Mercurial Repositories > eric / file comparison
comparison: eric7/EricGraphics/EricArrowItem.py
eric7/EricGraphics/EricArrowItem.py
- branch
- eric7
- changeset 8348
- f4775ae8f441
- parent 8318
- 962bce857696
- child 8375
- 057f17f82bee
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| 8347:ca9ef7600df7 | 8348:f4775ae8f441 |
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| 1 # -*- coding: utf-8 -*- | |
| 2 | |
| 3 # Copyright (c) 2007 - 2021 Detlev Offenbach <detlev@die-offenbachs.de> | |
| 4 # | |
| 5 | |
| 6 """ | |
| 7 Module implementing a graphics item subclass for an arrow. | |
| 8 """ | |
| 9 # TODO: rename this module to EricArrowItem | |
| 10 | |
| 11 import enum | |
| 12 import math | |
| 13 | |
| 14 from PyQt6.QtCore import QPointF, QRectF, QSizeF, QLineF, Qt | |
| 15 from PyQt6.QtGui import QPen, QPolygonF, QColor | |
| 16 from PyQt6.QtWidgets import QAbstractGraphicsShapeItem, QGraphicsItem, QStyle | |
| 17 | |
| 18 ArrowheadAngleFactor = 0.26179938779914941 | |
| 19 # That is: 0.5 * math.atan(math.sqrt(3.0) / 3.0) | |
| 20 | |
| 21 | |
| 22 class EricArrowType(enum.Enum): | |
| 23 """ | |
| 24 Class defining the arrow types. | |
| 25 """ | |
| 26 NORMAL = 1 | |
| 27 WIDE = 2 | |
| 28 | |
| 29 | |
| 30 class EricArrowItem(QAbstractGraphicsShapeItem): | |
| 31 """ | |
| 32 Class implementing an arrow graphics item subclass. | |
| 33 """ | |
| 34 def __init__(self, origin=None, end=None, | |
| 35 filled=False, arrowType=EricArrowType.NORMAL, colors=None, | |
| 36 parent=None): | |
| 37 """ | |
| 38 Constructor | |
| 39 | |
| 40 @param origin origin of the arrow | |
| 41 @type QPointF | |
| 42 @param end end point of the arrow | |
| 43 @type QPointF | |
| 44 @param filled flag indicating a filled arrow head | |
| 45 @type bool | |
| 46 @param arrowType arrow type | |
| 47 @type EricArrowType | |
| 48 @param colors tuple containing the foreground and background colors | |
| 49 @type tuple of (QColor, QColor) | |
| 50 @param parent reference to the parent object | |
| 51 @type QGraphicsItem | |
| 52 """ | |
| 53 super().__init__(parent) | |
| 54 | |
| 55 self._origin = QPointF() if origin is None else QPointF(origin) | |
| 56 self._end = QPointF() if end is None else QPointF(end) | |
| 57 self._filled = filled | |
| 58 self.__type = arrowType | |
| 59 | |
| 60 if colors is None: | |
| 61 self._colors = (QColor(Qt.GlobalColor.black), | |
| 62 QColor(Qt.GlobalColor.white)) | |
| 63 else: | |
| 64 self._colors = colors | |
| 65 | |
| 66 self._halfLength = 13.0 | |
| 67 | |
| 68 self.setFlag(QGraphicsItem.GraphicsItemFlag.ItemIsMovable, True) | |
| 69 self.setFlag(QGraphicsItem.GraphicsItemFlag.ItemIsSelectable, True) | |
| 70 | |
| 71 def setPoints(self, xa, ya, xb, yb): | |
| 72 """ | |
| 73 Public method to set the start and end points of the line. | |
| 74 | |
| 75 <b>Note:</b> This method does not redraw the item. | |
| 76 | |
| 77 @param xa x-coordinate of the start point (float) | |
| 78 @param ya y-coordinate of the start point (float) | |
| 79 @param xb x-coordinate of the end point (float) | |
