#!/bin/env python

import sys
import math
from PyOSG import Producer
from PyOSG import osg
from PyOSG import osgGA
from PyOSG import osgUtil
from PyOSG import osgProducer
from PyOSG import osgDB
from PyOSG import osgText
from OpenGL.GL import *

def createLabel(pos, size, label):
    geode = osg.Geode()

    timesFont = "fonts/arial.ttf"

    if 1:
        text = osgText.Text()
        geode.addDrawable( text )

        text.setFont(timesFont)
        text.setPosition(pos)
        text.setCharacterSize(size)
        text.setAlignment(osgText.Text.CENTER_CENTER)
        text.setText(label)

    return geode


def createLabel3(pos, size, label):
    geode = osg.Geode()

    timesFont = "fonts/arial.ttf"

    if 1:
        text =  osgText.Text()
        geode.addDrawable( text )

        text.setFont(timesFont)
        text.setPosition(pos)
        text.setFontResolution(40,40)
        text.setCharacterSize(size)
        text.setAlignment(osgText.Text.CENTER_CENTER)
        text.setAutoRotateToScreen(true)
        text.setCharacterSizeMode(osgText.Text.OBJECT_COORDS_WITH_MAXIMUM_SCREEN_SIZE_CAPPED_BY_FONT_HEIGHT)
        text.setText(label)

    return geode

def createAxis(s, e, numReps, autoRotateMode, string):
    group = osg.Group()

    dv = e-s
    dv /= float(numReps-1)

    pos = s

    useAuto = True
    if useAuto:
        vertices = osg.Vec3Array()

        for i in range(numReps):
            at = osg.AutoTransform()
            at.setPosition(pos)
            at.setAutoRotateMode(autoRotateMode)
            at.addChild(createLabel(osg.Vec3(0.0,0.0,0.0),dv.length()*0.2,string))
            vertices.push_back(pos)
            pos += dv


            group.addChild(at)

        colors = osg.Vec4Array()
        colors.push_back(osg.Vec4(1.0,1.0,1.0,1.0))

        geom = osg.Geometry()
        geom.setVertexArray(vertices)
        geom.setColorArray(colors)
        geom.addPrimitiveSet(osg.DrawArrays(GL_LINE_STRIP,0,vertices.size()))

        geode = osg.Geode()
        geode.addDrawable(geom)

        group.addChild(geode)
    else:
        vertices = osg.Vec3Array

        for i in range(numReps):
            group.addChild(createLabel3(osg.Vec3(pos),dv.length()*0.5,string))
            vertices.push_back(pos)
            pos += dv


        colors = osg.Vec4Array()
        colors.push_back(osg.Vec4(1.0,1.0,1.0,1.0))

        geom = osg.Geometry()
        geom.setVertexArray(vertices)
        geom.setColorArray(colors)
        geom.addPrimitiveSet(osg.DrawArrays(GL_LINE_STRIP,0,vertices.size()))

        geode = osg.Geode()
        geode.addDrawable(geom)

        group.addChild(geode)

    return group

def createScene():
    root = osg.Group()

    # numReps = 3333
    numReps = 10
    root.addChild(createAxis(osg.Vec3(0.0,0.0,0.0),osg.Vec3(1000.0,0.0,0.0),numReps,osg.AutoTransform.ROTATE_TO_CAMERA,"ROTATE_TO_CAMERA"))
    root.addChild(createAxis(osg.Vec3(0.0,0.0,0.0),osg.Vec3(0.0,1000.0,0.0),numReps,osg.AutoTransform.ROTATE_TO_SCREEN,"ROTATE_TO_SCREEN"))
    root.addChild(createAxis(osg.Vec3(0.0,0.0,0.0),osg.Vec3(0.0,0.0,1000.0),numReps,osg.AutoTransform.NO_ROTATION,"NO_ROTATION"))    

    return root

def main(argv):

    # use an ArgumentParser object to manage the program arguments.
    arguments =  osg.ArgumentParser(argv)
    
    # set up the usage document, in case we need to print out how to use this program.
    arguments.getApplicationUsage().setDescription(arguments.getApplicationName()+" is the standard OpenSceneGraph example which loads and visualises 3d models.")
    arguments.getApplicationUsage().setCommandLineUsage(arguments.getApplicationName()+" [options] filename ...")
    arguments.getApplicationUsage().addCommandLineOption("-h or --help","Display this information")
    

    # construct the viewer.
    viewer = osgProducer.Viewer(arguments)

    # set up the value with sensible default event handlers.
    viewer.setUpViewer(osgProducer.Viewer.STANDARD_SETTINGS)

    # get details on keyboard and mouse bindings used by the viewer.
    viewer.getUsage(arguments.getApplicationUsage())

    # if user request help write it out to cout.
    if arguments.read("-h") or arguments.read("--help"):
        arguments.getApplicationUsage().write()
        return 1

    # any option left unread are converted into errors to write out later.
    arguments.reportRemainingOptionsAsUnrecognized()

    # report any errors if they have occured when parsing the program aguments.
    if arguments.errors():
        arguments.writeErrorMessages(std.cout)
        return 1

    # set the scene to render
    viewer.setSceneData(createScene())

    # create the windows and run the threads.
    viewer.realize()

    while not viewer.done():
        # wait for all cull and draw threads to complete.
        viewer.sync()

        # update the scene by traversing it with the the update visitor which will
        # call all node update callbacks and animations.
        viewer.update()

        # fire off the cull and draw traversals of the scene.
        viewer.frame()

    # wait for all cull and draw threads to complete before exit.
    viewer.sync()

    return 0


if __name__ == "__main__":
    main(sys.argv)