Mercurial Repositories > eric / file comparison
comparison: src/eric7/EricGraphics/EricArrowItem.py
src/eric7/EricGraphics/EricArrowItem.py
- branch
- eric7
- changeset 9209
- b99e7fd55fd3
- parent 8881
- 54e42bc2437a
- child 9221
- bf71ee032bb4
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| 9208:3fc8dfeb6ebe | 9209:b99e7fd55fd3 |
|---|---|
| 1 # -*- coding: utf-8 -*- | |
| 2 | |
| 3 # Copyright (c) 2007 - 2022 Detlev Offenbach <detlev@die-offenbachs.de> | |
| 4 # | |
| 5 | |
| 6 """ | |
| 7 Module implementing a graphics item subclass for an arrow. | |
| 8 """ | |
| 9 | |
| 10 import enum | |
| 11 import math | |
| 12 | |
| 13 from PyQt6.QtCore import QPointF, QRectF, QSizeF, QLineF, Qt | |
| 14 from PyQt6.QtGui import QPen, QPolygonF, QColor | |
| 15 from PyQt6.QtWidgets import QAbstractGraphicsShapeItem, QGraphicsItem, QStyle | |
| 16 | |
| 17 ArrowheadAngleFactor = 0.26179938779914941 | |
| 18 # That is: 0.5 * math.atan(math.sqrt(3.0) / 3.0) | |
| 19 | |
| 20 | |
| 21 class EricArrowType(enum.Enum): | |
| 22 """ | |
| 23 Class defining the arrow types. | |
| 24 """ | |
| 25 NORMAL = 1 | |
| 26 WIDE = 2 | |
| 27 | |
| 28 | |
| 29 class EricArrowItem(QAbstractGraphicsShapeItem): | |
| 30 """ | |
| 31 Class implementing an arrow graphics item subclass. | |
| 32 """ | |
| 33 def __init__(self, origin=None, end=None, | |
| 34 filled=False, arrowType=EricArrowType.NORMAL, colors=None, | |
| 35 parent=None): | |
| 36 """ | |
| 37 Constructor | |
| 38 | |
| 39 @param origin origin of the arrow | |
| 40 @type QPointF | |
| 41 @param end end point of the arrow | |
| 42 @type QPointF | |
| 43 @param filled flag indicating a filled arrow head | |
| 44 @type bool | |
| 45 @param arrowType arrow type | |
| 46 @type EricArrowType | |
| 47 @param colors tuple containing the foreground and background colors | |
| 48 @type tuple of (QColor, QColor) | |
| 49 @param parent reference to the parent object | |
| 50 @type QGraphicsItem | |
| 51 """ | |
| 52 super().__init__(parent) | |
| 53 | |
| 54 self._origin = QPointF() if origin is None else QPointF(origin) | |
| 55 self._end = QPointF() if end is None else QPointF(end) | |
| 56 self._filled = filled | |
| 57 self.__type = arrowType | |
| 58 | |
| 59 if colors is None: | |
| 60 self._colors = (QColor(Qt.GlobalColor.black), | |
| 61 QColor(Qt.GlobalColor.white)) | |
| 62 else: | |
| 63 self._colors = colors | |
| 64 | |
| 65 self._halfLength = 13.0 | |
| 66 | |
| 67 self.setFlag(QGraphicsItem.GraphicsItemFlag.ItemIsMovable, True) | |
| 68 self.setFlag(QGraphicsItem.GraphicsItemFlag.ItemIsSelectable, True) | |
| 69 | |
| 70 def setPoints(self, xa, ya, xb, yb): | |
| 71 """ | |
| 72 Public method to set the start and end points of the line. | |
| 73 | |
| 74 <b>Note:</b> This method does not redraw the item. | |
| 75 | |
| 76 @param xa x-coordinate of the start point (float) | |
| 77 @param ya y-coordinate of the start point (float) | |
| 78 @param xb x-coordinate of the end point (float) | |
| 79 @param yb y-coordinate of the end point (float) | |
