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Fix pie slice label visibility...
Titta Heikkala -
r2655:5086492877e0
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1 /****************************************************************************
1 /****************************************************************************
2 **
2 **
3 ** Copyright (C) 2013 Digia Plc
3 ** Copyright (C) 2013 Digia Plc
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4 ** All rights reserved.
5 ** For any questions to Digia, please use contact form at http://qt.digia.com
5 ** For any questions to Digia, please use contact form at http://qt.digia.com
6 **
6 **
7 ** This file is part of the Qt Enterprise Charts Add-on.
7 ** This file is part of the Qt Enterprise Charts Add-on.
8 **
8 **
9 ** $QT_BEGIN_LICENSE$
9 ** $QT_BEGIN_LICENSE$
10 ** Licensees holding valid Qt Enterprise licenses may use this file in
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11 ** accordance with the Qt Enterprise License Agreement provided with the
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12 ** Software or, alternatively, in accordance with the terms contained in
13 ** a written agreement between you and Digia.
13 ** a written agreement between you and Digia.
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15 ** If you have questions regarding the use of this file, please use
15 ** If you have questions regarding the use of this file, please use
16 ** contact form at http://qt.digia.com
16 ** contact form at http://qt.digia.com
17 ** $QT_END_LICENSE$
17 ** $QT_END_LICENSE$
18 **
18 **
19 ****************************************************************************/
19 ****************************************************************************/
20
20
21 #include "piesliceitem_p.h"
21 #include "piesliceitem_p.h"
22 #include "piechartitem_p.h"
22 #include "piechartitem_p.h"
23 #include "qpieseries.h"
23 #include "qpieseries.h"
24 #include "qpieslice.h"
24 #include "qpieslice.h"
25 #include "chartpresenter_p.h"
25 #include "chartpresenter_p.h"
26 #include <QPainter>
26 #include <QPainter>
27 #include <qmath.h>
27 #include <qmath.h>
28 #include <QGraphicsSceneEvent>
28 #include <QGraphicsSceneEvent>
29 #include <QTime>
29 #include <QTime>
30 #include <QTextDocument>
30 #include <QTextDocument>
31 #include <QDebug>
31 #include <QDebug>
32
32
33 QTCOMMERCIALCHART_BEGIN_NAMESPACE
33 QTCOMMERCIALCHART_BEGIN_NAMESPACE
34
34
35 QPointF offset(qreal angle, qreal length)
35 QPointF offset(qreal angle, qreal length)
36 {
36 {
37 qreal dx = qSin(angle * (M_PI / 180)) * length;
37 qreal dx = qSin(angle * (M_PI / 180)) * length;
38 qreal dy = qCos(angle * (M_PI / 180)) * length;
38 qreal dy = qCos(angle * (M_PI / 180)) * length;
39 return QPointF(dx, -dy);
39 return QPointF(dx, -dy);
40 }
40 }
41
41
42 PieSliceItem::PieSliceItem(QGraphicsItem *parent)
42 PieSliceItem::PieSliceItem(QGraphicsItem *parent)
43 : QGraphicsObject(parent),
43 : QGraphicsObject(parent),
44 m_hovered(false)
44 m_hovered(false)
45 {
45 {
46 setAcceptHoverEvents(true);
46 setAcceptHoverEvents(true);
47 setAcceptedMouseButtons(Qt::MouseButtonMask);
47 setAcceptedMouseButtons(Qt::MouseButtonMask);
48 setZValue(ChartPresenter::PieSeriesZValue);
48 setZValue(ChartPresenter::PieSeriesZValue);
49 m_labelItem = new QGraphicsTextItem(this);
49 m_labelItem = new QGraphicsTextItem(this);
50 m_labelItem->document()->setDocumentMargin(1.0);
50 m_labelItem->document()->setDocumentMargin(1.0);
51 }
51 }
52
52
53 PieSliceItem::~PieSliceItem()
53 PieSliceItem::~PieSliceItem()
54 {
54 {
55 // If user is hovering over the slice and it gets destroyed we do
55 // If user is hovering over the slice and it gets destroyed we do
56 // not get a hover leave event. So we must emit the signal here.
56 // not get a hover leave event. So we must emit the signal here.
