Developer CD Series 1996 July: Mac OS SDK/Dev.CD Jul 96 SDK/Dev.CD Jul 96 SDK2.toast/Development Kits (Disc 2)/QuickDraw GX/Programming Stuff/Sample Code/Typography Samples/Hebrew Layout ƒ/Hebrew Layout.c

C/C++ Source or Header | 1995-04-10 | 17.5 KB | 517 lines | [TEXT/KAHL]

/**\
|**| =====================================================================
|**|
|**|    Hebrew Layout.c
|**|
|**|    This file contains a sample of a layout shape using Hindi text.
|**|    It requires the Ramatgan font if you don't want to see a lot of
|**|    strange characters.
|**|
|**|    QuickDraw GX Libraries Used:
|**|    "color library.c", "font library.c", "graphics debug library.c",
|**|    "layout library.c", "shape library.c", "transferMode library.c",
|**|    and "transform library.c"
|**|
|**|    ©1992-1994  Apple Computer, Inc.
|**|    All rights reserved.
|**|
|**| =====================================================================
\**/


#include "QDGX shell.h"
#include "layout routines.h"
#include "layout library.h"


/**\
|**| ---------------------------------------------------------------------
|**| PROTOTYPES
|**| ---------------------------------------------------------------------
\**/

// funtions required by shell

void    DoSetup            (void);
void    DoDraw            (WindowPtr wind, Boolean updating);
OSErr    DoCreateNew        (void);
void    DoDispose        (WindowPtr wind);
void    DoIdle            (WindowPtr wind);
void    DoTeardown        (void);
void    DoClick            (WindowPtr wind, Point p);

// private functions

OSErr    DoWindowInit        (WindowPtr wind);
void    CreateSampleImage    (WindowPtr wind);


/**\
|**| ---------------------------------------------------------------------
|**| ENUMS
|**| ---------------------------------------------------------------------
\**/
enum { rWindResource = 128 };


/**\
|**| ---------------------------------------------------------------------
|**| GLOBALS
|**| ---------------------------------------------------------------------
\**/
// If gDebugging = TRUE, graphics library errors and notices will be posted.  This
// functionality will only work with the "debugging" version of QuickDraw GX.
// If the debugging version is not installed, nothing bad will happen, but these
// functions will not work.

Boolean        gDebugging = true;

// Set  "gGiveMeValidation" to TRUE if you want receive run-time validation.

Boolean        gGiveMeValidation = true;


// gGraphicsHeapSize sets the size of the graphics heap created by calling the
// GXNewGraphicsClient routine in main () within QuickDraw GX shell.c.  You can determine
// the amount of graphics heap required by using GraphicsBug.  I'm giving it 600K,
// since we need abunch if we have several windows open.

long        gGraphicsHeapSize = 600;

// gOurPrintingOverrideUPP is a universal proc pointer for our printing event
// override.  This is so that our override can be native PowerPC code if necessary.

GXPrintingEventUPP    gOurPrintingOverrideUPP;



/**\
|**| ---------------------------------------------------------------------
|**| DoSetup()
|**| Here's where we initialize any global variables our application needs.
|**| We have only one at this time -- the universal proc pointer for
|**| our printing override.
|**| ---------------------------------------------------------------------
\**/
void DoSetup (void)
{    // Initialize our printing event override UPP
    gOurPrintingOverrideUPP = NewGXPrintingEventProc(MyPrintingEventOverride);
}


/**\
|**| ---------------------------------------------------------------------
|**| DoDraw()
|**| Draw the contents of the window.  The first parameter is the window
|**| to draw, and the second parameter is true if we're updating an existing
|**| image.  If that's the case, we don't want to change anything, but
|**| just draw what's already there.
|**| ---------------------------------------------------------------------
\**/
void DoDraw (WindowPtr wind, Boolean updating)
{
     #pragma unused (updating)
     GXDrawShape (GetDocShape(wind));
}


/**\
|**| ---------------------------------------------------------------------
|**| DoCreateNew()
|**| This routine is called when a window needs to be created.
|**| ---------------------------------------------------------------------
\**/
OSErr DoCreateNew (void)
{
    OSErr        err = noErr;
    WindowPtr    wind;

// Get and create our window from the resource fork

    wind = GetNewWindow(rWindResource, nil, (WindowPtr)-1L);

// Attach a default gxViewPort to it, create and iInitialize our
// private data for it, and add a sample image to its page shape.

    if ( wind == NULL )
        return (MemError());

