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from pyqtgraph.Qt import QtGui, QtCore
from pyqtgraph.Point import Point
from .GraphicsObject import GraphicsObject
import pyqtgraph.functions as fn
import numpy as np
import weakref
__all__ = ['InfiniteLine']
class InfiniteLine(GraphicsObject):
"""
**Bases:** :class:`GraphicsObject <pyqtgraph.GraphicsObject>`
Displays a line of infinite length.
This line may be dragged to indicate a position in data coordinates.
=============================== ===================================================
**Signals**
sigDragged(self)
sigPositionChangeFinished(self)
sigPositionChanged(self)
=============================== ===================================================
"""
sigDragged = QtCore.Signal(object)
sigPositionChangeFinished = QtCore.Signal(object)
sigPositionChanged = QtCore.Signal(object)
def __init__(self, pos=None, angle=90, pen=None, movable=False, bounds=None):
"""
============= ==================================================================
**Arguments**
pos Position of the line. This can be a QPointF or a single value for
vertical/horizontal lines.
angle Angle of line in degrees. 0 is horizontal, 90 is vertical.
pen Pen to use when drawing line. Can be any arguments that are valid
for :func:`mkPen <pyqtgraph.mkPen>`. Default pen is transparent
yellow.
movable If True, the line can be dragged to a new position by the user.
bounds Optional [min, max] bounding values. Bounds are only valid if the
line is vertical or horizontal.
============= ==================================================================
"""
GraphicsObject.__init__(self)
if bounds is None: ## allowed value boundaries for orthogonal lines
self.maxRange = [None, None]
else:
self.maxRange = bounds
self.moving = False
self.setMovable(movable)
self.mouseHovering = False
self.p = [0, 0]
self.setAngle(angle)
if pos is None:
pos = Point(0,0)
self.setPos(pos)
if pen is None:
pen = (200, 200, 100)
self.setPen(pen)
self.currentPen = self.pen
#self.setFlag(self.ItemSendsScenePositionChanges)
def setMovable(self, m):
"""Set whether the line is movable by the user."""
self.movable = m
self.setAcceptHoverEvents(m)
def setBounds(self, bounds):
"""Set the (minimum, maximum) allowable values when dragging."""
self.maxRange = bounds
self.setValue(self.value())
def setPen(self, pen):
"""Set the pen for drawing the line. Allowable arguments are any that are valid
for :func:`mkPen <pyqtgraph.mkPen>`."""
self.pen = fn.mkPen(pen)
self.currentPen = self.pen
self.update()
def setAngle(self, angle):
"""
Takes angle argument in degrees.
0 is horizontal; 90 is vertical.
Note that the use of value() and setValue() changes if the line is
not vertical or horizontal.
"""
self.angle = ((angle+45) % 180) - 45 ## -45 <= angle < 135
self.resetTransform()
self.rotate(self.angle)
self.update()
def setPos(self, pos):
if type(pos) in [list, tuple]:
newPos = pos
elif isinstance(pos, QtCore.QPointF):
newPos = [pos.x(), pos.y()]
else:
if self.angle == 90:
newPos = [pos, 0]
elif self.angle == 0:
newPos = [0, pos]
else:
raise Exception("Must specify 2D coordinate for non-orthogonal lines.")
## check bounds (only works for orthogonal lines)
if self.angle == 90:
if self.maxRange[0] is not None:
newPos[0] = max(newPos[0], self.maxRange[0])
if self.maxRange[1] is not None:
newPos[0] = min(newPos[0], self.maxRange[1])
elif self.angle == 0:
if self.maxRange[0] is not None:
newPos[1] = max(newPos[1], self.maxRange[0])
if self.maxRange[1] is not None:
newPos[1] = min(newPos[1], self.maxRange[1])
if self.p != newPos:
self.p = newPos
GraphicsObject.setPos(self, Point(self.p))
self.update()
self.sigPositionChanged.emit(self)
def getXPos(self):
return self.p[0]
def getYPos(self):
return self.p[1]
def getPos(self):
return self.p
def value(self):
"""Return the value of the line. Will be a single number for horizontal and
vertical lines, and a list of [x,y] values for diagonal lines."""
