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Fix pie slice label visibility and position on change...
Titta Heikkala -
r2628:c23615f6e192
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1 1 /****************************************************************************
2 2 **
3 3 ** Copyright (C) 2013 Digia Plc
4 4 ** All rights reserved.
5 5 ** For any questions to Digia, please use contact form at http://qt.digia.com
6 6 **
7 7 ** This file is part of the Qt Enterprise Charts Add-on.
8 8 **
9 9 ** $QT_BEGIN_LICENSE$
10 10 ** Licensees holding valid Qt Enterprise licenses may use this file in
11 11 ** accordance with the Qt Enterprise License Agreement provided with the
12 12 ** Software or, alternatively, in accordance with the terms contained in
13 13 ** a written agreement between you and Digia.
14 14 **
15 15 ** If you have questions regarding the use of this file, please use
16 16 ** contact form at http://qt.digia.com
17 17 ** $QT_END_LICENSE$
18 18 **
19 19 ****************************************************************************/
20 20
21 21 #include "piesliceitem_p.h"
22 22 #include "piechartitem_p.h"
23 23 #include "qpieseries.h"
24 24 #include "qpieslice.h"
25 25 #include "chartpresenter_p.h"
26 26 #include <QPainter>
27 27 #include <qmath.h>
28 28 #include <QGraphicsSceneEvent>
29 29 #include <QTime>
30 30 #include <QTextDocument>
31 31 #include <QDebug>
32 32
33 33 QTCOMMERCIALCHART_BEGIN_NAMESPACE
34 34
35 35 QPointF offset(qreal angle, qreal length)
36 36 {
37 37 qreal dx = qSin(angle * (M_PI / 180)) * length;
38 38 qreal dy = qCos(angle * (M_PI / 180)) * length;
39 39 return QPointF(dx, -dy);
40 40 }
41 41
42 42 PieSliceItem::PieSliceItem(QGraphicsItem *parent)
43 43 : QGraphicsObject(parent),
44 44 m_hovered(false)
45 45 {
46 46 setAcceptHoverEvents(true);
47 47 setAcceptedMouseButtons(Qt::MouseButtonMask);
48 48 setZValue(ChartPresenter::PieSeriesZValue);
49 49 m_labelItem = new QGraphicsTextItem(this);
50 50 m_labelItem->document()->setDocumentMargin(1.0);
51 51 }
52 52
53 53 PieSliceItem::~PieSliceItem()
54 54 {
55 55 // If user is hovering over the slice and it gets destroyed we do
56 56 // not get a hover leave event. So we must emit the signal here.
57 57 if (m_hovered)
58 58 emit hovered(false);
59 59 }
60 60
61 61 QRectF PieSliceItem::boundingRect() const
62 62 {
63 63 return m_boundingRect;
64 64 }
65 65
66 66 QPainterPath PieSliceItem::shape() const
67 67 {
68 68 // Don't include the label and label arm.
69 69 // This is used to detect a mouse clicks. We do not want clicks from label.
70 70 return m_slicePath;
71 71 }
72 72
73 73 void PieSliceItem::paint(QPainter *painter, const QStyleOptionGraphicsItem * /*option*/, QWidget * /*widget*/)
74 74 {
75 75 painter->save();
76 76 painter->setClipRect(parentItem()->boundingRect());
77 77 painter->setPen(m_data.m_slicePen);
78 78 painter->setBrush(m_data.m_sliceBrush);
79 79 painter->drawPath(m_slicePath);
80 80 painter->restore();
81 81
82 82 if (m_data.m_isLabelVisible) {
83 83 painter->save();
84 84
85 85 // Pen for label arm not defined in the QPieSeries api, let's use brush's color instead
86 86 painter->setBrush(m_data.m_labelBrush);
87 87
88 88 if (m_data.m_labelPosition == QPieSlice::LabelOutside) {
89 89 painter->setClipRect(parentItem()->boundingRect());
90 90 painter->strokePath(m_labelArmPath, m_data.m_labelBrush.color());
91 91 }
92 92
93 93 painter->restore();
94 94 }
95 95 }
96 96
97 97 void PieSliceItem::hoverEnterEvent(QGraphicsSceneHoverEvent * /*event*/)
98 98 {
99 99 m_hovered = true;
100 100 emit hovered(true);
101 101 }
102 102
103 103 void PieSliceItem::hoverLeaveEvent(QGraphicsSceneHoverEvent * /*event*/)
104 104 {
105 105 m_hovered = false;
106 106 emit hovered(false);
107 107 }
108 108
109 109 void PieSliceItem::mousePressEvent(QGraphicsSceneMouseEvent *event)
110 110 {
111 111 emit clicked(event->buttons());
112 112 QGraphicsItem::mousePressEvent(event);
113 113 }
114 114
115 115 void PieSliceItem::setLayout(const PieSliceData &sliceData)
116 116 {
117 117 m_data = sliceData;
118 118 updateGeometry();
119 119 update();
120 120 }
121 121
122 122 void PieSliceItem::updateGeometry()
123 123 {
