public static TileSet makeTileset(Texture texture, bool collisions)
{
BitMap original_bitmap = null;
BitMap bitmap = null;
if (collisions)
{
var image = texture.GetData();
original_bitmap = new BitMap();
original_bitmap.CreateFromImageAlpha(image, .001f);
// bitmap with borders is needed to shrink mask later
bitmap = new BitMap();
bitmap.Create(new Vector2((TILE_WIDTH + 2) * TILESET_WIDTH, (TILE_HEIGHT + 2) * TILESET_HEIGHT));
bitmap.SetBitRect(new Rect2(new Vector2(0, 0), bitmap.GetSize()), true);
}
var ts = new TileSet();
int i = 0;
for (int y = 0; y < TILESET_HEIGHT; y++)
{
for (int x = 0; x < TILESET_WIDTH; x++)
{
ts.CreateTile(i);
ts.TileSetTexture(i, texture);
var region = new Rect2(x * TILE_WIDTH, y * TILE_HEIGHT, TILE_WIDTH, TILE_HEIGHT);
ts.TileSetRegion(i, region);
if (collisions)
{
for (int m = 0; m < TILE_WIDTH; m++)
{
for (int n = 0; n < TILE_HEIGHT; n++)
{
bitmap.SetBit(new Vector2(x * (TILE_WIDTH + 2) + m + 1, y * (TILE_HEIGHT + 2) + n + 1),
original_bitmap.GetBit(new Vector2(x * TILE_WIDTH + m, y * TILE_HEIGHT + n)));
}
}
var bitmap_region = new Rect2(x * (TILE_WIDTH + 2) + 1, y * (TILE_HEIGHT + 2) + 1, TILE_WIDTH, TILE_HEIGHT);
var polygons = tilePolygons(bitmap, bitmap_region);
int c = 0;
foreach (Vector2[] polygon in polygons)
{
if (isConvex(polygon))
{
var collision = new ConvexPolygonShape2D();
collision.SetPointCloud(polygon);
ts.TileSetShape(i, c++, collision);
}
else
{
int[] triangles = Geometry.TriangulatePolygon(polygon);
for (int t = 0; t < triangles.Length; t += 3)
{
Vector2[] triangle = { polygon[triangles[t]], polygon[triangles[t + 1]], polygon[triangles[t + 2]] };
var collision = new ConvexPolygonShape2D();
collision.SetPointCloud(triangle);
ts.TileSetShape(i, c++, collision);
}
}
}
}
i++;
}
}
return(ts);
}
