Class: Cosmos::TextureMappedSphere

Inherits:
GlShape show all
Defined in:
lib/cosmos/gui/opengl/texture_mapped_sphere.rb

Direct Known Subclasses

EarthModel, MoonModel

Instance Attribute Summary

Attributes inherited from GlShape

#base_color, #click_handler, #color, #doubleclick_handler, #dragable, #position, #rotation_x, #rotation_y, #rotation_z, #tipText

Instance Method Summary collapse

Methods inherited from GlShape

#drag, #draw, #handle_click, #handle_doubleclick, #hit, #identify

Constructor Details

#initialize(x, y, z, texture_filename) ⇒ TextureMappedSphere

Returns a new instance of TextureMappedSphere.



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# File 'lib/cosmos/gui/opengl/texture_mapped_sphere.rb', line 18

def initialize(x, y, z, texture_filename)
  super(x, y, z)

  @vdata = [ [1.0, 0.0, 0.0], [0.0, 1.0, 0.0], [-1.0, 0.0, 0.0], [0.0, -1.0, 0.0],
             [0.0, 0.0, 1.0], [0.0, 0.0, -1.0]]

  @tindices = [ [0,4,1], [1,4,2], [2,4,3], [3,4,0], [1,5,0],
                [2,5,1], [3,5,2], [0,5,3] ]

  @texture_filename = texture_filename
  @image = Qt::Image.new(texture_filename)
  @image_data = @image.bits.unpack("C*")
  index = 0
  length = @image_data.length
  while index < length
    temp = @image_data[index]
    @image_data[index] = @image_data[index + 2]
    @image_data[index + 2] = temp
    index += 4
  end
  @image_data = @image_data.pack("C*")
  @first = true
end

Instance Method Details

#draw_triangle(v1, v2, v3) ⇒ Object 



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# File 'lib/cosmos/gui/opengl/texture_mapped_sphere.rb', line 96

def draw_triangle(v1, v2, v3)
  GL.Enable(GL::TEXTURE_2D)
  GL.PolygonMode(GL::FRONT_AND_BACK, GL::FILL)
  GL::Begin(GL::TRIANGLES)
    tc1, tc2, tc3 = gen_tex_coords(v1, v2, v3)
    GL::TexCoord(tc1[0], tc1[1])
    GL::Vertex(v1)
    GL::TexCoord(tc2[0], tc2[1])
    GL::Vertex(v2)
    GL::TexCoord(tc3[0], tc3[1])
    GL::Vertex(v3)
  GL::End()
  GL.Disable(GL::TEXTURE_2D);

  #Show Triangles
  #GL.PolygonMode(GL::FRONT_AND_BACK, GL::LINE)
  #GL::Begin(GL::TRIANGLES)
  #  GL::Vertex(v1)
  #  GL::Vertex(v2)
  #  GL::Vertex(v3)
  #GL::End()
end

#drawshape(viewer) ⇒ Object 



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# File 'lib/cosmos/gui/opengl/texture_mapped_sphere.rb', line 144

def drawshape(viewer)
  GL.PushMatrix
  GL.ShadeModel(GL::FLAT);
  GL.Enable(GL::DEPTH_TEST);
  if @first == true
    GL.PixelStore(GL::UNPACK_ALIGNMENT, 1)
    texName = GL::GenTextures(1)
    GL::BindTexture(GL::TEXTURE_2D, texName[0])
    GL.TexParameter(GL::TEXTURE_2D, GL::TEXTURE_WRAP_S, GL::REPEAT);
    GL.TexParameter(GL::TEXTURE_2D, GL::TEXTURE_WRAP_T, GL::REPEAT);
    GL.TexParameter(GL::TEXTURE_2D, GL::TEXTURE_MAG_FILTER, GL::NEAREST);
    GL.TexParameter(GL::TEXTURE_2D, GL::TEXTURE_MIN_FILTER, GL::NEAREST);
    GL::TexImage2D(GL::TEXTURE_2D, 0, GL::RGBA, @image.width, @image.height, 0, GL::RGBA, GL::UNSIGNED_BYTE, @image_data)

    GL::TexEnv(GL::TEXTURE_ENV, GL::TEXTURE_ENV_MODE, GL::DECAL)

    @drawing_list = GL.GenLists(1)
    GL.NewList(@drawing_list, GL::COMPILE)
    GL.Enable(GL::TEXTURE_2D);
    GL.TexEnvf(GL::TEXTURE_ENV, GL::TEXTURE_ENV_MODE, GL::DECAL);
    GL::BindTexture(GL::TEXTURE_2D, texName[0])
    8.times do |index|
      subdivide_triangle(@vdata[@tindices[index][0]], @vdata[@tindices[index][1]], @vdata[@tindices[index][2]], 4)
    end
    GL.Disable(GL::TEXTURE_2D);
    GL.EndList

