Method: Tea::Primitive#line

Defined in:
lib/tea/mix_primitive.rb

#line(x1, y1, x2, y2, color, options = nil) ⇒ Object

Draw a line from (x1, y1) to (x2, y2) with the given color (0xRRGGBBAA). Optional hash arguments:

:antialias

If true, smooth the line with antialiasing.

:mix

:blend averages the RGB parts of the line and destination colours by the line alpha (default). :replace writes over the RGBA parts of the line destination pixels.



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
 
# File 'lib/tea/mix_primitive.rb', line 121

def line(x1, y1, x2, y2, color, options=nil)
  r, g, b, a = Color.split(color)

  if options == nil
    antialias = false
    mix = (a < 0xff) ? :blend : :replace
  else
    if options[:mix] && [:blend, :replace].include?(options[:mix]) == false
      raise Tea::Error, "invalid mix option \"#{mix}\"", caller
    end

    antialias = options[:antialias] || false
    mix = (options[:mix] && a < 0xff) ? options[:mix] : :replace
    mix = (a < 0xff) ? (options[:mix] ? options[:mix] : :blend) : :replace
  end

  if primitive_buffer.class == SDL::Screen
    primitive_buffer.draw_line x1, y1, x2, y2, primitive_rgba_to_color(r, g, b, (mix == :replace ? a : 255)), antialias, (mix == :blend ? a : nil)
  else
    if antialias
      primitive_aa_line x1, y1, x2, y2, r, g, b, a, (mix == :blend ? BLEND_MIXER : REPLACE_MIXER)
    else
      primitive_line x1, y1, x2, y2, r, g, b, a, (mix == :blend ? BLEND_MIXER : REPLACE_MIXER)
    end
  end
end