visionforge/docs/inheritance.md

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

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Let's take a closer look using a Muon Monitor Visualization. Running the demo, we will see this:

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.

On the right, there is a list with changeable properties.

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.

• 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: It is a parent, so 'bottom', 'middle', and 'top' elements inherit this color.

  Now, let's change 'top's color: 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': 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'):

  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:

• 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.