    @first = false
  end

  GL.CallList(@drawing_list)

  #Draw Axises
  #GL::Begin(GL::LINES)
  #  GL::Color3f(1.0, 0.0, 0.0)
  #  GL::Vertex([-2.0,  0.0,  0.0])
  #  GL::Vertex([ 2.0,  0.0,  0.0])
  #  GL::Vertex([ 0.0, -2.0,  0.0])
  #  GL::Vertex([ 0.0,  2.0,  0.0])
  #  GL::Vertex([ 0.0,  0.0, -2.0])
  #  GL::Vertex([ 0.0,  0.0,  2.0])
  #GL::End()

  GL.PopMatrix
end

#export ⇒ Object 



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# File 'lib/cosmos/gui/opengl/texture_mapped_sphere.rb', line 190

def export
  string =  "TEXTURE_MAPPED_SPHERE \"#{@texture_filename}\"\n"
  string << "  TIP_TEXT \"#{@tipText}\"\n" if @tipText
  string << "  POSITION #{self.position[0]} #{self.position[1]} #{self.position[2]}\n"
  string << "  ROTATION_X #{@rotation_x}\n" if @rotation_x
  string << "  ROTATION_Y #{@rotation_y}\n" if @rotation_y
  string << "  ROTATION_Z #{@rotation_z}\n" if @rotation_z
  return string
end

#gen_tex_coords(*v) ⇒ Object 



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# File 'lib/cosmos/gui/opengl/texture_mapped_sphere.rb', line 59

def gen_tex_coords(*v)
  lon_value = []
  lat_value = []

  3.times do |index|
    lon = Math.atan2(v[index][1], v[index][0]) + PI # 0 to 360
    lat = Math.acos(v[index][2]) # 0 to 180
    lon_value[index] = lon / (2 * PI)
    lat_value[index] = lat / PI
  end

  if ((lon_value[0] - lon_value[1]).abs > 0.5) or ((lon_value[1] - lon_value[2]).abs > 0.5) or ((lon_value[0] - lon_value[2]).abs > 0.5)
    if (lon_value[0] < 0.5)
      lon_value[0] += 1.0
    end
    if (lon_value[1] < 0.5)
      lon_value[1] += 1.0
    end
    if (lon_value[2] < 0.5)
      lon_value[2] += 1.0
    end
  end

  if lat_value[0] > 0.99 or lat_value[0] < 0.01
    lon_value[0] = (lon_value[1] + lon_value[2]) / 2.0
  end
  if lat_value[1] > 0.99 or lat_value[1] < 0.01
    lon_value[1] = (lon_value[0] + lon_value[2]) / 2.0
  end
  if lat_value[2] > 0.99 or lat_value[2] < 0.01
    lon_value[2] = (lon_value[1] + lon_value[0]) / 2.0
  end

  #GL::TexCoord(lon_value, lat_value)
  return [[lon_value[0], lat_value[0]], [lon_value[1], lat_value[1]], [lon_value[2], lat_value[2]]]
end

#normalize(v) ⇒ Object 



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# File 'lib/cosmos/gui/opengl/texture_mapped_sphere.rb', line 42

def normalize(v)
  normal = []

  d = sqrt((v[0] * v[0]) + (v[1] * v[1]) + (v[2] * v[2]))

  if (d == 0.0)
    puts "Error Zero Length Vector"
    normal = v
  else
    normal[0] = v[0] / d
    normal[1] = v[1] / d
    normal[2] = v[2] / d
  end

  return normal
end

#subdivide_triangle(v1, v2, v3, depth) ⇒ Object 



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# File 'lib/cosmos/gui/opengl/texture_mapped_sphere.rb', line 119

def subdivide_triangle(v1, v2, v3, depth)
  v12 = []
  v23 = []
  v31 = []

  if (depth == 0)
    draw_triangle(v1, v2, v3)
    return
  end

  3.times do |index|
    v12[index] = v1[index] + v2[index]
    v23[index] = v2[index] + v3[index]
    v31[index] = v3[index] + v1[index]
  end

  v12 = normalize(v12)
  v23 = normalize(v23)
  v31 = normalize(v31)
  subdivide_triangle(v1,  v12, v31, depth - 1)
  subdivide_triangle(v2,  v23, v12, depth - 1)
  subdivide_triangle(v3,  v31, v23, depth - 1)
  subdivide_triangle(v12, v23, v31, depth - 1)
end