Class: Magick::RVG::Utility::GraphicContext

Inherits:
Object
  • Object
show all
Defined in:
lib/rvg/misc.rb

Overview

class TextAttributes

Constant Summary collapse

FONT_STRETCH = 
{
  :normal => Magick::NormalStretch,
  :ultra_condensed => Magick::UltraCondensedStretch,
  :extra_condensed => Magick::ExtraCondensedStretch,
  :condensed       => Magick::CondensedStretch,
  :semi_condensed  => Magick::SemiCondensedStretch,
  :semi_expanded   => Magick::SemiExpandedStretch,
  :expanded        => Magick::ExpandedStretch,
  :extra_expanded  => Magick::ExtraExpandedStretch,
  :ultra_expanded  => Magick::UltraExpandedStretch
}
FONT_STYLE = 
{
  :normal  => Magick::NormalStyle,
  :italic  => Magick::ItalicStyle,
  :oblique => Magick::ObliqueStyle
}
FONT_WEIGHT = 
{
  'normal'  => Magick::NormalWeight,
  'bold'    => Magick::BoldWeight,
  'bolder'  => Magick::BolderWeight,
  'lighter' => Magick::LighterWeight
}
TEXT_ANCHOR = 
{
  :start  => Magick::StartAnchor,
  :middle => Magick::MiddleAnchor,
  :end    => Magick::EndAnchor
}
ANCHOR_TO_ALIGN = 
{
  :start  => Magick::LeftAlign,
  :middle => Magick::CenterAlign,
  :end    => Magick::RightAlign
}
TEXT_DECORATION = 
{
:none         => Magick::NoDecoration,
:underline    => Magick::UnderlineDecoration,
:overline     => Magick::OverlineDecoration,
:line_through => Magick::LineThroughDecoration}
TEXT_STRATEGIES = 
{
  'lr-tb' => LRTextStrategy, 'lr' => LRTextStrategy,
  'rt-tb' => RLTextStrategy, 'rl' => RLTextStrategy,
  'tb-rl' => TBTextStrategy, 'tb' => TBTextStrategy
}

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ GraphicContext

Returns a new instance of GraphicContext.



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# File 'lib/rvg/misc.rb', line 521

def initialize
  @gc = Magick::Draw.new
  @shadow = []
  @shadow << Magick::Draw.new
  @text_attrs = TextAttributes.new
  init_matrix
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(methID, *args, &block) ⇒ Object 



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# File 'lib/rvg/misc.rb', line 529

def method_missing(methID, *args, &block)
  @gc.__send__(methID, *args, &block)
end

Instance Attribute Details

#gc ⇒ Object (readonly)

Returns the value of attribute gc.



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# File 'lib/rvg/misc.rb', line 519

def gc
  @gc
end

#text_attrs ⇒ Object (readonly)

Returns the value of attribute text_attrs.



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# File 'lib/rvg/misc.rb', line 519

def text_attrs
  @text_attrs
end

Class Method Details

.degrees_to_radians(deg) ⇒ Object 



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# File 'lib/rvg/misc.rb', line 493

def self.degrees_to_radians(deg)
  Math::PI * (deg % 360.0) / 180.0
end

Instance Method Details

#affine(sx, rx, ry, sy, tx, ty) ⇒ Object 



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# File 'lib/rvg/misc.rb', line 533

def affine(sx, rx, ry, sy, tx, ty)
  sx, rx, ry, sy, tx, ty = Magick::RVG.convert_to_float(sx, rx, ry, sy, tx, ty)
  @gc.affine(sx, rx, ry, sy, tx, ty)
  @text_attrs.set_affine(sx, rx, ry, sy, tx, ty)
  nil
end

#baseline_shift(value) ⇒ Object 



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# File 'lib/rvg/misc.rb', line 540

def baseline_shift(value)
  @text_attrs.baseline_shift = case value
    when 'baseline', 'sub', 'super'
      value.intern
    when /[-+]?\d+%/, Numeric
      value
    else
      :baseline
    end
  nil
end

#font(name) ⇒ Object 



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# File 'lib/rvg/misc.rb', line 552

def font(name)
  @gc.font(name)
  @shadow[-1].font = name
  nil
end

#font_family(name) ⇒ Object 



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# File 'lib/rvg/misc.rb', line 558

def font_family(name)
  @gc.font_family(name)
  @shadow[-1].font_family = name
  nil
end

#font_size(points) ⇒ Object 



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# File 'lib/rvg/misc.rb', line 564

def font_size(points)
  @gc.font_size(points)
  @shadow[-1].pointsize = points
  nil
end

#font_stretch(stretch) ⇒ Object 



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# File 'lib/rvg/misc.rb', line 570

def font_stretch(stretch)
  stretch = FONT_STRETCH.fetch(stretch.intern, Magick::NormalStretch)
  @gc.font_stretch(stretch)
  @shadow[-1].font_stretch = stretch
  nil
end

#font_style(style) ⇒ Object 



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# File 'lib/rvg/misc.rb', line 577

def font_style(style)
  style = FONT_STYLE.fetch(style.intern, Magick::NormalStyle)
  @gc.font_style(style)
  @shadow[-1].font_style = style
  nil
end

#font_weight(weight) ⇒ Object 



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# File 'lib/rvg/misc.rb', line 584

def font_weight(weight)
  # If the arg is not in the hash use it directly. Handles numeric values.
  weight = FONT_WEIGHT.fetch(weight) {|key| key}
  @gc.font_weight(weight)
  @shadow[-1].font_weight = weight
  nil
end

