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# Custom Rules for Rule Tile
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__Contribution by:__ [johnsoncodehk](https://github.com/johnsoncodehk)
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Use this template script to create new custom [Rule Tiles](RuleTile.md) with matching options that differ from the Rule Tile’s [default options](RuleTile.md#Usage) (namely **This** and **Not This**). This creates selectable options for each Rule in your custom __Rule Tile__.
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## Template features
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- Inheritable Rule Tile.
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- Customizable properties.
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- Expand or rewrite both neighbor Rules and the GUI display of the Rules.
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- Usable with by [RuleOverrideTile](RuleOverrideTile.md)
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- Create from a template script.
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- Neighbor Rules tooltips.
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- Backward compatible.
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## Creating a custom Rule Tile script
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Create a Custom Rule Tile script by going to __Assets > Create > Custom Rule Tile Script__. Name the newly created file when prompted. After creating the file, you can edit it to add new matching options and custom algorithms for testing matches.
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### Examples
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- Custom properties:
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```csharp
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public class MyTile : RuleTile {
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public string tileId;
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public bool isWater;
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}
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```
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- Custom rules:
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```csharp
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public class MyTile : RuleTile<MyTile.Neighbor> {
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public class Neighbor {
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public const int MyRule1 = 0;
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public const int MyRule2 = 1;
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}
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public override bool RuleMatch(int neighbor, TileBase tile) {
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switch (neighbor) {
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case Neighbor.MyRule1: return false;
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case Neighbor.MyRule2: return true;
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}
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return true;
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}
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}
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```
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- Expansion rules
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```csharp
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public class MyTile : RuleTile<MyTile.Neighbor> {
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public class Neighbor : RuleTile.TilingRule.Neighbor {
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// 0, 1, 2 is using in RuleTile.TilingRule.Neighbor
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public const int MyRule1 = 3;
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public const int MyRule2 = 4;
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}
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public override bool RuleMatch(int neighbor, TileBase tile) {
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switch (neighbor) {
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case Neighbor.MyRule1: return false;
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case Neighbor.MyRule2: return true;
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}
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return base.RuleMatch(neighbor, tile);
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}
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}
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```
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- Siblings Tile 1
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```csharp
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public class MyTile : RuleTile<MyTile.Neighbor> {
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public List<TileBase> sibings = new List<TileBase>();
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public class Neighbor : RuleTile.TilingRule.Neighbor {
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public const int Sibing = 3;
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}
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public override bool RuleMatch(int neighbor, TileBase tile) {
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switch (neighbor) {
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case Neighbor.Sibing: return sibings.Contains(tile);
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}
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return base.RuleMatch(neighbor, tile);
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}
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}
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```
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- Siblings Tile 2
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```csharp
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public class MyTile : RuleTile<MyTile.Neighbor> {
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public int siblingGroup;
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public class Neighbor : RuleTile.TilingRule.Neighbor {
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public const int Sibing = 3;
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}
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public override bool RuleMatch(int neighbor, TileBase tile) {
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MyTile myTile = tile as MyTile;
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switch (neighbor) {
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case Neighbor.Sibing: return myTile && myTile.siblingGroup == siblingGroup;
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}
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return base.RuleMatch(neighbor, tile);
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}
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}
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``` |