124 124 if (m_data.m_radius <= 0)
125 125 return;
126 126
127 127 prepareGeometryChange();
128 128
129 129 // slice path
130 130 qreal centerAngle;
131 131 QPointF armStart;
132 132 m_slicePath = slicePath(m_data.m_center, m_data.m_radius, m_data.m_startAngle, m_data.m_angleSpan, &centerAngle, &armStart);
133 133
134 m_labelItem->setVisible(m_data.m_isLabelVisible);
135
134 136 if (m_data.m_isLabelVisible) {
135 137 // text rect
136 138 QFontMetricsF fm(m_data.m_labelFont);
137 139 m_labelTextRect = ChartPresenter::textBoundingRect(m_data.m_labelFont,
138 140 m_data.m_labelText,
139 141 0);
140 142
141 143 QString label(m_data.m_labelText);
142 m_labelItem->setVisible(m_data.m_isLabelVisible);
143 144 m_labelItem->setDefaultTextColor(m_data.m_labelBrush.color());
144 145 m_labelItem->setFont(m_data.m_labelFont);
145 146
146 147 // text position
147 148 if (m_data.m_labelPosition == QPieSlice::LabelOutside) {
148 149 setFlag(QGraphicsItem::ItemClipsChildrenToShape, false);
149 150
150 151 // label arm path
151 152 QPointF labelTextStart;
152 153 m_labelArmPath = labelArmPath(armStart, centerAngle,
153 154 m_data.m_radius * m_data.m_labelArmLengthFactor,
154 155 m_labelTextRect.width(), &labelTextStart);
155 156
156 157 m_labelTextRect.moveBottomLeft(labelTextStart);
157 158 if (m_labelTextRect.left() < 0)
158 159 m_labelTextRect.setLeft(0);
159 160 else if (m_labelTextRect.left() < parentItem()->boundingRect().left())
160 161 m_labelTextRect.setLeft(parentItem()->boundingRect().left());
161 162 if (m_labelTextRect.right() > parentItem()->boundingRect().right())
162 163 m_labelTextRect.setRight(parentItem()->boundingRect().right());
163 164
164 165 if (fm.width(m_data.m_labelText) > m_labelTextRect.width()) {
165 166 label = ChartPresenter::truncatedText(m_data.m_labelFont, m_data.m_labelText,
166 167 qreal(0.0), m_labelTextRect.width(),
167 168 m_labelTextRect.height(), m_labelTextRect);
168 169 m_labelArmPath = labelArmPath(armStart, centerAngle,
169 170 m_data.m_radius * m_data.m_labelArmLengthFactor,
170 171 m_labelTextRect.width(), &labelTextStart);
171 172
172 173 m_labelTextRect.moveBottomLeft(labelTextStart);
173 174 }
174 175 m_labelItem->setTextWidth(m_labelTextRect.width()
175 176 + m_labelItem->document()->documentMargin());
176 177 m_labelItem->setHtml(label);
177 178 m_labelItem->setPos(m_labelTextRect.x(), m_labelTextRect.y() + 1.0);
178 179 } else {
179 180 // label inside
180 181 setFlag(QGraphicsItem::ItemClipsChildrenToShape);
181 182 m_labelItem->setTextWidth(m_labelTextRect.width()
182 183 + m_labelItem->document()->documentMargin());
183 184 m_labelItem->setHtml(label);
184 185
185 186 QPointF textCenter;
186 187 if (m_data.m_holeRadius > 0) {
187 188 textCenter = m_data.m_center + offset(centerAngle, m_data.m_holeRadius
188 189 + (m_data.m_radius
189 190 - m_data.m_holeRadius) / 2);
190 191 } else {
191 192 textCenter = m_data.m_center + offset(centerAngle, m_data.m_radius / 2);
192 193 }
193 194 m_labelItem->setPos(textCenter.x() - m_labelItem->boundingRect().width() / 2,
194 195 textCenter.y() - fm.height() / 2);
195 196
196 197 QPointF labelCenter = m_labelItem->boundingRect().center();
197 198 m_labelItem->setTransformOriginPoint(labelCenter);
198 199
199 200 if (m_data.m_labelPosition == QPieSlice::LabelInsideTangential) {
200 201 m_labelItem->setRotation(m_data.m_startAngle + m_data.m_angleSpan / 2);
201 202 } else if (m_data.m_labelPosition == QPieSlice::LabelInsideNormal) {
202 203 if (m_data.m_startAngle + m_data.m_angleSpan / 2 < 180)
203 204 m_labelItem->setRotation(m_data.m_startAngle + m_data.m_angleSpan / 2 - 90);
204 205 else
205 206 m_labelItem->setRotation(m_data.m_startAngle + m_data.m_angleSpan / 2 + 90);
207 } else {
208 m_labelItem->setRotation(0);
206 209 }
207 210 }
208 211 }
209 212
210 213 // bounding rect
211 214 if (m_data.m_isLabelVisible)
212 215 m_boundingRect = m_slicePath.boundingRect().united(m_labelArmPath.boundingRect()).united(m_labelTextRect);
213 216 else
214 217 m_boundingRect = m_slicePath.boundingRect();
215 218
216 219 // Inflate bounding rect by 2/3 pen width to make sure it encompasses whole slice also for thick pens
217 220 // and miter joins.
