Class: Vizcore::Renderer::SnapshotRenderer

Inherits:
Object
  • Object
show all
Defined in:
lib/vizcore/renderer/snapshot_renderer.rb

Overview

Renders a deterministic software preview PNG from a scene frame.

Defined Under Namespace

Classes: Canvas

Constant Summary collapse

DEFAULT_WIDTH = 
1280
DEFAULT_HEIGHT = 
720
PATH_DEFAULT_MAX_SEGMENTS = 
4096
PATH_HARD_MAX_SEGMENTS = 
65_536
PATH_MAX_RECURSION = 
12
PALETTE = 
[
  [56, 189, 248],
  [225, 29, 72],
  [101, 255, 176],
  [244, 114, 182],
  [250, 204, 21]
].freeze

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(width: DEFAULT_WIDTH, height: DEFAULT_HEIGHT) ⇒ SnapshotRenderer

Returns a new instance of SnapshotRenderer.



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# File 'lib/vizcore/renderer/snapshot_renderer.rb', line 22

def initialize(width: DEFAULT_WIDTH, height: DEFAULT_HEIGHT)
  @width = normalize_dimension(width)
  @height = normalize_dimension(height)
end

Instance Attribute Details

#height ⇒ Object (readonly)

Returns the value of attribute height.



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# File 'lib/vizcore/renderer/snapshot_renderer.rb', line 27

def height
  @height
end

#width ⇒ Object (readonly)

Returns the value of attribute width.



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# File 'lib/vizcore/renderer/snapshot_renderer.rb', line 27

def width
  @width
end

Instance Method Details

#render(scene:, audio:) ⇒ String

Returns PNG bytes.

Parameters:

  • scene (Hash)
  • audio (Hash)

Returns:

  • (String) —

    PNG bytes



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# File 'lib/vizcore/renderer/snapshot_renderer.rb', line 32

def render(scene:, audio:)
  canvas = Canvas.new(width: width, height: height)
  canvas.fill_gradient(background_top(audio), background_bottom(audio))
  layers = Array(scene[:layers] || scene["layers"])
  layers = [default_layer] if layers.empty?
  layers.each_with_index { |layer, index| render_layer(canvas, layer, audio, index) }
  PngWriter.encode(width: width, height: height, rgba: canvas.bytes)
end