HeightMap.cpp

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#include "heightmap.h"

HeightMap::HeightMap()
{
}

bool HeightMap::Load(string FileName)
{
    string tmp;

    ifstream t_in(string(FileName + ".dim").c_str(),ios_base::in);
    if(!t_in.is_open())
        return false;
    
    t_in >> tmp >> x_dim >> tmp >> z_dim >> tmp >> x_spacing >> tmp >> z_spacing >> tmp
     >> h_color.color[0] >> h_color.color[1] >> h_color.color[2] >> h_color.color[3];

    h_map = new float*[x_dim];
    for (int j = 0; j < x_dim; j++)
        h_map[j] = new float[z_dim];

    normalA = new glVector*[x_dim];
    for (int j = 0; j < x_dim; j++)
        normalA[j] = new glVector[z_dim];
    normalB = new glVector*[x_dim];
    for (int j = 0; j < x_dim; j++)
        normalB[j] = new glVector[z_dim];

    ifstream v_in(string(FileName + ".ht").c_str(),ios_base::in);
    if(!v_in.is_open())
        return false;
    
    v_in >> tmp;
    float tmp2;
    for(int i = 0; i < z_dim; i++)
        for(int j = 0; j < z_dim; j++)
        {
            v_in >> tmp2;
            h_map[j][i] = tmp2;
        }
        
    for(int b = 0; b < z_dim - 1; b++)
        for(int a = 0; a < x_dim - 1; a++)
        {
            float scale_a = float(a) * x_spacing;
            float scale_b = float(b) * z_spacing;

            Vertex pt1 = glVector(scale_a, h_map[a][b], scale_b);
            Vertex pt2 = glVector(scale_a, h_map[a][b+1], scale_b + z_spacing);
            Vertex pt3 = glVector(scale_a + x_spacing, h_map[a+1][b], scale_b);
            Vertex pt4 = glVector(scale_a + x_spacing, h_map[a+1][b+1], scale_b + z_spacing);

            glVector v1 = glVector(pt1 - pt2);
            glVector v2 = glVector(pt1 - pt3);
            normalA[a][b].SetVector(!glVector(v1 % v2));
            
            v1 = glVector(pt2 - pt3);
            v2 = glVector(pt4 - pt2);
            normalB[a][b].SetVector(!glVector(v1 % v2));
        }
    return true;
}

void HeightMap::Draw()
{
    glMaterialfv(GL_FRONT, GL_DIFFUSE, h_color.color);
    glBegin(GL_TRIANGLES);

    for(int b = 0; b < z_dim - 1; b++)
        for(int a = 0; a < x_dim - 1; a++)
        {
            float scale_a = float(a) * x_spacing;
            float scale_b = float(b) * z_spacing;
            
            glNormal3fv(normalA[a][b].data);
            glVertex3f(scale_a, h_map[a][b], scale_b);
            glVertex3f(scale_a, h_map[a][b+1], scale_b+z_spacing);
            glVertex3f(scale_a+x_spacing, h_map[a+1][b], scale_b);

            glNormal3fv(normalB[a][b].data);
            glVertex3f(scale_a+x_spacing, h_map[a+1][b], scale_b);
            glVertex3f(scale_a, h_map[a][b+1], scale_b+z_spacing);
            glVertex3f(scale_a+x_spacing, h_map[a+1][b+1], scale_b+z_spacing);
        }
    glEnd();
}
    

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