Class: SilkLayout::Render::Painter

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

Constant Summary collapse

NAMED_COLORS = 
{
  black: [0, 0, 0],
  blue: [0, 0, 255],
  green: [0, 128, 0],
  lightblue: [173, 216, 230],
  red: [255, 0, 0],
  white: [255, 255, 255]
}.freeze

Class Method Summary collapse

Class Method Details

.color_to_symbol(color) ⇒ Object 



176
177
178
179
180
181
182
183
 
# File 'lib/silk_layout/render/painter.rb', line 176

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 



40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
 
# File 'lib/silk_layout/render/painter.rb', line 40

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 



56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
 
# File 'lib/silk_layout/render/painter.rb', line 56

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 



202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
 
# File 'lib/silk_layout/render/painter.rb', line 202

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 



227
228
229
230
231
232
233
 
# File 'lib/silk_layout/render/painter.rb', line 227

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

.hex_color(color) ⇒ Object 



194
195
196
197
198
199
200
 
# File 'lib/silk_layout/render/painter.rb', line 194

def self.hex_color(color)
  hex = color.delete_prefix("#")
  hex = hex.chars.flat_map { |char| [char, char] }.join if hex.length == 3
  return nil unless hex.match?(/\A[0-9a-f]{6}\z/)

  hex.scan(/../).map { |component| component.to_i(16) }
end

.paint(canvas, box, page_height_pt) ⇒ Object 



6
7
8
 
# 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_text(canvas, box, page_height_pt) ⇒ Object 



23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
 
# File 'lib/silk_layout/render/painter.rb', line 23

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 



185
186
187
188
189
190
191
192
 
# File 'lib/silk_layout/render/painter.rb', line 185

def self.rgb_color(color)
  normalized = color.to_s.strip.downcase
  return nil if normalized.empty? || normalized == "transparent"

  return hex_color(normalized) if normalized.start_with?("#")

  NAMED_COLORS[normalized.to_sym]
end

.set_color(canvas, color) ⇒ Object 



163
164
165
166
167
168
169
170
171
172
173
174
 
# File 'lib/silk_layout/render/painter.rb', line 163

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