Merge pull request #1206 from ScyDev/feature/polygonpathfinder_demo

- how to use PolygonPathFinder from GD Script

demos/2d/polygon_path_finder_demo/.fscache

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+::res://::1421147952
+icon.png::ImageTexture::1420046079::
+new_scene_poly_with_holes.scn::PackedScene::1421147952::
+polygonpathfinder.gd::GDScript::1421146502::

demos/2d/polygon_path_finder_demo/engine.cfg

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+[application]
+
+name="polygon_path_finder_demo"
+main_scene="res://new_scene_poly_with_holes.scn"
+icon="icon.png"

demos/2d/polygon_path_finder_demo/icon.png.flags

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+gen_mipmaps=true

demos/2d/polygon_path_finder_demo/polygonpathfinder.gd

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+
+extends Spatial
+
+func _ready():
+	var pf = PolygonPathFinder.new()
+	
+	var points = Vector2Array()
+	var connections = IntArray()
+	
+	# poly 1
+	points.push_back(Vector2(0, 0))		#0
+	points.push_back(Vector2(10, 0))	#1
+	points.push_back(Vector2(10, 10))	#2
+	points.push_back(Vector2(0, 10))	#3
+
+	connections.push_back(0) # connect vertex 0 ...
+	connections.push_back(1) # ... to 1
+	drawLine(points[0], points[1], get_node("/root/Spatial/Polys"))
+	connections.push_back(1) # connect vertex 1 ...
+	connections.push_back(2) # ... to 2
+	drawLine(points[1], points[2], get_node("/root/Spatial/Polys"))
+	connections.push_back(2) # etc.
+	connections.push_back(3)
+	drawLine(points[2], points[3], get_node("/root/Spatial/Polys"))
+	connections.push_back(3) # connect vertex 3 ...
+	connections.push_back(0) # back to vertex 0, to close the polygon
+	drawLine(points[3], points[0], get_node("/root/Spatial/Polys"))
+
+	# poly 2, as obstacle inside poly 1
+	points.push_back(Vector2(2, 0.5))	#4
+	points.push_back(Vector2(4, 0.5))	#5
+	points.push_back(Vector2(4, 9.5))	#6
+	points.push_back(Vector2(2, 9.5))	#7
+
+	connections.push_back(4)
+	connections.push_back(5)
+	drawLine(points[4], points[5], get_node("/root/Spatial/Polys"))
+	connections.push_back(5)
+	connections.push_back(6)
+	drawLine(points[5], points[6], get_node("/root/Spatial/Polys"))
+	connections.push_back(6)
+	connections.push_back(7)
+	drawLine(points[6], points[7], get_node("/root/Spatial/Polys"))
+	connections.push_back(7)
+	connections.push_back(4)
+	drawLine(points[7], points[4], get_node("/root/Spatial/Polys"))
+
+	
+	print("points: ",points)
+	print("connections: ",connections)
+	
+	pf.setup(points, connections)
+	
+	var path = pf.find_path(Vector2(1, 5), Vector2(8, 5))
+	
+	var lastStep = null
+	print("path: ",path)
+	for step in path:
+		print("step: ",step)
+		if (lastStep != null):
+			var currPathSegment = Vector2Array()
+			drawLine(lastStep, step, get_node("/root/Spatial/Path"))
+		lastStep = step
+		
+
+
+func drawLine(pointA, pointB, immediateGeo):
+	var drawPosY = 0.1
+	var im = immediateGeo
+	
+	im.begin(Mesh.PRIMITIVE_POINTS, null)
+	im.add_vertex(Vector3(pointA.x, drawPosY, pointA.y))
+	im.add_vertex(Vector3(pointB.x, drawPosY, pointB.y))
+	im.end()
+	im.begin(Mesh.PRIMITIVE_LINE_STRIP, null)
+	im.add_vertex(Vector3(pointA.x, drawPosY, pointA.y))
+	im.add_vertex(Vector3(pointB.x, drawPosY, pointB.y))
+	im.end()
+	
+