/*

    File:       cubic.c

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*/

#include <unistd.h>           /* Needed for usleep() */

#include "globals.h"

#include "atsui.h"

#include "cubic.h"

static int segmentCount = 0;

static int moveToCount = 0;

static int lineToCount = 0;

static int curveToCount = 0;

// A word about filtering degenerate cases.

//

// Many glyphs will have lines of zero length.  These are called "degenerate contours",

// and they are not usually meant to be drawn.  Their purpose in most cases is to indicate

// special parts of the glyph, such as attachment points.

//

// Using the drawing code in this program, these will normally show up as dots.  However, the conditionals

// that have comments marking them as a "degenerate filter" are meant to filter out these zero-length

// segments.   The conditionals are triggered by the global flag "gFilterDegenerates", which is

// toggled via the "Filter Degenerate Cases" menu item.

//

// The ATSUI documentation has an example very similar to the code in this program, but it leaves

// out the degenerate filter for purposes of brevity.

// Handles a pen move operation for cubic (Type 1 / Postscript) outlines

//

OSStatus MyCubicMoveToProc(const Float32Point *pt, void *callBackDataPtr)

{

    // Adjust the point according to the glyph origin

    float x = ((MyCurveCallbackData *)callBackDataPtr)->origin.x + pt->x;

    float y = ((MyCurveCallbackData *)callBackDataPtr)->origin.y + pt->y;

    // Move to the point

    if (gUseCG) {

        y = ((MyCurveCallbackData *)callBackDataPtr)->windowHeight - y;

        CGContextMoveToPoint(gContext, x, y);

    }

    else {

        MoveTo(x, y);

    }

    // Keep track of the current pen position (used to filter degenerate cases)

    ((MyCurveCallbackData *)callBackDataPtr)->current.x = x;

    ((MyCurveCallbackData *)callBackDataPtr)->current.y = y;

    // Update counters and return

    if (gOutputNumOps) moveToCount++;

    return noErr;

}

// Handles a line drawing operation for cubic (Type 1 / Postscript) outlines

//

OSStatus MyCubicLineToProc(const Float32Point *pt, void *callBackDataPtr)

{

    // Adjust the point according to the glyph origin

    float x = ((MyCurveCallbackData *)callBackDataPtr)->origin.x + pt->x;

    float y = ((MyCurveCallbackData *)callBackDataPtr)->origin.y + pt->y;

    // Beginning of degenerate filter

    if ( ! (gFilterDegenerates && (x == ((MyCurveCallbackData *)callBackDataPtr)->current.x) && (y == ((MyCurveCallbackData *)callBackDataPtr)->current.y)) ) {

        // Draw a line to the point

        if (gUseCG) {

            // Use CoreGraphics

            y = ((MyCurveCallbackData *)callBackDataPtr)->windowHeight - y;

            CGContextAddLineToPoint(gContext, x, y);

        } 

        else {

            // Use QuickDraw

            LineTo(x, y);

            if (gAnimateQDSegments) {

                GrafPtr port;

                GetPort(&port);

                usleep(10000);

                QDFlushPortBuffer(port, NULL);

            }

        }

    } // End of degenerate filter

    // Keep track of the current pen position (used to filter degenerate cases)

    ((MyCurveCallbackData *)callBackDataPtr)->current.x = x;

    ((MyCurveCallbackData *)callBackDataPtr)->current.y = y;

    // Update counters and return

    if (gOutputNumSegments) segmentCount++;

    if (gOutputNumOps) lineToCount++;

    return noErr;

}

// Handles a curve drawing operation for cubic (Type 1 / Postscript) outlines

//

// The curve is a Bezier patch defined by two off-curve control points (pt1 and pt2), and an endpoint (pt3).

// The starting point is whatever the current pen position is.

//

OSStatus MyCubicCurveToProc(const Float32Point *pt1, const Float32Point *pt2, const Float32Point *pt3, void *callBackDataPtr)

{

    // Adjust the points according to the glyph origin

    float x1 = ((MyCurveCallbackData *)callBackDataPtr)->origin.x + pt1->x;

    float y1 = ((MyCurveCallbackData *)callBackDataPtr)->origin.y + pt1->y;

    float x2 = ((MyCurveCallbackData *)callBackDataPtr)->origin.x + pt2->x;

    float y2 = ((MyCurveCallbackData *)callBackDataPtr)->origin.y + pt2->y;

    float x3 = ((MyCurveCallbackData *)callBackDataPtr)->origin.x + pt3->x;

    float y3 = ((MyCurveCallbackData *)callBackDataPtr)->origin.y + pt3->y;

    // Draw a curve according to the points

    if (gUseCG) {

        // Use CoreGraphics to actually draw the curve

        y1 = ((MyCurveCallbackData *)callBackDataPtr)->windowHeight - y1;

        y2 = ((MyCurveCallbackData *)callBackDataPtr)->windowHeight - y2;

        y3 = ((MyCurveCallbackData *)callBackDataPtr)->windowHeight - y3;

        CGContextAddCurveToPoint(gContext, x1, y1, x2, y2, x3, y3);

    }

    else {

        // Use QuickDraw to simply draw a "connect the dot" representation of the curve

        LineTo(x3, y3);

        if (gAnimateQDSegments) {

            GrafPtr port;

            GetPort(&port);

            usleep(10000);

            QDFlushPortBuffer(port, NULL);

        }

    }

    // Keep track of the current pen position (used to filter degenerate cases)

    ((MyCurveCallbackData *)callBackDataPtr)->current.x = x3;

    ((MyCurveCallbackData *)callBackDataPtr)->current.y = y3;

    // Update counters and return

    if (gOutputNumSegments) segmentCount++;

    if (gOutputNumOps) curveToCount++;

    return noErr;

}

// Handles a close path operation for cubic (Type 1 / Postscript) outlines

//

OSStatus MyCubicClosePathProc(void * callBackDataPtr)

{

    if (gOutputNumSegments) {

        fprintf(stdout, "Numer of cubic curve segments was %d\n", segmentCount);

        fflush(stdout);

        segmentCount = 0;

    }

    if (gOutputNumOps) {

        fprintf(stdout, "Numer of cubic MoveTos was %d\n", moveToCount);

        fprintf(stdout, "Numer of cubic LineTos was %d\n", lineToCount);

        fprintf(stdout, "Numer of cubic CurveTos was %d\n", curveToCount);

        fflush(stdout);

        moveToCount = 0;

        lineToCount = 0;

        curveToCount = 0;

    }

    return noErr;

}