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1 | 1 | /**************************************************************************** |
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2 | 2 | ** |
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3 | 3 | ** Copyright (C) 2013 Digia Plc |
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4 | 4 | ** All rights reserved. |
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5 | 5 | ** For any questions to Digia, please use contact form at http://qt.digia.com |
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6 | 6 | ** |
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7 | 7 | ** This file is part of the Qt Enterprise Charts Add-on. |
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8 | 8 | ** |
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9 | 9 | ** $QT_BEGIN_LICENSE$ |
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10 | 10 | ** Licensees holding valid Qt Enterprise licenses may use this file in |
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11 | 11 | ** accordance with the Qt Enterprise License Agreement provided with the |
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12 | 12 | ** Software or, alternatively, in accordance with the terms contained in |
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13 | 13 | ** a written agreement between you and Digia. |
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14 | 14 | ** |
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15 | 15 | ** If you have questions regarding the use of this file, please use |
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16 | 16 | ** contact form at http://qt.digia.com |
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17 | 17 | ** $QT_END_LICENSE$ |
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18 | 18 | ** |
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19 | 19 | ****************************************************************************/ |
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20 | 20 | |
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21 | 21 | #include "piesliceitem_p.h" |
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22 | 22 | #include "piechartitem_p.h" |
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23 | 23 | #include "qpieseries.h" |
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24 | 24 | #include "qpieslice.h" |
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25 | 25 | #include "chartpresenter_p.h" |
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26 | 26 | #include <QPainter> |
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27 | 27 | #include <qmath.h> |
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28 | 28 | #include <QGraphicsSceneEvent> |
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29 | 29 | #include <QTime> |
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30 | 30 | #include <QTextDocument> |
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31 | 31 | #include <QDebug> |
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32 | 32 | |
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33 | 33 | QTCOMMERCIALCHART_BEGIN_NAMESPACE |
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34 | 34 | |
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35 | 35 | QPointF offset(qreal angle, qreal length) |
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36 | 36 | { |
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37 | 37 | qreal dx = qSin(angle * (M_PI / 180)) * length; |
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38 | 38 | qreal dy = qCos(angle * (M_PI / 180)) * length; |
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39 | 39 | return QPointF(dx, -dy); |
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40 | 40 | } |
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41 | 41 | |
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42 | 42 | PieSliceItem::PieSliceItem(QGraphicsItem *parent) |
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43 | 43 | : QGraphicsObject(parent), |
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44 | 44 | m_hovered(false) |
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45 | 45 | { |
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46 | 46 | setAcceptHoverEvents(true); |
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47 | 47 | setAcceptedMouseButtons(Qt::MouseButtonMask); |
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48 | 48 | setZValue(ChartPresenter::PieSeriesZValue); |
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49 | 49 | m_labelItem = new QGraphicsTextItem(this); |
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50 | 50 | m_labelItem->document()->setDocumentMargin(1.0); |
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51 | 51 | } |
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52 | 52 | |
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53 | 53 | PieSliceItem::~PieSliceItem() |
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54 | 54 | { |
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55 | 55 | // If user is hovering over the slice and it gets destroyed we do |
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56 | 56 | // not get a hover leave event. So we must emit the signal here. |
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57 | 57 | if (m_hovered) |
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58 | 58 | emit hovered(false); |
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59 | 59 | } |
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60 | 60 | |
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61 | 61 | QRectF PieSliceItem::boundingRect() const |
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62 | 62 | { |
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63 | 63 | return m_boundingRect; |
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64 | 64 | } |
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65 | 65 | |
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66 | 66 | QPainterPath PieSliceItem::shape() const |
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67 | 67 | { |
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68 | 68 | // Don't include the label and label arm. |
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69 | 69 | // This is used to detect a mouse clicks. We do not want clicks from label. |
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70 | 70 | return m_slicePath; |
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71 | 71 | } |
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72 | 72 | |
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73 | 73 | void PieSliceItem::paint(QPainter *painter, const QStyleOptionGraphicsItem * /*option*/, QWidget * /*widget*/) |
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74 | 74 | { |
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75 | 75 | painter->save(); |
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76 | 76 | painter->setClipRect(parentItem()->boundingRect()); |
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77 | 77 | painter->setPen(m_data.m_slicePen); |
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78 | 78 | painter->setBrush(m_data.m_sliceBrush); |
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79 | 79 | painter->drawPath(m_slicePath); |
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80 | 80 | painter->restore(); |
