#include "Land.h"
#include <cmath>

#include <iostream>
using namespace std;

const float SCALE_HEIGHT = 1;

Land::Land(int xdim, int ydim) {
    xDim = xdim;
    yDim = ydim;

    SetType(GL_TRIANGLES);

    return;
}

GLfloat Land::Height(int x, int y) {
    float scale = sqrt(xDim*xDim+yDim*yDim)/24;
    float d =sqrt(float(x)*x+y*y)/scale;
    //return(cos(d)*SCALE_HEIGHT) ;
    return 0;
}

void Land::Init() {
    Vertex vertex;
    int x,y;

    vertex.color = color;

    for(y=0;y<=yDim; y++) {
        for(x =0; x<=xDim ; x++) {
            vertex.position.x = x;
            vertex.position.y = Height(x,y);
            vertex.position.z = y;
            points.push_back(vertex);
        }
    }

    for(y = 0; y < yDim; y++) {
        for(x=0; x< xDim; x++) {
            index.push_back(y * (xDim+1) + x);
            index.push_back((y + 1) * (xDim+1) + x+1);
            index.push_back(y * (xDim+1) + x + 1);

            index.push_back(y * (xDim+1) + x);
            index.push_back((y + 1) * (xDim+1) + x);
            index.push_back((y + 1) * (xDim+1) + x+1);
        }
    }

    return;
}