Isometric - BlitzCoder.net

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Socoder -> On Topic -> Isometric
Fri, 12 Jun 2009, 11:07
Afr0	What's the general algorithm for drawing tiles in an isometric map like a lot for The Sims? -=-=- Afr0 Games Project Dollhouse on Github - Please fork!
Fri, 12 Jun 2009, 14:55
Jayenkai	IIRC, it's something like... DrawX = (TileXGridWidth)+(TileY(GridWidth/2)) DrawY = (TileY*(GridHeight/2)) - (PhysicalHeight) or minuses, or something to that effect. Trial and error the thing, you should be able to figure it out.. -=-=- ''Load, Next List!''
Fri, 12 Jun 2009, 15:36
Afr0	Thanks! Yeah, I'll trial and error for a bit. At least I figured out how to get proper BMP data out of the SPR2 resources now! Actually... come to think about it, I don't think it is BMP data. More like... raw data, with pixels of color drawn for each line. Code: /// <summary> /// Processes all the binary data in a SPR2 chunk and returns it as a /// SPR2Chunk instance. GetChunks() must be called before calling this! /// </summary> /// <param name="ID">The ID of the SPR2 chunk.</param> /// <returns>A SPR2Chunk instance if successful - null otherwise.</returns> public SPR2Chunk ReadSPR2Chunk(int TypeNum) { SPR2Chunk Chunk = new SPR2Chunk(); IffChunk SPR2Data = GetSingleChunkFromMem("SPR2", TypeNum); int Version, SprCount, PaletteID, SprLoc; if (!SPR2Data.Type.ToUpper().Equals("SPR2")) return null; MemoryStream SPRData = new MemoryStream(SPR2Data.Data); BinaryReader Reader = new BinaryReader(SPRData); Version = Reader.ReadInt32(); SprCount = Reader.ReadInt32(); PaletteID = Reader.ReadInt32(); if (Version != 1000) { Reader.Close(); return null; } if (SprCount == 0) { Reader.Close(); return null; } Chunk.Version = Version; Chunk.SpriteCount = SprCount; Chunk.PaletteID = PaletteID; Chunk.Sprites = new Sprite[SprCount]; for (int i = 0; i < SprCount; i++) { // Now go to the requested sprite Reader.BaseStream.Seek((4 * i) + 12, SeekOrigin.Begin); SprLoc = Reader.ReadInt32(); Reader.BaseStream.Seek(SprLoc, SeekOrigin.Begin); //WORD == USHORT!!! ushort Width, Height, PaltID; ulong Flags; Width = Reader.ReadUInt16(); Height = Reader.ReadUInt16(); Flags = (ulong)Reader.ReadInt32(); PaltID = Reader.ReadUInt16(); //Some values that are apparently not very important... Reader.BaseStream.Seek(6, SeekOrigin.Current); IffChunk Palette = GetSingleChunkFromMem("PALT", PaltID); if (!Palette.Type.ToUpper().Equals("PALT")) Palette = GetSingleChunkFromMem("PALT", PaletteID); if (!Palette.Type.ToUpper().Equals("PALT")) { Reader.Close(); return null; } MemoryStream PaletteData = new MemoryStream(Palette.Data); BinaryReader PaltDataReader = new BinaryReader(PaletteData); //You now ignore Version, Count, Unused and Unused (4 x 4 bytes) PaltDataReader.BaseStream.Seek(16, SeekOrigin.Begin); Color[] PALT = new Color[256]; for (int j = 0; j < 256; j++) { byte[] Buffer = new byte[3]; Buffer[0] = PaltDataReader.ReadByte(); Buffer[1] = PaltDataReader.ReadByte(); Buffer[2] = PaltDataReader.ReadByte(); PALT[j] = Color.FromArgb(Buffer[0], Buffer[1], Buffer[2]); Buffer = null; } int X = 0, Y = 0; byte CurrentColor; Chunk.Sprites[i] = new Sprite(); Chunk.Sprites[i].Sprt = new Bitmap(Width, Height); while (true) { ushort CurWord = Reader.ReadUInt16(); ushort OpCode = (ushort)(CurWord >> 13); ushort Data = (ushort)(CurWord & 0x1fff); switch (OpCode) { case 0: //New line - 0x00 X = 0; Y++; break; case 1: //That's Z-buffer, then Pixel - 0x20 for (; Data != 0; Data--) { byte ZBuffer; ZBuffer = Reader.ReadByte(); CurrentColor = Reader.ReadByte(); Chunk.Sprites[i].Sprt.SetPixel(X, Y, PALT[CurrentColor]); X++; } //This is alignment Reader.BaseStream.Seek((Reader.BaseStream.Position) & 1, SeekOrigin.Current); break; case 2: //That's Z-buffer, then Pixel, then Alpha Channel - 0x40 for (; Data != 0; Data--) { byte ZBuffer, AChannel; ZBuffer = Reader.ReadByte(); CurrentColor = Reader.ReadByte(); AChannel = Reader.ReadByte(); if (Y >= Chunk.Sprites[i].Sprt.Height) Y = Chunk.Sprites[i].Sprt.Height - 1; Chunk.Sprites[i].Sprt.SetPixel(X, Y, PALT[CurrentColor]); X++; } //This is alignment Reader.BaseStream.Seek((Reader.BaseStream.Position) & 1, SeekOrigin.Current); break; case 3: //Skip pixels - 0x60 X += Data; break; case 4: //Skip lines - 0x80 X = 0; Y++; break; case 5: //End of sprite - 0xA0 break; case 6: //Pixels only - 0xC0 for (; Data != 0; Data--) { CurrentColor = Reader.ReadByte(); Chunk.Sprites[i].Sprt.SetPixel(X, Y, PALT[CurrentColor]); } //This is alignment Reader.BaseStream.Seek((Reader.BaseStream.Position) & 1, SeekOrigin.Current); break; default: //Error: Invalid token break; } if (OpCode == 5) //End of sprite - 0xA0 break; } PaltDataReader.Close(); } Reader.Close(); return Chunk; } --v Should be pretty self-explanatory! EDIT: In light of the recent pirate discussions; This code has not been reviewed or approved by neither EA nor Maxis at any point! The Sims and all it's trademarks, Maxis and Will Wright remains a property of EA. -=-=- Afr0 Games Project Dollhouse on Github - Please fork!
Sat, 13 Jun 2009, 07:06
shroom_monk	I tried something in isometric a little while back (very quickly gave up - old computer = very slow). The formulae I used effectively also allowed for the camera view to be rotated, while still being isometric. You store the 3D co-ords for everything, then assign an X and Y value in 2D to one unit of each 3D movement (X, Y and Z). So moving across on the 3D X axis would add a certain amount to X and Y, going up on the 3D Y axis would only affect the 2D Y axis, and adding to the 3D Z axis would add to the 2D X and take from the 2D Y. By changing the amount it adds or subtracts, you can change the angle. If that makes any sense, of course! If I find the source code, I'll post it. -=-=- A mushroom a day keeps the doctor away... Keep It Simple, Shroom!
Sat, 13 Jun 2009, 16:28
mindstorm8191	I've tried isometric in a few games of my own. After all the work needed to get everything working and looking right, I almost don't recommend it to anyone. Its much easier to keep things in regular perspective. Only if you have a working game should you consider a new build in isometric view. -=-=- Vesuvius web game