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81 | 81 | |
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82 | 82 | if (m_data.m_isLabelVisible) { |
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83 | 83 | painter->save(); |
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84 | 84 | |
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85 | 85 | // Pen for label arm not defined in the QPieSeries api, let's use brush's color instead |
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86 | 86 | painter->setBrush(m_data.m_labelBrush); |
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87 | 87 | |
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88 | 88 | if (m_data.m_labelPosition == QPieSlice::LabelOutside) { |
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89 | 89 | painter->setClipRect(parentItem()->boundingRect()); |
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90 | 90 | painter->strokePath(m_labelArmPath, m_data.m_labelBrush.color()); |
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91 | 91 | } |
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92 | 92 | |
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93 | 93 | painter->restore(); |
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94 | 94 | } |
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95 | 95 | } |
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96 | 96 | |
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97 | 97 | void PieSliceItem::hoverEnterEvent(QGraphicsSceneHoverEvent * /*event*/) |
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98 | 98 | { |
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99 | 99 | m_hovered = true; |
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100 | 100 | emit hovered(true); |
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101 | 101 | } |
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102 | 102 | |
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103 | 103 | void PieSliceItem::hoverLeaveEvent(QGraphicsSceneHoverEvent * /*event*/) |
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104 | 104 | { |
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105 | 105 | m_hovered = false; |
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106 | 106 | emit hovered(false); |
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107 | 107 | } |
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108 | 108 | |
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109 | 109 | void PieSliceItem::mousePressEvent(QGraphicsSceneMouseEvent *event) |
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110 | 110 | { |
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111 | 111 | emit clicked(event->buttons()); |
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112 | 112 | QGraphicsItem::mousePressEvent(event); |
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113 | 113 | } |
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114 | 114 | |
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115 | 115 | void PieSliceItem::setLayout(const PieSliceData &sliceData) |
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116 | 116 | { |
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117 | 117 | m_data = sliceData; |
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118 | 118 | updateGeometry(); |
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119 | 119 | update(); |
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120 | 120 | } |
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121 | 121 | |
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122 | 122 | void PieSliceItem::updateGeometry() |
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123 | 123 | { |
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124 | 124 | if (m_data.m_radius <= 0) |
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125 | 125 | return; |
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126 | 126 | |
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127 | 127 | prepareGeometryChange(); |
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128 | 128 | |
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129 | 129 | // slice path |
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130 | 130 | qreal centerAngle; |
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131 | 131 | QPointF armStart; |
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132 | 132 | m_slicePath = slicePath(m_data.m_center, m_data.m_radius, m_data.m_startAngle, m_data.m_angleSpan, ¢erAngle, &armStart); |
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133 | 133 | |
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134 | 134 | m_labelItem->setVisible(m_data.m_isLabelVisible); |
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135 | 135 | |
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136 | 136 | if (m_data.m_isLabelVisible) { |
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137 | 137 | // text rect |
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138 | 138 | QFontMetricsF fm(m_data.m_labelFont); |
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139 | 139 | m_labelTextRect = ChartPresenter::textBoundingRect(m_data.m_labelFont, |
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140 | 140 | m_data.m_labelText, |
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141 | 141 | 0); |
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142 | 142 | |
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143 | 143 | QString label(m_data.m_labelText); |
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144 | 144 | m_labelItem->setDefaultTextColor(m_data.m_labelBrush.color()); |
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145 | 145 | m_labelItem->setFont(m_data.m_labelFont); |
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146 | 146 | |
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147 | 147 | // text position |
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148 | 148 | if (m_data.m_labelPosition == QPieSlice::LabelOutside) { |
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149 | 149 | setFlag(QGraphicsItem::ItemClipsChildrenToShape, false); |
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150 | 150 | |
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151 | 151 | // label arm path |
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152 | 152 | QPointF labelTextStart; |
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153 | 153 | m_labelArmPath = labelArmPath(armStart, centerAngle, |
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154 | 154 | m_data.m_radius * m_data.m_labelArmLengthFactor, |
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155 | 155 | m_labelTextRect.width(), &labelTextStart); |
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156 | 156 | |
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157 | 157 | m_labelTextRect.moveBottomLeft(labelTextStart); |
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158 | 158 | if (m_labelTextRect.left() < 0) |
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159 | 159 | m_labelTextRect.setLeft(0); |
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160 | 160 | else if (m_labelTextRect.left() < parentItem()->boundingRect().left()) |
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161 | 161 | m_labelTextRect.setLeft(parentItem()->boundingRect().left()); |