57 if (m_hovered)
57 if (m_hovered)
58 emit hovered(false);
58 emit hovered(false);
59 }
59 }
60
60
61 QRectF PieSliceItem::boundingRect() const
61 QRectF PieSliceItem::boundingRect() const
62 {
62 {
63 return m_boundingRect;
63 return m_boundingRect;
64 }
64 }
65
65
66 QPainterPath PieSliceItem::shape() const
66 QPainterPath PieSliceItem::shape() const
67 {
67 {
68 // Don't include the label and label arm.
68 // Don't include the label and label arm.
69 // This is used to detect a mouse clicks. We do not want clicks from label.
69 // This is used to detect a mouse clicks. We do not want clicks from label.
70 return m_slicePath;
70 return m_slicePath;
71 }
71 }
72
72
73 void PieSliceItem::paint(QPainter *painter, const QStyleOptionGraphicsItem * /*option*/, QWidget * /*widget*/)
73 void PieSliceItem::paint(QPainter *painter, const QStyleOptionGraphicsItem * /*option*/, QWidget * /*widget*/)
74 {
74 {
75 painter->save();
75 painter->save();
76 painter->setClipRect(parentItem()->boundingRect());
76 painter->setClipRect(parentItem()->boundingRect());
77 painter->setPen(m_data.m_slicePen);
77 painter->setPen(m_data.m_slicePen);
78 painter->setBrush(m_data.m_sliceBrush);
78 painter->setBrush(m_data.m_sliceBrush);
79 painter->drawPath(m_slicePath);
79 painter->drawPath(m_slicePath);
80 painter->restore();
80 painter->restore();
81
81
82 if (m_data.m_isLabelVisible) {
82 if (m_data.m_isLabelVisible) {
83 painter->save();
83 painter->save();
84
84
85 // Pen for label arm not defined in the QPieSeries api, let's use brush's color instead
85 // Pen for label arm not defined in the QPieSeries api, let's use brush's color instead
86 painter->setBrush(m_data.m_labelBrush);
86 painter->setBrush(m_data.m_labelBrush);
87
87
88 if (m_data.m_labelPosition == QPieSlice::LabelOutside) {
88 if (m_data.m_labelPosition == QPieSlice::LabelOutside) {
89 painter->setClipRect(parentItem()->boundingRect());
89 painter->setClipRect(parentItem()->boundingRect());
90 painter->strokePath(m_labelArmPath, m_data.m_labelBrush.color());
90 painter->strokePath(m_labelArmPath, m_data.m_labelBrush.color());
91 }
91 }
92
92
93 painter->restore();
93 painter->restore();
94 }
94 }
95 }
95 }
96
96
97 void PieSliceItem::hoverEnterEvent(QGraphicsSceneHoverEvent * /*event*/)
97 void PieSliceItem::hoverEnterEvent(QGraphicsSceneHoverEvent * /*event*/)
98 {
98 {
99 m_hovered = true;
99 m_hovered = true;
100 emit hovered(true);
100 emit hovered(true);
101 }
101 }
102
102
103 void PieSliceItem::hoverLeaveEvent(QGraphicsSceneHoverEvent * /*event*/)
103 void PieSliceItem::hoverLeaveEvent(QGraphicsSceneHoverEvent * /*event*/)
104 {
104 {
105 m_hovered = false;
105 m_hovered = false;
106 emit hovered(false);
106 emit hovered(false);
107 }
107 }
108
108
109 void PieSliceItem::mousePressEvent(QGraphicsSceneMouseEvent *event)
109 void PieSliceItem::mousePressEvent(QGraphicsSceneMouseEvent *event)
110 {
110 {
111 emit clicked(event->buttons());
111 emit clicked(event->buttons());
112 QGraphicsItem::mousePressEvent(event);
112 QGraphicsItem::mousePressEvent(event);
113 }
113 }
114
114
115 void PieSliceItem::setLayout(const PieSliceData &sliceData)
115 void PieSliceItem::setLayout(const PieSliceData &sliceData)
116 {
116 {
117 m_data = sliceData;
117 m_data = sliceData;
118 updateGeometry();
118 updateGeometry();
119 update();
119 update();
120 }
120 }
121
121
122 void PieSliceItem::updateGeometry()
122 void PieSliceItem::updateGeometry()
123 {
123 {
124 if (m_data.m_radius <= 0)
124 if (m_data.m_radius <= 0)
125 return;
125 return;
126
126
127 prepareGeometryChange();
127 prepareGeometryChange();
128
128
129 // slice path
129 // slice path
