source: trunk/packages/vizservers/nanovis/HeightMap.h @ 1984

#ifndef _HEIGHT_MAP_H_
#define _HEIGHT_MAP_H_

#include <Cg/cgGL.h>
#include <Cg/cg.h>
#include <R2/graphics/R2Geometry.h>
#include "TransferFunction.h"
#include "NvShader.h"
#include "Vector3.h"
#include <RenderContext.h>
#include "AxisRange.h"

namespace graphics {
    class RenderContext;
}

class Grid;

/**
 *@class HeightMap
 *@brief Create a surface from height map and line contour of the generated surface
 */

class HeightMap {
    unsigned int _vertexBufferObjectID;
    unsigned int _textureBufferObjectID;
    int _vertexCount;
    CGparameter _tfParam;
    CGparameter _opacityParam;
    R2Geometry* _contour;
    R2Geometry* _topContour;
    TransferFunction* _tfPtr;
    float _opacity;
    NvShader* _shader;
    int *_indexBuffer;
    int _indexCount;
    Vector3 _contourColor;
    
    bool _contourVisible;
    bool _topContourVisible;
    bool _visible;
    
    Vector3 _scale;
    Vector3 _centerPoint;
    int _xNum, _yNum;           // Number of elements x and y axes in grid.
    float *_heights;            // Array of original (unscaled) heights
                                // (y-values)
public :
    AxisRange xAxis, yAxis, zAxis, wAxis;
    static bool update_pending;
    static double valueMin, valueMax;

    /**
     *@brief Constructor
     */
    HeightMap();
    /**
     *@brief Destructor
     */
    ~HeightMap();

private :
    void createIndexBuffer(int xCount, int zCount, float* heights);
        Vector3* createHeightVertices(float startX, float startY, float endX, float endY, int xCount, int yCount, float* height);
        void reset();
public :
    void render(graphics::RenderContext* renderContext);
    void render_topview(graphics::RenderContext* renderContext, int render_width, int render_height);
    /**
     *@brief Create a height map with heigh values
     *@param startX a x position of the first height value
     *@param startY a y position of the first height value
     *@param endX a x position of the last height value
     *@param endY a y position of the last height value
     *@param xCount the number of columns of height values
     *@param yCount the number of rows of height values
     *@param height a pointer value adrressing xCount * yCount values of heights
     */
    void setHeight(float startX, float startY, float endX, float endY, 
                   int xCount, int yCount, float* height);

    /**
     *@brief Create a height map with a set of points
     *@param xCount the number of columns of height values
     *@param yCount the number of rows of height values
     */
    void setHeight(int xCount, int yCount, Vector3* heights);

    void MapToGrid(Grid *gridPtr);
    /**
     *@brief Define a color map for color shading of heightmap
     */
    void transferFunction(TransferFunction* tfPtr) {
        _tfPtr = tfPtr;
    }
    /**
     *@brief Get the color map defined for shading of this heightmap
     */
    TransferFunction *transferFunction(void) {
        return _tfPtr;
    }
    /**
     *@brief Set the visibility of the height map
     */
    void setVisible(bool visible) {
        _visible = visible;
    }

    /**
     *@brief Return the status of the visibility
     */
    bool isVisible() const {
        return _visible;
    }
    /**
     *@brief Set the visibility of the line contour
     */
    void setLineContourVisible(bool visible) {
        _contourVisible = visible;
    }

    void setTopLineContourVisible(bool visible) {
            _topContourVisible = visible;
    }

    void opacity(float opacity) {
        _opacity = opacity;
    }
    float opacity(void) {
        return _opacity;
    }
    /**
     *@brief Defind the color of the line contour
     */
    void setLineContourColor(float *rgb) {
        _contourColor.x = rgb[0];
        _contourColor.y = rgb[1];
        _contourColor.z = rgb[2];
    }
};

#endif