gistfile1.cs

using UnityEngine;
using System.Collections;
using UnityEditor;

public class LevelEditorWindow : EditorWindow {

	Texture levelData;
	int previewSize = 500;
	int topMargin = 50;
	Color activeColor = Color.white;
	
	// Add menu named "My Window" to the Window menu
	[MenuItem ("JQ Software/Level Editor")]
	static void Init () {
		// Get existing open window or if none, make a new one:
		LevelEditorWindow window = (LevelEditorWindow)EditorWindow.GetWindow (typeof (LevelEditorWindow));
		window.wantsMouseMove = true;
	}

	void ClickedFromPos(Vector2 mousePos) {
		bool isWithinImageBounds = (mousePos.x>0 && mousePos.x<previewSize & mousePos.y>topMargin && mousePos.y<(previewSize+topMargin));
		if(isWithinImageBounds) {
			if(levelData==null) return;

			int width = levelData.width;
			int height = levelData.height;

			float x = Mathf.FloorToInt(((mousePos.x/previewSize)*width));
			float y = height - Mathf.FloorToInt((((mousePos.y - topMargin)/previewSize)*height))-1;
			//Debug.Log(mousePos.y);

			Vector2 pixelClicked = new Vector2( x, y );
			Texture2D pd = (Texture2D)levelData;
			pd.SetPixel((int)pixelClicked.x, (int)pixelClicked.y, activeColor);

			pd.Apply();
			//levelData = (Texture)pd;
			Repaint ();
		}
	}

	void Clear() {
		Texture2D pd = (Texture2D)levelData;
		//pd.SetPixel((int)pixelClicked.x, (int)pixelClicked.y, Color.magenta);
		
		int width = levelData.width;
		int height = levelData.height;

		for(int x=0;x<width;x++) {
			for(int y=0;y<height;y++) {
				pd.SetPixel((int)x, (int)y, Color.white);
			}
		}
		pd.Apply();
		Repaint ();
	}
	
	void OnGUI () {

		levelData = (Texture) EditorGUILayout.ObjectField(levelData, typeof(Texture), false, null);

		if(levelData!=null) {


			EditorGUI.DrawPreviewTexture(new Rect(0,topMargin,500,500), levelData);
		}

		float buttonMargin = 15;
		int x = 0;
		if(GUI.Button(new Rect(x,previewSize + topMargin + buttonMargin,100,100), "Erase")) {
			activeColor = Color.white;
		}
		x+=100;
		if(GUI.Button(new Rect(x,previewSize + topMargin + buttonMargin,100,100), "Floor")) {
			activeColor = Color.cyan;
		}
		x+=100;
		if(GUI.Button(new Rect(x,previewSize + topMargin + buttonMargin,100,100), "Wall")) {
			activeColor = Color.black;
		}
		x+=100;
		if(GUI.Button(new Rect(x,previewSize + topMargin + buttonMargin,100,100), "Enemy Spawner")) {
			activeColor = Color.red;
		}
		x+=100;
		if(GUI.Button(new Rect(x,previewSize + topMargin + buttonMargin,100,100), "Player")) {
			activeColor = Color.green;
		}
		x+=100;
		if(GUI.Button(new Rect(x,previewSize + topMargin + buttonMargin,100,100), "Clear")) {
			Clear();
		}



		Event e = Event.current;
		/*
		if (e.type == EventType.MouseUp) {
			Vector2 mousePos = e.mousePosition;
			ClickedFromPos(mousePos);
		}*/
	//	Debug.Log(e);
		if (e.type == EventType.MouseDrag) {

			//if(e.clickCount>0) {
				ClickedFromPos(e.mousePosition);
			//}
		}
			// Repaint the window as wantsMouseMove doesnt trigger a repaint automatically
		//	if (e.type == EventType.MouseMove)
			//	Repaint ();
		//

	}

}