BiomePainter.RegionUtil.RenderSurroundingRegions C# (CSharp) Method

        public static void RenderSurroundingRegions(RegionFile[,] regions, Bitmap terrain, Bitmap biomes, String[,] toolTips, Bitmap populate)
        {
            RenderSurroundingRegion(regions[0, 0], 30, 31, 30, 31, 0, 0, terrain, biomes, toolTips, populate);
            RenderSurroundingRegion(regions[1, 0], 0, 31, 30, 31, OFFSETX, 0, terrain, biomes, toolTips, populate);
            RenderSurroundingRegion(regions[2, 0], 0, 1, 30, 31, OFFSETX + WIDTH, 0, terrain, biomes, toolTips, populate);
            RenderSurroundingRegion(regions[0, 1], 30, 31, 0, 31, 0, OFFSETY, terrain, biomes, toolTips, populate);

            RenderSurroundingRegion(regions[2, 1], 0, 1, 0, 31, OFFSETX + WIDTH, OFFSETY, terrain, biomes, toolTips, populate);
            RenderSurroundingRegion(regions[0, 2], 30, 31, 0, 1, 0, OFFSETY + HEIGHT, terrain, biomes, toolTips, populate);
            RenderSurroundingRegion(regions[1, 2], 0, 31, 0, 1, OFFSETX, OFFSETY + HEIGHT, terrain, biomes, toolTips, populate);
            RenderSurroundingRegion(regions[2, 2], 0, 1, 0, 1, OFFSETX + WIDTH, OFFSETY + HEIGHT, terrain, biomes, toolTips, populate);
        }

        private void lstRegions_SelectedIndexChanged(object sender, EventArgs e)
        {
            if (world == null || lstRegions.SelectedIndex == lastSelectedRegionIndex)
            {
                return;
            }

            if (!SaveIfNecessary())
            {
                lstRegions.SelectedIndex = lastSelectedRegionIndex;
                return;
            }

            history.FilterOutType(typeof(BiomeAction));
            history.FilterOutType(typeof(PopulateAction));

            Match  m          = Regex.Match(lstRegions.SelectedItem.ToString(), @"Region (-?\d+), (-?\d+)");
            int    x          = int.Parse(m.Groups[1].Value);
            int    z          = int.Parse(m.Groups[2].Value);
            String pathFormat = String.Format("{0}{1}r.{{0}}.{{1}}.mca", world.GetRegionDirectory(dim), Path.DirectorySeparatorChar);

            UpdateStatus("Reading region file");
            region = new RegionFile(String.Format(pathFormat, x, z));
            history.RecordBiomeState(region, "Initial Biomes");
            history.RecordPopulateState(region, "Initial Populate Flags");
            history.SetLastSaveActions();
            imgRegion.Reset();
            UpdateStatus("Generating terrain map");
            RegionUtil.RenderRegionTerrain(region, imgRegion.Layers[MAPLAYER].Image, false);
            UpdateStatus("Generating biome map");
            RegionUtil.RenderRegionBiomes(region, imgRegion.Layers[BIOMELAYER].Image, imgRegion.ToolTips, false);
            UpdateStatus("");
            RegionUtil.RenderRegionChunkstobePopulated(region, imgRegion.Layers[POPULATELAYER].Image, false);
            imgRegion.Redraw();

            RegionFile[,] surrounding = new RegionFile[3, 3];
            UpdateStatus("Reading surrounding chunks");
            surrounding[0, 0] = new RegionFile(String.Format(pathFormat, x - 1, z - 1), 30, 31, 30, 31);
            surrounding[1, 0] = new RegionFile(String.Format(pathFormat, x, z - 1), 0, 31, 30, 31);
            surrounding[2, 0] = new RegionFile(String.Format(pathFormat, x + 1, z - 1), 0, 1, 30, 31);
            surrounding[0, 1] = new RegionFile(String.Format(pathFormat, x - 1, z), 30, 31, 0, 31);
            surrounding[1, 1] = null;
            surrounding[2, 1] = new RegionFile(String.Format(pathFormat, x + 1, z, 0, 1, 0, 31));
            surrounding[0, 2] = new RegionFile(String.Format(pathFormat, x - 1, z + 1), 30, 31, 0, 1);
            surrounding[1, 2] = new RegionFile(String.Format(pathFormat, x, z + 1), 0, 31, 0, 1);
            surrounding[2, 2] = new RegionFile(String.Format(pathFormat, x + 1, z + 1), 0, 1, 0, 1);
            UpdateStatus("Generating map for surrounding chunks");
            RegionUtil.RenderSurroundingRegions(surrounding, imgRegion.Layers[MAPLAYER].Image, imgRegion.Layers[BIOMELAYER].Image, imgRegion.ToolTips, imgRegion.Layers[POPULATELAYER].Image);
            UpdateStatus("");
            imgRegion.Redraw();

            lastSelectedRegionIndex = lstRegions.SelectedIndex;
        }