##// END OF EJS Templates
Fix pie slice label visibility and position on change...
Titta Heikkala -
r2628:c23615f6e192
parent child
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@@ -1,305 +1,308
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 **
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9 ** $QT_BEGIN_LICENSE$
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11 ** accordance with the Qt Enterprise License Agreement provided with the
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13 ** a written agreement between you and Digia.
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17 ** $QT_END_LICENSE$
17 ** $QT_END_LICENSE$
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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);
135
134 if (m_data.m_isLabelVisible) {
136 if (m_data.m_isLabelVisible) {
135 // text rect
137 // text rect
136 QFontMetricsF fm(m_data.m_labelFont);
138 QFontMetricsF fm(m_data.m_labelFont);
137 m_labelTextRect = ChartPresenter::textBoundingRect(m_data.m_labelFont,
139 m_labelTextRect = ChartPresenter::textBoundingRect(m_data.m_labelFont,
138 m_data.m_labelText,
140 m_data.m_labelText,
139 0);
141 0);
140
142
141 QString label(m_data.m_labelText);
143 QString label(m_data.m_labelText);
142 m_labelItem->setVisible(m_data.m_isLabelVisible);
143 m_labelItem->setDefaultTextColor(m_data.m_labelBrush.color());
144 m_labelItem->setDefaultTextColor(m_data.m_labelBrush.color());
144 m_labelItem->setFont(m_data.m_labelFont);
145 m_labelItem->setFont(m_data.m_labelFont);
145
146
146 // text position
147 // text position
147 if (m_data.m_labelPosition == QPieSlice::LabelOutside) {
148 if (m_data.m_labelPosition == QPieSlice::LabelOutside) {
148 setFlag(QGraphicsItem::ItemClipsChildrenToShape, false);
149 setFlag(QGraphicsItem::ItemClipsChildrenToShape, false);
149
150
150 // label arm path
151 // label arm path
151 QPointF labelTextStart;
152 QPointF labelTextStart;
152 m_labelArmPath = labelArmPath(armStart, centerAngle,
153 m_labelArmPath = labelArmPath(armStart, centerAngle,
153 m_data.m_radius * m_data.m_labelArmLengthFactor,
154 m_data.m_radius * m_data.m_labelArmLengthFactor,
154 m_labelTextRect.width(), &labelTextStart);
155 m_labelTextRect.width(), &labelTextStart);
155
156
156 m_labelTextRect.moveBottomLeft(labelTextStart);
157 m_labelTextRect.moveBottomLeft(labelTextStart);
157 if (m_labelTextRect.left() < 0)
158 if (m_labelTextRect.left() < 0)
158 m_labelTextRect.setLeft(0);
159 m_labelTextRect.setLeft(0);
159 else if (m_labelTextRect.left() < parentItem()->boundingRect().left())
160 else if (m_labelTextRect.left() < parentItem()->boundingRect().left())
160 m_labelTextRect.setLeft(parentItem()->boundingRect().left());
161 m_labelTextRect.setLeft(parentItem()->boundingRect().left());
161 if (m_labelTextRect.right() > parentItem()->boundingRect().right())
162 if (m_labelTextRect.right() > parentItem()->boundingRect().right())
162 m_labelTextRect.setRight(parentItem()->boundingRect().right());
163 m_labelTextRect.setRight(parentItem()->boundingRect().right());
163
164
164 if (fm.width(m_data.m_labelText) > m_labelTextRect.width()) {
165 if (fm.width(m_data.m_labelText) > m_labelTextRect.width()) {
165 label = ChartPresenter::truncatedText(m_data.m_labelFont, m_data.m_labelText,
166 label = ChartPresenter::truncatedText(m_data.m_labelFont, m_data.m_labelText,
166 qreal(0.0), m_labelTextRect.width(),
167 qreal(0.0), m_labelTextRect.width(),
167 m_labelTextRect.height(), m_labelTextRect);
168 m_labelTextRect.height(), m_labelTextRect);
168 m_labelArmPath = labelArmPath(armStart, centerAngle,
169 m_labelArmPath = labelArmPath(armStart, centerAngle,
169 m_data.m_radius * m_data.m_labelArmLengthFactor,
