Sat, 02 Jan 2010 18:19:35 +0000
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1 | <?xml version="1.0" encoding="utf-8"?> |
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2 | <!DOCTYPE html PUBLIC '-//W3C//DTD XHTML 1.0 Strict//EN' |
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3 | 'http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd'> |
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4 | <html><head> |
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5 | <title>eric5.Graphics.AssociationItem</title> |
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6 | <style> |
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7 | b'body {\n background:white;\n margin: 0em 1em 10em 1em;\n color: black;\n}\n\nh1 { color: white; background: #4FA4FF; }\nh2 { color: white; background: #4FA4FF; }\nh3 { color: white; background: #00557F; }\nh4 { color: white; background: #00557F; }\n \na { color: #AA5500; }\n' |
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8 | </style> |
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9 | </head> |
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10 | <body><a NAME="top" ID="top"></a> |
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11 | <h1>eric5.Graphics.AssociationItem</h1> |
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12 | <p> |
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13 | Module implementing a graphics item for an association between two items. |
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14 | </p> |
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15 | <h3>Global Attributes</h3> |
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16 | <table> |
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17 | <tr><td>Center</td></tr><tr><td>East</td></tr><tr><td>Generalisation</td></tr><tr><td>Imports</td></tr><tr><td>NoRegion</td></tr><tr><td>Normal</td></tr><tr><td>North</td></tr><tr><td>NorthEast</td></tr><tr><td>NorthWest</td></tr><tr><td>South</td></tr><tr><td>SouthEast</td></tr><tr><td>SouthWest</td></tr><tr><td>West</td></tr> |
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18 | </table> |
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19 | <h3>Classes</h3> |
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20 | <table> |
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21 | <tr> |
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22 | <td><a href="#AssociationItem">AssociationItem</a></td> |
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23 | <td>Class implementing a graphics item for an association between two items.</td> |
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24 | </tr> |
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25 | </table> |
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26 | <h3>Functions</h3> |
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27 | <table> |
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28 | <tr><td>None</td></tr> |
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29 | </table> |
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30 | <hr /><hr /> |
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31 | <a NAME="AssociationItem" ID="AssociationItem"></a> |
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32 | <h2>AssociationItem</h2> |
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33 | <p> |
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34 | Class implementing a graphics item for an association between two items. |
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35 | </p><p> |
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36 | The association is drawn as an arrow starting at the first items and |
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37 | ending at the second. |
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38 | </p> |
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39 | <h3>Derived from</h3> |
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40 | E4ArrowItem |
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41 | <h3>Class Attributes</h3> |
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42 | <table> |
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43 | <tr><td>None</td></tr> |
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44 | </table> |
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45 | <h3>Methods</h3> |
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46 | <table> |
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47 | <tr> |
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48 | <td><a href="#AssociationItem.__init__">AssociationItem</a></td> |
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49 | <td>Constructor</td> |
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50 | </tr><tr> |
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51 | <td><a href="#AssociationItem.__calculateEndingPoints_center">__calculateEndingPoints_center</a></td> |
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52 | <td>Private method to calculate the ending points of the association item.</td> |
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53 | </tr><tr> |
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54 | <td><a href="#AssociationItem.__calculateEndingPoints_rectangle">__calculateEndingPoints_rectangle</a></td> |
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55 | <td>Private method to calculate the ending points of the association item.</td> |
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56 | </tr><tr> |
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57 | <td><a href="#AssociationItem.__findIntersection">__findIntersection</a></td> |
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58 | <td>Method to calculate the intersection point of two lines.</td> |
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59 | </tr><tr> |
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60 | <td><a href="#AssociationItem.__findPointRegion">__findPointRegion</a></td> |
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61 | <td>Private method to find out, which region of rectangle rect contains the point (PosX, PosY) and returns the region number.</td> |
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62 | </tr><tr> |
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63 | <td><a href="#AssociationItem.__findRectIntersectionPoint">__findRectIntersectionPoint</a></td> |
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64 | <td>Private method to find the intersetion point of a line with a rectangle.</td> |
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65 | </tr><tr> |
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66 | <td><a href="#AssociationItem.__mapRectFromItem">__mapRectFromItem</a></td> |
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67 | <td>Private method to map item's rectangle to this item's coordinate system.</td> |
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68 | </tr><tr> |
