Module: PandaCanvas::DrawingMethods

Included in:
AnimationCanvas, DrawingCanvas
Defined in:
lib/panda_canvas/drawing_methods.rb

Overview

DrawingMethods is a set of drawing methods used by PandaCanvas canvases.

Constant Summary collapse

CANVAS_UPDATE =

Signature set for defaults that are executed in each update event.

[[:font, 12]]
CANVAS_CALLS =

Names of calls that need to be sent directly to Canvas instead of the TexPlay image on draw.

[:font, :text, :text_rel].freeze

Instance Method Summary collapse

Instance Method Details

#font(height, font_name = Gosu::default_font_name) ⇒ Object

Sets the font with name font_name and height in pixels to be used when drawing text. All subsequent text drawing calls will use the given font.



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# File 'lib/panda_canvas/drawing_methods.rb', line 16

def font(height, font_name=Gosu::default_font_name)
  @used_fonts ||= {}
  key = [font_name, height]
  if @used_fonts.include? key
    @font = @used_fonts[key]
  else
    @font = @used_fonts[key] = Gosu::Font.new(self, font_name, height)
  end
end

#sym_color(sym) ⇒ Object

Returns a TexPlay predefined color for symbol sym.



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# File 'lib/panda_canvas/drawing_methods.rb', line 27

def sym_color(sym)
  rgb = TexPlay::Colors.const_get(sym.capitalize)[0..2].map! do |color|
    color * 255
  end
  Gosu::Color.new(255, *rgb)
end

#text(s, x, y, color = 0xffffffff) ⇒ Object

Draws text s in coordinates x and y with a given color.



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# File 'lib/panda_canvas/drawing_methods.rb', line 35

def text(s, x, y, color=0xffffffff)
  color = sym_color(color) if color.is_a? Symbol
  @font.draw(s, x, y, 0, 1, 1, color)
end

#text_rel(s, x, y, rel_x, rel_y, color = 0xffffffff) ⇒ Object

Draws text s in coordinates x and y with a given color. Text is aligned using rel_x and rel_y. If the value of rel_x is 0.0, the text will be to the right of x. If it is 1.0, the text will be to the left of x. If it is 0.5, it will be centered on x. The same applies to rel_y.



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# File 'lib/panda_canvas/drawing_methods.rb', line 46

def text_rel(s, x, y, rel_x, rel_y, color=0xffffffff)
  color = sym_color(color) if color.is_a? Symbol
  @font.draw_rel(s, x, y, 0, rel_x, rel_y, 1, 1, color)
end