170 m_data.m_radius * m_data.m_labelArmLengthFactor,
170 m_labelTextRect.width(), &labelTextStart);
171 m_labelTextRect.width(), &labelTextStart);
171
172
172 m_labelTextRect.moveBottomLeft(labelTextStart);
173 m_labelTextRect.moveBottomLeft(labelTextStart);
173 }
174 }
174 m_labelItem->setTextWidth(m_labelTextRect.width()
175 m_labelItem->setTextWidth(m_labelTextRect.width()
175 + m_labelItem->document()->documentMargin());
176 + m_labelItem->document()->documentMargin());
176 m_labelItem->setHtml(label);
177 m_labelItem->setHtml(label);
177 m_labelItem->setPos(m_labelTextRect.x(), m_labelTextRect.y() + 1.0);
178 m_labelItem->setPos(m_labelTextRect.x(), m_labelTextRect.y() + 1.0);
178 } else {
179 } else {
179 // label inside
180 // label inside
180 setFlag(QGraphicsItem::ItemClipsChildrenToShape);
181 setFlag(QGraphicsItem::ItemClipsChildrenToShape);
181 m_labelItem->setTextWidth(m_labelTextRect.width()
182 m_labelItem->setTextWidth(m_labelTextRect.width()
182 + m_labelItem->document()->documentMargin());
183 + m_labelItem->document()->documentMargin());
183 m_labelItem->setHtml(label);
184 m_labelItem->setHtml(label);
184
185
185 QPointF textCenter;
186 QPointF textCenter;
186 if (m_data.m_holeRadius > 0) {
187 if (m_data.m_holeRadius > 0) {
187 textCenter = m_data.m_center + offset(centerAngle, m_data.m_holeRadius
188 textCenter = m_data.m_center + offset(centerAngle, m_data.m_holeRadius
188 + (m_data.m_radius
189 + (m_data.m_radius
189 - m_data.m_holeRadius) / 2);
190 - m_data.m_holeRadius) / 2);
190 } else {
191 } else {
191 textCenter = m_data.m_center + offset(centerAngle, m_data.m_radius / 2);
192 textCenter = m_data.m_center + offset(centerAngle, m_data.m_radius / 2);
192 }
193 }
193 m_labelItem->setPos(textCenter.x() - m_labelItem->boundingRect().width() / 2,
194 m_labelItem->setPos(textCenter.x() - m_labelItem->boundingRect().width() / 2,
194 textCenter.y() - fm.height() / 2);
195 textCenter.y() - fm.height() / 2);
195
196
196 QPointF labelCenter = m_labelItem->boundingRect().center();
197 QPointF labelCenter = m_labelItem->boundingRect().center();
197 m_labelItem->setTransformOriginPoint(labelCenter);
198 m_labelItem->setTransformOriginPoint(labelCenter);
198
199
199 if (m_data.m_labelPosition == QPieSlice::LabelInsideTangential) {
200 if (m_data.m_labelPosition == QPieSlice::LabelInsideTangential) {
200 m_labelItem->setRotation(m_data.m_startAngle + m_data.m_angleSpan / 2);
201 m_labelItem->setRotation(m_data.m_startAngle + m_data.m_angleSpan / 2);
201 } else if (m_data.m_labelPosition == QPieSlice::LabelInsideNormal) {
202 } else if (m_data.m_labelPosition == QPieSlice::LabelInsideNormal) {
202 if (m_data.m_startAngle + m_data.m_angleSpan / 2 < 180)
203 if (m_data.m_startAngle + m_data.m_angleSpan / 2 < 180)
203 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);
204 else
205 else
205 m_labelItem->setRotation(m_data.m_startAngle + m_data.m_angleSpan / 2 + 90);
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 // bounding rect
213 // bounding rect
211 if (m_data.m_isLabelVisible)
214 if (m_data.m_isLabelVisible)
212 m_boundingRect = m_slicePath.boundingRect().united(m_labelArmPath.boundingRect()).united(m_labelTextRect);
215 m_boundingRect = m_slicePath.boundingRect().united(m_labelArmPath.boundingRect()).united(m_labelTextRect);
213 else
216 else
214 m_boundingRect = m_slicePath.boundingRect();
217 m_boundingRect = m_slicePath.boundingRect();
215
218
216 // Inflate bounding rect by 2/3 pen width to make sure it encompasses whole slice also for thick pens
219 // Inflate bounding rect by 2/3 pen width to make sure it encompasses whole slice also for thick pens
217 // and miter joins.
