kis_paintop.cc File Reference

#include "kis_paintop.h"
#include <QtMath>
#include <KoColor.h>
#include <KoColorSpace.h>
#include <KoPointerEvent.h>
#include "kis_painter.h"
#include "kis_layer.h"
#include "kis_image.h"
#include "kis_paint_device.h"
#include "kis_global.h"
#include "kis_datamanager.h"
#include <brushengine/kis_paintop_preset.h>
#include <brushengine/kis_paint_information.h>
#include "kis_vec.h"
#include "kis_perspective_math.h"
#include "kis_fixed_paint_device.h"
#include "kis_paintop_utils.h"
#include <kis_distance_information.h>
#include <qnumeric.h>

Go to the source code of this file.

Classes
class	KisPaintOp

Macros
#define	BEZIER_FLATNESS_THRESHOLD   0.5

Functions
static void	paintBezierCurve (KisPaintOp *paintOp, const KisPaintInformation &pi1, const KisVector2D &control1, const KisVector2D &control2, const KisPaintInformation &pi2, KisDistanceInformation *currentDistance)

Macro Definition Documentation

BEZIER_FLATNESS_THRESHOLD

#define BEZIER_FLATNESS_THRESHOLD   0.5

Definition at line 34 of file kis_paintop.cc.

Function Documentation

paintBezierCurve()

static void paintBezierCurve ( KisPaintOp * paintOp, const KisPaintInformation & pi1, const KisVector2D & control1, const KisVector2D & control2, const KisPaintInformation & pi2, KisDistanceInformation * currentDistance )

static

Definition at line 98 of file kis_paintop.cc.

{
    LineEquation line = LineEquation::Through(toKisVector2D(pi1.pos()), toKisVector2D(pi2.pos()));
    qreal d1 = line.absDistance(control1);
    qreal d2 = line.absDistance(control2);
 
    if ((d1 < BEZIER_FLATNESS_THRESHOLD && d2 < BEZIER_FLATNESS_THRESHOLD)
            || qIsNaN(d1) || qIsNaN(d2)) {
        paintOp->paintLine(pi1, pi2, currentDistance);
    } else {
        // Midpoint subdivision. See Foley & Van Dam Computer Graphics P.508
        KisVector2D l2 = (toKisVector2D(pi1.pos()) + control1) / 2;
        KisVector2D h = (control1 + control2) / 2;
        KisVector2D l3 = (l2 + h) / 2;
        KisVector2D r3 = (control2 + toKisVector2D(pi2.pos())) / 2;
        KisVector2D r2 = (h + r3) / 2;
        KisVector2D l4 = (l3 + r2) / 2;
 
        KisPaintInformation middlePI = KisPaintInformation::mix(toQPointF(l4), 0.5, pi1, pi2);
 
        paintBezierCurve(paintOp, pi1, l2, l3, middlePI, currentDistance);
        paintBezierCurve(paintOp, middlePI, r2, r3, pi2, currentDistance);
    }
}

References BEZIER_FLATNESS_THRESHOLD, KisPaintInformation::mix(), paintBezierCurve(), KisPaintOp::paintLine(), KisPaintInformation::pos(), r2, r3, toKisVector2D(), and toQPointF().