Module: Glimmer::SWT::Custom::Shape::PathSegment

Included in:
Line, Path, Point
Defined in:
lib/glimmer/swt/custom/shape/path_segment.rb

Overview

Represents path segments like point, line, quad, and cubic curves Shapes could mix in

Instance Method Summary collapse

Instance Method Details

#add_to_geometry(geometry) ⇒ Object 



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# File 'lib/glimmer/swt/custom/shape/path_segment.rb', line 115

def add_to_geometry(geometry)
  the_path_segment_geometry_args = path_segment_geometry_args.dup
  if !is_a?(Point) && self.class != Path
    if !previous_point_connected?
      if the_path_segment_geometry_args.count == default_path_segment_arg_count
        point = the_path_segment_geometry_args.shift, the_path_segment_geometry_args.shift
        geometry.moveTo(point[0], point[1])
      elsif first_path_segment?
        point = the_path_segment_geometry_args[0..1]
        geometry.moveTo(point[0], point[1])
      end
    end
  end
  geometry.send(path_segment_geometry_method_name, *the_path_segment_geometry_args)
end

#add_to_swt_path(swt_path) ⇒ Object 



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# File 'lib/glimmer/swt/custom/shape/path_segment.rb', line 99

def add_to_swt_path(swt_path)
  the_path_segment_args = path_segment_args.dup
  if !is_a?(Point) && self.class != Path
    if !previous_point_connected?
      if the_path_segment_args.count == default_path_segment_arg_count
        point = the_path_segment_args.shift, the_path_segment_args.shift
        swt_path.moveTo(*point)
      elsif first_path_segment?
        point = the_path_segment_args[0..1]
        swt_path.moveTo(*point)
      end
    end
  end
  swt_path.send(path_segment_method_name, *the_path_segment_args)
end

#default_connected_path_segment_arg_count ⇒ Object

Subclasses must override to indicate expected count of args when previous point IS connected (e.g. 2 for line, 4 for quad, 6 for cubic)



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# File 'lib/glimmer/swt/custom/shape/path_segment.rb', line 63

def default_connected_path_segment_arg_count
end

#default_path_segment_arg_count ⇒ Object

Subclasses must override to indicate expected complete count of args when previous point is NOT connected (e.g. 4 for line, 6 for quad, 8 for cubic)



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# File 'lib/glimmer/swt/custom/shape/path_segment.rb', line 60

def default_path_segment_arg_count
end

#dispose(redraw: true) ⇒ Object 



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# File 'lib/glimmer/swt/custom/shape/path_segment.rb', line 78

def dispose(redraw: true)
  Glimmer::SWT::DisplayProxy.instance.auto_exec do
    # including classes could override to dispose of resources first
    # afterwards, parent removes from its path segments with post_dispose_content
    parent.post_dispose_content(self) if parent.is_a?(Path)
    if part_of_path?
      drawable.redraw if redraw && !drawable.is_a?(ImageProxy)
    else
      super(redraw: redraw)
    end
  end
end

#first_path_segment? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/glimmer/swt/custom/shape/path_segment.rb', line 91

def first_path_segment?
  parent.path_segments.first == self
end

#part_of_path? ⇒ Boolean

this is needed to indicate if a shape is part of a path or not (e.g. line and point could be either)

Returns:

  • (Boolean) 


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# File 'lib/glimmer/swt/custom/shape/path_segment.rb', line 48

def part_of_path?
  !!root_path
end

#path ⇒ Object 



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# File 'lib/glimmer/swt/custom/shape/path_segment.rb', line 39

def path
  current_parent = parent
  until current_parent.class == Path
    current_parent = current_parent.parent
    return current_parent if current_parent.nil?
  end
  current_parent
end

#path_segment_args ⇒ Object

Subclasses must override and implement to indicate args to pass when invoking SWT Path object method



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# File 'lib/glimmer/swt/custom/shape/path_segment.rb', line 56

def path_segment_args
  []
end

#path_segment_geometry_args ⇒ Object

Subclasses must override and implement to indicate args to pass when invoking SWT Path object method



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# File 'lib/glimmer/swt/custom/shape/path_segment.rb', line 70

def path_segment_geometry_args
  path_segment_args
end

#path_segment_geometry_method_name ⇒ Object

Subclasses may override to provide name of method to invoke for geometry object obtained from the Java AWT library java.awt.geom.Path2D.Double (e.g. curveTo vs cubicTo)



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# File 'lib/glimmer/swt/custom/shape/path_segment.rb', line 66

def path_segment_geometry_method_name
  path_segment_method_name
end

#path_segment_method_name ⇒ Object

Subclasses must override and implement to indicate method name to invoke on SWT Path object to add segment



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# File 'lib/glimmer/swt/custom/shape/path_segment.rb', line 52

def path_segment_method_name
  nil
end

#previous_path_segment ⇒ Object 



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# File 'lib/glimmer/swt/custom/shape/path_segment.rb', line 95

def previous_path_segment
  parent.path_segments[parent.path_segments.index(self) - 1] || self
end

#previous_point_connected? ⇒ Boolean

Subclasses must override to indicate otherwise

Returns:

  • (Boolean) 


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# File 'lib/glimmer/swt/custom/shape/path_segment.rb', line 74

def previous_point_connected?
  true
end

#root_path ⇒ Object 



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# File 'lib/glimmer/swt/custom/shape/path_segment.rb', line 31

def root_path
  current_parent = parent
  until current_parent.class == Path && !current_parent.parent.is_a?(Path)
    current_parent = current_parent.parent
    return current_parent if current_parent.nil?
  end
  current_parent
end