220 // and miter joins.
218 int penWidth = (m_data.m_slicePen.width() * 2) / 3;
221 int penWidth = (m_data.m_slicePen.width() * 2) / 3;
219 m_boundingRect = m_boundingRect.adjusted(-penWidth, -penWidth, penWidth, penWidth);
222 m_boundingRect = m_boundingRect.adjusted(-penWidth, -penWidth, penWidth, penWidth);
220 }
223 }
221
224
222 QPointF PieSliceItem::sliceCenter(QPointF point, qreal radius, QPieSlice *slice)
225 QPointF PieSliceItem::sliceCenter(QPointF point, qreal radius, QPieSlice *slice)
223 {
226 {
224 if (slice->isExploded()) {
227 if (slice->isExploded()) {
225 qreal centerAngle = slice->startAngle() + (slice->angleSpan() / 2);
228 qreal centerAngle = slice->startAngle() + (slice->angleSpan() / 2);
226 qreal len = radius * slice->explodeDistanceFactor();
229 qreal len = radius * slice->explodeDistanceFactor();
227 point += offset(centerAngle, len);
230 point += offset(centerAngle, len);
228 }
231 }
229 return point;
232 return point;
230 }
233 }
231
234
232 QPainterPath PieSliceItem::slicePath(QPointF center, qreal radius, qreal startAngle, qreal angleSpan, qreal *centerAngle, QPointF *armStart)
235 QPainterPath PieSliceItem::slicePath(QPointF center, qreal radius, qreal startAngle, qreal angleSpan, qreal *centerAngle, QPointF *armStart)
233 {
236 {
234 // calculate center angle
237 // calculate center angle
235 *centerAngle = startAngle + (angleSpan / 2);
238 *centerAngle = startAngle + (angleSpan / 2);
236
239
237 // calculate slice rectangle
240 // calculate slice rectangle
238 QRectF rect(center.x() - radius, center.y() - radius, radius * 2, radius * 2);
241 QRectF rect(center.x() - radius, center.y() - radius, radius * 2, radius * 2);
239
242
240 // slice path
243 // slice path
241 QPainterPath path;
244 QPainterPath path;
242 if (m_data.m_holeRadius > 0) {
245 if (m_data.m_holeRadius > 0) {
243 QRectF insideRect(center.x() - m_data.m_holeRadius, center.y() - m_data.m_holeRadius, m_data.m_holeRadius * 2, m_data.m_holeRadius * 2);
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 path.arcMoveTo(rect, -startAngle + 90);
247 path.arcMoveTo(rect, -startAngle + 90);
245 path.arcTo(rect, -startAngle + 90, -angleSpan);
248 path.arcTo(rect, -startAngle + 90, -angleSpan);
246 path.arcTo(insideRect, -startAngle + 90 - angleSpan, angleSpan);
249 path.arcTo(insideRect, -startAngle + 90 - angleSpan, angleSpan);
247 path.closeSubpath();
250 path.closeSubpath();
248 } else {
251 } else {
249 path.moveTo(rect.center());
252 path.moveTo(rect.center());
250 path.arcTo(rect, -startAngle + 90, -angleSpan);
253 path.arcTo(rect, -startAngle + 90, -angleSpan);
251 path.closeSubpath();
254 path.closeSubpath();
252 }
255 }
253
256
254 // calculate label arm start point
257 // calculate label arm start point
255 *armStart = center;
258 *armStart = center;
256 *armStart += offset(*centerAngle, radius + PIESLICE_LABEL_GAP);
259 *armStart += offset(*centerAngle, radius + PIESLICE_LABEL_GAP);
257
260
258 return path;
261 return path;
259 }
262 }
260
263
