/*

    File:       quadratic.c

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*/

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

#include "globals.h"

#include "atsui.h"

#include "quadratic.h"

static int segmentCount = 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 line drawing operation for quadratic (TrueType) outlines

//

OSStatus MyQuadraticLineProc(const Float32Point *pt1, const Float32Point *pt2, 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;

    // Beginning of degenerate filter

    if ( ! (gFilterDegenerates && (x1 == x2) && (y1 == y2)) ) {

        // Draw a line according to the points

        if (gUseCG) {

            // Use CoreGraphics

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

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

            if ( ((MyCurveCallbackData *)callBackDataPtr)->first ) {

                // MoveTo can confuse CG's path handling if done when unnecessary.

                // Only do it at the beginning of each contour, and assume

                // the points are connected in order after that.

                CGContextMoveToPoint(gContext, x1, y1);

                ((MyCurveCallbackData *)callBackDataPtr)->first = false;

            }

            CGContextAddLineToPoint(gContext, x2, y2);

        }

        else {

            // Use QuickDraw

            MoveTo(x1, y1);

            LineTo(x2, y2);

            if (gAnimateQDSegments) {

                GrafPtr port;

                GetPort(&port);

                usleep(10000);

                QDFlushPortBuffer(port, NULL);

            }

        }

    } // End of degenerate filter

    // Update counters and return

    if (gOutputNumSegments) segmentCount++;

    if (gOutputNumOps) lineToCount++;

    return noErr;

}

// Handles a curve drawing operation for quadratic (TrueType) outlines

//

// The curve is a quadratic patch specified by a start point (pt1), and end point (pt2), and a single control point (controlPt)

//

OSStatus MyQuadraticCurveProc(const Float32Point *pt1, const Float32Point *controlPt, const Float32Point *pt2, 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 cpx = ((MyCurveCallbackData *)callBackDataPtr)->origin.x + controlPt->x;

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

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

        if ( ((MyCurveCallbackData *)callBackDataPtr)->first ) {

            CGContextMoveToPoint(gContext, x1, y1);

            ((MyCurveCallbackData *)callBackDataPtr)->first = false;

        }

        CGContextAddQuadCurveToPoint(gContext, cpx, cpy, x2, y2);

    }

    else {

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

        MoveTo(x1, y1);

        LineTo(x2, y2);

        if (gAnimateQDSegments) {

            GrafPtr port;

            GetPort(&port);

            usleep(10000);

            QDFlushPortBuffer(port, NULL);

        }

    }

    // Update counters and return

    if (gOutputNumSegments) segmentCount++;

    if (gOutputNumOps) curveToCount++;

    return noErr;

}

// Handles a new path operation for quadratic (TrueType) outlines

//

OSStatus MyQuadraticNewPathProc(void * callBackDataPtr)

{

    ((MyCurveCallbackData *)callBackDataPtr)->first = true;

    return noErr;

}

// Handles a close path operation for quadratic (TrueType) outlines

//

OSStatus MyQuadraticClosePathProc(void * callBackDataPtr)

{

    ((MyCurveCallbackData *)callBackDataPtr)->first = true;

    if (gOutputNumSegments) {

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

        fflush(stdout);

        segmentCount = 0;

    }

    if (gOutputNumOps) {

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

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

        fflush(stdout);

        lineToCount = 0;

        curveToCount = 0;

    }

    return noErr;

}