| 179 | } |
| 180 | |
| 181 | QPolygonF UBGeometryUtils::arcToPolygon(const QLineF& startRadius, qreal spanAngleInDegrees, qreal width) |
| 182 | { |
| 183 | qreal startAngleInDegrees = - startRadius.angle(); |
| 184 | if (startAngleInDegrees > 180) |
| 185 | startAngleInDegrees -= 360; |
| 186 | else if (startAngleInDegrees < -180) |
| 187 | startAngleInDegrees += 360; |
| 188 | |
| 189 | qreal radiusLength = startRadius.length(); |
| 190 | qreal angle = 2 * asin(width / (2 * radiusLength)) * 180 / PI; |
| 191 | bool overlap = qAbs(spanAngleInDegrees) > 360 - angle; |
| 192 | if (overlap) |
| 193 | spanAngleInDegrees = spanAngleInDegrees < 0 ? -360 : 360; |
| 194 | |
| 195 | qreal endAngleInDegrees = startAngleInDegrees + spanAngleInDegrees; |
| 196 | |
| 197 | qreal innerRadius = radiusLength - width / 2; |
| 198 | QRectF innerSquare( |
| 199 | startRadius.p1().x() - innerRadius, |
| 200 | startRadius.p1().y() - innerRadius, |
| 201 | 2 * innerRadius, |
| 202 | 2 * innerRadius); |
| 203 | qreal outerRadius = radiusLength + width / 2; |
| 204 | QRectF outerSquare( |
| 205 | startRadius.p1().x() - outerRadius, |
| 206 | startRadius.p1().y() - outerRadius, |
| 207 | 2 * outerRadius, |
| 208 | 2 * outerRadius); |
| 209 | QRectF startSquare( |
| 210 | startRadius.p2().x() - width / 2, |
| 211 | startRadius.p2().y() - width / 2, |
| 212 | width, |
| 213 | width); |
| 214 | QRectF endSquare( |
| 215 | startRadius.p1().x() + radiusLength * cos(endAngleInDegrees * PI / 180.0) - width / 2, |
| 216 | startRadius.p1().y() + radiusLength * sin(endAngleInDegrees * PI / 180.0) - width / 2, |
| 217 | width, |
| 218 | width); |
| 219 | |
| 220 | QPainterPath painterPath( |
| 221 | QPointF( |
| 222 | startRadius.p1().x() + innerRadius * cos(startAngleInDegrees * PI / 180.0), |
| 223 | startRadius.p1().y() + innerRadius * sin(startAngleInDegrees * PI / 180.0))); |
| 224 | startAngleInDegrees = - startAngleInDegrees; |
| 225 | endAngleInDegrees = - endAngleInDegrees; |
| 226 | spanAngleInDegrees = - spanAngleInDegrees; |
| 227 | |
| 228 | painterPath.setFillRule(Qt::WindingFill); |
| 229 | painterPath.arcTo(innerSquare, startAngleInDegrees, spanAngleInDegrees); |
| 230 | painterPath.arcTo(endSquare, 180.0 + endAngleInDegrees, spanAngleInDegrees > 0 ? -180.0 : 180.0); |
| 231 | painterPath.arcTo(outerSquare, endAngleInDegrees, - spanAngleInDegrees); |
| 232 | painterPath.arcTo(startSquare, startAngleInDegrees, spanAngleInDegrees > 0 ? -180.0 : 180.0); |
| 233 | painterPath.closeSubpath(); |
| 234 | |
| 235 | return painterPath.toFillPolygon(); |
| 236 | } |
| 237 | |
| 238 | /** |