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162 | 162 | if (m_labelTextRect.right() > parentItem()->boundingRect().right()) |
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163 | 163 | m_labelTextRect.setRight(parentItem()->boundingRect().right()); |
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164 | 164 | |
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165 | 165 | if (fm.width(m_data.m_labelText) > m_labelTextRect.width()) { |
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166 | 166 | label = ChartPresenter::truncatedText(m_data.m_labelFont, m_data.m_labelText, |
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167 | 167 | qreal(0.0), m_labelTextRect.width(), |
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168 | 168 | m_labelTextRect.height(), m_labelTextRect); |
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169 | 169 | m_labelArmPath = labelArmPath(armStart, centerAngle, |
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170 | 170 | m_data.m_radius * m_data.m_labelArmLengthFactor, |
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171 | 171 | m_labelTextRect.width(), &labelTextStart); |
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172 | 172 | |
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173 | 173 | m_labelTextRect.moveBottomLeft(labelTextStart); |
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174 | 174 | } |
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175 | 175 | m_labelItem->setTextWidth(m_labelTextRect.width() |
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176 | 176 | + m_labelItem->document()->documentMargin()); |
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177 | 177 | m_labelItem->setHtml(label); |
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178 | m_labelItem->setRotation(0); | |
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178 | 179 | m_labelItem->setPos(m_labelTextRect.x(), m_labelTextRect.y() + 1.0); |
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179 | 180 | } else { |
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180 | 181 | // label inside |
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181 | 182 | setFlag(QGraphicsItem::ItemClipsChildrenToShape); |
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182 | 183 | m_labelItem->setTextWidth(m_labelTextRect.width() |
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183 | 184 | + m_labelItem->document()->documentMargin()); |
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184 | 185 | m_labelItem->setHtml(label); |
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185 | 186 | |
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186 | 187 | QPointF textCenter; |
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187 | 188 | if (m_data.m_holeRadius > 0) { |
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188 | 189 | textCenter = m_data.m_center + offset(centerAngle, m_data.m_holeRadius |
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189 | 190 | + (m_data.m_radius |
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190 | 191 | - m_data.m_holeRadius) / 2); |
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191 | 192 | } else { |
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192 | 193 | textCenter = m_data.m_center + offset(centerAngle, m_data.m_radius / 2); |
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193 | 194 | } |
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194 | 195 | m_labelItem->setPos(textCenter.x() - m_labelItem->boundingRect().width() / 2, |
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195 | 196 | textCenter.y() - fm.height() / 2); |
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196 | 197 | |
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197 | 198 | QPointF labelCenter = m_labelItem->boundingRect().center(); |
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198 | 199 | m_labelItem->setTransformOriginPoint(labelCenter); |
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199 | 200 | |
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200 | 201 | if (m_data.m_labelPosition == QPieSlice::LabelInsideTangential) { |
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201 | 202 | m_labelItem->setRotation(m_data.m_startAngle + m_data.m_angleSpan / 2); |
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202 | 203 | } else if (m_data.m_labelPosition == QPieSlice::LabelInsideNormal) { |
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203 | 204 | if (m_data.m_startAngle + m_data.m_angleSpan / 2 < 180) |
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204 | 205 | m_labelItem->setRotation(m_data.m_startAngle + m_data.m_angleSpan / 2 - 90); |
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205 | 206 | else |
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206 | 207 | m_labelItem->setRotation(m_data.m_startAngle + m_data.m_angleSpan / 2 + 90); |
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207 | 208 | } else { |
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208 | 209 | m_labelItem->setRotation(0); |
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209 | 210 | } |
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210 | 211 | } |
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211 | 212 | } |
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212 | 213 | |
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213 | 214 | // bounding rect |
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214 | 215 | if (m_data.m_isLabelVisible) |
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215 | 216 | m_boundingRect = m_slicePath.boundingRect().united(m_labelArmPath.boundingRect()).united(m_labelTextRect); |
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216 | 217 | else |
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217 | 218 | m_boundingRect = m_slicePath.boundingRect(); |
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218 | 219 | |
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219 | 220 | // Inflate bounding rect by 2/3 pen width to make sure it encompasses whole slice also for thick pens |
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220 | 221 | // and miter joins. |
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221 | 222 | int penWidth = (m_data.m_slicePen.width() * 2) / 3; |
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222 | 223 | m_boundingRect = m_boundingRect.adjusted(-penWidth, -penWidth, penWidth, penWidth); |
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223 | 224 | } |
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224 | 225 | |
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225 | 226 | QPointF PieSliceItem::sliceCenter(QPointF point, qreal radius, QPieSlice *slice) |
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226 | 227 | { |
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227 | 228 | if (slice->isExploded()) { |
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228 | 229 | qreal centerAngle = slice->startAngle() + (slice->angleSpan() / 2); |
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229 | 230 | qreal len = radius * slice->explodeDistanceFactor(); |
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230 | 231 | point += offset(centerAngle, len); |
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231 | 232 | } |
