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Contents
#
# Copyright (c) 2001 by Jim Menard <jimm@io.com>
#
# Released under the same license as Ruby. See
# http://www.ruby-lang.org/en/LICENSE.txt.
#
# A lightweight view
class View
SHADOW_COLOR = [ 0.25, 0.25, 0.25 ]
attr_accessor :model, :color, :object, :shadow
def initialize(model, color = nil)
super()
@model = model
@color = color
@object = nil
@shadow = nil
end
def makeObject
raise "subclass should implement"
end
def makeShadow
# Don't raise error; some models may not have a shadow
end
def drawObject
CallList(@object)
end
def drawShadow
CallList(@shadow) if @shadow
end
def draw
# We don't always have enough information to make the 3D objects
# at initialize() time.
makeObject() unless @object
makeShadow() unless @shadow
rot = Graphics.rotations(model.vector)
PushMatrix()
# Translate and rotate shadow. Rotation around y axis only.
Translate(model.position.x, 0, model.position.z)
Rotate(rot.y, 0, 1, 0) if rot.y.nonzero?
# Draw shadow.
drawShadow() unless @shadow.nil?
# Translate and rotate object. Rotate object around x and z axes (y
# axis already done for shadow).
Translate(0, model.position.y, 0)
Rotate(rot.x, 1, 0, 0) if rot.x.nonzero?
Rotate(rot.z, 0, 0, 1) if rot.z.nonzero?
# Draw object.
drawObject()
PopMatrix()
end
# Given the height of an object, return a shadow color. The shadow color
# gets lighter as heigt increases.
def shadowColorForHeight(height)
wh = $PARAMS['world_height']
ratio = (height + wh / 2.0) / wh
shadowColor = []
SHADOW_COLOR.each_with_index { | c0, i |
min = c0
max = Canvas::GRASS_COLOR[i]
if min > max
tmp = min
min = max
max = tmp
end
shadowColor << min + ratio * (max - min)
}
return shadowColor
end
end
Version data entries
25 entries across 23 versions & 3 rubygems