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69 | <td><a href="#AssociationItem.__updateEndPoint">__updateEndPoint</a></td> |
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70 | <td>Private method to update an endpoint.</td> |
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71 | </tr><tr> |
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72 | <td><a href="#AssociationItem.unassociate">unassociate</a></td> |
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73 | <td>Public method to unassociate from the widgets.</td> |
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74 | </tr><tr> |
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75 | <td><a href="#AssociationItem.widgetMoved">widgetMoved</a></td> |
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76 | <td>Public method to recalculate the association after a widget was moved.</td> |
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77 | </tr> |
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78 | </table> |
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79 | <a NAME="AssociationItem.__init__" ID="AssociationItem.__init__"></a> |
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80 | <h4>AssociationItem (Constructor)</h4> |
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81 | <b>AssociationItem</b>(<i>itemA, itemB, type = Normal, parent = None</i>) |
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82 | <p> |
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83 | Constructor |
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84 | </p><dl> |
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85 | <dt><i>itemA</i></dt> |
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86 | <dd> |
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87 | first widget of the association |
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88 | </dd><dt><i>itemB</i></dt> |
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89 | <dd> |
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90 | second widget of the association |
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91 | </dd><dt><i>type</i></dt> |
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92 | <dd> |
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93 | type of the association. This must be one of |
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94 | <ul> |
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95 | <li>Normal (default)</li> |
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96 | <li>Generalisation</li> |
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97 | <li>Imports</li> |
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98 | </ul> |
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99 | </dd><dt><i>parent=</i></dt> |
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100 | <dd> |
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101 | reference to the parent object (QGraphicsItem) |
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102 | </dd> |
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103 | </dl><a NAME="AssociationItem.__calculateEndingPoints_center" ID="AssociationItem.__calculateEndingPoints_center"></a> |
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104 | <h4>AssociationItem.__calculateEndingPoints_center</h4> |
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105 | <b>__calculateEndingPoints_center</b>(<i></i>) |
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106 | <p> |
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107 | Private method to calculate the ending points of the association item. |
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108 | </p><p> |
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109 | The ending points are calculated from the centers of the |
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110 | two associated items. |
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111 | </p><a NAME="AssociationItem.__calculateEndingPoints_rectangle" ID="AssociationItem.__calculateEndingPoints_rectangle"></a> |
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112 | <h4>AssociationItem.__calculateEndingPoints_rectangle</h4> |
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113 | <b>__calculateEndingPoints_rectangle</b>(<i></i>) |
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114 | <p> |
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115 | Private method to calculate the ending points of the association item. |
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116 | </p><p> |
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117 | The ending points are calculated by the following method. |
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118 | </p><p> |
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119 | For each item the diagram is divided in four Regions by its diagonals |
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120 | as indicated below |
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121 | <pre> |
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122 | \ Region 2 / |
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123 | \ / |
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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|
124 | |--------| |
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Detlev Offenbach <detlev@die-offenbachs.de>
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125 | | \ / | |
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Detlev Offenbach <detlev@die-offenbachs.de>
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126 | | \ / | |
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Detlev Offenbach <detlev@die-offenbachs.de>
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127 | | \/ | |
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Detlev Offenbach <detlev@die-offenbachs.de>
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128 | Region 1 | /\ | Region 3 |
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129 | | / \ | |
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Detlev Offenbach <detlev@die-offenbachs.de>
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130 | | / \ | |
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Detlev Offenbach <detlev@die-offenbachs.de>
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131 | |--------| |
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Detlev Offenbach <detlev@die-offenbachs.de>
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132 | / \ |
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Detlev Offenbach <detlev@die-offenbachs.de>
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133 | / Region 4 \ |
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Detlev Offenbach <detlev@die-offenbachs.de>
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134 | </pre> |
