Mercurial Repositories > eric / file comparison
comparison: eric6/E5Graphics/E5ArrowItem.py
eric6/E5Graphics/E5ArrowItem.py
- changeset 6942
- 2602857055c5
- parent 6645
- ad476851d7e0
- child 7229
- 53054eb5b15a
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| 6941:f99d60d6b59b | 6942:2602857055c5 |
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| 1 # -*- coding: utf-8 -*- | |
| 2 | |
| 3 # Copyright (c) 2007 - 2019 Detlev Offenbach <detlev@die-offenbachs.de> | |
| 4 # | |
| 5 | |
| 6 """ | |
| 7 Module implementing a graphics item subclass for an arrow. | |
| 8 """ | |
| 9 | |
| 10 from __future__ import unicode_literals | |
| 11 | |
| 12 import math | |
| 13 | |
| 14 from PyQt5.QtCore import QPointF, QRectF, QSizeF, QLineF, Qt | |
| 15 from PyQt5.QtGui import QPen, QPolygonF | |
| 16 from PyQt5.QtWidgets import QAbstractGraphicsShapeItem, QGraphicsItem, QStyle | |
| 17 | |
| 18 NormalArrow = 1 | |
| 19 WideArrow = 2 | |
| 20 | |
| 21 ArrowheadAngleFactor = 0.26179938779914941 | |
| 22 # 0.5 * math.atan(math.sqrt(3.0) / 3.0) | |
| 23 | |
| 24 | |
| 25 class E5ArrowItem(QAbstractGraphicsShapeItem): | |
| 26 """ | |
| 27 Class implementing an arrow graphics item subclass. | |
| 28 """ | |
| 29 def __init__(self, origin=None, end=None, | |
| 30 filled=False, arrowType=NormalArrow, parent=None): | |
| 31 """ | |
| 32 Constructor | |
| 33 | |
| 34 @param origin origin of the arrow (QPointF) | |
| 35 @param end end point of the arrow (QPointF) | |
| 36 @param filled flag indicating a filled arrow head (boolean) | |
| 37 @param arrowType arrow type (NormalArrow, WideArrow) | |
| 38 @keyparam parent reference to the parent object (QGraphicsItem) | |
| 39 """ | |
| 40 super(E5ArrowItem, self).__init__(parent) | |
| 41 | |
| 42 self._origin = QPointF() if origin is None else QPointF(origin) | |
| 43 self._end = QPointF() if end is None else QPointF(end) | |
| 44 self._filled = filled | |
| 45 self._type = arrowType | |
| 46 | |
| 47 self._halfLength = 13.0 | |
| 48 | |
| 49 self.setFlag(QGraphicsItem.ItemIsMovable, True) | |
| 50 self.setFlag(QGraphicsItem.ItemIsSelectable, True) | |
| 51 | |
| 52 def setPoints(self, xa, ya, xb, yb): | |
| 53 """ | |
| 54 Public method to set the start and end points of the line. | |
| 55 | |
| 56 <b>Note:</b> This method does not redraw the item. | |
| 57 | |
| 58 @param xa x-coordinate of the start point (float) | |
| 59 @param ya y-coordinate of the start point (float) | |
| 60 @param xb x-coordinate of the end point (float) | |
| 61 @param yb y-coordinate of the end point (float) | |
| 62 """ | |
| 63 self._origin = QPointF(xa, ya) | |
| 64 self._end = QPointF(xb, yb) | |
| 65 | |
| 66 def setStartPoint(self, x, y): | |
| 67 """ | |
| 68 Public method to set the start point. | |
| 69 | |
| 70 <b>Note:</b> This method does not redraw the item. | |
| 71 | |
| 72 @param x x-coordinate of the start point (float) | |
| 73 @param y y-coordinate of the start point (float) | |
| 74 """ | |
| 75 self._origin = QPointF(x, y) | |
| 76 | |
| 77 def setEndPoint(self, x, y): | |
| 78 """ | |
| 79 Public method to set the end point. | |
| 80 | |
| 81 <b>Note:</b> This method does not redraw the item. | |
| 82 | |
| 83 @param x x-coordinate of the end point (float) | |
| 84 @param y y-coordinate of the end point (float) | |
| 85 """ | |
| 86 self._end = QPointF(x, y) | |
| 87 | |
| 88 def boundingRect(self): | |
| 89 """ | |
| 90 Public method to return the bounding rectangle. | |
| 91 | |
| 92 @return bounding rectangle (QRectF) | |
| 93 """ | |
| 94 extra = self._halfLength / 2.0 | |
| 95 return QRectF(self._origin, QSizeF(self._end.x() - self._origin.x(), | |
| 96 self._end.y() - self._origin.y()))\ | |
| 97 .normalized()\ | |
| 98 .adjusted(-extra, -extra, extra, extra) | |
| 99 | |
| 100 def paint(self, painter, option, widget=None): | |
| 101 """ | |
| 102 Public method to paint the item in local coordinates. | |
| 103 | |
| 104 @param painter reference to the painter object (QPainter) | |
| 105 @param option style options (QStyleOptionGraphicsItem) | |
| 106 @param widget optional reference to the widget painted on (QWidget) | |
| 107 """ | |
| 108 if (option.state & QStyle.State_Selected) == \ | |
| 109 QStyle.State(QStyle.State_Selected): | |
| 110 width = 2 | |
| 111 else: | |
| 112 width = 1 | |
| 113 | |
| 114 # draw the line first | |
| 115 line = QLineF(self._origin, self._end) | |
| 116 painter.setPen( | |
| 117 QPen(Qt.black, width, Qt.SolidLine, Qt.FlatCap, Qt.MiterJoin)) | |
| 118 painter.drawLine(line) | |
| 119 | |
| 120 # draw the arrow head | |
| 121 arrowAngle = self._type * ArrowheadAngleFactor | |
| 122 slope = math.atan2(line.dy(), line.dx()) | |
| 123 | |
| 124 # Calculate left arrow point | |
| 125 arrowSlope = slope + arrowAngle | |
| 126 a1 = QPointF(self._end.x() - self._halfLength * math.cos(arrowSlope), | |
| 127 self._end.y() - self._halfLength * math.sin(arrowSlope)) | |
| 128 | |
| 129 # Calculate right arrow point | |
| 130 arrowSlope = slope - arrowAngle | |
| 131 a2 = QPointF(self._end.x() - self._halfLength * math.cos(arrowSlope), | |
| 132 self._end.y() - self._halfLength * math.sin(arrowSlope)) | |
| 133 | |
| 134 if self._filled: | |
| 135 painter.setBrush(Qt.black) | |
| 136 else: | |
| 137 painter.setBrush(Qt.white) | |
| 138 polygon = QPolygonF() | |
| 139 polygon.append(line.p2()) | |
| 140 polygon.append(a1) | |
| 141 polygon.append(a2) | |
| 142 painter.drawPolygon(polygon) |