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232 | 233 | return point; |
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233 | 234 | } |
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234 | 235 | |
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235 | 236 | QPainterPath PieSliceItem::slicePath(QPointF center, qreal radius, qreal startAngle, qreal angleSpan, qreal *centerAngle, QPointF *armStart) |
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236 | 237 | { |
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237 | 238 | // calculate center angle |
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238 | 239 | *centerAngle = startAngle + (angleSpan / 2); |
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239 | 240 | |
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240 | 241 | // calculate slice rectangle |
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241 | 242 | QRectF rect(center.x() - radius, center.y() - radius, radius * 2, radius * 2); |
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242 | 243 | |
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243 | 244 | // slice path |
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244 | 245 | QPainterPath path; |
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245 | 246 | if (m_data.m_holeRadius > 0) { |
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246 | 247 | QRectF insideRect(center.x() - m_data.m_holeRadius, center.y() - m_data.m_holeRadius, m_data.m_holeRadius * 2, m_data.m_holeRadius * 2); |
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247 | 248 | path.arcMoveTo(rect, -startAngle + 90); |
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248 | 249 | path.arcTo(rect, -startAngle + 90, -angleSpan); |
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249 | 250 | path.arcTo(insideRect, -startAngle + 90 - angleSpan, angleSpan); |
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250 | 251 | path.closeSubpath(); |
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251 | 252 | } else { |
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252 | 253 | path.moveTo(rect.center()); |
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253 | 254 | path.arcTo(rect, -startAngle + 90, -angleSpan); |
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254 | 255 | path.closeSubpath(); |
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255 | 256 | } |
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256 | 257 | |
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257 | 258 | // calculate label arm start point |
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258 | 259 | *armStart = center; |
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259 | 260 | *armStart += offset(*centerAngle, radius + PIESLICE_LABEL_GAP); |
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260 | 261 | |
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261 | 262 | return path; |
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262 | 263 | } |
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263 | 264 | |
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264 | 265 | QPainterPath PieSliceItem::labelArmPath(QPointF start, qreal angle, qreal length, qreal textWidth, QPointF *textStart) |
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265 | 266 | { |
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266 | 267 | // Normalize the angle to 0-360 range |
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267 | 268 | // NOTE: We are using int here on purpose. Depenging on platform and hardware |
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268 | 269 | // qreal can be a double, float or something the user gives to the Qt configure |
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269 | 270 | // (QT_COORD_TYPE). Compilers do not seem to support modulo for double or float |
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270 | 271 | // but there are fmod() and fmodf() functions for that. So instead of some #ifdef |
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271 | 272 | // that might break we just use int. Precision for this is just fine for our needs. |
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272 | 273 | int normalized = angle * 10.0; |
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273 | 274 | normalized = normalized % 3600; |
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274 | 275 | if (normalized < 0) |
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275 | 276 | normalized += 3600; |
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276 | 277 | angle = (qreal) normalized / 10.0; |
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277 | 278 | |
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278 | 279 | // prevent label arm pointing straight down because it will look bad |
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279 | 280 | if (angle < 180 && angle > 170) |
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280 | 281 | angle = 170; |
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281 | 282 | if (angle > 180 && angle < 190) |
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282 | 283 | angle = 190; |
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283 | 284 | |
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284 | 285 | // line from slice to label |
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285 | 286 | QPointF parm1 = start + offset(angle, length); |
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286 | 287 | |
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287 | 288 | // line to underline the label |
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288 | 289 | QPointF parm2 = parm1; |
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289 | 290 | if (angle < 180) { // arm swings the other way on the left side |
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290 | 291 | parm2 += QPointF(textWidth, 0); |
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291 | 292 | *textStart = parm1; |
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292 | 293 | } else { |
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293 | 294 | parm2 += QPointF(-textWidth, 0); |
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294 | 295 | *textStart = parm2; |
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295 | 296 | } |
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296 | 297 | |
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297 | 298 | QPainterPath path; |
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298 | 299 | path.moveTo(start); |
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299 | 300 | path.lineTo(parm1); |
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300 | 301 | path.lineTo(parm2); |
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301 | 302 | |
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302 | 303 | return path; |
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303 | 304 | } |
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304 | 305 | |
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305 | 306 | #include "moc_piesliceitem_p.cpp" |
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306 | 307 | |
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307 | 308 | QTCOMMERCIALCHART_END_NAMESPACE |
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308 | 309 | |
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