130 qreal centerAngle;
130 qreal centerAngle;
131 QPointF armStart;
131 QPointF armStart;
132 m_slicePath = slicePath(m_data.m_center, m_data.m_radius, m_data.m_startAngle, m_data.m_angleSpan, &centerAngle, &armStart);
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);
134 m_labelItem->setVisible(m_data.m_isLabelVisible);
135
135
136 if (m_data.m_isLabelVisible) {
136 if (m_data.m_isLabelVisible) {
137 // text rect
137 // text rect
138 m_labelTextRect = ChartPresenter::textBoundingRect(m_data.m_labelFont,
138 m_labelTextRect = ChartPresenter::textBoundingRect(m_data.m_labelFont,
139 m_data.m_labelText,
139 m_data.m_labelText,
140 0);
140 0);
141
141
142 QString label(m_data.m_labelText);
142 QString label(m_data.m_labelText);
143 m_labelItem->setDefaultTextColor(m_data.m_labelBrush.color());
143 m_labelItem->setDefaultTextColor(m_data.m_labelBrush.color());
144 m_labelItem->setFont(m_data.m_labelFont);
144 m_labelItem->setFont(m_data.m_labelFont);
145
145
146 // text position
146 // text position
147 if (m_data.m_labelPosition == QPieSlice::LabelOutside) {
147 if (m_data.m_labelPosition == QPieSlice::LabelOutside) {
148 setFlag(QGraphicsItem::ItemClipsChildrenToShape, false);
148 setFlag(QGraphicsItem::ItemClipsChildrenToShape, false);
149
149
150 // label arm path
150 // label arm path
151 QPointF labelTextStart;
151 QPointF labelTextStart;
152 m_labelArmPath = labelArmPath(armStart, centerAngle,
152 m_labelArmPath = labelArmPath(armStart, centerAngle,
153 m_data.m_radius * m_data.m_labelArmLengthFactor,
153 m_data.m_radius * m_data.m_labelArmLengthFactor,
154 m_labelTextRect.width(), &labelTextStart);
154 m_labelTextRect.width(), &labelTextStart);
155
155
156 m_labelTextRect.moveBottomLeft(labelTextStart);
156 m_labelTextRect.moveBottomLeft(labelTextStart);
157 if (m_labelTextRect.left() < 0)
157 if (m_labelTextRect.left() < 0)
158 m_labelTextRect.setLeft(0);
158 m_labelTextRect.setLeft(0);
159 else if (m_labelTextRect.left() < parentItem()->boundingRect().left())
159 else if (m_labelTextRect.left() < parentItem()->boundingRect().left())
160 m_labelTextRect.setLeft(parentItem()->boundingRect().left());
160 m_labelTextRect.setLeft(parentItem()->boundingRect().left());
161 if (m_labelTextRect.right() > parentItem()->boundingRect().right())
161 if (m_labelTextRect.right() > parentItem()->boundingRect().right())
162 m_labelTextRect.setRight(parentItem()->boundingRect().right());
162 m_labelTextRect.setRight(parentItem()->boundingRect().right());
163
163
164 label = ChartPresenter::truncatedText(m_data.m_labelFont, m_data.m_labelText,
164 label = ChartPresenter::truncatedText(m_data.m_labelFont, m_data.m_labelText,
165 qreal(0.0), m_labelTextRect.width(),
165 qreal(0.0), m_labelTextRect.width(),
166 m_labelTextRect.height(), m_labelTextRect);
166 m_labelTextRect.height(), m_labelTextRect);
167 m_labelArmPath = labelArmPath(armStart, centerAngle,
167 m_labelArmPath = labelArmPath(armStart, centerAngle,
168 m_data.m_radius * m_data.m_labelArmLengthFactor,
168 m_data.m_radius * m_data.m_labelArmLengthFactor,
169 m_labelTextRect.width(), &labelTextStart);
169 m_labelTextRect.width(), &labelTextStart);
170 m_labelTextRect.moveBottomLeft(labelTextStart);
170 m_labelTextRect.moveBottomLeft(labelTextStart);
171
171
172 m_labelItem->setTextWidth(m_labelTextRect.width()
172 m_labelItem->setTextWidth(m_labelTextRect.width()
173 + m_labelItem->document()->documentMargin());
173 + m_labelItem->document()->documentMargin());
174 m_labelItem->setHtml(label);
174 m_labelItem->setHtml(label);
175 m_labelItem->setRotation(0);
175 m_labelItem->setRotation(0);
176 m_labelItem->setPos(m_labelTextRect.x(), m_labelTextRect.y() + 1.0);
