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#include "stdafx.h"
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#include "HTrackerHandleCalculator.h"
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HTrackerHandleCalculator::HTrackerHandleCalculator()
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:m_HandleSize(12)
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{
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memset(m_Points, 0, sizeof(m_Points));
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}
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//创建Tracker矩形的四个角点和中心点
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void HTrackerHandleCalculator::Calculate(const CRect & boundRect)
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{
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//CRect rc(boundRect);
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//rc.InflateRect(m_OuterMargin, m_OuterMargin);
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m_Points[0].x = m_Points[3].x = boundRect.left;
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m_Points[1].x = m_Points[2].x = boundRect.right;
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m_Points[0].y = m_Points[1].y = boundRect.top;
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m_Points[2].y = m_Points[3].y = boundRect.bottom;
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m_Points[4] = boundRect.CenterPoint();
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}
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CRect HTrackerHandleCalculator::GetHandleRect(int iHandle)
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{
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//if (iHandle == HandleBody)
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//return m_StartRect;
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CRect rc;
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rc.SetRectEmpty();
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rc.OffsetRect(GetHandlePoint(m_Points, iHandle));
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int d = m_HandleSize / 2;
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rc.InflateRect(d, d);
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return rc;
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}
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CPoint HTrackerHandleCalculator::GetHandlePoint(int iHandle)
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{
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return GetHandlePoint(m_Points, iHandle);
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}
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POINT HTrackerHandleCalculator::GetCenterPoint()
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{
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return m_Points[4];
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}
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void HTrackerHandleCalculator::Reset()
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{
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memset(m_Points, 0, sizeof(m_Points));
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}
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POINT HTrackerHandleCalculator::Test(int i)
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{
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return m_Points[i];
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}
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//pPoints为m_PointSrc
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CPoint HTrackerHandleCalculator::GetHandlePoint(LPPOINT pPoints, int iHandle)
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{
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// Handles are numbered clockwise, like this:
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//
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// HandleTopLeft HandleTop HandleTopRight
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// 0 1 2
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// *-----------*-----------*
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// | |
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// | |
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// HandleLeft 7 * * 8 * 3 HandleRight
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// | HandleCenter |
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// | |
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// *-----------*-----------*
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// 6 5 4
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// HandleBottomLeft HandleBottom HandleBottomRight
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//
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// The center point is handle 8, the HandleBody is handle 9.
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if (iHandle >= 8)
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return pPoints[4]; // center
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//如果为偶数点，则为角点。
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//m_PointSrc前四个点为角点。iHandle点隔一点就是角点。
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//所以除以2，就获得了iHandle对应的角点的索引。
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int i = iHandle / 2;
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if ((iHandle & 1) == 0)
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return pPoints[i]; // corner
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int j = i + 1;
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if (j > 3) j = 0;
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//求出边线的中点
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CPoint pnt;
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pnt.x = (pPoints[i].x + pPoints[j].x) / 2;
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pnt.y = (pPoints[i].y + pPoints[j].y) / 2;
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return pnt; // edge
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} |