Added more framework for the incense altar.

src/main/java/WayofTime/bloodmagic/incense/IncenseAltarComponent.java

@@ -0,0 +1,63 @@
+package WayofTime.bloodmagic.incense;
+
+import net.minecraft.block.Block;
+import net.minecraft.block.state.IBlockState;
+import net.minecraft.util.BlockPos;
+import net.minecraft.util.EnumFacing;
+
+public class IncenseAltarComponent
+{
+    public final BlockPos offsetPos;
+    public final Block block;
+    public final IBlockState state;
+
+    public IncenseAltarComponent(BlockPos offsetPos, Block block, IBlockState state)
+    {
+        this.offsetPos = offsetPos;
+        this.block = block;
+        this.state = state;
+    }
+
+    public boolean doesBlockMatch(Block block, IBlockState state)
+    {
+        return this.block == block && block.getMetaFromState(state) == this.block.getMetaFromState(this.state);
+    }
+
+    /**
+     * Base rotation is north.
+     */
+    public BlockPos getOffset(EnumFacing rotation)
+    {
+        return new BlockPos(this.getX(rotation), offsetPos.getY(), this.getZ(rotation));
+    }
+
+    public int getX(EnumFacing direction)
+    {
+        switch (direction)
+        {
+        case EAST:
+            return -this.offsetPos.getZ();
+        case SOUTH:
+            return -this.offsetPos.getX();
+        case WEST:
+            return this.offsetPos.getZ();
+        default:
+            return this.offsetPos.getX();
+        }
+    }
+
+    public int getZ(EnumFacing direction)
+    {
+        switch (direction)
+        {
+        case EAST:
+            return this.offsetPos.getX();
+        case SOUTH:
+            return -this.offsetPos.getZ();
+        case WEST:
+            return -this.offsetPos.getX();
+        default:
+            return this.offsetPos.getZ();
+        }
+    }
+}