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#include "stdafx.h"
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#include "HTrackerTransform.h"
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HTrackerTransform::HTrackerTransform()
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:m_handle(0)
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,m_bDrag(false)
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,m_bCanMoved(false)
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,m_nAllowMovePixel(5)
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,m_kind(HTRACKER_TRANSFORM_KIND_SCALE)
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{
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m_StartPhi = 0.0f;
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m_Transform.Reset();
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}
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//参数:mousePt 开始拖拽时,鼠标的坐标.
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void HTrackerTransform::Init(int handle, const CRect & boundRect, CPoint mousePt)
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{
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m_bDrag = true;
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m_bCanMoved = false;
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m_StartPhi = 0.0f;
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m_StartPoint = mousePt;
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if (handle == 8) //平移
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m_kind = HTRACKER_TRANSFORM_KIND_MOVE;
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else
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m_kind = HTRACKER_TRANSFORM_KIND_SCALE;
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m_Transform.Reset();
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m_boundRect = boundRect;
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m_calculator.Calculate(m_boundRect);
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m_handle = handle;
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SetFixedPoints();
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}
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void HTrackerTransform::Draging(CPoint mousePt)
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{
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if (m_bDrag == false)
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return;
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if (m_kind == HTRACKER_TRANSFORM_KIND_SCALE)
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Scale(mousePt);
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else if (m_kind == HTRACKER_TRANSFORM_KIND_MOVE)
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Move(mousePt);
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else if (m_kind == HTRACKER_TRANSFORM_KIND_ROTATION)
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Rotate(mousePt);
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else //KIND_SHEAR
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Shear(mousePt);
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}
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void HTrackerTransform::EndDrag()
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{
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m_bDrag = false;
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m_Transform.Reset();
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m_handle = 0;
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m_bCanMoved = false;
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m_StartPhi = 0.0f;
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m_kind = HTRACKER_TRANSFORM_KIND_SCALE;
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}
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Gdiplus::Matrix * HTrackerTransform::GetMatrix()
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{
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return &m_Transform;
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}
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void HTrackerTransform::SetKind(HTRACKER_TRANSFORM_KIND kind)
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{
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m_kind = kind;
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SetFixedPoints();
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}
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//函数功能:设置选中的handle对应的不动点。
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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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//拖拽Handle时的不动点
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//拖拽0Handle时，对应的不动点为4。拖拽1Handle时，对应的不动点为5。依次为2-->6,3-->7,
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//4-->0,5-->1,6-->2,7-->3.
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//handle ^ 4， 会找到对应的不动点。
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void HTrackerTransform::SetFixedPoints()
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{
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//m_handle的范围:[0,8]
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if (m_handle < 0 || m_handle>8)
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return ;
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int hFixed = m_handle ^ 4;
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//m_FixedSrc = GetHandlePoint(m_PointSrc, hFixed);
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//m_FixedDest = GetHandlePoint(m_PointDest, hFixed);
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m_FixedSrc = m_calculator.GetHandlePoint(hFixed);
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m_FixedDest = m_FixedSrc;
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if (m_kind == HTRACKER_TRANSFORM_KIND_ROTATION)
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{
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CSize sz = CPoint(m_calculator.Test(m_handle / 2)) - m_FixedSrc;
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m_StartPhi = 180.0f * (Gdiplus::REAL) (atan2((double)sz.cy, sz.cx) / PI);
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}
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}
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//参数:point 鼠标点
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void HTrackerTransform::Scale(CPoint & point)
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{
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//m_FixedDest is the selected handle point of destination rectangle
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CSize sz = point - m_FixedDest;
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//m_FixedSrc is the selected handle point of source rectangle
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CSize szSrc = m_StartPoint - m_FixedSrc;
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Gdiplus::REAL scaleX = 1.0f;
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Gdiplus::REAL scaleY = 1.0f;
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if ((m_handle & 1) == 0) //偶数点为角点，X,Y方向缩放。
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{
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if (szSrc.cx != 0)
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scaleX = (Gdiplus::REAL) sz.cx / (Gdiplus::REAL) szSrc.cx;
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//if (!(m_Options & OptionAllowMirror) && scaleX < 0.0f)
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// scaleX = 0.0f; //no allow mirror x
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if (szSrc.cy != 0)
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scaleY = (Gdiplus::REAL) sz.cy / (Gdiplus::REAL) szSrc.cy;
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//if (!(m_Options & OptionAllowMirror) && scaleY < 0.0f)
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// scaleY = 0.0f; //no allow mirror y
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// if (!(nFlags & MK_SHIFT)) // maintain proportions, //当按下SHIFT键时等比例缩放
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// {
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// Gdiplus::REAL scaleXabs = fabsf(scaleX);
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// Gdiplus::REAL scaleYabs = fabsf(scaleY);
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// if (scaleXabs > scaleYabs) scaleX = (scaleX < 0) ? -scaleYabs : scaleYabs;
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// else scaleY = (scaleY < 0) ? -scaleXabs : scaleXabs;
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// }
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// Set cursor; might be changed after flipping
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//int curs = (m_Handle & 2) / 2; // 0 or 1
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//if (m_bMapFlip) curs ^= 1;
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//curs ^= scaleX < 0;
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//curs ^= scaleY < 0;
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//HCURSOR h = g_hCursor[curs];
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//if (h)
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// ::SetCursor(h);
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}
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else if ((m_handle & 3) == 1) // horizontal edge, scale vertical
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{
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if (szSrc.cy != 0)
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scaleY = (Gdiplus::REAL) sz.cy / (Gdiplus::REAL) szSrc.cy;
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//if (!(m_Options & OptionAllowMirror) && scaleY < 0.0f)
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// scaleY = 0.0f;
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//if (nFlags & MK_SHIFT)
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// scaleX = scaleY; //当按下SHIFT键时等比例缩放
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}
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else if ((m_handle & 3) == 3) // vertical edge, scale horizontal
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{
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if (szSrc.cx != 0)
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scaleX = (Gdiplus::REAL) sz.cx / (Gdiplus::REAL) szSrc.cx;
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//if (!(m_Options & OptionAllowMirror) && scaleX < 0.0f)
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// scaleX = 0.0f;
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// if (nFlags & MK_SHIFT)
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// scaleY = scaleX; //当按下SHIFT键时等比例缩放
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}
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m_Transform.Reset();
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// Translate the fixed point to the origin.
