TouchGesture.cpp File Reference

#include "tools/viewer/TouchGesture.h"
#include "include/core/SkMatrix.h"
#include "include/core/SkTypes.h"
#include "include/private/base/SkDebug.h"
#include "include/private/base/SkFloatingPoint.h"
#include "src/base/SkTime.h"
#include <algorithm>
#include <cmath>

Go to the source code of this file.

Macros
#define	DISCRETIZE_TRANSLATE_TO_AVOID_FLICKER   true

Functions
static SkScalar	pin_max_fling (SkScalar speed)
static double	getseconds ()
static SkScalar	SkScalarSignNonZero (SkScalar x)
static void	unit_axis_align (SkVector *unit)
static bool	close_enough_for_jitter (float x0, float y0, float x1, float y1)
static SkScalar	center (float pos0, float pos1)

Variables
static const SkScalar	MAX_FLING_SPEED = SkIntToScalar(1500)
static const SkMSec	MAX_DBL_TAP_INTERVAL = 300
static const float	MAX_DBL_TAP_DISTANCE = 100
static const float	MAX_JITTER_RADIUS = 2

Macro Definition Documentation

DISCRETIZE_TRANSLATE_TO_AVOID_FLICKER

#define DISCRETIZE_TRANSLATE_TO_AVOID_FLICKER   true

Definition at line 19 of file TouchGesture.cpp.

Function Documentation

center()

static SkScalar center ( float  pos0, float  pos1  )

static

Definition at line 193 of file TouchGesture.cpp.

                                               {
    return (pos0 + pos1) * 0.5f;
}

close_enough_for_jitter()

static bool close_enough_for_jitter ( float  x0, float  y0, float  x1, float  y1  )

static

Definition at line 102 of file TouchGesture.cpp.

                                                                            {
    return  std::fabs(x0 - x1) <= MAX_JITTER_RADIUS &&
            std::fabs(y0 - y1) <= MAX_JITTER_RADIUS;
}

getseconds()

static double getseconds ( )

static

Definition at line 30 of file TouchGesture.cpp.

                           {
    return SkTime::GetMSecs() * 0.001;
}

pin_max_fling()

static SkScalar pin_max_fling ( SkScalar  speed )

static

Definition at line 23 of file TouchGesture.cpp.

                                              {
    if (speed > MAX_FLING_SPEED) {
        speed = MAX_FLING_SPEED;
    }
    return speed;
}

SkScalarSignNonZero()

static SkScalar SkScalarSignNonZero ( SkScalar  x )

static

Definition at line 36 of file TouchGesture.cpp.

                                                {
    SkScalar sign = SK_Scalar1;
    if (x < 0) {
        sign = -sign;
    }
    return sign;
}

unit_axis_align()

static void unit_axis_align ( SkVector *  unit )

static

Definition at line 44 of file TouchGesture.cpp.

                                            {
    const SkScalar TOLERANCE = SkDoubleToScalar(0.15);
    if (SkScalarAbs(unit->fX) < TOLERANCE) {
        unit->fX = 0;
        unit->fY = SkScalarSignNonZero(unit->fY);
    } else if (SkScalarAbs(unit->fY) < TOLERANCE) {
        unit->fX = SkScalarSignNonZero(unit->fX);
        unit->fY = 0;
    }
}

Variable Documentation

MAX_DBL_TAP_DISTANCE

const float MAX_DBL_TAP_DISTANCE = 100

static

Definition at line 98 of file TouchGesture.cpp.

MAX_DBL_TAP_INTERVAL

const SkMSec MAX_DBL_TAP_INTERVAL = 300

static

Definition at line 97 of file TouchGesture.cpp.

MAX_FLING_SPEED

const SkScalar MAX_FLING_SPEED = SkIntToScalar(1500)

static

Definition at line 21 of file TouchGesture.cpp.

MAX_JITTER_RADIUS

const float MAX_JITTER_RADIUS = 2

static

Definition at line 99 of file TouchGesture.cpp.