I am trying rewrite code from JS to Java. The code is Diamond square algorithm.
Source is: http://www.playfuljs.com/realistic-terrain-in-130-lines/
I rewrite code, but my code not working...
Output is bad.
My code in Java is:
public class MapGenerator {
public static void main(String[] args) {
MapGenerator mg = new MapGenerator(9);
mg.generate();
mg.printMap();
}
private int size, max;
double[] map;
int[][] matrix;
public MapGenerator(int detail) {
this.size = (int) Math.pow(2, detail) + 1;
this.max = this.size - 1;
this.map = new double[this.size * this.size];
}
private double get(int x, int y) {
if (x < 0 || x > this.max || y < 0 || y > this.max) {
return -1;
}
return this.map[x + this.size * y];
}
private void set(int x, int y, double val) {
this.map[x + this.size * y] = val;
}
public void generate() {
set(0, 0, max);
set(this.max, 0, max / 2);
set(this.max, this.max, 0);
set(0, this.max, max / 2);
divide(this.max);
buildMatrix();
saveTerrain(0, 0, 0, 0, matrix, "vystup.ter");
}
private void buildMatrix() {
matrix = new int[size][size];
for (int i = 0; i < matrix.length; i++) {
for (int j = 0; j < matrix[0].length; j++) {
matrix[i][j] = (int) map[i + j];
}
}
}
private void divide(int size) {
//?
double roughness = 0.7;
int x, y, half = size / 2;
double scale = roughness * size;
if (half < 1) {
return;
}
for (y = half; y < max; y += size) {
for (x = half; x < max; x += size) {
square(x, y, half, Library.randInt(0, 100) * scale * 2 - scale);
}
}
for (y = 0; y <= max; y += half) {
for (x = (y + half) % size; x <= max; x += size) {
diamond(x, y, half, Library.randInt(0, 100) * scale * 2 - scale);
}
}
divide(size / 2);
}
private void square(int x, int y, int size, double offset) {
double tmp_1 = get(x, y - size); // top
double tmp_2 = get(x + size, y); // right
double tmp_3 = get(x, y + size); // bottom
double tmp_4 = get(x - size, y); // left
set(x, y, ((tmp_1 + tmp_2 + tmp_3 + tmp_4) / 4.0) + offset);
}
private void diamond(int x, int y, int size, double offset) {
double tmp_1 = get(x, y - size); // top
double tmp_2 = get(x + size, y); // right
double tmp_3 = get(x, y + size); // bottom
double tmp_4 = get(x - size, y); // left
set(x, y, ((tmp_1 + tmp_2 + tmp_3 + tmp_4) / 4.0) + offset);
}
public void printMap() {
for (int i = 0; i < matrix.length; i++) {
for (int j = 0; j < matrix[0].length; j++) {
System.out.print(matrix[i][j] + " ");
}
System.out.println("");
}
}
public void saveTerrain(int canonX, int canonY, int targetX, int targetY,
int[][] terrain, String fName) {
int height = terrain.length;
int width = terrain[0].length;
DataOutputStream fout = null;
try {
// Samotný zápis dat
fout = new DataOutputStream(new FileOutputStream(fName));
fout.writeInt(width);
fout.writeInt(height);
fout.writeInt(canonX);
fout.writeInt(canonY);
fout.writeInt(targetX);
fout.writeInt(targetY);
for (int y = 0; y < height; ++y) {
for (int x = 0; x < width; ++x) {
fout.writeInt(terrain[y][x]);
}
}
} /*
* Následuje pouze zavření souboru a ošetrení výjimek
*/ catch (FileNotFoundException e) {
System.err.println("Nepovedlo se otevrit vystupni soubor.");
} catch (IOException e) {
System.err.println("Nepovedlo se zapsat vystupni soubor.");
} finally {
try {
if (fout != null) {
fout.close();
}
} catch (IOException e) {
System.err.println("Nepovedlo se uzavrit vystupni soubor.");
}
}
}
}
Can anyone help me?
Output of algo is int[][] which i visualise using another program to image..
Visualise of output:
And this is how it should look
I am not getting error, but the output is wrong. Thanks for help.