176 m_labelItem->setPos(m_labelTextRect.x(), m_labelTextRect.y() + 1.0);
177 } else {
177 } else {
178 // label inside
178 // label inside
179 setFlag(QGraphicsItem::ItemClipsChildrenToShape);
179 setFlag(QGraphicsItem::ItemClipsChildrenToShape);
180 m_labelItem->setTextWidth(m_labelTextRect.width()
180 m_labelItem->setTextWidth(m_labelTextRect.width()
181 + m_labelItem->document()->documentMargin());
181 + m_labelItem->document()->documentMargin());
182 m_labelItem->setHtml(label);
182 m_labelItem->setHtml(label);
183
183
184 QPointF textCenter;
184 QPointF textCenter;
185 if (m_data.m_holeRadius > 0) {
185 if (m_data.m_holeRadius > 0) {
186 textCenter = m_data.m_center + offset(centerAngle, m_data.m_holeRadius
186 textCenter = m_data.m_center + offset(centerAngle, m_data.m_holeRadius
187 + (m_data.m_radius
187 + (m_data.m_radius
188 - m_data.m_holeRadius) / 2);
188 - m_data.m_holeRadius) / 2);
189 } else {
189 } else {
190 textCenter = m_data.m_center + offset(centerAngle, m_data.m_radius / 2);
190 textCenter = m_data.m_center + offset(centerAngle, m_data.m_radius / 2);
191 }
191 }
192 m_labelItem->setPos(textCenter.x() - m_labelItem->boundingRect().width() / 2,
192 m_labelItem->setPos(textCenter.x() - m_labelItem->boundingRect().width() / 2,
193 textCenter.y() - m_labelTextRect.height() / 2);
193 textCenter.y() - m_labelTextRect.height() / 2);
194
194
195 QPointF labelCenter = m_labelItem->boundingRect().center();
195 QPointF labelCenter = m_labelItem->boundingRect().center();
196 m_labelItem->setTransformOriginPoint(labelCenter);
196 m_labelItem->setTransformOriginPoint(labelCenter);
197
197
198 if (m_data.m_labelPosition == QPieSlice::LabelInsideTangential) {
198 if (m_data.m_labelPosition == QPieSlice::LabelInsideTangential) {
199 m_labelItem->setRotation(m_data.m_startAngle + m_data.m_angleSpan / 2);
199 m_labelItem->setRotation(m_data.m_startAngle + m_data.m_angleSpan / 2);
200 } else if (m_data.m_labelPosition == QPieSlice::LabelInsideNormal) {
200 } else if (m_data.m_labelPosition == QPieSlice::LabelInsideNormal) {
201 if (m_data.m_startAngle + m_data.m_angleSpan / 2 < 180)
201 if (m_data.m_startAngle + m_data.m_angleSpan / 2 < 180)
202 m_labelItem->setRotation(m_data.m_startAngle + m_data.m_angleSpan / 2 - 90);
202 m_labelItem->setRotation(m_data.m_startAngle + m_data.m_angleSpan / 2 - 90);
203 else
203 else
204 m_labelItem->setRotation(m_data.m_startAngle + m_data.m_angleSpan / 2 + 90);
204 m_labelItem->setRotation(m_data.m_startAngle + m_data.m_angleSpan / 2 + 90);
205 } else {
205 } else {
206 m_labelItem->setRotation(0);
206 m_labelItem->setRotation(0);
207 }
207 }
208 }
208 }
209 // Hide label if it's outside the bounding rect of parent item
210 QRectF labelRect(m_labelItem->boundingRect());
211 labelRect.moveTopLeft(m_labelItem->pos());
212 if (parentItem()->boundingRect().contains(labelRect))
213 m_labelItem->show();
214 else
215 m_labelItem->hide();
209 }
216 }
210
217
211 // bounding rect
218 // bounding rect
212 if (m_data.m_isLabelVisible)
219 if (m_data.m_isLabelVisible)
213 m_boundingRect = m_slicePath.boundingRect().united(m_labelArmPath.boundingRect()).united(m_labelTextRect);
220 m_boundingRect = m_slicePath.boundingRect().united(m_labelArmPath.boundingRect()).united(m_labelTextRect);
214 else
221 else
215 m_boundingRect = m_slicePath.boundingRect();
222 m_boundingRect = m_slicePath.boundingRect();
216
223
217 // Inflate bounding rect by 2/3 pen width to make sure it encompasses whole slice also for thick pens
224 // Inflate bounding rect by 2/3 pen width to make sure it encompasses whole slice also for thick pens
218 // and miter joins.