    GXIgnoreGraphicsNotice(transform_already_set);
    SetDefaultViewPort(GXNewWindowViewPort(wind));
    GXPopGraphicsNotice();

    err = DoWindowInit(wind);
    if ( err != noErr )
        return err;

    CreateSampleImage(wind);
    return err;
}


/**\
|**| ---------------------------------------------------------------------
|**| DoDispose()
|**| This routine is called when a window needs to be disposed of.
|**| ---------------------------------------------------------------------
\**/
void DoDispose (WindowPtr wind)
{
    TH_Doc    doc;

// You should always dispose of your GX graphics objects before tossing your window.
// Why?  It's generally good form and this approach guarantees that everything is
// disposed.  If you had not disposed of everything, the call to DisposeWindow should
// dispose of the objects. If you are running the debugging version of QuickDraw GX
// with notices set, you will receive a notice that you had not disposed of everything.
// You can turn notices on in this file by setting gDebugging = TRUE (above).

    if ( wind != NULL )
    {
        doc = (TH_Doc)GetWRefCon(wind);        // Remember, this is where we stored our private data.
        GXDisposeShape(GetDocShape(wind));     // Dispose of this doc's shape.
        GXDisposeJob(GetDocJob(wind));        // Dispose of this doc's print job.
        DisposHandle((Handle) doc);            // Dispose of our private data.
        DisposeWindow(wind);                // Dispose of the window.
    }
}


/**\
|**| ---------------------------------------------------------------------
|**| DoIdle()
|**| This routine is called to do things while idling through the event loop.
|**| ---------------------------------------------------------------------
\**/
void DoIdle (WindowPtr wind)
{
}


/**\
|**| ---------------------------------------------------------------------
|**| DoTeardown()
|**| This routine is called just before we quit to remove anything
|**| persistent that might have been setup by DoSetup().
|**| ---------------------------------------------------------------------
\**/
void DoTeardown (void)
{
    DisposeRoutineDescriptor(gOurPrintingOverrideUPP);
}


/**\
|**| ---------------------------------------------------------------------
|**| DoClick()
|**| ---------------------------------------------------------------------
\**/
void DoClick(WindowPtr window, Point p)
{
}





/**\
|**| ---------------------------------------------------------------------
|**| DoWindowInit()
|**| In this function we create and initialize the the private document
|**| structure for a new window.  This structure contains the print job and
|**| the shape which is drawn in the window.  We store this data in a handle
|**| and hang it off the window's refCon field for easy retrieval.  By doing
|**| this, rather than using globals, we can create many windows containing
|**| unique print jobs and shapes.
|**| ---------------------------------------------------------------------
\**/
OSErr DoWindowInit (WindowPtr wind)
{
    OSErr    err = noErr;
    gxJob    docJob;
    gxShape    docPage;
    TH_Doc    windDoc;


// Create the page shape. We set the unique items attribute to make sure that each item
// added to the picture has a unique reference. If this attribute was not set, we would
// not see all copies of anything we add to the shape multiple times -- we'd just see
// the last version added.

    docPage = GXNewShape(gxPictureType);
    GXSetShapeAttributes(docPage, (GXGetShapeAttributes(docPage) | gxUniqueItemsShape));


// Create a print job for this document.  This will be the same as the system default until
// the user goes through the dialogs for Page Setup or Print…

    err = GXNewJob(&docJob);


// If there are no errors, create a handle the size of our document structure and store
// the print job and page shape in it.  Store the handle in the window's refCon field so
// that we can get at it.  (Note that the utility routines "GetDocJob" and "GetDocShape"
// can be used to do this easily.

    if ( err == noErr )
    {
        windDoc = (TH_Doc) NewHandleClear(sizeof(T_Doc));

        if ( windDoc == NULL )
            err = MemError();
        else
        {
            (*windDoc)->docJob = docJob;
            (*windDoc)->docPage = docPage;
            SetWRefCon(wind, (long) windDoc);
        }

// Now install our application override for PrintingEvent so that we can
// support the new movable-modal printing dialog boxes.

