/// <summary>
/// 根据三个点来更新圆弧
/// </summary>
public void UpdateArcFrom3Points()
{
//Console.WriteLine("UpdateArcFrom3Points()");
m_center = HitUtil.CenterPointFrom3Points(m_p1, m_p2, m_p3);
m_radius = (float)HitUtil.Distance(m_center, m_p1);
StartAngle = (float)HitUtil.RadiansToDegrees(HitUtil.LineAngleR(m_center, m_p1, 0));
EndAngle = (float)HitUtil.RadiansToDegrees(HitUtil.LineAngleR(m_center, m_p3, 0));
// find angle from P1 on line P1|P3 to P2. If this angle is 0-180 the direction is CCW else it is CW
double p1p3angle = HitUtil.RadiansToDegrees(HitUtil.LineAngleR(m_p1, m_p3, 0));
double p1p2angle = HitUtil.RadiansToDegrees(HitUtil.LineAngleR(m_p1, m_p2, 0));
double diff = p1p3angle - p1p2angle;
//我知道这个逻辑存在问题，在某些情况下，圆弧的绘制不跟随鼠标，
//但是现在也会奏效。
Direction = eDirection.kCCW;
if (diff < 0 || diff > 180)
{
Direction = eDirection.kCW;
}
if (p1p3angle == 0)
{
if (diff < -180)
{
Direction = eDirection.kCCW;
}
else
{
Direction = eDirection.kCW;
}
}
if (p1p3angle == 90)
{
if (diff < -180)
{
Direction = eDirection.kCCW;
}
}
}
public void UpdateArcFrom3Points()
{
m_center = HitUtil.CenterPointFrom3Points(m_p1, m_p2, m_p3);
m_radius = (float)HitUtil.Distance(m_center, m_p1);
StartAngle = (float)HitUtil.RadiansToDegrees(HitUtil.LineAngleR(m_center, m_p1, 0));
EndAngle = (float)HitUtil.RadiansToDegrees(HitUtil.LineAngleR(m_center, m_p3, 0));
// find angle from P1 on line P1|P3 to P2. If this angle is 0-180 the direction is CCW else it is CW
double p1p3angle = HitUtil.RadiansToDegrees(HitUtil.LineAngleR(m_p1, m_p3, 0));
double p1p2angle = HitUtil.RadiansToDegrees(HitUtil.LineAngleR(m_p1, m_p2, 0));
double diff = p1p3angle - p1p2angle;
// I know there is a problem with this logic, in some cases the arc does not follow the mouse,
// but it will work for now.
Direction = eDirection.kCCW;
if (diff < 0 || diff > 180)
{
Direction = eDirection.kCW;
}
if (p1p3angle == 0)
{
if (diff < -180)
{
Direction = eDirection.kCCW;
}
else
{
Direction = eDirection.kCW;
}
}
if (p1p3angle == 90)
{
if (diff < -180)
{
Direction = eDirection.kCCW;
}
}
}
public void UpdateArcFrom3Points()
{
try
{
m_center = HitUtil.CenterPointFrom3Points(m_p1, m_p2, m_p3);
m_radius = (float)HitUtil.Distance(m_center, m_p1);
StartAngle = (float)HitUtil.RadiansToDegrees(HitUtil.LineAngleR(m_center, m_p1, 0));
EndAngle = (float)HitUtil.RadiansToDegrees(HitUtil.LineAngleR(m_center, m_p3, 0));
double p1p3angle = HitUtil.RadiansToDegrees(HitUtil.LineAngleR(m_p1, m_p3, 0));
double p1p2angle = HitUtil.RadiansToDegrees(HitUtil.LineAngleR(m_p1, m_p2, 0));
double diff = p1p3angle - p1p2angle;
Direction = eDirection.kCCW;
if (diff < 0 || diff > 180)
{
Direction = eDirection.kCW;
}
if (p1p3angle == 0)
{
if (diff < -180)
{
Direction = eDirection.kCCW;
}
else
{
Direction = eDirection.kCW;
}
}
if (p1p3angle == 90)
{
if (diff < -180)
{
Direction = eDirection.kCCW;
}
}
}
catch (Exception ex)
{ throw ex; }
}
public void UpdateCircleFrom3Points()
{
m_center = HitUtil.CenterPointFrom3Points(m_p1, m_p2, m_p3);
m_radius = (float)HitUtil.Distance(m_center, m_p1);
}