if self.angle%180 == 0:
return self.getYPos()
elif self.angle%180 == 90:
return self.getXPos()
else:
return self.getPos()
def setValue(self, v):
"""Set the position of the line. If line is horizontal or vertical, v can be
a single value. Otherwise, a 2D coordinate must be specified (list, tuple and
QPointF are all acceptable)."""
self.setPos(v)
## broken in 4.7
#def itemChange(self, change, val):
#if change in [self.ItemScenePositionHasChanged, self.ItemSceneHasChanged]:
#self.updateLine()
#print "update", change
#print self.getBoundingParents()
#else:
#print "ignore", change
#return GraphicsObject.itemChange(self, change, val)
def boundingRect(self):
#br = UIGraphicsItem.boundingRect(self)
br = self.viewRect()
## add a 4-pixel radius around the line for mouse interaction.
px = self.pixelLength(direction=Point(1,0), ortho=True) ## get pixel length orthogonal to the line
if px is None:
px = 0
br.setBottom(-px*4)
br.setTop(px*4)
return br.normalized()
def paint(self, p, *args):
br = self.boundingRect()
p.setPen(self.currentPen)
p.drawLine(Point(br.right(), 0), Point(br.left(), 0))
#p.drawRect(self.boundingRect())
def dataBounds(self, axis, frac=1.0, orthoRange=None):
if axis == 0:
return None ## x axis should never be auto-scaled
else:
return (0,0)
#def mousePressEvent(self, ev):
#if self.movable and ev.button() == QtCore.Qt.LeftButton:
#ev.accept()
#self.pressDelta = self.mapToParent(ev.pos()) - QtCore.QPointF(*self.p)
#else:
#ev.ignore()
#def mouseMoveEvent(self, ev):
#self.setPos(self.mapToParent(ev.pos()) - self.pressDelta)
##self.emit(QtCore.SIGNAL('dragged'), self)
#self.sigDragged.emit(self)
#self.hasMoved = True
#def mouseReleaseEvent(self, ev):
#if self.hasMoved and ev.button() == QtCore.Qt.LeftButton:
#self.hasMoved = False
##self.emit(QtCore.SIGNAL('positionChangeFinished'), self)
#self.sigPositionChangeFinished.emit(self)
def mouseDragEvent(self, ev):
if self.movable and ev.button() == QtCore.Qt.LeftButton:
if ev.isStart():
self.moving = True
self.cursorOffset = self.pos() - self.mapToParent(ev.buttonDownPos())
self.startPosition = self.pos()
ev.accept()
if not self.moving:
return
#pressDelta = self.mapToParent(ev.buttonDownPos()) - Point(self.p)
self.setPos(self.cursorOffset + self.mapToParent(ev.pos()))
self.sigDragged.emit(self)
if ev.isFinish():
self.moving = False
self.sigPositionChangeFinished.emit(self)
#else:
#print ev
def mouseClickEvent(self, ev):
if self.moving and ev.button() == QtCore.Qt.RightButton:
ev.accept()
self.setPos(self.startPosition)
self.moving = False
self.sigDragged.emit(self)
self.sigPositionChangeFinished.emit(self)
def hoverEvent(self, ev):
if (not ev.isExit()) and self.movable and ev.acceptDrags(QtCore.Qt.LeftButton):
self.setMouseHover(True)
else:
self.setMouseHover(False)
def setMouseHover(self, hover):
## Inform the item that the mouse is(not) hovering over it
if self.mouseHovering == hover:
return
self.mouseHovering = hover
if hover:
self.currentPen = fn.mkPen(255, 0,0)
else:
self.currentPen = self.pen
self.update()
#def hoverEnterEvent(self, ev):
#print "line hover enter"
#ev.ignore()
#self.updateHoverPen()
#def hoverMoveEvent(self, ev):
#print "line hover move"
#ev.ignore()
#self.updateHoverPen()
#def hoverLeaveEvent(self, ev):
#print "line hover leave"
#ev.ignore()
#self.updateHoverPen(False)
#def updateHoverPen(self, hover=None):
#if hover is None:
#scene = self.scene()
#hover = scene.claimEvent(self, QtCore.Qt.LeftButton, scene.Drag)
#if hover:
#self.currentPen = fn.mkPen(255, 0,0)
#else:
#self.currentPen = self.pen
#self.update()
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