun getProperty(name): MetaItem?
fun setProperty(name, value)
interface Solid
Vision <- Solid
}
class VisionGroup
Vision <-- VisionGroup
class VisionBase{
basic vision
implementation
}
Vision <|-- VisionBase
class VisionBase
Vision <- VisionBase
interface VisionGroup{
A group of Visions
}
Vision <|-- VisionGroup
interface Solid{
The base for 3D geometry
}
Vision <|-- Solid
class SolidLabel
Solid <--- SolidLabel
SolidBase <-- SolidLabel
class SolidGroup
Solid <--- SolidGroup
VisionGroupBase <-- SolidGroup
Solid <|-- SolidGroup
VisionGroup <|-- SolidGroup
class SolidBase
Solid <--- SolidBase
VisionBase <-- SolidBase
class Composite
Solid <|-- Composite
VisionGroup <|-- Composite
class Box
Solid <|-- Box
class Tube
Solid <|-- Tube
class SphereLayer
SolidBase <-- SphereLayer
GeometrySolid <-- SphereLayer
class Sphere
Solid <|-- Sphere
SolidBase <-- Sphere
GeometrySolid <-- Sphere
class Box
SolidBase <-- Box
Hexagon <-- Box
class GenericHexagon
SolidBase <-- GenericHexagon
Hexagon <-- GenericHexagon
class Extruded
SolidBase <-- Extruded
GeometrySolid <-- Extruded
class PolyLine
Solid <--- PolyLine
SolidBase <-- PolyLine
interface GeometrySolid
Solid <--- GeometrySolid
interface Hexagon
GeometrySolid <-- Hexagon
class ConeSegment
GeometrySolid <-- ConeSegment
class ConeSurface
GeometrySolid <-- ConeSurface
class Convex
Solid <--- Convex
SolidBase <-- Convex
class Composite
Solid <--- Composite
SolidBase <-- Composite
interface SolidReference
VisionGroup <---- SolidReference
interface MutableVisionGroup
VisionGroup <---- MutableVisionGroup
class SolidReferenceGroup
VisionGroup <-- SolidReferenceGroup
Solid <-- SolidReferenceGroup
VisionBase <-- SolidReferenceGroup
SolidReference <-- SolidReferenceGroup
class ReferenceChild
VisionGroup <-- ReferenceChild
Solid <-- ReferenceChild
SolidReference <-- ReferenceChild
class VisionGroupBase
VisionBase <-- VisionGroupBase
MutableVisionGroup <-- VisionGroupBase
class RootVisionGroup
VisionGroupBase <-- RootVisionGroup
class VisionOfPlotly
VisionBase <-- VisionOfPlotly
@enduml