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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135 | </p><p> |
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Detlev Offenbach <detlev@die-offenbachs.de>
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|
136 | Each diagonal is defined by two corners of the bounding rectangle |
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Detlev Offenbach <detlev@die-offenbachs.de>
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137 | </p><p> |
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Detlev Offenbach <detlev@die-offenbachs.de>
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138 | To calculate the start point we have to find out in which |
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Detlev Offenbach <detlev@die-offenbachs.de>
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139 | region (defined by itemA's diagonals) is itemB's TopLeft corner |
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140 | (lets call it region M). After that the start point will be |
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Detlev Offenbach <detlev@die-offenbachs.de>
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141 | the middle point of rectangle's side contained in region M. |
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Detlev Offenbach <detlev@die-offenbachs.de>
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142 | </p><p> |
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143 | To calculate the end point we repeat the above but in the opposite direction |
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Detlev Offenbach <detlev@die-offenbachs.de>
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144 | (from itemB to itemA) |
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Detlev Offenbach <detlev@die-offenbachs.de>
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145 | </p><a NAME="AssociationItem.__findIntersection" ID="AssociationItem.__findIntersection"></a> |
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146 | <h4>AssociationItem.__findIntersection</h4> |
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147 | <b>__findIntersection</b>(<i>p1, p2, p3, p4</i>) |
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Detlev Offenbach <detlev@die-offenbachs.de>
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148 | <p> |
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Detlev Offenbach <detlev@die-offenbachs.de>
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149 | Method to calculate the intersection point of two lines. |
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150 | </p><p> |
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151 | The first line is determined by the points p1 and p2, the second |
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152 | line by p3 and p4. If the intersection point is not contained in |
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153 | the segment p1p2, then it returns (-1.0, -1.0). |
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Detlev Offenbach <detlev@die-offenbachs.de>
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154 | </p><p> |
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Detlev Offenbach <detlev@die-offenbachs.de>
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155 | For the function's internal calculations remember:<br /> |
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156 | QT coordinates start with the point (0,0) as the topleft corner |
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157 | and x-values increase from left to right and y-values increase |
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158 | from top to bottom; it means the visible area is quadrant I in |
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159 | the regular XY coordinate system |
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Detlev Offenbach <detlev@die-offenbachs.de>
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160 | </p><p> |
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Detlev Offenbach <detlev@die-offenbachs.de>
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|
161 | <pre> |
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Detlev Offenbach <detlev@die-offenbachs.de>
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|
162 | Quadrant II | Quadrant I |
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Detlev Offenbach <detlev@die-offenbachs.de>
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|
163 | -----------------|----------------- |
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Detlev Offenbach <detlev@die-offenbachs.de>
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164 | Quadrant III | Quadrant IV |
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Detlev Offenbach <detlev@die-offenbachs.de>
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165 | </pre> |
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Detlev Offenbach <detlev@die-offenbachs.de>
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|
166 | </p><p> |
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167 | In order for the linear function calculations to work in this method |
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168 | we must switch x and y values (x values become y values and viceversa) |
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|
169 | </p><dl> |
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170 | <dt><i>p1</i></dt> |
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171 | <dd> |
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172 | first point of first line (QPointF) |
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Detlev Offenbach <detlev@die-offenbachs.de>
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173 | </dd><dt><i>p2</i></dt> |
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Detlev Offenbach <detlev@die-offenbachs.de>
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174 | <dd> |
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Detlev Offenbach <detlev@die-offenbachs.de>
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175 | second point of first line (QPointF) |
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Detlev Offenbach <detlev@die-offenbachs.de>
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|
176 | </dd><dt><i>p3</i></dt> |
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Detlev Offenbach <detlev@die-offenbachs.de>
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177 | <dd> |
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Detlev Offenbach <detlev@die-offenbachs.de>
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178 | first point of second line (QPointF) |
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Detlev Offenbach <detlev@die-offenbachs.de>
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|
179 | </dd><dt><i>p4</i></dt> |
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180 | <dd> |
