/// <summary>
/// Saves the height map data at the specified position and area.
/// </summary>
/// <returns>Undo buffer information.</returns>
/// <param name="terrain">Terrain to get undo information from.</param>
/// <param name="xs">X position of top-left corner.</param>
/// <param name="ys">Y position of top-left corner.</param>
/// <param name="dimension">Dimension of undo area.</param>
public Documents.SceneDocument.TerrainDeformUndoInfo?GetHeightMapUndo(QuadTerrainComponent terrain, int xs, int ys, int dimension)
{
// Create undo array
float[] undo = new float[dimension * dimension];
// Get data
float[] data = terrain.GetHeight();
// Capture all valid height pixels
for (int y = ys; y < ys + dimension; y++)
{
// Cannot go out of bounds
if (y < 0 || y >= mapDimension)
{
continue;
}
for (int x = xs; x < xs + dimension; x++)
{
// Cannot go out of bounds
if (x < 0 || x >= mapDimension)
{
continue;
}
// Get height pixel
float value = data[y * mapDimension + x];
// Save height pixel
int xd = (x - xs);
int yd = (y - ys);
if (xd < 0 || xd >= dimension)
{
continue;
}
if (yd < 0 || yd >= dimension)
{
continue;
}
undo[yd * dimension + xd] = value;
}
}
// Create undo information
Documents.SceneDocument.TerrainDeformUndoInfo undoInfo = new Documents.SceneDocument.TerrainDeformUndoInfo
{
TerrainEditor = this,
TerrainComponent = terrain,
HeightMap = heightMapData,
UndoBuffer = undo,
Position = new Microsoft.Xna.Framework.Point(xs, ys),
Dimension = dimension,
};
return(undoInfo);
}
/// <summary>
/// Restores undo information to the height map.
/// </summary>
/// <param name="undoInfo">Undo information.</param>
public void RestoreHeightMapUndo(Documents.SceneDocument.TerrainDeformUndoInfo undoInfo)
{
// Get area of undo operation
int xs = undoInfo.Position.X;
int ys = undoInfo.Position.Y;
int dimension = undoInfo.Dimension;
// Set all valid height pixels
QuadTerrainComponent terrain = undoInfo.TerrainComponent;
float[] data = terrain.GetHeight();
for (int y = ys; y < ys + dimension; y++)
{
// Cannot go out of bounds
if (y < 0 || y >= mapDimension)
{
continue;
}
for (int x = xs; x < xs + dimension; x++)
{
// Cannot go out of bounds
if (x < 0 || x >= mapDimension)
{
continue;
}
// Get height pixel
int xd = (x - xs);
int yd = (y - ys);
if (xd < 0 || xd >= dimension)
{
continue;
}
if (yd < 0 || yd >= dimension)
{
continue;
}
float value = undoInfo.UndoBuffer[yd * dimension + xd];
// Set height pixel
data[y * terrain.MapDimension + x] = value;
}
}
// Set height back in editor if this is active terrain
if (terrain == this.terrain)
{
heightMapData = data;
UpdatePreview();
}
// Set data back on terrain
terrain.SetHeight(data);
}