        GXInstallApplicationOverride(docJob, gxPrintingEvent, gOurPrintingOverrideUPP);

    }

    return err;
}


/**\
|**| ---------------------------------------------------------------------
|**| CreateSampleImage()
|**| This function creates primitive shapes and adds them to the window's page shape.
|**| ---------------------------------------------------------------------
\**/
void CreateSampleImage (WindowPtr wind)
{
    Rect    ourWindowRect = wind->portRect; // the rectangle for this window
                                            // in QuickDraw coordinates
    gxShape layout;                        // the layout shape we build
    gxShape highlight;                    // the highlight shape for the layout shape
    gxShape thePage;                    // this window's document shape
    gxRunControls runControls;            // run controls for the layout shape
    gxLayoutOptions layoutOptions;        // options for the layout shape
    gxStyle timesStyle;                    // a style record for a Times-based style
    gxStyle helveticaStyle;                // ditto for Helvetica
    gxStyle ramatganStyle;                 // ditto for Ramat Gan
    gxStyle textStyles[5];                // an array of text style for our text runs

// These are the five text runs for this layout shape, in pieces because they're
// in different languages

    char *text1 = "He said “";

// The following is "Macintosh" in Hebrew:
// meem, kouf, yod,  noon, teth, vav,  shin
// (This assumes the standard Hebrew character set for Macintosh, by the way)

    static char text2[] = {0xEE, 0xF7, 0xE9, 0xF0, 0xE8, 0xE5, 0xF9, 0};

    char *text3 = " (Macintosh) ";

// The following is "Hebrew" in Hebrew:
// beth, ayin, beth, rech, yoh,  tav
// Same character set assumptions.

    static char text4[] =    {0xE1, 0xF2, 0xE1, 0xF8, 0xE9, 0xFA, 0};

    char *text5 =         "” to me.";

    char *textRuns[5];                    // an array of pointers to text runs

    short textLengths[5];                // an array of the lengths of each run
    short totalLength;                    // the total length of the layout's text
    static short levelRunLengths[3];    // an array of the lengths of each level
    static short levels[3] = {0, 1, 0};    // the level numbers for each level

    gxPoint posn;                        // the position of the layout shape


// First, initialize the textRuns array to point to the five text runs

    textRuns[0] = text1;
    textRuns[1] = text2;
    textRuns[2] = text3;
    textRuns[3] = text4;
    textRuns[4] = text5;


// Next, initialize the textLengths and levelRunLengths arrays.  MyStrLength() is
// in this file.

    textLengths[0] = MyStrLength (text1);
    textLengths[1] = MyStrLength (text2);
    textLengths[2] = MyStrLength (text3);
    textLengths[3] = MyStrLength (text4);
    textLengths[4] = MyStrLength (text5);

// Our layout has three levels in it -- level 0 for the English runs at each end,
// and level 1 for the Hebrew text in the middle.  We need the byte-count for each
// level's text run in the levelRunLengths array.

    levelRunLengths[0] = textLengths[0];
    levelRunLengths[1] = textLengths[1] + textLengths[2] + textLengths[3];
    levelRunLengths[2] = textLengths[4];


// totalLength is the length of all the text.

    totalLength = levelRunLengths[0] + levelRunLengths[1] + levelRunLengths[2];


// make default gxLayoutOptions and gxRunControls structures

    InitializeLayoutOptions (&layoutOptions);
    InitializeRunControls (&runControls);


// Position the layout half way down the left edge of the window. Set
// the layout's width to the window's width and set the flushness to 1/2, this
// will cause the layout to center in the window.  Note that ourWindowRect is
// not in fixed coordinates, so we have to make it fixed to use it.

    layoutOptions.width = ff(ourWindowRect.right - ourWindowRect.left);
    layoutOptions.flush = fract1/2;

    posn.x = 0;
    posn.y = ff((ourWindowRect.bottom - ourWindowRect.top) / 2);


// Create the styles we'll use.  The helveticaStyle is 30-point Helvetica.
// NewLayoutStyle is a library routine found in layout library.c.  But first,
// this important message:

// When I was converting this sample to actually print, I found this strange
// problem that the highlight shape, while appearing correctly on the screen,
// was always too far to the right when printed -- sometimes overlapping parts
// of glyphs that shouldn't be highlighted.  An investigation was launched.
//
// It turns out that highlight shapes are pretty much always 72 DPI, because
// they're polygons calculated from the metrics of the layout shape when the
// highlight shape is created.  If you then scale the layout shape by
// transforming it to 300 DPI or so (like a printer driver would do), the
// highlight shape has the same geometry while hinting of the glyphs may have
// changed the way the layout shape looks.  They've moved a little bit, perhaps,
// and therefore the highlight shape isn't in the right place anymore.
//
// If this is for your on-screen work, you can recreate the highlight shape in
// a zoomed viewPort, but you don't get to make the printer driver do that for
// you.  So, instead, for each style run we use, we add the gxNoMetricsGridText
// attribute.  This prevents QuickDraw GX from using hinting, so the glyphs always
// scale the same way the highlight shape does, and all is well.
//
// (At first, I tried to fix this by adding gxNoMetricsGridShape to the layout
// _shape's_ attributes, but that's not the right idea.  The attributes in the
// shape's style affect any part of the layout that doesn't have a style of its
// own, including any parts of the text for which the entry in the style array
// is nil.  Since we're actually applying styles over the layout here, the
// gxNoMetricsGridText must be set in those styles, not in the shape's style.)
//
// This does mean that your glyphs won't get hinting at low resolutions and
// small point sizes where it might be desirable -- but it's really only a problem
// if you're trying to print a highlight shape, which doesn't happen very often.
// In fact, I can't really think of a legitimate reason to want to do it, except
// maybe in sample code.

    helveticaStyle = NewLayoutStyle(
        (char *) "\pHelvetica",                // the gxFontName for the style
        ff(30),                                // the text size in fixed point
        gxNoMetricsGridText,                // gxTextAttributes
        &runControls,                        // run controls (our default ones)
        nil,                                // run features (none for this style)
        0,                                    // count of run features
        nil);                                // style run overrides (none right now)

// The second style is ramatganStyle -- Ramat Gan (Hebrew), 36 points.

    ramatganStyle = NewLayoutStyle(
        (char *) "\pRamatgan",                // gxFontName
        ff(36),                                // text size (fixed point)
        gxNoMetricsGridText,                // gxTextAttributes
        &runControls,                        // run controls (our default ones)
        nil,                                 // run features (none)
        0,                                     // count of run features (none)
        nil);                                // style run overrides (none)

// The final style is 30-point Times Roman.

    timesStyle = NewLayoutStyle(
        (char *) "\pTimes Roman",             // gxFontName
        ff(30),                             // text size (fixed point)
        gxNoMetricsGridText,                // gxTextAttributes
        &runControls,                         // run controls (our default ones)
        nil,                                 // run features (none)
        0,                                     // count of run features (none)
        nil);                                // style run overrides (none)


// Initialize the textStyles array so that each of the five runs has the right style

    textStyles[0] = helveticaStyle;
    textStyles[1] = ramatganStyle;
    textStyles[2] = timesStyle;
    textStyles[3] = ramatganStyle;
    textStyles[4] = helveticaStyle;


// Setup complete!  Build the layout.

    layout = GXNewLayout(
        5,                                // count of text runs
        textLengths,                    // array of lengths of each run
        (void *) textRuns,                // array of pointers to the text
        5,                                // count of style runs
        textLengths,                    // array of the byte lengths of each run
        textStyles,                        // array of the styles
        3,                                // number of levels in the layout
        levelRunLengths,                // array of the lengths of each level
        levels,                            // array of the levels
        &layoutOptions,                    // options (default)
        &posn);                            // position of the layout shape


// Retrieve the page shape so we can add to it.

    thePage = GetDocShape(wind);

// Add the layout to the window's picture shape.  AddToShape is in shape library.c.

    AddToShape(thePage, layout);

// Make a highlight shape to highlight the layout from character 5 to character 20.
// This will go from the level 0 English text into the level 2 English text
// which is nested in the level 1 Hebrew text, and will produce a highlight shape
// consisting of three disjoint rectangles because the Hebrew text is displayed
// right-to-left.  SetShapeCommonTransfer is in transferMode library.c, and
// SetShapeCommonColor is in color library.c.

    highlight = GXGetLayoutHighlight(
        layout,                            // the layout shape to get the highlight from
        5, 20,                             // starting and ending byte offsets
        gxHighlightAverageAngle,         // highlight type -- use the average angle
        nil);                            // a shape to use if we have one around (we don't)

    SetShapeCommonTransfer (highlight, gxHighlightMode);
    SetShapeCommonColor (highlight, gxWhite);


    AddToShape(thePage, highlight);


// Dispose of what we allocated

    GXDisposeShape(highlight);
    GXDisposeShape(layout);
    GXDisposeStyle(helveticaStyle);
    GXDisposeStyle(ramatganStyle);
    GXDisposeStyle(timesStyle);


// Invalidate the window's portRect so that everything gets updated.

    SetPort(wind);
    InvalRect(&ourWindowRect);
}