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Detlev Offenbach <detlev@die-offenbachs.de>
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181 | second point of second line (QPointF) |
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Detlev Offenbach <detlev@die-offenbachs.de>
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|
182 | </dd> |
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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|
183 | </dl><dl> |
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Detlev Offenbach <detlev@die-offenbachs.de>
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|
184 | <dt>Returns:</dt> |
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|
185 | <dd> |
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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|
186 | the intersection point (QPointF) |
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Detlev Offenbach <detlev@die-offenbachs.de>
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|
187 | </dd> |
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Detlev Offenbach <detlev@die-offenbachs.de>
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188 | </dl><a NAME="AssociationItem.__findPointRegion" ID="AssociationItem.__findPointRegion"></a> |
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parents:
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|
189 | <h4>AssociationItem.__findPointRegion</h4> |
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|
190 | <b>__findPointRegion</b>(<i>rect, posX, posY</i>) |
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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|
191 | <p> |
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192 | Private method to find out, which region of rectangle rect contains the point |
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193 | (PosX, PosY) and returns the region number. |
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parents:
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|
194 | </p><dl> |
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195 | <dt><i>rect</i></dt> |
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196 | <dd> |
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Detlev Offenbach <detlev@die-offenbachs.de>
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197 | rectangle to calculate the region for (QRectF) |
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198 | </dd><dt><i>posX</i></dt> |
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199 | <dd> |
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Detlev Offenbach <detlev@die-offenbachs.de>
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200 | x position of point (float) |
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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201 | </dd><dt><i>posY</i></dt> |
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202 | <dd> |
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Detlev Offenbach <detlev@die-offenbachs.de>
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|
203 | y position of point (float) |
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Detlev Offenbach <detlev@die-offenbachs.de>
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|
204 | </dd> |
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Detlev Offenbach <detlev@die-offenbachs.de>
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|
205 | </dl><dl> |
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Detlev Offenbach <detlev@die-offenbachs.de>
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|
206 | <dt>Returns:</dt> |
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Detlev Offenbach <detlev@die-offenbachs.de>
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|
207 | <dd> |
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Detlev Offenbach <detlev@die-offenbachs.de>
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|
208 | the calculated region number<br /> |
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Detlev Offenbach <detlev@die-offenbachs.de>
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|
209 | West = Region 1<br /> |
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Detlev Offenbach <detlev@die-offenbachs.de>
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|
210 | North = Region 2<br /> |
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Detlev Offenbach <detlev@die-offenbachs.de>
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|
211 | East = Region 3<br /> |
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Detlev Offenbach <detlev@die-offenbachs.de>
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|
212 | South = Region 4<br /> |
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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213 | NorthWest = On diagonal 2 between Region 1 and 2<br /> |
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parents:
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214 | NorthEast = On diagonal 1 between Region 2 and 3<br /> |
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parents:
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215 | SouthEast = On diagonal 2 between Region 3 and 4<br /> |
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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|
216 | SouthWest = On diagonal 1 between Region4 and 1<br /> |
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Detlev Offenbach <detlev@die-offenbachs.de>
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217 | Center = On diagonal 1 and On diagonal 2 (the center)<br /> |
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Detlev Offenbach <detlev@die-offenbachs.de>
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|
218 | </dd> |
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Detlev Offenbach <detlev@die-offenbachs.de>
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|
219 | </dl><a NAME="AssociationItem.__findRectIntersectionPoint" ID="AssociationItem.__findRectIntersectionPoint"></a> |
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parents:
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|
220 | <h4>AssociationItem.__findRectIntersectionPoint</h4> |
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|
221 | <b>__findRectIntersectionPoint</b>(<i>item, p1, p2</i>) |
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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222 | <p> |
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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|
223 | Private method to find the intersetion point of a line with a rectangle. |
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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|
224 | </p><dl> |
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Detlev Offenbach <detlev@die-offenbachs.de>
