///
///    This file is part of ILNumerics Community Edition.
///
///    ILNumerics Community Edition - high performance computing for applications.
///    Copyright (C) 2006 - 2012 Haymo Kutschbach, http://ilnumerics.net
///
///    ILNumerics Community Edition is free software: you can redistribute it and/or modify
///    it under the terms of the GNU General Public License version 3 as published by
///    the Free Software Foundation.
///
///    ILNumerics Community Edition is distributed in the hope that it will be useful,
///    but WITHOUT ANY WARRANTY; without even the implied warranty of
///    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
///    GNU General Public License for more details.
///
///    You should have received a copy of the GNU General Public License
///    along with ILNumerics Community Edition. See the file License.txt in the root
///    of your distribution package. If not, see <http://www.gnu.org/licenses/>.
///
///    In addition this software uses the following components and/or licenses: 
///
///    =================================================================================
///    The Open Toolkit Library License
///    
///    Copyright (c) 2006 - 2009 the Open Toolkit library.
///    
///    Permission is hereby granted, free of charge, to any person obtaining a copy
///    of this software and associated documentation files (the "Software"), to deal
///    in the Software without restriction, including without limitation the rights to 
///    use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
///    the Software, and to permit persons to whom the Software is furnished to do
///    so, subject to the following conditions:
///
///    The above copyright notice and this permission notice shall be included in all
///    copies or substantial portions of the Software.
///
///    =================================================================================
///    

using System;
using System.Collections.Generic;
using System.Text;
using System.Drawing; 
using OpenTK; 
using OpenTK.Graphics; 
using OpenTK.Graphics.OpenGL; 
using OpenTK.Graphics.OpenGL.Enums; 
using ILNumerics.Drawing; 
using ILNumerics.Drawing.Interfaces; 
using ILNumerics.Drawing.Labeling; 


namespace ILNumerics.Drawing.Platform.OpenGL {
    /// <summary>
    /// OpenGL implementation of ILAxis (X axis)
    /// </summary>
    class ILOGLXAxis : ILOGLAxis {
        
        /// <summary>
        /// Constructor - this class should be created only from within ILNumerics assemblies! 
        /// </summary>
        /// <param name="clippingView">panels clipping view</param>
        /// <param name="layout">instance with layout informations</param>
        /// <param name="panel">the panel containing the axis</param>
        internal ILOGLXAxis (ILClippingData clippingView,
                            ILLayoutData layout,
                            ILOGLPanel panel)
            : base (AxisNames.XAxis,clippingView,layout,panel) {}