#glyph_orientation_horizontal(deg) ⇒ Object 



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# File 'lib/rvg/misc.rb', line 592

def glyph_orientation_horizontal(deg)
  deg = Magick::RVG.convert_one_to_float(deg)
  @text_attrs.glyph_orientation_horizontal = (deg % 360) / 90 * 90
  nil
end

#glyph_orientation_vertical(deg) ⇒ Object 



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# File 'lib/rvg/misc.rb', line 598

def glyph_orientation_vertical(deg)
  deg = Magick::RVG.convert_one_to_float(deg)
  @text_attrs.glyph_orientation_vertical = (deg % 360) / 90 * 90
  nil
end

#inspect ⇒ Object 



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# File 'lib/rvg/misc.rb', line 604

def inspect
  @gc.inspect
end

#letter_spacing(value) ⇒ Object 



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# File 'lib/rvg/misc.rb', line 608

def letter_spacing(value)
  @text_attrs.letter_spacing = Magick::RVG.convert_one_to_float(value)
  nil
end

#pop ⇒ Object 



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# File 'lib/rvg/misc.rb', line 620

def pop
  @gc.pop
  @shadow.pop
  @text_attrs.pop
  nil
end

#push ⇒ Object 



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# File 'lib/rvg/misc.rb', line 613

def push
  @gc.push
  @shadow.push(@shadow.last.dup)
  @text_attrs.push
  nil
end

#rotate(degrees) ⇒ Object 



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# File 'lib/rvg/misc.rb', line 627

def rotate(degrees)
  degrees = Magick::RVG.convert_one_to_float(degrees)
  @gc.rotate(degrees)
  @sx =  Math.cos(GraphicContext.degrees_to_radians(degrees))
  @rx =  Math.sin(GraphicContext.degrees_to_radians(degrees))
  @ry = -Math.sin(GraphicContext.degrees_to_radians(degrees))
  @sy =  Math.cos(GraphicContext.degrees_to_radians(degrees))
  concat_matrix
  nil
end

#scale(sx, sy) ⇒ Object 



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# File 'lib/rvg/misc.rb', line 638

def scale(sx, sy)
  sx, sy = Magick::RVG.convert_to_float(sx, sy)
  @gc.scale(sx, sy)
  @sx = sx
  @sy = sy
  concat_matrix
  nil
end

#shadow ⇒ Object 



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# File 'lib/rvg/misc.rb', line 647

def shadow
  @shadow.last
end

#skewX(degrees) ⇒ Object 



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# File 'lib/rvg/misc.rb', line 651

def skewX(degrees)
  degrees = Magick::RVG.convert_one_to_float(degrees)
  @gc.skewX(degrees)
  @ry = Math.tan(GraphicContext.degrees_to_radians(degrees))
  concat_matrix
  nil
end

#skewY(degrees) ⇒ Object 



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# File 'lib/rvg/misc.rb', line 659

def skewY(degrees)
  degrees = Magick::RVG.convert_one_to_float(degrees)
  @gc.skewY(degrees)
  @rx = Math.tan(GraphicContext.degrees_to_radians(degrees))
  concat_matrix
  nil
end

#stroke_width(width) ⇒ Object 



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# File 'lib/rvg/misc.rb', line 667

def stroke_width(width)
  width = Magick::RVG.convert_one_to_float(width)
  @gc.stroke_width(width)
  @shadow[-1].stroke_width = width
  nil
end

#text(x, y, text) ⇒ Object 



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# File 'lib/rvg/misc.rb', line 674

def text(x, y, text)
  return if text.length == 0
  if @text_attrs.non_default?
    text_renderer = TEXT_STRATEGIES[@text_attrs.writing_mode].new(self)
  else
    text_renderer = DefaultTextStrategy.new(self)
  end

  text_renderer.render(x, y, text)
end

#text_anchor(anchor) ⇒ Object 



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# File 'lib/rvg/misc.rb', line 685

def text_anchor(anchor)
  anchor = anchor.intern
  anchor_enum = TEXT_ANCHOR.fetch(anchor, Magick::StartAnchor)
  @gc.text_anchor(anchor_enum)
  align = ANCHOR_TO_ALIGN.fetch(anchor, Magick::LeftAlign)
  @shadow[-1].align = align
  @text_attrs.text_anchor = anchor
  nil
end

#text_decoration(decoration) ⇒ Object 



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# File 'lib/rvg/misc.rb', line 695

def text_decoration(decoration)
  decoration = TEXT_DECORATION.fetch(decoration.intern, Magick::NoDecoration)
  @gc.decorate(decoration)
  @shadow[-1].decorate = decoration
  nil
end

#translate(tx, ty) ⇒ Object 



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# File 'lib/rvg/misc.rb', line 702

def translate(tx, ty)
  tx, ty = Magick::RVG.convert_to_float(tx, ty)
  @gc.translate(tx, ty)
  @tx = tx
  @ty = ty
  concat_matrix
  nil
end

#word_spacing(value) ⇒ Object 



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# File 'lib/rvg/misc.rb', line 711

def word_spacing(value)
  @text_attrs.word_spacing = Magick::RVG.convert_one_to_float(value)
  nil
end

#writing_mode(mode) ⇒ Object 



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# File 'lib/rvg/misc.rb', line 716

def writing_mode(mode)
  @text_attrs.writing_mode = mode
  nil
end