from common import *

class KPMapScene(QtGui.QGraphicsScene):
	def __init__(self):
		QtGui.QGraphicsScene.__init__(self)

		self.currentLayer = None
	

	def drawBackground(self, painter, rect):
		painter.fillRect(rect, Qt.white)

		areaLeft, areaTop = rect.x(), rect.y()
		areaWidth, areaHeight = rect.width(), rect.height()
		areaRight, areaBottom = areaLeft+areaWidth, areaTop+areaHeight

		areaLeftT = areaLeft / 24
		areaTopT = areaTop / 24
		areaRightT = areaRight / 24
		areaBottomT = areaBottom / 24

		for layer in KP.map.layers:
			left, top = layer.cacheBasePos
			width, height = layer.cacheSize
			right, bottom = left+width, top+height

			if width == 0 and height == 0: continue

			if right < areaLeftT: continue
			if left > areaRightT: continue

			if bottom < areaTopT: continue
			if top > areaBottomT: continue

			# decide how much of the layer we'll actually draw
			drawLeft = max(areaLeftT, left)
			drawRight = min(areaRightT, right)

			drawTop = max(areaTopT, top)
			drawBottom = min(areaBottomT, bottom)

			srcY = drawTop - top
			destY = drawTop * 24

			baseSrcX = drawLeft - left
			baseDestX = drawLeft * 24

			rows = layer.cache
			tileset = KP.map.loadedTilesets[layer.tileset]
			tileList = tileset.tiles

			for y in xrange(drawTop, drawBottom):
				srcX = baseSrcX
				destX = baseDestX
				row = rows[srcY]

				for x in xrange(drawLeft, drawRight):
					tile = row[srcX]
					if tile != -1:
						painter.drawPixmap(destX, destY, tileList[tile])
					
					srcX += 1
					destX += 24

				srcY += 1
				destY += 24
	

	def setCurrentLayer(self, layer):
		if self.currentLayer is not None:
			self.setLayerObjectsFlag(self.currentLayer, QtGui.QGraphicsItem.ItemIsSelectable, False)

		self.currentLayer = layer
		self.setLayerObjectsFlag(layer, QtGui.QGraphicsItem.ItemIsSelectable, True)
	

	def setLayerObjectsFlag(self, layer, flag, value):
		for obj in layer.objects:
			item = obj.qtItem
			if item:
				item.setFlag(flag, value)

class KPEditorWidget(QtGui.QGraphicsView):
	pass