///
///    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 ILNumerics.Drawing.Marker; 
using ILNumerics.Drawing; 
using OpenTK.Graphics; 
using OpenTK.Graphics.OpenGL;
using OpenTK.Platform;
using OpenTK.Graphics.OpenGL.Enums;
using ILNumerics.Drawing.Labeling; 
using ILNumerics.Drawing.Shapes; 


namespace ILNumerics.Drawing.Platform.OpenGL {
    public class ILOGLStyledMarkerShape : ILStyledMarkerShape {

        #region constructors
        internal ILOGLStyledMarkerShape (ILPanel panel, MarkerStyle style) 
            : base (panel,style) { }
        #endregion

        #region public interface 

        internal override void Draw(ILRenderProperties p, ILMarker marker, C4bV3f[] vertices, int startID, int vertCount) {
            // some implementations need to know we are drawing in 
            // screen coords, vertcount give the signal: -1
            if (vertCount == 0 || vertCount < -1) return; 
            if (m_style != MarkerStyle.None) {
               if (m_style == MarkerStyle.Dot || m_style == MarkerStyle.Square) {
                    SetupMarkerStyle(marker);
                    unsafe { 
                        fixed(C4bV3f* pVertArr = vertices) {
                            //GL.TexCoord2(0.5,0.5); 
                            GL.InterleavedArrays(InterleavedArrayFormat.V2f,0,(IntPtr)pVertArr); 
                            GL.DrawArrays(BeginMode.Points,0,Math.Abs(vertCount));
                        }
                    }
                } else {
                    #region draw textured points (slow version: textured quads)
                    string markerTexKey = Hash(); 
                    ILTextureData texData; 
                    if (!m_panel.TextureManager.Exists(markerTexKey)) {
                        CacheMarkerBitmap();
                    }
                    texData = m_panel.TextureManager.GetTextureItem(markerTexKey,true); 
        System.Diagnostics.Debug.Assert(texData != null,"The texture for marker was expected to exist in texture storage, but it was not found!"); 
                    // prepare for plotting
                    GL.Color3(marker.Color); 
                    GL.PushAttrib(AttribMask.AllAttribBits);

                    GL.Enable(EnableCap.Texture2D);
                    GL.Enable(EnableCap.Blend);
                    GL.BlendFunc(BlendingFactorSrc.SrcAlpha, BlendingFactorDest.OneMinusSrcAlpha);
                    GL.Disable(EnableCap.DepthTest);
                    RectangleF rectF = texData.TextureRectangle; 
                    float w,h;
                    ILClippingData clip = m_panel.Limits; 
                    float s05x; 
                    float s05y; 
                    //if (m_marker.)
                    s05x = Math.Abs(marker.Size * clip.WidthF / (m_panel.ClientSize.Width)); 
                    s05y = Math.Abs(marker.Size * clip.HeightF / (m_panel.ClientSize.Height)); 
                    if (vertCount > 0) {
                        #region determine size for markers in world coords (graph limits)

                        #endregion
                        // draw all markers using quads. 
                        // this is slow! Todo: replace by point sprites! 
                        GL.Begin(BeginMode.Quads); 
                        for (int i = 0; i < vertCount; i++) {
                            w = vertices[i].XPosition; 
                            h = vertices[i].YPosition;           
                            if (m_panel.ClipViewData && (w < clip.XMin || w > clip.XMax || h < clip.YMin || h > clip.YMax)) 
                                continue; 
                            w -= s05x;             
                            h -= s05y; 
                            GL.TexCoord2(rectF.Left,rectF.Bottom);              
                            GL.Vertex2(w,h);                                    // ul
                            GL.TexCoord2(rectF.Left,rectF.Top);                 
                            GL.Vertex2(w,h + 2 * s05y);                         // bl
                            w += 2 * s05x;                                
                            GL.TexCoord2(rectF.Right,rectF.Top);                
                            GL.Vertex2(w,h + 2 * s05y);                         // br
                            GL.TexCoord2(rectF.Right,rectF.Bottom);             
                            GL.Vertex2(w,h);                                    // tr
                        }
                        GL.End(); 
                    } else if (vertCount == -1) {
                        GL.Begin(BeginMode.Quads); 
                            w = vertices[0].XPosition - marker.Size; 
                            h = vertices[0].YPosition - marker.Size;           
                            GL.TexCoord2(rectF.Left,rectF.Top);              
                            GL.Vertex2(w,h);                                    // ul
                            GL.TexCoord2(rectF.Left,rectF.Bottom);                 
                            GL.Vertex2(w,h + marker.Size * 2);                  // bl
                            w += marker.Size;                                
                            GL.TexCoord2(rectF.Right,rectF.Bottom);                
                            GL.Vertex2(w,h + marker.Size * 2);                  // br
                            GL.TexCoord2(rectF.Right,rectF.Top);             
                            GL.Vertex2(w,h);                                    // tr
                        GL.End(); 
                    }
                    GL.PopAttrib();
                    #endregion
                }
           }
        } 
        #endregion

        #region private helper
        private void SetupMarkerStyle(ILMarker marker) {
            GL.PointSize(marker.Size); 
            GL.Color3(marker.Color);
            GL.Disable(EnableCap.DepthTest);
            switch (m_style) {
                case MarkerStyle.Dot:
                    GL.Enable(EnableCap.PointSmooth); 
                    break;
                case MarkerStyle.Square:
                    GL.Disable(EnableCap.PointSmooth); 
                    break;
                case MarkerStyle.None:
                    GL.PointSize(0.0f); 
                    break;
                default:
                    throw new NotImplementedException(); 
            }
        }

        #endregion

    }
}