Class: SilkLayout::Render::Painter

Inherits:
Object
  • Object
show all
Defined in:
lib/silk_layout/render/painter.rb

Class Method Summary collapse

Class Method Details

.color_to_symbol(color) ⇒ Object 



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# File 'lib/silk_layout/render/painter.rb', line 192

def self.color_to_symbol(color)
  return nil unless color

  normalized = color.to_s.strip
  return nil if normalized.empty?

  normalized.to_sym
end

.draw_background(canvas, box, page_height_pt) ⇒ Object 



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# File 'lib/silk_layout/render/painter.rb', line 56

def self.draw_background(canvas, box, page_height_pt)
  return if box.is_a?(SilkLayout::Layout::AnonymousBlockBox)
  return unless box.respond_to?(:background_color) && box.background_color

  rgb = rgb_color(box.background_color)
  return unless rgb

  x = PdfRenderer.px_to_pt(box.border_box_x)
  y = page_height_pt - PdfRenderer.px_to_pt(box.border_box_y + box.border_box_height)
  w = PdfRenderer.px_to_pt(box.border_box_width)
  h = PdfRenderer.px_to_pt(box.border_box_height)

  canvas.fill_color(*rgb)
  canvas.rectangle(x, y, w, h).fill
end

.draw_borders(canvas, box, page_height_pt) ⇒ Object 



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# File 'lib/silk_layout/render/painter.rb', line 72

def self.draw_borders(canvas, box, page_height_pt)
  return if box.is_a?(SilkLayout::Layout::AnonymousBlockBox)
  return unless box.has_border

  x = PdfRenderer.px_to_pt(box.border_box_x)
  y = page_height_pt - PdfRenderer.px_to_pt(box.border_box_y + box.border_box_height)
  w = PdfRenderer.px_to_pt(box.border_box_width)
  h = PdfRenderer.px_to_pt(box.border_box_height)

  top = PdfRenderer.px_to_pt(box.border[:top])
  bottom = PdfRenderer.px_to_pt(box.border[:bottom])
  left = PdfRenderer.px_to_pt(box.border[:left])
  right = PdfRenderer.px_to_pt(box.border[:right])

  colors = [box.border_color[:top], box.border_color[:right], box.border_color[:bottom], box.border_color[:left]]
  if colors.uniq.length <= 1
    if top > 0
      canvas = set_color(canvas, box.border_color[:top])
      canvas.rectangle(x, y + h - top, w, top).fill
    end

    if bottom > 0
      canvas = set_color(canvas, box.border_color[:bottom])
      canvas.rectangle(x, y, w, bottom).fill
    end

    if left > 0
      canvas = set_color(canvas, box.border_color[:left])
      canvas.rectangle(x, y, left, h).fill
    end

    if right > 0
      canvas = set_color(canvas, box.border_color[:right])
      canvas.rectangle(x + w - right, y, right, h).fill
    end

    return
  end

  inner_w = [w - left - right, 0].max
  inner_h = [h - top - bottom, 0].max

  if top > 0 && inner_w > 0
    canvas = set_color(canvas, box.border_color[:top])
    canvas.rectangle(x + left, y + h - top, inner_w, top).fill
  end

  if bottom > 0 && inner_w > 0
    canvas = set_color(canvas, box.border_color[:bottom])
    canvas.rectangle(x + left, y, inner_w, bottom).fill
  end

  if left > 0 && inner_h > 0
    canvas = set_color(canvas, box.border_color[:left])
    canvas.rectangle(x, y + bottom, left, inner_h).fill
  end

  if right > 0 && inner_h > 0
    canvas = set_color(canvas, box.border_color[:right])
    canvas.rectangle(x + w - right, y + bottom, right, inner_h).fill
  end

  draw_corner(
    canvas,
    x,
    y + h - top,
    left,
    top,
    box.border_color[:left],
    box.border_color[:top],
    :top_left
  )

  draw_corner(
    canvas,
    x + w - right,
    y + h - top,
    right,
    top,
    box.border_color[:right],
    box.border_color[:top],
    :top_right
  )

  draw_corner(
    canvas,
    x,
    y,
    left,
    bottom,
    box.border_color[:left],
    box.border_color[:bottom],
    :bottom_left
  )

  draw_corner(
    canvas,
    x + w - right,
    y,
    right,
    bottom,
    box.border_color[:right],
    box.border_color[:bottom],
    :bottom_right
  )
end