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m_Transform.Translate((Gdiplus::REAL) - m_FixedSrc.x, (Gdiplus::REAL) - m_FixedSrc.y, Gdiplus::MatrixOrderAppend);
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// Scale the object.
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m_Transform.Scale(scaleX, scaleY, Gdiplus::MatrixOrderAppend);
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// Translate back to fixed point (which may be different).
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m_Transform.Translate((Gdiplus::REAL)m_FixedDest.x, (Gdiplus::REAL)m_FixedDest.y, Gdiplus::MatrixOrderAppend);
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}
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void HTrackerTransform::Move(CPoint & point)
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{
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CSize sz = point - m_StartPoint;
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//为了防止不小心移动元素，当超过该值时才起作用（允许移动像素个数）
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if (IsCanMove(point, m_StartPoint))
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{
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m_Transform.Reset();
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m_Transform.Translate((Gdiplus::REAL)sz.cx, (Gdiplus::REAL)sz.cy);
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}
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}
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bool HTrackerTransform::IsCanMove(const CPoint& nPrevPoint, const CPoint& nCurPoint)
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{
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if (m_bCanMoved)
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return true;
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CSize sz = nCurPoint - nPrevPoint;
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//为了防止不小心移动元素，当超过该值时才起作用（允许移动像素个数）
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if (abs(sz.cx) >= m_nAllowMovePixel || abs(sz.cy) >= m_nAllowMovePixel)
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{
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m_bCanMoved = true;
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return true;
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}
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return false;
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}
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void HTrackerTransform::Rotate(CPoint & point)
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{
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CSize sz = point - m_FixedDest;
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Gdiplus::REAL phi = 180.0f * (Gdiplus::REAL)(atan2((double)sz.cy, (double)sz.cx) / PI) - m_StartPhi;
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while (phi <= -180.0f)
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phi += 360.0f; // (-180, 180]
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m_Transform.Reset();
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m_Transform.Translate((Gdiplus::REAL) - m_FixedSrc.x, (Gdiplus::REAL) - m_FixedSrc.y);
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m_Transform.Rotate(phi, Gdiplus::MatrixOrderAppend);
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m_Transform.Translate((Gdiplus::REAL) m_FixedDest.x, (Gdiplus::REAL) m_FixedDest.y, Gdiplus::MatrixOrderAppend);
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}
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void HTrackerTransform::Shear(CPoint & point)
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{
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CSize sz = point - m_FixedDest;
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CSize szSrc = m_StartPoint - m_FixedSrc;
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Gdiplus::REAL shearX = 0.0f;
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Gdiplus::REAL shearY = 0.0f;
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Gdiplus::REAL scaleX = 1.0f;
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Gdiplus::REAL scaleY = 1.0f;
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if (m_handle & 2) // vertical edge
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{
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if (sz.cx != 0)
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shearY = (Gdiplus::REAL) sz.cy / (Gdiplus::REAL) sz.cx;
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if (szSrc.cx != 0)
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scaleX = (Gdiplus::REAL) sz.cx / (Gdiplus::REAL) szSrc.cx;
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//if (!(m_Options&OptionAllowMirror) && scaleX < 0.0f) scaleX = 0.0f;
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}
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else // horizontal edge
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{
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if (sz.cy != 0)
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shearX = (Gdiplus::REAL) sz.cx / (Gdiplus::REAL) sz.cy;
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if (szSrc.cy != 0)
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scaleY = (Gdiplus::REAL) sz.cy / (Gdiplus::REAL) szSrc.cy;
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//if (!(m_Options&OptionAllowMirror) && scaleY < 0.0f) scaleY = 0.0f;
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}
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m_Transform.Reset();
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m_Transform.Translate((Gdiplus::REAL) - m_FixedSrc.x, (Gdiplus::REAL) - m_FixedSrc.y);
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// Don't scale the other direction if Shift is pressed
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//if ((nFlags & MK_SHIFT) == 0) m_Transform.Scale(scaleX, scaleY, Gdiplus::MatrixOrderAppend);
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m_Transform.Shear(shearX, shearY, Gdiplus::MatrixOrderAppend);
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m_Transform.Translate((Gdiplus::REAL) m_FixedDest.x, (Gdiplus::REAL) m_FixedDest.y, Gdiplus::MatrixOrderAppend);
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} |