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Clone from http://code.qt.io/qt/qtcharts.git

Prevent slice label pointing straight down (because it looks bad).
Jani Honkonen -
r972:23d12d63b029
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@@ -145,7 +145,7 QPointF PieSliceItem::sliceCenter(QPointF point, qreal radius, QPieSlice *slice)
145 145 return point;
146 146 }
147 147
148 QPainterPath PieSliceItem::slicePath(QPointF center, qreal radius, qreal startAngle, qreal angleSpan, qreal* centerAngle, QPointF* armStart)
148 QPainterPath PieSliceItem::slicePath(QPointF center, qreal radius, qreal startAngle, qreal angleSpan, qreal *centerAngle, QPointF* armStart)
149 149 {
150 150 // calculate center angle
151 151 *centerAngle = startAngle + (angleSpan/2);
@@ -167,12 +167,20 QPainterPath PieSliceItem::slicePath(QPointF center, qreal radius, qreal startAn
167 167 return path;
168 168 }
169 169
170 QPainterPath PieSliceItem::labelArmPath(QPointF start, qreal angle, qreal length, qreal textWidth, QPointF* textStart)
170 QPainterPath PieSliceItem::labelArmPath(QPointF start, qreal angle, qreal length, qreal textWidth, QPointF *textStart)
171 171 {
172 // prevent label arm pointing straight down because it will look bad
173 if (angle < 180 && angle > 170)
174 angle = 170;
175 if (angle > 180 && angle < 190)
176 angle = 190;
177
178 // line from slice to label
172 179 qreal dx = qSin(angle*(PI/180)) * length;
173 180 qreal dy = -qCos(angle*(PI/180)) * length;
174 181 QPointF parm1 = start + QPointF(dx, dy);
175 182
183 // line to underline the label
176 184 QPointF parm2 = parm1;
177 185 if (angle < 180) { // arm swings the other way on the left side
178 186 parm2 += QPointF(textWidth, 0);
@@ -184,7 +192,7 QPainterPath PieSliceItem::labelArmPath(QPointF start, qreal angle, qreal length
184 192 }
185 193
186 194 // elevate the text position a bit so that it does not hit the line
187 *textStart += QPointF(0, -5);
195 *textStart += QPointF(0, -3);
188 196
189 197 QPainterPath path;
190 198 path.moveTo(start);
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@@ -62,9 +62,9 public:
62 62 void setSliceData(PieSliceData sliceData);
63 63 void updateGeometry();
64 64 static QPointF sliceCenter(QPointF point, qreal radius, QPieSlice *slice);
65 static QPainterPath slicePath(QPointF center, qreal radius, qreal startAngle, qreal angleSpan, qreal* centerAngle, QPointF* armStart);
66 static QPainterPath labelArmPath(QPointF start, qreal angle, qreal length, qreal textWidth, QPointF* textStart);
67 static QRectF labelTextRect(QFont font, QString text);
65 QPainterPath slicePath(QPointF center, qreal radius, qreal startAngle, qreal angleSpan, qreal *centerAngle, QPointF *armStart);
66 QPainterPath labelArmPath(QPointF start, qreal angle, qreal length, qreal textWidth, QPointF *textStart);
67 QRectF labelTextRect(QFont font, QString text);
68 68
69 69 private:
70 70 PieSliceData m_data;
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