| 80 @param yb y-coordinate of the end point (float) | |
| 81 """ | |
| 82 self._origin = QPointF(xa, ya) | |
| 83 self._end = QPointF(xb, yb) | |
| 84 | |
| 85 def setStartPoint(self, x, y): | |
| 86 """ | |
| 87 Public method to set the start point. | |
| 88 | |
| 89 <b>Note:</b> This method does not redraw the item. | |
| 90 | |
| 91 @param x x-coordinate of the start point (float) | |
| 92 @param y y-coordinate of the start point (float) | |
| 93 """ | |
| 94 self._origin = QPointF(x, y) | |
| 95 | |
| 96 def setEndPoint(self, x, y): | |
| 97 """ | |
| 98 Public method to set the end point. | |
| 99 | |
| 100 <b>Note:</b> This method does not redraw the item. | |
| 101 | |
| 102 @param x x-coordinate of the end point (float) | |
| 103 @param y y-coordinate of the end point (float) | |
| 104 """ | |
| 105 self._end = QPointF(x, y) | |
| 106 | |
| 107 def boundingRect(self): | |
| 108 """ | |
| 109 Public method to return the bounding rectangle. | |
| 110 | |
| 111 @return bounding rectangle (QRectF) | |
| 112 """ | |
| 113 extra = self._halfLength / 2.0 | |
| 114 return QRectF(self._origin, QSizeF(self._end.x() - self._origin.x(), | |
| 115 self._end.y() - self._origin.y()) | |
| 116 ).normalized().adjusted(-extra, -extra, extra, extra) | |
| 117 | |
| 118 def paint(self, painter, option, widget=None): | |
| 119 """ | |
| 120 Public method to paint the item in local coordinates. | |
| 121 | |
| 122 @param painter reference to the painter object (QPainter) | |
| 123 @param option style options (QStyleOptionGraphicsItem) | |
| 124 @param widget optional reference to the widget painted on (QWidget) | |
| 125 """ | |
| 126 width = 2 if ( | |
| 127 (option.state & QStyle.StateFlag.State_Selected) == | |
| 128 QStyle.State(QStyle.StateFlag.State_Selected) | |
| 129 ) else 1 | |
| 130 | |
| 131 # draw the line first | |
| 132 line = QLineF(self._origin, self._end) | |
| 133 painter.setPen( | |
| 134 QPen(self._colors[0], width, Qt.PenStyle.SolidLine, | |
| 135 Qt.PenCapStyle.FlatCap, Qt.PenJoinStyle.MiterJoin)) | |
| 136 painter.drawLine(line) | |
| 137 | |
| 138 # draw the arrow head | |
| 139 arrowAngle = ( | |
| 140 ArrowheadAngleFactor | |
| 141 if self.__type == EricArrowType.NORMAL else | |
| 142 2 * ArrowheadAngleFactor | |
| 143 ) | |
| 144 slope = math.atan2(line.dy(), line.dx()) | |
| 145 | |
| 146 # Calculate left arrow point | |
| 147 arrowSlope = slope + arrowAngle | |
| 148 a1 = QPointF(self._end.x() - self._halfLength * math.cos(arrowSlope), | |
| 149 self._end.y() - self._halfLength * math.sin(arrowSlope)) | |
| 150 | |
| 151 # Calculate right arrow point | |
| 152 arrowSlope = slope - arrowAngle | |
| 153 a2 = QPointF(self._end.x() - self._halfLength * math.cos(arrowSlope), | |
| 154 self._end.y() - self._halfLength * math.sin(arrowSlope)) | |
| 155 | |
| 156 if self._filled: | |
| 157 painter.setBrush(self._colors[0]) | |
| 158 else: | |
| 159 painter.setBrush(self._colors[1]) | |
| 160 polygon = QPolygonF() | |
| 161 polygon.append(line.p2()) | |
| 162 polygon.append(a1) | |
| 163 polygon.append(a2) | |
| 164 painter.drawPolygon(polygon) |
