path: root/src/editorui.py

from common import *
from math import floor, ceil
import weakref


class KPEditorItem(QtGui.QGraphicsItem):
	def __init__(self):
		QtGui.QGraphicsItem.__init__(self)
		self.setFlags(
				self.ItemSendsGeometryChanges |
				self.ItemIsSelectable |
				self.ItemIsMovable
				)
	
	def itemChange(self, change, value):
		if change == self.ItemPositionChange:
			currentX, currentY = self.x(), self.y()

			# snap the item to 24x24
			newpos = value.toPyObject()

			x, y = newpos.x(), newpos.y()

			x = int((x + 12) / 24) * 24
			y = int((y + 12) / 24) * 24

			if x < 0: x = 0
			if x > 12264: x = 12264
			if y < 0: y = 0
			if y > 12264: y = 12264

			if x != currentX or y != currentY:
				self._itemMoved(currentX, currentY, x, y)

			newpos.setX(x)
			newpos.setY(y)
			return newpos

		return QtGui.QGraphicsItem.itemChange(self, change, value)

	def boundingRect(self):
		return self._boundingRect

	def _itemMoved(self, oldX, oldY, newX, newY):
		pass


class KPEditorObject(KPEditorItem):
	def __init__(self, obj, layer):
		KPEditorItem.__init__(self)
		obj.qtItem = self
		self._objRef = weakref.ref(obj)
		self._layerRef = weakref.ref(layer)
		self._updatePosition()
		self._updateSize()

		self.setAcceptHoverEvents(True)

		self.resizing = None

		# I don't bother setting the ZValue because it doesn't quite matter:
		# only one layer's objects are ever clickable, and drawBackground takes
		# care of the layered drawing
	
	def _updatePosition(self):
		obj = self._objRef()
		x,y = obj.position

		self.setPos(x*24, y*24)
	
	def _updateSize(self):
		self.prepareGeometryChange()

		obj = self._objRef()
		w,h = obj.size

		self._boundingRect = QtCore.QRectF(0, 0, w*24, h*24)
		self._selectionRect = QtCore.QRectF(0, 0, w*24-1, h*24-1)

		self._resizerEndXY = (w*24-5, h*24-5)
	

	def paint(self, painter, option, widget):
		if self.isSelected():
			painter.setPen(QtGui.QPen(Qt.white, 1, Qt.DotLine))
			painter.drawRect(self._selectionRect)
	

	RESIZER_TOP_LEFT = 1
	RESIZER_TOP_RIGHT = 2
	RESIZER_BOTTOM_LEFT = 3
	RESIZER_BOTTOM_RIGHT = 4
	RESIZER_TOP = 5
	RESIZER_BOTTOM = 6
	RESIZER_LEFT = 7
	RESIZER_RIGHT = 8

	def resizerPortionAt(self, x, y):
		rightBound, bottomBound = self._resizerEndXY

		if y < 5:
			if x < 5:				return 1 # TOP_LEFT
			elif x >= rightBound:	return 2 # TOP_RIGHT
			else:					return 5 # TOP

		elif y >= bottomBound:
			if x < 5:				return 3 # BOTTOM_LEFT
			elif x >= rightBound:	return 4 # BOTTOM_RIGHT
			else:					return 6 # BOTTOM

		else:
			if x < 5:				return 7 # LEFT
			elif x >= rightBound:	return 8 # RIGHT
			else:					return None
	

	def hoverMoveEvent(self, event):
		if self._layerRef() != KP.mapScene.currentLayer:
			self.setCursor(Qt.ArrowCursor)
			return

		pos = event.pos()
		bit = self.resizerPortionAt(pos.x(), pos.y())

		if bit == 1 or bit == 4:
			self.setCursor(Qt.SizeFDiagCursor)
		elif bit == 2 or bit == 3:
			self.setCursor(Qt.SizeBDiagCursor)
		elif bit == 7 or bit == 8:
			self.setCursor(Qt.SizeHorCursor)
		elif bit == 5 or bit == 6:
			self.setCursor(Qt.SizeVerCursor)
		else:
			self.setCursor(Qt.ArrowCursor)
	

	def mousePressEvent(self, event):
		if event.button() == Qt.LeftButton:
			pos = event.pos()
			bit = self.resizerPortionAt(pos.x(), pos.y())

			if self._layerRef() == KP.mapScene.currentLayer and bit:
				event.accept()

				x, xSide, y, ySide = False, None, False, None
				
				if bit == 1 or bit == 7 or bit == 3:
					x, xSide = True, 1
				elif bit == 2 or bit == 4 or bit == 8:
					x, xSide = True, 0

				if bit == 1 or bit == 2 or bit == 5:
					y, ySide = True, 1
				elif bit == 3 or bit == 4 or bit == 6:
					y, ySide = True, 0

				self.resizing = (x, xSide, y, ySide)
				return

		KPEditorItem.mousePressEvent(self, event)
	

	def _tryAndResize(self, obj, axisIndex, mousePosition, stationarySide):
		objPosition = obj.position[axisIndex]
		objSize = obj.size[axisIndex]


		if stationarySide == 0:
			# Resize the right/bottom side
			relativeMousePosition = mousePosition - objPosition
			newSize = relativeMousePosition + 1
			if newSize == objSize or newSize < 1:
				return False

			if axisIndex == 1:
				obj.size = (obj.size[0], newSize)
			else:
				obj.size = (newSize, obj.size[1])

		else:
			# Resize the left/top side
			rightSide = objPosition + objSize - 1
			newLeftSide = mousePosition

			newPosition = newLeftSide
			newSize = rightSide - newLeftSide + 1

			if newSize < 1:
				return False
			if newPosition == objPosition and newSize == objSize:
				return False