225 // and miter joins.
219 int penWidth = (m_data.m_slicePen.width() * 2) / 3;
226 int penWidth = (m_data.m_slicePen.width() * 2) / 3;
220 m_boundingRect = m_boundingRect.adjusted(-penWidth, -penWidth, penWidth, penWidth);
227 m_boundingRect = m_boundingRect.adjusted(-penWidth, -penWidth, penWidth, penWidth);
221 }
228 }
222
229
223 QPointF PieSliceItem::sliceCenter(QPointF point, qreal radius, QPieSlice *slice)
230 QPointF PieSliceItem::sliceCenter(QPointF point, qreal radius, QPieSlice *slice)
224 {
231 {
225 if (slice->isExploded()) {
232 if (slice->isExploded()) {
226 qreal centerAngle = slice->startAngle() + (slice->angleSpan() / 2);
233 qreal centerAngle = slice->startAngle() + (slice->angleSpan() / 2);
227 qreal len = radius * slice->explodeDistanceFactor();
234 qreal len = radius * slice->explodeDistanceFactor();
228 point += offset(centerAngle, len);
235 point += offset(centerAngle, len);
229 }
236 }
230 return point;
237 return point;
231 }
238 }
232
239
233 QPainterPath PieSliceItem::slicePath(QPointF center, qreal radius, qreal startAngle, qreal angleSpan, qreal *centerAngle, QPointF *armStart)
240 QPainterPath PieSliceItem::slicePath(QPointF center, qreal radius, qreal startAngle, qreal angleSpan, qreal *centerAngle, QPointF *armStart)
234 {
241 {
235 // calculate center angle
242 // calculate center angle
236 *centerAngle = startAngle + (angleSpan / 2);
243 *centerAngle = startAngle + (angleSpan / 2);
237
244
238 // calculate slice rectangle
245 // calculate slice rectangle
239 QRectF rect(center.x() - radius, center.y() - radius, radius * 2, radius * 2);
246 QRectF rect(center.x() - radius, center.y() - radius, radius * 2, radius * 2);
240
247
241 // slice path
248 // slice path
242 QPainterPath path;
249 QPainterPath path;
243 if (m_data.m_holeRadius > 0) {
250 if (m_data.m_holeRadius > 0) {
244 QRectF insideRect(center.x() - m_data.m_holeRadius, center.y() - m_data.m_holeRadius, m_data.m_holeRadius * 2, m_data.m_holeRadius * 2);
251 QRectF insideRect(center.x() - m_data.m_holeRadius, center.y() - m_data.m_holeRadius, m_data.m_holeRadius * 2, m_data.m_holeRadius * 2);
245 path.arcMoveTo(rect, -startAngle + 90);
252 path.arcMoveTo(rect, -startAngle + 90);
246 path.arcTo(rect, -startAngle + 90, -angleSpan);
253 path.arcTo(rect, -startAngle + 90, -angleSpan);
247 path.arcTo(insideRect, -startAngle + 90 - angleSpan, angleSpan);
254 path.arcTo(insideRect, -startAngle + 90 - angleSpan, angleSpan);
248 path.closeSubpath();
255 path.closeSubpath();
249 } else {
256 } else {
250 path.moveTo(rect.center());
257 path.moveTo(rect.center());
251 path.arcTo(rect, -startAngle + 90, -angleSpan);
258 path.arcTo(rect, -startAngle + 90, -angleSpan);
252 path.closeSubpath();
259 path.closeSubpath();
253 }
260 }
254
261
255 // calculate label arm start point
262 // calculate label arm start point
256 *armStart = center;
263 *armStart = center;
257 *armStart += offset(*centerAngle, radius + PIESLICE_LABEL_GAP);
264 *armStart += offset(*centerAngle, radius + PIESLICE_LABEL_GAP);
258
265
259 return path;
266 return path;
260 }
267 }
