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TerrainGenerator.cpp
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TerrainGenerator.cpp
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//Created by: Jesse Herzenach
//Date updated: 10/05/15
//Last update by: N/A
//Reason for update:N/A
#include <iostream>
#include <iomanip>
#include <fstream>
#include <math.h>
#include "TerrainGenerator.h"
void TerrainGenerator::generateTerrain(){
interpretMap(m_curFractal->generateFractal(m_curBiome));
//m_curFractal->print();
}
void TerrainGenerator::draw(){
/*for (int i = 0; i < 129; i++){
for (int j = 0; j < 129; j++){
m_curMap[i][j].Draw();
}
}
*/
m_curFractal->drawGrayscale();
}
void TerrainGenerator::interpretMap(float *heightMap[]){
int TileSize = 4;
int *interpretedData[129];
m_curMap.resize(129, std::vector<TerrainTile>(129, TerrainTile(NULL, 0, 0, Grass, 0, 0)));
for (int i = 0; i < 129; i++){
interpretedData[i] = new int[129];
}
std::ofstream mapFile;
mapFile.open("terrainMap.txt");
for (int i = 0; i < 129; i++){
for (int j = 0; j < 129; j++){
if (heightMap[i][j] >= 70.0f){
interpretedData[i][j] = 3;
m_curMap[i][j] = TerrainTile(NULL, i * TileSize, j * TileSize, Grass, TileSize, TileSize, true);
}
else if (heightMap[i][j] <= 60.0f){
interpretedData[i][j] = 1;
m_curMap[i][j] = TerrainTile(NULL, i * TileSize, j * TileSize, Water, TileSize, TileSize, true);
}
else{
interpretedData[i][j] = 2;
m_curMap[i][j] = TerrainTile(NULL, i * TileSize, j * TileSize, Dirt, TileSize, TileSize, true);
}
mapFile << interpretedData[i][j];
}
mapFile << std::endl;
}
mapFile.close();
}
void Fractal::drawGrayscale()
{
for (int i = 0; i < 129; i++){
for (int j = 0; j < 129; j++){
float height = fmod(m_heightMap[i][j] * 4, 255);
al_draw_filled_rectangle(i * 4, j * 4, (i * 4) + 4, (j * 4) + 4, al_map_rgb(height, height, height));
}
}
}
float** Fractal::generateFractal(Biome *curBiome){
initializeHeightmap();
setInitialConditions(curBiome);
diamond(m_size - 1, 0, 0, 200); //calling diamond will then recursively call square->diamond until the entire height map is generated
print(); //prints raw height map to text file
return m_heightMap;
}
void Fractal::setInitialConditions(Biome *curBiome){
//this will contain the initial conditions for each of the primary biomes
//I will add a conditional to declare additional constants other than the four corner points
m_heightMap[0][0] = -20.0f;
m_heightMap[0][m_size - 1] = -20.0f;
m_heightMap[m_size - 1][0] = -20.0f;
m_heightMap[m_size - 1][m_size - 1] = -20.0f;
int X = 0;
int Y = 0;
}
void Fractal::initializeHeightmap(){
for (int i = 0; i < m_size; i++){
m_heightMap[i] = new float[m_size];
}
for (int i = 0; i < m_size; i++){
for (int j = 0; j < m_size; j++){
m_heightMap[i][j] = 0.0f;
}
}
}
void Fractal::diamond(int size, int X, int Y, float range){
if (size <= 1){
return;
}
srand(time(NULL));
m_heightMap[Y + size / 2][X + size / 2] = (m_heightMap[Y][X] + m_heightMap[Y + size][X] + m_heightMap[Y][X + size] + m_heightMap[Y + size][X + size]) / 4 + (static_cast <float> (rand()) / (static_cast <float> (RAND_MAX / range)));
square(size, X, Y, range);
}
void Fractal::square(int size, int X, int Y, float range){
//top
if (size <= 1){
return;
}
if ((Y - 1) < 0){
m_heightMap[Y][X + size / 2] = (m_heightMap[Y][X] + m_heightMap[Y][X + size] + m_heightMap[Y + size / 2][X + size / 2]) / 3;
}
else{
m_heightMap[Y][X + size / 2] = (m_heightMap[Y][X] + m_heightMap[Y - 1][X + size / 2] + m_heightMap[Y][X + size] + m_heightMap[Y + size / 2][X + size / 2]) / 4;
}
//right
if ((X + size + 1) > m_size - 1){
m_heightMap[Y + size / 2][X + size] = (m_heightMap[Y][X + size] + m_heightMap[Y + size][X + size] + m_heightMap[Y + size / 2][X + size / 2]) / 3;
}
else{
m_heightMap[Y + size / 2][X + size] = (m_heightMap[Y][X + size] + m_heightMap[Y + size / 2][X + size + 1] + m_heightMap[Y + size][X + size] + m_heightMap[Y + size / 2][X + size / 2]) / 4;
}
//bottom
if ((Y + size + 1) > m_size - 1){
m_heightMap[Y + size][X + size / 2] = (m_heightMap[Y + size / 2][X + size / 2] + m_heightMap[Y + size][X + size] + m_heightMap[Y + size][X]) / 3;
}
else{
m_heightMap[Y + size][X + size / 2] = (m_heightMap[Y + size / 2][X + size / 2] + m_heightMap[Y + size + 1][X + size / 2] + m_heightMap[Y + size][X + size] + m_heightMap[Y + size][X]) / 4;
}
//left
if ((X - 1) < 0){
m_heightMap[Y + size / 2][X] = (m_heightMap[Y][X] + m_heightMap[Y + size / 2][X + size / 2] + m_heightMap[Y + size][X]) / 3;
}
else{
m_heightMap[Y + size / 2][X] = (m_heightMap[Y][X] + m_heightMap[Y + size / 2][X + size / 2] + m_heightMap[Y + size][X] + m_heightMap[Y + size / 2][X - 1]) / 4;
}
range *= pow(2, -roughness);
diamond(size / 2, X, Y, range);
diamond(size / 2, X + size / 2, Y, range);
diamond(size / 2, X, Y + size / 2, range);
diamond(size / 2, X + size / 2, Y + size / 2, range);
}
void Fractal::print(){
std::ofstream mapFile;
mapFile.open("rawHeight.txt");
for (int i = 0; i < m_size; i++){
for (int j = 0; j < m_size; j++){
mapFile << std::setprecision(2) << std::fixed << m_heightMap[i][j] << " ";
}
mapFile << std::endl;
}
}