Scenefinal
ThorVG

A class to composite children paints. More...

Inheritance diagram for Scene:
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## Public Member Functions

Result | push (std::unique_ptr< Paint > paint) noexcept
| Passes drawing elements to the Scene using Paint objects. More...
Result | reserve (uint32_t size) noexcept
| Sets the size of the container, where all the paints pushed into the Scene are stored. More...
Result | clear () noexcept
| Sets the total number of the paints pushed into the scene to be zero. More...
Public Member Functions inherited from Paint
Result | rotate (float degree) noexcept
| Sets the angle by which the object is rotated. More...
Result | scale (float factor) noexcept
| Sets the scale value of the object. More...
Result | translate (float x, float y) noexcept
| Sets the values by which the object is moved in a two-dimensional space. More...
Result | transform (const Matrix &m) noexcept
| Sets the matrix of the affine transformation for the object. More...
Result | opacity (uint8_t o) noexcept
| Sets the opacity of the object. More...
Result | composite (std::unique_ptr< Paint > target, CompositeMethod method) const noexcept
| Sets the composition target object and the composition method. More...
Result | bounds (float *x, float *y, float *w, float *h) const noexcept
| Gets the bounding box of the paint object before any transformation. More...
Paint * | duplicate () const noexcept
| Duplicates the object. More...
uint8_t | opacity () const noexcept
| Gets the opacity value of the object. More...

## Static Public Member Functions

static std::unique_ptr< Scene > | gen () noexcept
| Creates a new Scene object. More...

## Detailed Description

A class to composite children paints.

As the traditional graphics rendering method, TVG also enables scene-graph mechanism. This feature supports an array function for managing the multiple paints as one group paint.

As a group, the scene can be transformed, made translucent and composited with other target paints, its children will be affected by the scene world.

## Member Function Documentation

## clear()

Result clear | ( |  | ) |

noexcept

Sets the total number of the paints pushed into the scene to be zero.

Warning
  Please do not use it, this API is not official one. It could be modified in the next version.

## gen()

static std::unique_ptr<Scene> gen | ( |  | ) |

staticnoexcept

Creates a new Scene object.

Returns
  A new Scene object.

## push()

Result push | ( | std::unique_ptr< Paint > | paint | ) |

noexcept

Passes drawing elements to the Scene using Paint objects.

Only pushed paints in the scene will be drawing targets. They are retained by the scene until you call Scene::clear(). If you know the number of the pushed objects in the advance, please call Scene::reserve().

Parameters

  [in] | paint | A Paint object to be drawn.

Returns
  Result::Success when succeed, Result::MemoryCorruption otherwise.

Note
  The rendering order of the paints is the same as the order as they were pushed. Consider sorting the paints before pushing them if you intend to use layering.

See also
  Scene::reserve()

## reserve()

Result reserve | ( | uint32_t | size | ) |

noexcept

Sets the size of the container, where all the paints pushed into the Scene are stored.

If the number of objects pushed into the scene is known in advance, calling the function prevents multiple memory reallocation, thus improving the performance.

Parameters

  [in] | size | The number of objects for which the memory is to be reserved.

Returns
  Result::Success when succeed.