/*

    File:       ScaleAndRotate.c

    Description: This example uses graphics importers to draw an image then demonstrates

                 how to perform scaling, rotation and perspective manipulation using matrix

                 operations.

                 Test Sample Image : Sample 1-Snowgum.jpg

    Author:     QuickTime Engineering, DTS

    Copyright:  © Copyright 1999 - 2002 Apple Computer, Inc. All rights reserved.

    Disclaimer: IMPORTANT:  This Apple software is supplied to you by Apple Computer, Inc.

                ("Apple") in consideration of your agreement to the following terms, and your

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                please do not use, install, modify or redistribute this Apple software.

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                this notice and the following text and disclaimers in all such redistributions of

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                expressly stated in this notice, no other rights or licenses, express or implied,

                are granted by Apple herein, including but not limited to any patent rights that

                may be infringed by your derivative works or by other works in which the Apple

                Software may be incorporated.

                The Apple Software is provided by Apple on an "AS IS" basis.  APPLE MAKES NO

                WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED

                WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR

                PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN

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                IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR

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    Change History (most recent first): <2> 4/22/02 released as dts sample code

                                        <1> 4/1/99 initial release

*/

#include "MacShell.h"

void ScaleAndRotate( void )

{

    OSErr  err = noErr;

    Handle hOpenTypeList = NewHandle(0);

    long   numTypes = 0;

    FSSpec theFSSpec;

    GraphicsImportComponent importer = 0;

    Rect naturalBounds, windowBounds, scaledBounds;

    MatrixRecord matrix;

    Fixed naturalWidth, naturalHeight;

    FixedPoint fromQuad[4], toQuad[4];

    BuildGraphicsImporterValidFileTypes( hOpenTypeList, &numTypes );

    HLock( hOpenTypeList );

    err = GetOneFileWithPreview(numTypes, (OSTypePtr)*hOpenTypeList, &theFSSpec, NULL);

    DisposeHandle( hOpenTypeList );

    if ( err ) return;

    // locate and open a graphics importer component

    err = GetGraphicsImporterForFile( &theFSSpec, &importer );

    // get the native size of the image associated with the importer

    err = GraphicsImportGetNaturalBounds( importer, &naturalBounds );

    windowBounds = naturalBounds;

    OffsetRect( &windowBounds, 10, 45 );

    window = NewCWindow( NULL, &windowBounds, "\pScale and Rotate ", true, documentProc, (WindowPtr)-1, true, 0);

    // set the graphics port for drawing

    err = GraphicsImportSetGWorld( importer, GetWindowPort( window ), NULL );

    // draw the image

    err = GraphicsImportDraw( importer );

    pause();

    // scale the image by a factor of 2x.  

    // the top-left coordinate of an image's natural bounds is always (0,0).

    scaledBounds = naturalBounds;

    scaledBounds.right = scaledBounds.right * 2;

    scaledBounds.bottom = scaledBounds.bottom * 2;

    // define the rectangle in which to draw an image

    err = GraphicsImportSetBoundsRect( importer,        // importer instance

                                       &scaledBounds ); // desired bounds

    // resize the window to fit, and redraw.

    SizeWindow( window, scaledBounds.right, scaledBounds.bottom, false );

    err = GraphicsImportDraw( importer );

    pause();

    // rotate the image ninety degrees clockwise

    // set the contents of a matrix so that it performs no transformation

    SetIdentityMatrix( &matrix );

    // modify the contents of a matrix so that it defines a rotation operation

    // 90 degrees to the right - anchor at 0.0 top-left 

    RotateMatrix( &matrix,          // pointer to the matrix structure

                  Long2Fix( 90 ),   // the number of degrees of rotation NOTE: THIS IS A FIXED VALUE

                  0,                // x coordinate of anchor point

                  0 );              // y coordinate of anchor point

    // we need to return the top-left corner of the rotated image back to it's

    // origin, so add a translation value to a specified matrix 

    TranslateMatrix( &matrix,                           // pointer to the matrix structure

                     Long2Fix( naturalBounds.bottom ),  // deltaH - value added to the x coordinate NOTE: FIXED VALUES

                     0 );                               // deltaV - value added to the y coordinate 

    // set the transformation matrix to use for drawing an image             

    err = GraphicsImportSetMatrix( importer, &matrix );

    // resize the window to fit, and redraw.

    // get the new bounds rect, size the window then draw

    err = GraphicsImportGetBoundsRect( importer, &scaledBounds );

    SizeWindow( window, scaledBounds.right, scaledBounds.bottom, false );

    err = GraphicsImportDraw( importer );

    pause();

    // give the image some hefty perspective.

    // set up two quadrilateral coordinates and create a translation matrix

    // from one to the other using QuadToQuadMatrix()

    // QuadToQuadMatrix was added in QuickTime 4.0.

    naturalWidth = Long2Fix( naturalBounds.right );

    naturalHeight = Long2Fix( naturalBounds.bottom );

    fromQuad[0].x = 0;

    fromQuad[0].y = 0;

    fromQuad[1].x = naturalWidth;

    fromQuad[1].y = 0;

    fromQuad[2].x = naturalWidth;

    fromQuad[2].y = naturalHeight;

    fromQuad[3].x = 0;

    fromQuad[3].y = naturalHeight;

    toQuad[0].x = naturalWidth/8;

    toQuad[0].y = naturalHeight/4;

    toQuad[1].x = naturalWidth*9/8;

    toQuad[1].y = 0;

    toQuad[2].x = naturalWidth;

    toQuad[2].y = naturalHeight*6/4;

    toQuad[3].x = 0;

    toQuad[3].y = naturalHeight;

    SetIdentityMatrix( &matrix );

    QuadToQuadMatrix( (Fixed *)fromQuad, (Fixed *)toQuad, &matrix );

    err = GraphicsImportSetMatrix( importer, &matrix );

    // resize the window to fit, and redraw

    // get the new bounds rect, size the window then draw

    err = GraphicsImportGetBoundsRect( importer, &scaledBounds );

    SizeWindow( window, scaledBounds.right, scaledBounds.bottom, false );

    SetPortWindowPort( window );

    EraseRect( &scaledBounds );

    err = GraphicsImportDraw( importer );

    CloseComponent( importer );

}