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using Pathfinding.Graphs.Grid.Rules;
using UnityEditor;
using UnityEngine;
namespace Pathfinding {
/// <summary>Editor for the <see cref="RuleTexture"/> rule</summary>
[CustomGridGraphRuleEditor(typeof(RuleTexture), "Texture")]
public class RuleTextureEditor : IGridGraphRuleEditor {
protected static readonly string[] ChannelUseNames = { "None", "Penalty", "Height", "Walkability and Penalty", "Walkability" };
public void OnInspectorGUI (GridGraph graph, GridGraphRule rule) {
var target = rule as RuleTexture;
target.texture = GraphEditor.ObjectField(new GUIContent("Texture"), target.texture, typeof(Texture2D), false, true) as Texture2D;
GUILayout.BeginHorizontal();
GUILayout.FlexibleSpace();
if (GUILayout.Button("Generate Reference")) {
SaveReferenceTexture(graph);
EditorUtility.DisplayDialog("Reference texture saved", "A texture has been saved in which every pixel corresponds to one node. The red channel represents if a node is walkable or not. The green channel represents the (normalized) Y coordinate of the nodes.", "Ok");
}
GUILayout.EndHorizontal();
if (target.texture != null) {
string path = AssetDatabase.GetAssetPath(target.texture);
if (path != "") {
var importer = AssetImporter.GetAtPath(path) as TextureImporter;
if (importer != null && !importer.isReadable) {
if (GraphEditor.FixLabel("Texture is not readable")) {
importer.isReadable = true;
EditorUtility.SetDirty(importer);
AssetDatabase.ImportAsset(path);
}
}
}
}
target.scalingMode = (RuleTexture.ScalingMode)EditorGUILayout.EnumPopup("Scaling Mode", target.scalingMode);
if (target.scalingMode == RuleTexture.ScalingMode.FixedScale) {
EditorGUI.indentLevel++;
target.nodesPerPixel = EditorGUILayout.FloatField("Nodes Per Pixel", target.nodesPerPixel);
EditorGUI.indentLevel--;
}
for (int i = 0; i < 4; i++) {
char channelName = "RGBA"[i];
target.channels[i] = (RuleTexture.ChannelUse)EditorGUILayout.Popup("" + channelName, (int)target.channels[i], ChannelUseNames);
if (target.channels[i] != RuleTexture.ChannelUse.None) {
EditorGUI.indentLevel++;
if (target.channels[i] != RuleTexture.ChannelUse.Walkable) {
target.channelScales[i] = EditorGUILayout.FloatField("Scale", target.channelScales[i]);
}
string help = "";
switch (target.channels[i]) {
case RuleTexture.ChannelUse.Penalty:
help = "Penalty goes from 0 to " + target.channelScales[i].ToString("0") + " depending on the " + channelName + " channel value";
break;
case RuleTexture.ChannelUse.Position:
help = "Nodes will have their Y coordinate set to a value between 0 and " + target.channelScales[i].ToString("0") + " depending on the "+channelName+" channel";
if (graph.collision.heightCheck) {
EditorGUILayout.HelpBox("Height testing is enabled but the node positions will be overwritten by the texture data. You should disable either height testing or this feature.", MessageType.Error);
}
break;
case RuleTexture.ChannelUse.WalkablePenalty:
help = "If the "+channelName+" channel is 0, the node is made unwalkable. Otherwise the penalty goes from 0 to " + target.channelScales[i].ToString("0") + " depending on the " + channelName + " channel value";
break;
case RuleTexture.ChannelUse.Walkable:
help = "If the "+channelName+" channel is 0, the node is made unwalkable.";
break;
}
EditorGUILayout.HelpBox(help, MessageType.None);
if ((target.channels[i] == RuleTexture.ChannelUse.Penalty || target.channels[i] == RuleTexture.ChannelUse.WalkablePenalty) && target.channelScales[i] < 0) {
EditorGUILayout.HelpBox("Negative penalties are not supported. You can instead raise the penalty of other nodes.", MessageType.Error);
}
EditorGUI.indentLevel--;
}
}
}
static void SaveReferenceTexture (GridGraph graph) {
if (graph.nodes == null || graph.nodes.Length != graph.width * graph.depth * graph.LayerCount) {
AstarPath.active.Scan();
}
if (graph.nodes.Length < graph.width * graph.depth) {
Debug.LogError("Couldn't create reference image since nodes.Length < width*depth");
return;
}
if (graph.nodes.Length == 0) {
Debug.LogError("Couldn't create reference image since the graph is too small (0*0)");
return;
}
if (graph.LayerCount > 1) {
Debug.LogWarning("Creating reference image for a layered grid graph. Only the first layer will be included in the image.");
}
var tex = new Texture2D(graph.width, graph.depth);
float maxY = float.NegativeInfinity;
for (int i = 0; i < graph.nodes.Length; i++) {
Vector3 p = graph.nodes[i] != null? graph.transform.InverseTransform((Vector3)graph.nodes[i].position) : Vector3.zero;
maxY = p.y > maxY ? p.y : maxY;
}
var cols = new Color[graph.width*graph.depth];
for (int z = 0; z < graph.depth; z++) {
for (int x = 0; x < graph.width; x++) {
GraphNode node = graph.nodes[z*graph.width+x];
if (node != null) {
float v = node.Walkable ? 1F : 0.0F;
Vector3 p = graph.transform.InverseTransform((Vector3)node.position);
float q = p.y / maxY;
cols[z*graph.width+x] = new Color(v, q, 0);
} else {
cols[z*graph.width+x] = new Color(0, 0, 0);
}
}
}
tex.SetPixels(cols);
tex.Apply();
string path = AssetDatabase.GenerateUniqueAssetPath("Assets/gridReference.png");
System.IO.File.WriteAllBytes(path, tex.EncodeToPNG());
AssetDatabase.Refresh();
Object obj = AssetDatabase.LoadAssetAtPath(path, typeof(Texture));
EditorGUIUtility.PingObject(obj);
}
public void OnSceneGUI (GridGraph graph, GridGraphRule rule) { }
}
}
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