opshear.cpp

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// $Id: opshear.cpp 1282 2006-06-09 09:46:49Z alex $
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 */
// The Shear transform Operation

/*
*/

#include "camtypes.h"
#include "opshear.h"

//#include "app.h" - in camtypes.h [AUTOMATICALLY REMOVED]
//#include "docview.h" - in camtypes.h [AUTOMATICALLY REMOVED]
//#include "ink.h" - in camtypes.h [AUTOMATICALLY REMOVED]
//#include "trans2d.h" - in camtypes.h [AUTOMATICALLY REMOVED]
//#include "rik.h"
//#include "docview.h" - in camtypes.h [AUTOMATICALLY REMOVED]
//#include "clikdrag.h"


DECLARE_SOURCE("$Revision: 1282 $");

// An implement to match the Declare in the .h file.
CC_IMPLEMENT_DYNCREATE(OpShearTrans, TransOperation)

// This will get Camelot to display the filename and linenumber of any memory allocations
// that are not released at program exit
#define new CAM_DEBUG_NEW




/********************************************************************************************

>   OpShearTrans::OpShearTrans()

    Author:     Rik_Heywood (Xara Group Ltd) <camelotdev@xara.com>
    Created:    20/7/93
    Purpose:    Constructor. Does nothing.

********************************************************************************************/

OpShearTrans::OpShearTrans(): TransOperation()
{
    // Reset all the infomation about things
    SelWidth = SelHeight = 0;

    // Default to horizontal
    IsHorizontal = TRUE;

    // Start off with no shearing at all
    ShearBy = FIXED16(0);

    // Set status help text
    StatusHelpID = _R(IDS_SHEARTRANS_STATUS1);
    StatusHelpID2=_R(IDS_SHEARTRANS_STATUS2);
}



/********************************************************************************************

>   void OpShearTrans::SetStartBlob(INT32 StartBlob)

    Author:     Rik_Heywood (Xara Group Ltd) <camelotdev@xara.com>
    Created:    25/7/94
    Inputs:     StartBlob  - the Number of the blob that the operation was initiated on,
                if applicabale. They are numbered as follows :-
                MonoOn
                1  2  3
                4     5
                6  7  8
                MonoOff
                All operations that were not started from one of the 8 blobs should use 0
    Purpose:    Allows the operations to know how it was started. This operation is
                interested in the horizontal / vertical nature of the transform

********************************************************************************************/

void OpShearTrans::SetStartBlob(INT32 StartBlob)
{
    // Only blobs 2, 7, 4 and 5 are relavant. All others are a problem
    ENSURE( (StartBlob==2) || (StartBlob==4) || (StartBlob==5) || (StartBlob==7),
            "Shear started a blob that it should not have done");

    // blobs 2 and 7 are the Middle Top and Middle Bottom blobs
    // and would suggest horizontal shearing
    if ((StartBlob==2) || (StartBlob==7))
        IsHorizontal = TRUE;
    else
        IsHorizontal = FALSE;

}




/********************************************************************************************
>   virtual void OpShearTrans::InitTransformImmediate(OpParam* pParam)

    Author:     Justin_Flude (Xara Group Ltd) <camelotdev@xara.com>
    Created:    4/11/94
    Inputs:     pParam      ---     pointer an OpParam whose Param2 member is a pointer
                                    to a FIXED16 that represents the angle in degrees to 
                                    shear by.
    Outputs:    -
    Returns:    -
    Purpose:    
    Errors:     -
    SeeAlso:    -
********************************************************************************************/

void OpShearTrans::InitTransformImmediate(OpParam* pParam)
{
    FIXED16 pDegreesShearAngle = *((FIXED16*)PVOID(pParam->Param2));
    double ShearAngle = pDegreesShearAngle.MakeDouble();

    if (ShearAngle < -89.0)                     // Clip the shear angle to a sensible range
        ShearAngle = -89.0;

    if (ShearAngle > 89.0)
        ShearAngle = 89.0;

    ShearAngle = (ShearAngle*2*PI)/360.0;       // Convert to Radians
    ShearBy = (FIXED16)(tan(ShearAngle));       // And get the Shear distance to bung in the matrix
}




/********************************************************************************************

>   virtual void OpShearTrans::InitTransformOnDrag(DocCoord PointerPos, ClickModifiers ClickMods)

    Author:     Rik_Heywood (Xara Group Ltd) <camelotdev@xara.com>
    Created:    19/7/94
    Inputs:     PointerPos - The position of the mouse at the start of the drag
                ClickMods - the keyboard modifiers that were active at the start of the drag
    Purpose:    Sets up the parameters needed to build the transform matrix at the start
                of the drag. This base class version of this function does nothing.

********************************************************************************************/

void OpShearTrans::InitTransformOnDrag(DocCoord PointerPos, ClickModifiers ClickMods)
{
    // Make a note of the latest position of the mouse
    LastPos = PointerPos;

    // At the start of the drag the Shear factor will always by none
    ShearBy = FIXED16(0);

    // Find out how big the selection is
//  SelRange* Selection = GetApplication()->FindSelection();
//  DocRect SelRect = Selection->GetBoundingRect();

    // Find the width and the height of the selection
//  SelWidth = SelRect.Width();
//  SelHeight = SelRect.Height();

    // Use the Width and Height of the object AS PASSED IN from the caller
    // (If we just use the width/height of the selection, we may get it all horribly wrong, as
    // they may want to scale with or without including the effects of attributes, which
    // can significantly affect the size of the bounding rectangle to be used)
    SelWidth  = BoundingData.Width;
    SelHeight = BoundingData.Height;
}




/********************************************************************************************

>   virtual void OpShearTrans::UpdateTransformOnDrag(DocCoord PointerPos, Spread*, ClickModifiers& ClickMods)

    Author:     Rik_Heywood (Xara Group Ltd) <camelotdev@xara.com>
    Created:    19/7/94
    Inputs:     PointerPos - The latest position of the mouse
                Spread the mouse is over - not used
                Clickmodifiers in place - not used
    Purpose:    Does the calculations needed when the mouse moves to keep all the params
                needed to build the rotation matrix up to date.