218 221 int penWidth = (m_data.m_slicePen.width() * 2) / 3;
219 222 m_boundingRect = m_boundingRect.adjusted(-penWidth, -penWidth, penWidth, penWidth);
220 223 }
221 224
222 225 QPointF PieSliceItem::sliceCenter(QPointF point, qreal radius, QPieSlice *slice)
223 226 {
224 227 if (slice->isExploded()) {
225 228 qreal centerAngle = slice->startAngle() + (slice->angleSpan() / 2);
226 229 qreal len = radius * slice->explodeDistanceFactor();
227 230 point += offset(centerAngle, len);
228 231 }
229 232 return point;
230 233 }
231 234
232 235 QPainterPath PieSliceItem::slicePath(QPointF center, qreal radius, qreal startAngle, qreal angleSpan, qreal *centerAngle, QPointF *armStart)
233 236 {
234 237 // calculate center angle
235 238 *centerAngle = startAngle + (angleSpan / 2);
236 239
237 240 // calculate slice rectangle
238 241 QRectF rect(center.x() - radius, center.y() - radius, radius * 2, radius * 2);
239 242
240 243 // slice path
241 244 QPainterPath path;
242 245 if (m_data.m_holeRadius > 0) {
243 246 QRectF insideRect(center.x() - m_data.m_holeRadius, center.y() - m_data.m_holeRadius, m_data.m_holeRadius * 2, m_data.m_holeRadius * 2);
244 247 path.arcMoveTo(rect, -startAngle + 90);
245 248 path.arcTo(rect, -startAngle + 90, -angleSpan);
246 249 path.arcTo(insideRect, -startAngle + 90 - angleSpan, angleSpan);
247 250 path.closeSubpath();
248 251 } else {
249 252 path.moveTo(rect.center());
250 253 path.arcTo(rect, -startAngle + 90, -angleSpan);
251 254 path.closeSubpath();
252 255 }
253 256
254 257 // calculate label arm start point
255 258 *armStart = center;
256 259 *armStart += offset(*centerAngle, radius + PIESLICE_LABEL_GAP);
257 260
258 261 return path;
259 262 }
260 263
261 264 QPainterPath PieSliceItem::labelArmPath(QPointF start, qreal angle, qreal length, qreal textWidth, QPointF *textStart)
262 265 {
263 266 // Normalize the angle to 0-360 range
264 267 // NOTE: We are using int here on purpose. Depenging on platform and hardware
265 268 // qreal can be a double, float or something the user gives to the Qt configure
266 269 // (QT_COORD_TYPE). Compilers do not seem to support modulo for double or float
267 270 // but there are fmod() and fmodf() functions for that. So instead of some #ifdef
268 271 // that might break we just use int. Precision for this is just fine for our needs.
269 272 int normalized = angle * 10.0;
270 273 normalized = normalized % 3600;
271 274 if (normalized < 0)
272 275 normalized += 3600;
273 276 angle = (qreal) normalized / 10.0;
274 277
275 278 // prevent label arm pointing straight down because it will look bad
276 279 if (angle < 180 && angle > 170)
277 280 angle = 170;
278 281 if (angle > 180 && angle < 190)
279 282 angle = 190;
280 283
281 284 // line from slice to label
282 285 QPointF parm1 = start + offset(angle, length);
283 286
284 287 // line to underline the label
285 288 QPointF parm2 = parm1;
286 289 if (angle < 180) { // arm swings the other way on the left side
287 290 parm2 += QPointF(textWidth, 0);
288 291 *textStart = parm1;
289 292 } else {
290 293 parm2 += QPointF(-textWidth, 0);
291 294 *textStart = parm2;
292 295 }
293 296
294 297 QPainterPath path;
295 298 path.moveTo(start);
296 299 path.lineTo(parm1);
297 300 path.lineTo(parm2);
298 301
299 302 return path;
300 303 }
301 304
302 305 #include "moc_piesliceitem_p.cpp"
303 306
304 307 QTCOMMERCIALCHART_END_NAMESPACE
305 308
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