bool MgArc::_setHandlePoint(int index, const Point2d& pt, float)
{
if (index == 1) {
return setStartMidEnd(pt, getMidPoint(), getEndPoint());
}
if (index == 2) {
return setStartMidEnd(getStartPoint(), getMidPoint(), pt);
}
if (index == 3) {
return setStartMidEnd(getStartPoint(), pt, getEndPoint());
}
if (index == 4) {
float a = (pt - getCenter()).angle2();
return setCenterRadius(getCenter(), getRadius(), a, getEndAngle() - a);
}
if (index == 5) {
float a = (pt - getCenter()).angle2();
return setCenterRadius(getCenter(), getRadius(), getStartAngle(), a - getStartAngle());
}
if (index == 6) {
return setTanStartEnd(pt - getStartPoint(), getStartPoint(), getEndPoint());
}
if (index == 7) {
return (setTanStartEnd(getEndPoint() - pt, getEndPoint(), getStartPoint())
&& _reverse());
}
return setCenterStartEnd(pt, getStartPoint(), getEndPoint());
}
bool MgArc::setTanStartEnd(const Vector2d& startTan, const Point2d& start, const Point2d& end)
{
Point2d center;
float radius, startAngle, sweepAngle = 0;
return mgArcTan(start, end, startTan, center, radius, &startAngle, &sweepAngle)
&& setCenterRadius(center, radius, startAngle, sweepAngle);
}
bool MgArc::setStartMidEnd(const Point2d& start, const Point2d& point, const Point2d& end)
{
Point2d center;
float radius, startAngle, sweepAngle = 0;
return mgArc3P(start, point, end, center, radius, &startAngle, &sweepAngle)
&& setCenterRadius(center, radius, startAngle, sweepAngle);
}
bool MgArc::setCenterStartEnd(const Point2d& center, const Point2d& start, const Point2d& end)
{
float startAngle = (start - center).angle2();
float endAngle = (end - center).angle2();
float sweepAngle = mgToRange(endAngle - startAngle, -_M_2PI, _M_2PI);
if (!mgIsZero(sweepAngle)) {
float lastSweepAngle = getSweepAngle();
if (fabsf( fabsf(sweepAngle) - fabsf(lastSweepAngle) ) > _M_PI_6) {
sweepAngle = sweepAngle + (sweepAngle > 0 ? -_M_2PI : _M_2PI);
}
}
return setCenterRadius(center, start.distanceTo(center), startAngle, sweepAngle);
}
bool MgArc::setCSE(const Point2d& center, const Point2d& start,
const Point2d& end, float lastSweepAngle)
{
float startAngle = (start - center).angle2();
float endAngle = (end - center).angle2();
float sweepAngle = mgbase::toRange(endAngle - startAngle, -_M_2PI, _M_2PI);
if (fabsf(sweepAngle - lastSweepAngle) > _M_PI) {
if (fabsf(sweepAngle) < _M_D2R * 5 && fabsf(lastSweepAngle) > _M_PI + _M_PI_2) {
sweepAngle = lastSweepAngle > 0 ? _M_2PI : -_M_2PI;
} else {
sweepAngle = sweepAngle + (sweepAngle > 0 ? -_M_2PI : _M_2PI);
}
}
return setCenterRadius(center, start.distanceTo(center), startAngle, sweepAngle);
}
bool MgArc::_setHandlePoint2(int index, const Point2d& pt, float, int& data)
{
static float lastSweepAngle;
if (index == 1 || index == 2) { // 起点、终点
return setCenterRadius(getCenter(), pt.distanceTo(getCenter()), getStartAngle(), getSweepAngle());
}
if (index == 3) { // 弧线中点
return setStartMidEnd(getStartPoint(), pt, getEndPoint());
}
if (index == 4) { // 改变起始角度
if (data == 0) {
lastSweepAngle = getSweepAngle();
data++;
}
Point2d startPt(getCenter().polarPoint((pt - getCenter()).angle2(), getRadius()));
bool ret = setCSE(getCenter(), startPt, getEndPoint(), lastSweepAngle);
lastSweepAngle = getSweepAngle();
return ret;
}
if (index == 5) { // 改变终止角度
if (data == 0) {
lastSweepAngle = getSweepAngle();
data++;
}
Point2d endPt(getCenter().polarPoint((pt - getCenter()).angle2(), getRadius()));
bool ret = setCSE(getCenter(), getStartPoint(), endPt, lastSweepAngle);
lastSweepAngle = getSweepAngle();
return ret;
}
if (index == 6) {
return setTanStartEnd(pt - getStartPoint(), getStartPoint(), getEndPoint());
}
if (index == 7) {
return (setTanStartEnd(getEndPoint() - pt, getEndPoint(), getStartPoint())
&& _reverse());
}
return offset(pt - getCenter(), -1);
}
bool MgArc::setCenterStartEnd(const Point2d& center, const Point2d& start)
{
float startAngle = (start - center).angle2();
return setCenterRadius(center, start.distanceTo(center), startAngle, 0);
}
