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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
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<h2>/quadratic.c</h2>
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<p><strong>View Source Code:</strong>
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<p><strong><a href="ATSUICurveAccessDemo.zip">Download Sample</a></strong> (“ATSUICurveAccessDemo.zip”, 105.6K)<BR>
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<pre class="sourcecodebox">/*
File: quadratic.c
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
use, installation, modification or redistribution of this Apple software
constitutes acceptance of these terms. If you do not agree with these terms,
please do not use, install, modify or redistribute this Apple software.
In consideration of your agreement to abide by the following terms, and subject
to these terms, Apple grants you a personal, non-exclusive license, under Apple's
copyrights in this original Apple software (the "Apple Software"), to use,
reproduce, modify and redistribute the Apple Software, with or without
modifications, in source and/or binary forms; provided that if you redistribute
the Apple Software in its entirety and without modifications, you must retain
this notice and the following text and disclaimers in all such redistributions of
the Apple Software. Neither the name, trademarks, service marks or logos of
Apple Computer, Inc. may be used to endorse or promote products derived from the
Apple Software without specific prior written permission from Apple. Except as
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
COMBINATION WITH YOUR PRODUCTS.
IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, MODIFICATION AND/OR DISTRIBUTION
OF THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER UNDER THEORY OF CONTRACT, TORT
(INCLUDING NEGLIGENCE), STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN
ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Copyright © 2002 Apple Computer, Inc., All Rights Reserved
*/
#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;
}</pre>
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