261
268
262 QPainterPath PieSliceItem::labelArmPath(QPointF start, qreal angle, qreal length, qreal textWidth, QPointF *textStart)
269 QPainterPath PieSliceItem::labelArmPath(QPointF start, qreal angle, qreal length, qreal textWidth, QPointF *textStart)
263 {
270 {
264 // Normalize the angle to 0-360 range
271 // Normalize the angle to 0-360 range
265 // NOTE: We are using int here on purpose. Depenging on platform and hardware
272 // NOTE: We are using int here on purpose. Depenging on platform and hardware
266 // qreal can be a double, float or something the user gives to the Qt configure
273 // qreal can be a double, float or something the user gives to the Qt configure
267 // (QT_COORD_TYPE). Compilers do not seem to support modulo for double or float
274 // (QT_COORD_TYPE). Compilers do not seem to support modulo for double or float
268 // but there are fmod() and fmodf() functions for that. So instead of some #ifdef
275 // but there are fmod() and fmodf() functions for that. So instead of some #ifdef
269 // that might break we just use int. Precision for this is just fine for our needs.
276 // that might break we just use int. Precision for this is just fine for our needs.
270 int normalized = angle * 10.0;
277 int normalized = angle * 10.0;
271 normalized = normalized % 3600;
278 normalized = normalized % 3600;
272 if (normalized < 0)
279 if (normalized < 0)
273 normalized += 3600;
280 normalized += 3600;
274 angle = (qreal) normalized / 10.0;
281 angle = (qreal) normalized / 10.0;
275
282
276 // prevent label arm pointing straight down because it will look bad
283 // prevent label arm pointing straight down because it will look bad
277 if (angle < 180 && angle > 170)
284 if (angle < 180 && angle > 170)
278 angle = 170;
285 angle = 170;
279 if (angle > 180 && angle < 190)
286 if (angle > 180 && angle < 190)
280 angle = 190;
287 angle = 190;
281
288
282 // line from slice to label
289 // line from slice to label
283 QPointF parm1 = start + offset(angle, length);
290 QPointF parm1 = start + offset(angle, length);
284
291
285 // line to underline the label
292 // line to underline the label
286 QPointF parm2 = parm1;
293 QPointF parm2 = parm1;
287 if (angle < 180) { // arm swings the other way on the left side
294 if (angle < 180) { // arm swings the other way on the left side
288 parm2 += QPointF(textWidth, 0);
295 parm2 += QPointF(textWidth, 0);
289 *textStart = parm1;
296 *textStart = parm1;
290 } else {
297 } else {
291 parm2 += QPointF(-textWidth, 0);
298 parm2 += QPointF(-textWidth, 0);
292 *textStart = parm2;
299 *textStart = parm2;
293 }
300 }
294
301
295 QPainterPath path;
302 QPainterPath path;
296 path.moveTo(start);
303 path.moveTo(start);
297 path.lineTo(parm1);
304 path.lineTo(parm1);
298 path.lineTo(parm2);
305 path.lineTo(parm2);
299
306
300 return path;
307 return path;
301 }
308 }
302
309
303 #include "moc_piesliceitem_p.cpp"
310 #include "moc_piesliceitem_p.cpp"
304
311
305 QTCOMMERCIALCHART_END_NAMESPACE
312 QTCOMMERCIALCHART_END_NAMESPACE
306
313
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