********************************************************************************************/

void OpShearTrans::UpdateTransformOnDrag(DocCoord PointerPos, Spread* pClickSpread, ClickModifiers& ClickMods)
{
    // Make sure that the cursor does not wrap around at the edge of spreads
    if (pClickSpread != StartSpread)
        PointerPos = MakeRelativeToSpread(StartSpread, pClickSpread, PointerPos);

    if (!ClickMods.Constrain)
        DocView::SnapSelected(pClickSpread, &PointerPos, FALSE, TRUE);

    // Make a note of the latest position of the mouse
    LastPos = PointerPos;

    double dx = PointerPos.x - CentreOfTrans.x;
    double dy = PointerPos.y - CentreOfTrans.y;

    // Work out the shear factor and angle
    double ShearAngle;
    if (IsHorizontal)
    {
        // Work out the horizontal shearing
        dy = StartPos.y - CentreOfTrans.y;
        ShearBy = FIXED16( dx / dy);
        ShearAngle = atan2(dx, dy);
    }
    else
    {
        // Work out the vertical shearing
        dx = StartPos.x - CentreOfTrans.x;
        ShearBy = FIXED16( dy / dx);
        ShearAngle = atan2(dy, dx);
    }

    // Update the boundingdata infomation about the constrain
    ShearAngle = (ShearAngle / (2.0*PI)) * 360.0;
    BoundingData.Shear = (ANGLE) ShearAngle;
    BoundingData.ShearChanged = TRUE;
}





/********************************************************************************************

>   void OpShearTrans::ConstrainDrag(DocCoord* PointerPos)

    Author:     Rik_Heywood (Xara Group Ltd) <camelotdev@xara.com>
    Created:    6/9/94
    Outputs:    PointerPos - Adjusts the mouse position so that it is constrained
    Purpose:    Constrains the drag by the constrain angle. If the angle becomes too shallow
                (eg 90 degrees) the constrain will stop constraining and let it move freely.

********************************************************************************************/

void OpShearTrans::ConstrainDrag(DocCoord* PointerPos)
{
    // Make a copy of the coord in case we want to put it back
    DocCoord WorkingCopy = *PointerPos;
    BOOL UseWorkingCopy = FALSE;

    // Snap the pointer coord so that it runs along one of the rays
    DocView::ConstrainToAngle(CentreOfTrans, &WorkingCopy);

    // find out the x & y distance from the centre
    INT32 dx = WorkingCopy.x - CentreOfTrans.x;
    INT32 dy = WorkingCopy.y - CentreOfTrans.y;

    if (IsHorizontal)
    {
        if (dy!=0)
        {
            // This is a horizontal drag, so make sure that the pointer pos
            // lies on the horizon line level with the starting position
            // We need 64 bit numbers in the middle of the calculation so
            // use something that does it for us.
            dx = Mul32Div32(dx, StartPos.y-CentreOfTrans.y, dy);

            // only need to change the x component as that is all that is used
            WorkingCopy.x = CentreOfTrans.x + dx;
            WorkingCopy.y = StartPos.y;
            UseWorkingCopy = TRUE;
        }
    }
    else
    {
        if (dx!=0)
        {
            // Same but in the other axis
            dy = Mul32Div32(dy, StartPos.x-CentreOfTrans.x, dx) ;

            // Only change the y component this time
            WorkingCopy.y = CentreOfTrans.y + dy;
            WorkingCopy.x = StartPos.x;
            UseWorkingCopy = TRUE;
        }
    }

    // See if the constrain was valid
    if (UseWorkingCopy)
        *PointerPos = WorkingCopy;
}

/********************************************************************************************

>   void OpShearTrans::BuildMatrix()

    Author:     Rik_Heywood (Xara Group Ltd) <camelotdev@xara.com>
    Created:    19/7/94
    Purpose:    Builds the transform matrix required to Shear the selection about the
                point CentreOfRot

********************************************************************************************/

void OpShearTrans::BuildMatrix()
{
    // Translate to the origin
    Transform = Matrix(-CentreOfTrans.x, -CentreOfTrans.y);

    // We will need a matrix to put the shear in
    Matrix Shear;

    // Work out how much to shear the selection by
    if (IsHorizontal)
    {
        // Build the shear matrix for a horizontal shear
        Shear = Matrix(FIXED16(1), FIXED16(0), FIXED16(ShearBy), FIXED16(1), 0, 0);
    }
    else
    {
        // Build the shear matrix for a vertical shear
        Shear = Matrix(FIXED16(1), FIXED16(ShearBy), FIXED16(0), FIXED16(1), 0, 0);
    }

    // Apply the shear
    Transform *= Shear;

    // Translate back again
    Transform *= Matrix(CentreOfTrans.x, CentreOfTrans.y);
}




/********************************************************************************************

>   BOOL OpShearTrans::Declare()

    Author:     Rik_Heywood (Xara Group Ltd) <camelotdev@xara.com>
    Created:    5/7/93
    Returns:    TRUE if all went OK, False otherwise
    Purpose:    Adds the operation to the list of all known operations

********************************************************************************************/

BOOL OpShearTrans::Declare()
{
    return (RegisterOpDescriptor(
                                0, 
                                _R(IDS_SHEARTRANS),
                                CC_RUNTIME_CLASS(OpShearTrans),
                                OPTOKEN_SHEAR,
                                TransOperation::GetState)); 
}

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