Class: Gosu::Image

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

Instance Method Summary collapse

Instance Method Details

#draw_3d(x, y, z, options = {}) ⇒ Object

x, y and z are relative to the center of the image



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# File 'lib/retro_render.rb', line 21

def draw_3d(x, y, z, options = {})
	width, height = self.width, self.height
	x, y, w, h = 0.0, 0.0, 1.0, 1.0

	if options.has_key?(:rect)
		# rect uses the convention [x, y, w, h], expressed in opengl (from 0.0 to 1.0, origin on bottom-left corner)
		x, y, w, h = options[:rect][0].to_f, options[:rect][1].to_f, options[:rect][2].to_f, options[:rect][3].to_f
		x = 0.0 if x < 0.0 or x > 1.0
		y = 0.0 if y < 0.0 or y > 1.0
		w = 0.0 if w < 0.0 or w > 1.0
		h = 0.0 if h < 0.0 or h > 1.0
		width, height = w * self.width, h * self.height
	end
	
	glBindTexture(GL_TEXTURE_2D, self.gl_tex_info.tex_name)
	glEnable(GL_ALPHA_TEST)
	glPushMatrix
	glTranslate(x, y, z)
	glScale(width, height, 1.0)		
	
	if options.has_key?(:rot)
		# rot uses the convention [x, y, z], expressed in degrees
		glRotate(options[:rot][0], 1, 0, 0)
		glRotate(options[:rot][1], 0, 1, 0)
		glRotate(options[:rot][2], 0, 0, 1)
	end

	glBegin(GL_QUADS)
		self.gl_tex_info.tex_coord_2d(x, y); glVertex3f(-0.5, -0.5, 0.0)
		self.gl_tex_info.tex_coord_2d(x + w, y); glVertex3f(0.5, -0.5, 0.0)
		self.gl_tex_info.tex_coord_2d(x + w, y + h); glVertex3f(0.5, 0.5, 0.0)
		self.gl_tex_info.tex_coord_2d(x, y + h); glVertex3f(-0.5, 0.5, 0.0)
	glEnd
	glPopMatrix
	glDisable(GL_ALPHA_TEST)
end