| 80 """ | |
| 81 self._origin = QPointF(xa, ya) | |
| 82 self._end = QPointF(xb, yb) | |
| 83 | |
| 84 def setStartPoint(self, x, y): | |
| 85 """ | |
| 86 Public method to set the start point. | |
| 87 | |
| 88 <b>Note:</b> This method does not redraw the item. | |
| 89 | |
| 90 @param x x-coordinate of the start point (float) | |
| 91 @param y y-coordinate of the start point (float) | |
| 92 """ | |
| 93 self._origin = QPointF(x, y) | |
| 94 | |
| 95 def setEndPoint(self, x, y): | |
| 96 """ | |
| 97 Public method to set the end point. | |
| 98 | |
| 99 <b>Note:</b> This method does not redraw the item. | |
| 100 | |
| 101 @param x x-coordinate of the end point (float) | |
| 102 @param y y-coordinate of the end point (float) | |
| 103 """ | |
| 104 self._end = QPointF(x, y) | |
| 105 | |
| 106 def boundingRect(self): | |
| 107 """ | |
| 108 Public method to return the bounding rectangle. | |
| 109 | |
| 110 @return bounding rectangle (QRectF) | |
| 111 """ | |
| 112 extra = self._halfLength / 2.0 | |
| 113 return QRectF(self._origin, QSizeF(self._end.x() - self._origin.x(), | |
| 114 self._end.y() - self._origin.y()) | |
| 115 ).normalized().adjusted(-extra, -extra, extra, extra) | |
| 116 | |
| 117 def paint(self, painter, option, widget=None): | |
| 118 """ | |
| 119 Public method to paint the item in local coordinates. | |
| 120 | |
| 121 @param painter reference to the painter object (QPainter) | |
| 122 @param option style options (QStyleOptionGraphicsItem) | |
| 123 @param widget optional reference to the widget painted on (QWidget) | |
| 124 """ | |
| 125 width = 2 if ( | |
| 126 (option.state & QStyle.StateFlag.State_Selected) == | |
| 127 QStyle.StateFlag.State_Selected | |
| 128 ) else 1 | |
| 129 | |
| 130 # draw the line first | |
| 131 line = QLineF(self._origin, self._end) | |
| 132 painter.setPen( | |
| 133 QPen(self._colors[0], width, Qt.PenStyle.SolidLine, | |
| 134 Qt.PenCapStyle.FlatCap, Qt.PenJoinStyle.MiterJoin)) | |
| 135 painter.drawLine(line) | |
| 136 | |
| 137 # draw the arrow head | |
| 138 arrowAngle = ( | |
| 139 ArrowheadAngleFactor | |
| 140 if self.__type == EricArrowType.NORMAL else | |
| 141 2 * ArrowheadAngleFactor | |
| 142 ) | |
| 143 slope = math.atan2(line.dy(), line.dx()) | |
| 144 | |
| 145 # Calculate left arrow point | |
| 146 arrowSlope = slope + arrowAngle | |
| 147 a1 = QPointF(self._end.x() - self._halfLength * math.cos(arrowSlope), | |
| 148 self._end.y() - self._halfLength * math.sin(arrowSlope)) | |
| 149 | |
| 150 # Calculate right arrow point | |
| 151 arrowSlope = slope - arrowAngle | |
| 152 a2 = QPointF(self._end.x() - self._halfLength * math.cos(arrowSlope), | |
| 153 self._end.y() - self._halfLength * math.sin(arrowSlope)) | |
| 154 | |
| 155 if self._filled: | |
| 156 painter.setBrush(self._colors[0]) | |
| 157 else: | |
| 158 painter.setBrush(self._colors[1]) | |
| 159 polygon = QPolygonF() | |
| 160 polygon.append(line.p2()) | |
| 161 polygon.append(a1) | |
| 162 polygon.append(a2) | |
| 163 painter.drawPolygon(polygon) |