.draw_corner(canvas, x, y, w, h, vertical_color, horizontal_color, kind) ⇒ Object 



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# File 'lib/silk_layout/render/painter.rb', line 205

def self.draw_corner(canvas, x, y, w, h, vertical_color, horizontal_color, kind)
  return if w <= 0 || h <= 0

  if vertical_color == horizontal_color
    canvas = set_color(canvas, vertical_color)
    canvas.rectangle(x, y, w, h).fill
    return
  end

  case kind
  when :top_left
    fill_triangle(canvas, horizontal_color, [x, y + h], [x + w, y + h], [x + w, y])
    fill_triangle(canvas, vertical_color, [x, y + h], [x + w, y], [x, y])
  when :top_right
    fill_triangle(canvas, horizontal_color, [x, y + h], [x + w, y + h], [x, y])
    fill_triangle(canvas, vertical_color, [x + w, y + h], [x + w, y], [x, y])
  when :bottom_left
    fill_triangle(canvas, horizontal_color, [x, y], [x + w, y], [x + w, y + h])
    fill_triangle(canvas, vertical_color, [x, y], [x + w, y + h], [x, y + h])
  when :bottom_right
    fill_triangle(canvas, horizontal_color, [x, y], [x + w, y], [x, y + h])
    fill_triangle(canvas, vertical_color, [x + w, y], [x + w, y + h], [x, y + h])
  end
end

.fill_triangle(canvas, color, p1, p2, p3) ⇒ Object 



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# File 'lib/silk_layout/render/painter.rb', line 230

def self.fill_triangle(canvas, color, p1, p2, p3)
  canvas = set_color(canvas, color)
  canvas.move_to(*p1)
  canvas.line_to(*p2)
  canvas.line_to(*p3)
  canvas.close_subpath.fill
end

.paint(canvas, box, page_height_pt) ⇒ Object 



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# File 'lib/silk_layout/render/painter.rb', line 6

def self.paint(canvas, box, page_height_pt)
  paint_box(canvas, box, page_height_pt)
end

.paint_image(canvas, box, page_height_pt) ⇒ Object 



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# File 'lib/silk_layout/render/painter.rb', line 41

def self.paint_image(canvas, box, page_height_pt)
  return unless box.image_path && File.file?(box.image_path)

  width = box.content_box_width
  height = box.content_box_height
  return unless width.positive? && height.positive?

  x_pt = PdfRenderer.px_to_pt(box.content_box_x)
  y_pt = page_height_pt - PdfRenderer.px_to_pt(box.content_box_y + height)
  width_pt = PdfRenderer.px_to_pt(width)
  height_pt = PdfRenderer.px_to_pt(height)

  canvas.image(box.image_path, at: [x_pt, y_pt], width: width_pt, height: height_pt)
end

.paint_text(canvas, box, page_height_pt) ⇒ Object 



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# File 'lib/silk_layout/render/painter.rb', line 24

def self.paint_text(canvas, box, page_height_pt)
  font_size_px = box.font_size || 16
  font_name = box.font_name || box.font_family || "Helvetica"

  font_size_pt = PdfRenderer.px_to_pt(font_size_px)
  ascent_pt = PdfRenderer.px_to_pt(box.respond_to?(:ascender) ? box.ascender : font_size_px * 0.8)

  canvas.font(font_name, size: font_size_pt)

  canvas = set_color(canvas, color_to_symbol(box.respond_to?(:color) ? box.color : nil) || :black)

  x_pt = PdfRenderer.px_to_pt(box.x)
  y_pt = page_height_pt - PdfRenderer.px_to_pt(box.y) - ascent_pt

  canvas.text(box.text, at: [x_pt, y_pt])
end

.rgb_color(color) ⇒ Object 



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# File 'lib/silk_layout/render/painter.rb', line 201

def self.rgb_color(color)
  SilkLayout::CSS::Color.rgb(color)
end

.set_color(canvas, color) ⇒ Object 



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# File 'lib/silk_layout/render/painter.rb', line 179

def self.set_color(canvas, color)
  return canvas unless color

  rgb = rgb_color(color)
  if rgb
    canvas.fill_color(*rgb)
  else
    canvas.fill_color(0, 0, 0)
  end

  canvas
end