Source/WebKit/chromium/tests/PlatformGestureCurveTest.cpp

/*
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#include "config.h"

#include "PlatformGestureCurve.h"

#include "ActivePlatformGestureAnimation.h"
#include "PlatformGestureCurveTarget.h"
#include "TouchFlingPlatformGestureCurve.h"
#include "WheelFlingPlatformGestureCurve.h"
#include <gtest/gtest.h>
#include <wtf/OwnPtr.h>

namespace {

using namespace WebCore;

class MockPlatformGestureCurveTarget : public PlatformGestureCurveTarget {
public:
    virtual void scrollBy(const IntPoint& delta)
    {
        m_cumulativeDelta = m_cumulativeDelta + delta;
    }

    IntPoint cumulativeDelta() const { return  m_cumulativeDelta; }
    void resetCumulativeDelta() { m_cumulativeDelta = IntPoint(); }

private:
    IntPoint m_cumulativeDelta;
};

TEST(PlatformGestureCurve, flingCurve)
{
    MockPlatformGestureCurveTarget target;
    OwnPtr<ActivePlatformGestureAnimation> animation = ActivePlatformGestureAnimation::create(WheelFlingPlatformGestureCurve::create(FloatPoint(100, 0)), &target);

    // Note: the expectations below are dependent on the value of sigma hard-coded in the Rayleigh
    //       curve. If sigma changes, these test expectations will also change.
    EXPECT_TRUE(animation->animate(0));
    EXPECT_TRUE(animation->animate(0.25));
    EXPECT_TRUE(animation->animate(0.45)); // Use non-uniform tick spacing.
    EXPECT_TRUE(animation->animate(0.75));
    EXPECT_TRUE(animation->animate(1000));
    EXPECT_FALSE(animation->animate(1001));
    // Since the Rayleigh CDF maxes out at 1, we expect the cumulative scroll increments to
    // match the input velocity parameter.
    EXPECT_NEAR(target.cumulativeDelta().x(), 100, 1);
    EXPECT_EQ(target.cumulativeDelta().y(), 0);

    // Test animation when not starting at t = 0.
    double baseTime = 42.42;
    animation = ActivePlatformGestureAnimation::create(WheelFlingPlatformGestureCurve::create(FloatPoint(100, 0)), &target);
    target.resetCumulativeDelta();

    EXPECT_TRUE(animation->animate(baseTime + 0.35));
    EXPECT_TRUE(animation->animate(baseTime + 1.35));
    EXPECT_TRUE(animation->animate(baseTime + 1000));
    EXPECT_FALSE(animation->animate(baseTime + 1001));
    EXPECT_NEAR(target.cumulativeDelta().x(), 100, 1);

    animation = ActivePlatformGestureAnimation::create(WheelFlingPlatformGestureCurve::create(FloatPoint(50, 150)), &target);
    target.resetCumulativeDelta();

    // Test animation with both horizontal and vertical scroll velocities.
    EXPECT_TRUE(animation->animate(0));
    EXPECT_TRUE(animation->animate(0.25));
    EXPECT_TRUE(animation->animate(0.45));
    EXPECT_TRUE(animation->animate(0.75));
    EXPECT_TRUE(animation->animate(1000));
    EXPECT_FALSE(animation->animate(1001));
    EXPECT_NEAR(target.cumulativeDelta().x(), 50, 1);
    EXPECT_NEAR(target.cumulativeDelta().y(), 150, 1);
}

TEST(PlatformGestureCurve, flingCurveTouch)
{
    double initialVelocity = 5000;
    MockPlatformGestureCurveTarget target;
    // Explicitly parametrized to make test non-brittle in face of
    // parameter changes.
    OwnPtr<ActivePlatformGestureAnimation> animation = ActivePlatformGestureAnimation::create(TouchFlingPlatformGestureCurve::create(FloatPoint(initialVelocity, 0), -5.70762e+03f, 1.72e+02f, 3.7e+00f, 1.3f), &target);

    // Note: the expectations below are dependent on the curve parameters hard
    // coded into the create call above.
    EXPECT_TRUE(animation->animate(0));
    EXPECT_TRUE(animation->animate(0.25));
    EXPECT_TRUE(animation->animate(0.45f)); // Use non-uniform tick spacing.
    EXPECT_TRUE(animation->animate(1));
    EXPECT_FALSE(animation->animate(1.5));
    EXPECT_NEAR(target.cumulativeDelta().x(), 1193, 1);
    EXPECT_EQ(target.cumulativeDelta().y(), 0);
}

} // namespace anonymous