261 QPainterPath PieSliceItem::labelArmPath(QPointF start, qreal angle, qreal length, qreal textWidth, QPointF *textStart)
264 QPainterPath PieSliceItem::labelArmPath(QPointF start, qreal angle, qreal length, qreal textWidth, QPointF *textStart)
262 {
265 {
263 // Normalize the angle to 0-360 range
266 // Normalize the angle to 0-360 range
264 // NOTE: We are using int here on purpose. Depenging on platform and hardware
267 // NOTE: We are using int here on purpose. Depenging on platform and hardware
265 // qreal can be a double, float or something the user gives to the Qt configure
268 // qreal can be a double, float or something the user gives to the Qt configure
266 // (QT_COORD_TYPE). Compilers do not seem to support modulo for double or float
269 // (QT_COORD_TYPE). Compilers do not seem to support modulo for double or float
267 // but there are fmod() and fmodf() functions for that. So instead of some #ifdef
270 // but there are fmod() and fmodf() functions for that. So instead of some #ifdef
268 // that might break we just use int. Precision for this is just fine for our needs.
271 // that might break we just use int. Precision for this is just fine for our needs.
269 int normalized = angle * 10.0;
272 int normalized = angle * 10.0;
270 normalized = normalized % 3600;
273 normalized = normalized % 3600;
271 if (normalized < 0)
274 if (normalized < 0)
272 normalized += 3600;
275 normalized += 3600;
273 angle = (qreal) normalized / 10.0;
276 angle = (qreal) normalized / 10.0;
274
277
275 // prevent label arm pointing straight down because it will look bad
278 // prevent label arm pointing straight down because it will look bad
276 if (angle < 180 && angle > 170)
279 if (angle < 180 && angle > 170)
277 angle = 170;
280 angle = 170;
278 if (angle > 180 && angle < 190)
281 if (angle > 180 && angle < 190)
279 angle = 190;
282 angle = 190;
280
283
281 // line from slice to label
284 // line from slice to label
282 QPointF parm1 = start + offset(angle, length);
285 QPointF parm1 = start + offset(angle, length);
283
286
284 // line to underline the label
287 // line to underline the label
285 QPointF parm2 = parm1;
288 QPointF parm2 = parm1;
286 if (angle < 180) { // arm swings the other way on the left side
289 if (angle < 180) { // arm swings the other way on the left side
287 parm2 += QPointF(textWidth, 0);
290 parm2 += QPointF(textWidth, 0);
288 *textStart = parm1;
291 *textStart = parm1;
289 } else {
292 } else {
290 parm2 += QPointF(-textWidth, 0);
293 parm2 += QPointF(-textWidth, 0);
291 *textStart = parm2;
294 *textStart = parm2;
292 }
295 }
293
296
294 QPainterPath path;
297 QPainterPath path;
295 path.moveTo(start);
298 path.moveTo(start);
296 path.lineTo(parm1);
299 path.lineTo(parm1);
297 path.lineTo(parm2);
300 path.lineTo(parm2);
298
301
299 return path;
302 return path;
300 }
303 }
301
304
302 #include "moc_piesliceitem_p.cpp"
305 #include "moc_piesliceitem_p.cpp"
303
306
304 QTCOMMERCIALCHART_END_NAMESPACE
307 QTCOMMERCIALCHART_END_NAMESPACE
305
308
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