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|
225 | <dt><i>item</i></dt> |
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|
226 | <dd> |
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Detlev Offenbach <detlev@die-offenbachs.de>
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|
227 | item to check against |
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Detlev Offenbach <detlev@die-offenbachs.de>
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|
228 | </dd><dt><i>p1</i></dt> |
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Detlev Offenbach <detlev@die-offenbachs.de>
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|
229 | <dd> |
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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|
230 | first point of the line (QPointF) |
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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|
231 | </dd><dt><i>p2</i></dt> |
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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|
232 | <dd> |
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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|
233 | second point of the line (QPointF) |
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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|
234 | </dd> |
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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|
235 | </dl><dl> |
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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|
236 | <dt>Returns:</dt> |
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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|
237 | <dd> |
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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|
238 | the intersection point (QPointF) |
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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|
239 | </dd> |
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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|
240 | </dl><a NAME="AssociationItem.__mapRectFromItem" ID="AssociationItem.__mapRectFromItem"></a> |
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Updated documentation.
Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff
changeset
|
241 | <h4>AssociationItem.__mapRectFromItem</h4> |
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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changeset
|
242 | <b>__mapRectFromItem</b>(<i>item</i>) |
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Updated documentation.
Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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changeset
|
243 | <p> |
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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changeset
|
244 | Private method to map item's rectangle to this item's coordinate system. |
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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changeset
|
245 | </p><dl> |
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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changeset
|
246 | <dt><i>item</i></dt> |
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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|
247 | <dd> |
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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|
248 | reference to the item to be mapped (QGraphicsRectItem) |
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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|
249 | </dd> |
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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|
250 | </dl><dl> |
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Updated documentation.
Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff
changeset
|
251 | <dt>Returns:</dt> |
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Detlev Offenbach <detlev@die-offenbachs.de>
parents:
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|
252 | <dd> |
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Updated documentation.
Detlev Offenbach <detlev@die-offenbachs.de>
parents:
diff
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253 | item's rectangle in local coordinates (QRectF) |
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254 | </dd> |
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255 | </dl><a NAME="AssociationItem.__updateEndPoint" ID="AssociationItem.__updateEndPoint"></a> |
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256 | <h4>AssociationItem.__updateEndPoint</h4> |
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257 | <b>__updateEndPoint</b>(<i>region, isWidgetA</i>) |
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258 | <p> |
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259 | Private method to update an endpoint. |
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260 | </p><dl> |
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261 | <dt><i>region</i></dt> |
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262 | <dd> |
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263 | the region for the endpoint (integer) |
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264 | </dd><dt><i>isWidgetA</i></dt> |
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265 | <dd> |
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266 | flag indicating update for itemA is done (boolean) |
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267 | </dd> |
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268 | </dl><a NAME="AssociationItem.unassociate" ID="AssociationItem.unassociate"></a> |
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269 | <h4>AssociationItem.unassociate</h4> |
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270 | <b>unassociate</b>(<i></i>) |
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271 | <p> |
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272 | Public method to unassociate from the widgets. |
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273 | </p><a NAME="AssociationItem.widgetMoved" ID="AssociationItem.widgetMoved"></a> |
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274 | <h4>AssociationItem.widgetMoved</h4> |
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275 | <b>widgetMoved</b>(<i></i>) |
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276 | <p> |
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277 | Public method to recalculate the association after a widget was moved. |
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278 | </p> |
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279 | <div align="right"><a href="#top">Up</a></div> |
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280 | <hr /> |
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281 | </body></html> |