			if axisIndex == 1:
				obj.position = (obj.position[0], newPosition)
				obj.size = (obj.size[0], newSize)
			else:
				obj.position = (newPosition, obj.position[1])
				obj.size = (newSize, obj.size[1])

		return True


	def mouseMoveEvent(self, event):
		if self.resizing:
			obj = self._objRef()
			scenePos = event.scenePos()

			hasChanged = False
			resizeX, xSide, resizeY, ySide = self.resizing

			if resizeX:
				hasChanged |= self._tryAndResize(obj, 0, int(scenePos.x() / 24), xSide)
			if resizeY:
				hasChanged |= self._tryAndResize(obj, 1, int(scenePos.y() / 24), ySide)

			if hasChanged:
				obj.updateCache()
				self._layerRef().updateCache()
				self._updatePosition()
				self._updateSize()

		else:
			KPEditorItem.mouseMoveEvent(self, event)
	

	def mouseReleaseEvent(self, event):
		if self.resizing and event.button() == Qt.LeftButton:
			self.resizing = None
		else:
			KPEditorItem.mouseReleaseEvent(self, event)
	

	def _itemMoved(self, oldX, oldY, newX, newY):
		obj = self._objRef()
		obj.position = (newX/24, newY/24)
		self._layerRef().updateCache()


class KPMapScene(QtGui.QGraphicsScene):
	def __init__(self):
		QtGui.QGraphicsScene.__init__(self, 0, 0, 512*24, 512*24)
		
		# todo: handle selectionChanged
		# todo: look up why I used setItemIndexMethod(self.NoIndex) in Reggie

		self.currentLayer = None
		KP.mapScene = self
	

	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 = floor(areaLeft / 24)
		areaTopT = floor(areaTop / 24)
		areaRightT = ceil(areaRight / 24)
		areaBottomT = ceil(areaBottom / 24)

		for layer in reversed(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 = int(max(areaLeftT, left))
			drawRight = int(min(areaRightT, right))

			drawTop = int(max(areaTopT, top))
			drawBottom = int(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.setLayerObjectsFlag(self.currentLayer, QtGui.QGraphicsItem.ItemIsMovable, False)

		self.currentLayer = layer
		self.setLayerObjectsFlag(layer, QtGui.QGraphicsItem.ItemIsSelectable, True)
		self.setLayerObjectsFlag(layer, QtGui.QGraphicsItem.ItemIsMovable, 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):
	def __init__(self, scene, parent=None):
		QtGui.QGraphicsView.__init__(self, scene, parent)

		self.setAlignment(Qt.AlignLeft | Qt.AlignTop)
		self.setDragMode(self.RubberBandDrag)
		
		self.xScrollBar = QtGui.QScrollBar(Qt.Horizontal, parent)
		self.setHorizontalScrollBar(self.xScrollBar)
		
		self.yScrollBar = QtGui.QScrollBar(Qt.Vertical, parent)
		self.setVerticalScrollBar(self.yScrollBar)

		self.centerOn(0,0)

		# set up stuff for painting
		self.paintNext = None
		self.paintNextID = None
		self._resetPaintVars()
	
	def _resetPaintVars(self):
		self.painting = None
		self.paintingItem = None
		self.paintBeginPosition = None
	
	def _tryToPaint(self, event):
		'''Called when a paint attempt is initiated'''

		if self.paintNext is None: return

		paint = self.paintNext
		if isinstance(paint, KPTileObject):
			clicked = self.mapToScene(event.x(), event.y())
			x, y = clicked.x(), clicked.y()
			if x < 0: x = 0
			if y < 0: y = 0

			x = int(x / 24)
			y = int(y / 24)

			layer = self.scene().currentLayer

			obj = KPObject()
			obj.position = (x,y)
			obj.size = (1,1)
			obj.tileset = layer.tileset
			obj.kind = paint
			obj.updateCache()
			layer.objects.append(obj)
			layer.updateCache()

			item = KPEditorObject(obj, layer)
			self.scene().addItem(item)

			self.painting = obj
			self.paintingItem = item
			self.paintBeginPosition = (x, y)
	
	def _movedWhilePainting(self, event):
		'''Called when the mouse is moved while painting something'''

		obj = self.painting
		item = self.paintingItem

		if isinstance(obj, KPObject):
			clicked = self.mapToScene(event.x(), event.y())
			x, y = clicked.x(), clicked.y()
			if x < 0: x = 0
			if y < 0: y = 0

			x = int(x / 24)
			y = int(y / 24)

			beginX, beginY = self.paintBeginPosition

			if x >= beginX:
				objX = beginX
				width = x - beginX + 1
			else:
				objX = x
				width = beginX - x + 1

			if y >= beginY:
				objY = beginY
				height = y - beginY + 1
			else:
				objY = y
				height = beginY - y + 1

			currentX, currentY = obj.position
			currentWidth, currentHeight = obj.size

			# update everything if changed
			changed = False

			if currentX != objX or currentY != objY:
				obj.position = (objX, objY)
				item._updatePosition()
				changed = True
			
			if currentWidth != width or currentHeight != height:
				obj.size = (width, height)
				obj.updateCache()
				item._updateSize()
				changed = True

			if not changed: return

			item._layerRef().updateCache()
	
	def mousePressEvent(self, event):
		if event.button() == Qt.RightButton:
			self._tryToPaint(event)
			event.accept()

		else:
			QtGui.QGraphicsView.mousePressEvent(self, event)
	
	def mouseMoveEvent(self, event):
		if event.buttons() == Qt.RightButton and self.painting:
			self._movedWhilePainting(event)
			event.accept()

		else:
			QtGui.QGraphicsView.mouseMoveEvent(self, event)