class Z80Lib3D::Primitives::Vertex

Z80Lib3D::Primitives::Vertex ↑

A 3 element Vector and 2 screen coordinates:

Constants

S

A struct to represent Vertex instances

Public Class Methods

make(x, y, z, scrx0:128, scry0:128, scrz0:128, persp_dshift:7) click to toggle source

Creates a Vertex data argument for given coordinates.

# File lib/z80lib3d/primitives.rb, line 46
def Vertex.make(x, y, z, scrx0:128, scry0:128, scrz0:128, persp_dshift:7)
  x, y, z = x.round, y.round, z.round
  scrxmax = scrx0 * 2 - 1
  scrymax = scry0 * 2 - 1
  xp =  ((x << persp_dshift) / (z + scrz0)) + scrx0
  yp = -((y << persp_dshift) / (z + scrz0)) + scry0
  if xp < 0 || xp > scrxmax || yp < 0 || yp > scrymax
    raise ArgumentError, "Vertex.make: vertex screen coordinates out of bounds"
  end
  S.new(Vector::S.new(z, y, x), xp, yp)
end
make_many(*args, scrx0:128, scry0:128, scrz0:128, persp_dshift:7) click to toggle source

Creates many Vertex data arguments from triplets: [x, y, z].

# File lib/z80lib3d/primitives.rb, line 59
def Vertex.make_many(*args, scrx0:128, scry0:128, scrz0:128, persp_dshift:7)
  args.map{|x, y, z| Vertex.make(x, y, z, scrx0:scrx0, scry0:scry0, scrz0:scrz0, persp_dshift:persp_dshift)}
end
scale(sc, vertex, scrx0:128, scry0:128, scrz0:128, persp_dshift:7) click to toggle source

Creates a re-scaled Vertex data arguments.

# File lib/z80lib3d/primitives.rb, line 64
def Vertex.scale(sc, vertex, scrx0:128, scry0:128, scrz0:128, persp_dshift:7)
  if vertex.is_a?(Array)
    vertex.map{|v| Vertex.scale(sc, v, scrx0:scrx0, scry0:scry0, scrz0:scrz0, persp_dshift:persp_dshift)}
  else
    vec = vertex.vec
    Vertex.make(vec.x*sc, vec.y*sc, vec.z*sc, scrx0:scrx0, scry0:scry0, scrz0:scrz0, persp_dshift:persp_dshift)
  end
end