        /// <summary>
        /// draw all lines for the x axis 
        /// </summary>
        /// <param name="p">render properties</param>
        /// <param name="background">true: draw lines in the back only, false: draw foreground lines</param>
        protected override void iDrawAxis(ILRenderProperties p, bool background) {
            // create vertex data: main axis and ticks 
            if (m_visible) { 
                float tickLen;
                float x,y,z
                    ,xmin = m_clipping.XMin
                    ,xmax = m_clipping.XMax
                    ,ymin = m_clipping.YMin
                    ,ymax = m_clipping.YMax
                    ,zmin = m_clipping.ZMin
                    ,zmax = m_clipping.ZMax;
                tickLen = m_labeledTicks.TickFraction
                    * ((m_labeledTicks.Direction == TickDirection.Inside) ? m_clipping.HeightF : -m_clipping.HeightF);
                // must draw ticks? 
                bool drawticks = false, drawLines = false; 
                if (m_labeledTicks.Display == TickDisplay.BothSides) {
                    drawticks = true; 
                } else {
                    drawticks = (background && !m_layoutData.CameraPosition.LooksFromTop) 
                              ||(!background && m_layoutData.CameraPosition.LooksFromTop);  
                }
                x = xmin; z = zmin; 
                // determine which axis to draw: find front
                if (!m_layoutData.CameraPosition.LooksFromFront) {
                    tickLen *= -1.0f; 
                    y = ymax; 
                } else {
                    y = ymin; 
                }
                if (background) {
                    if (m_farLines.Visible) {
                        ILOGLPanel.SetupLineStyle(m_farLines);
                        drawLines = true;
                    }
                    if (y == ymax) y = ymin; else y = ymax; 
                    GL.Disable(EnableCap.DepthTest);
                    tickLen *= -1.0f;
                } else {
                    if (m_nearLines.Visible) {
                        ILOGLPanel.SetupLineStyle(m_nearLines); 
                        drawLines = true; 
                    }
                }
                if (drawLines) {
                    GL.Begin(BeginMode.Lines); 
                    GL.Vertex3(x,y,z); 
                    x = xmax;
                    GL.Vertex3(x,y,z); 
                    if (m_layoutData.CameraPosition.SinRho > 1e-5) {
                        z = zmax; 
                        GL.Vertex3(x,y,z); 
                        x = xmin;
                        GL.Vertex3(x,y,z); 
                    }
                    GL.End();
                }
                GL.Enable(EnableCap.DepthTest);
                if (drawticks && drawLines) {
                    #region create ticks 
                    if (!m_layoutData.CameraPosition.LooksFromTop) {
                        //tickLen *= -1.0f;
                        //y *= -1.0f;
                        if (background) 
                            GL.Color3(m_labeledTicks.NearColor);
                        else 
                            GL.Color3(m_labeledTicks.FarColor); 
                    } else {
                        if (background) 
                            GL.Color3(m_labeledTicks.FarColor);
                        else 
                            GL.Color3(m_labeledTicks.NearColor); 

                    }
                    //scale = m_clipping.ScaleToUnitCube().X; 
                    //offse = m_clipping.CenterToUnitCube().X; 
                    GL.Disable(EnableCap.LineStipple); 
                    GL.Begin(BeginMode.Lines);
                    foreach (LabeledTick tick in m_labeledTicks) {
                        if (tick.Position >= xmin 
                            && tick.Position <= xmax) {
                            x = tick.Position;
                            if (m_layoutData.CameraPosition.SinRho > 1e-5) {
                                z = zmax;
                                GL.Vertex3(x, y, z);
                                y += tickLen;
                                GL.Vertex3(x, y, z);
                            } else {
                                y += tickLen;
                            }
                            z = zmin; 
                            GL.Vertex3(x,y,z); 
                            y -= tickLen; 
                            GL.Vertex3(x,y,z);
                        }
                    }
                    GL.End();
                    #endregion
                }
                if (background && m_grid.Visible) 
                    drawGrid();
            }
        }

        /// <summary>
        /// draw all grid lines for axis
        /// </summary>
        protected override void drawGrid() {
            float x,y,z;
            float zmax = m_clipping.ZMax;
            float zmin = m_clipping.ZMin;
            float ymin = m_clipping.YMin;
            float ymax = m_clipping.YMax;
            bool drawBottom = m_layoutData.CameraPosition.LooksFromTop; 
            ILOGLPanel.SetupLineStyle(m_grid); 
            GL.Disable(EnableCap.DepthTest);
            GL.Enable(EnableCap.Blend); 
            GL.Begin(BeginMode.Lines);
            if (m_layoutData.CameraPosition.LooksFromFront) {
                y = ymax; 
            } else {
                y = ymin; 
            }
            foreach (LabeledTick tick in m_labeledTicks) {
                if (tick.Position > m_clipping.XMin 
                    && tick.Position < m_clipping.XMax) {
                    x = tick.Position;
                    if (!m_layoutData.CameraPosition.Is2DView) {
                        z = zmax;
                        GL.Vertex3(x, y, z);
                        z = zmin;
                        GL.Vertex3(x, y, z);
                    } else {
                        z = zmin; 
                    }
                    if (drawBottom) {
                        GL.Vertex3(x,y,z);
                        if (y == ymin) y = ymax; else y = ymin; 
                        GL.Vertex3(x,y,z);
                        if (y == ymin) y = ymax; else y = ymin; 
                    }
                }
            }            
            GL.End(); 
        }



    }
}