--- a/E4Graphics/E4ArrowItem.py Tue Jan 12 17:55:24 2010 +0000
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,135 +0,0 @@
-# -*- coding: utf-8 -*-
-
-# Copyright (c) 2007 - 2010 Detlev Offenbach <detlev@die-offenbachs.de>
-#
-
-"""
-Module implementing a graphics item subclass for an arrow.
-"""
-
-from math import *
-
-from PyQt4.QtCore import *
-from PyQt4.QtGui import *
-
-NormalArrow = 1
-WideArrow = 2
-
-ArrowheadAngleFactor = 0.26179938779914941 # 0.5 * atan(sqrt(3.0) / 3.0)
-
-class E4ArrowItem(QAbstractGraphicsShapeItem):
- """
- Class implementing an arrow graphics item subclass.
- """
- def __init__(self, origin = QPointF(), end = QPointF(),
- filled = False, type = NormalArrow, parent = None):
- """
- Constructor
-
- @param origin origin of the arrow (QPointF)
- @param end end point of the arrow (QPointF)
- @param filled flag indicating a filled arrow head (boolean)
- @param type arrow type (NormalArrow, WideArrow)
- @keyparam parent reference to the parent object (QGraphicsItem)
- """
- QAbstractGraphicsShapeItem.__init__(self, parent)
-
- self._origin = origin
- self._end = end
- self._filled = filled
- self._type = type
-
- self._halfLength = 13.0
-
- self.setFlag(QGraphicsItem.ItemIsMovable, True)
- self.setFlag(QGraphicsItem.ItemIsSelectable, True)
-
- def setPoints(self, xa, ya, xb, yb):
- """
- Public method to set the start and end points of the line.
-
- <b>Note:</b> This method does not redraw the item.
-
- @param xa x-coordinate of the start point (float)
- @param ya y-coordinate of the start point (float)
- @param xb x-coordinate of the end point (float)
- @param yb y-coordinate of the end point (float)
- """
- self._origin = QPointF(xa, ya)
- self._end = QPointF(xb, yb)
-
- def setStartPoint(self, x, y):
- """
- Public method to set the start point.
-
- <b>Note:</b> This method does not redraw the item.
-
- @param x x-coordinate of the start point (float)
- @param y y-coordinate of the start point (float)
- """
- self._origin = QPointF(x, y)
-
- def setEndPoint(self, x, y):
- """
- Public method to set the end point.
-
- <b>Note:</b> This method does not redraw the item.
-
- @param x x-coordinate of the end point (float)
- @param y y-coordinate of the end point (float)
- """
- self._end = QPointF(x, y)
-
- def boundingRect(self):
- """
- Public method to return the bounding rectangle.
-
- @return bounding rectangle (QRectF)
- """
- extra = self._halfLength / 2.0
- return QRectF(self._origin, QSizeF(self._end.x() - self._origin.x(),
- self._end.y() - self._origin.y()))\
- .normalized()\
- .adjusted(-extra, -extra, extra, extra)
-
- def paint(self, painter, option, widget = None):
- """
- Public method to paint the item in local coordinates.
-
- @param painter reference to the painter object (QPainter)
- @param option style options (QStyleOptionGraphicsItem)
- @param widget optional reference to the widget painted on (QWidget)
- """
- if (option.state & QStyle.State_Selected) == QStyle.State(QStyle.State_Selected):
- width = 2
- else:
- width = 1
-
- # draw the line first
- line = QLineF(self._origin, self._end)
- painter.setPen(QPen(Qt.black, width, Qt.SolidLine, Qt.FlatCap, Qt.MiterJoin))
- painter.drawLine(line)
-
- # draw the arrow head
- arrowAngle = self._type * ArrowheadAngleFactor
- slope = atan2(line.dy(), line.dx())
-
- # Calculate left arrow point
- arrowSlope = slope + arrowAngle
- a1 = QPointF(self._end.x() - self._halfLength * cos(arrowSlope),
- self._end.y() - self._halfLength * sin(arrowSlope))
-
- # Calculate right arrow point
- arrowSlope = slope - arrowAngle
- a2 = QPointF(self._end.x() - self._halfLength * cos(arrowSlope),
- self._end.y() - self._halfLength * sin(arrowSlope))
-
- if self._filled:
- painter.setBrush(Qt.black)
- else:
- painter.setBrush(Qt.white)
- polygon = QPolygonF()
- polygon.append(line.p2())
- polygon.append(a1)
- polygon.append(a2)
- painter.drawPolygon(polygon)
