Tools/TestWebKitAPI/Tests/WebCore/FloatQuadTests.cpp

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#include "config.h"

#include <WebCore/FloatQuad.h>
#include <WebCore/GeometryUtilities.h>
#include <wtf/text/TextStream.h>

namespace TestWebKitAPI {
using namespace WebCore;

static bool areApproximatelyEqual(float a, float b)
{
    return std::abs(a - b) < 0.001;
}

static void expectRotatedRect(const FloatPoint& center, const FloatSize& size, float angle, const RotatedRect& info)
{
    areApproximatelyEqual(info.angleInRadians, angle);
    areApproximatelyEqual(info.center.x(), center.x());
    areApproximatelyEqual(info.center.y(), center.y());
    areApproximatelyEqual(info.size.width(), size.width());
    areApproximatelyEqual(info.size.height(), size.height());
}

TEST(FloatQuad, RotatedBoundingRectForPoint)
{
    expectRotatedRect({ 1, -5 }, { 0, 0 }, 0, rotatedBoundingRectWithMinimumAngleOfRotation({
        FloatPoint(1, -5),
        FloatPoint(1, -5),
        FloatPoint(1, -5),
        FloatPoint(1, -5)
    }));
}

TEST(FloatQuad, RotatedBoundingRectForLineSegment)
{
    expectRotatedRect({ 0, -5 }, { 20, 0 }, 0, rotatedBoundingRectWithMinimumAngleOfRotation({
        FloatPoint(-10, -5),
        FloatPoint(10, -5),
        FloatPoint(10, -5),
        FloatPoint(-10, -5)
    }));
}

TEST(FloatQuad, RotatedBoundingRectForTriangle)
{
    expectRotatedRect({ 10, 0 }, { 40, 20 }, 0, rotatedBoundingRectWithMinimumAngleOfRotation({
        FloatPoint(-10, -10),
        FloatPoint(30, 0),
        FloatPoint(30, 0),
        FloatPoint(-10, 10)
    }));
}

TEST(FloatQuad, RotatedBoundingRectForTrapezoid)
{
    expectRotatedRect({ 25, 15 }, { 28.284, 14.142 }, 5.498, rotatedBoundingRectWithMinimumAngleOfRotation({
        FloatPoint(10, 20),
        FloatPoint(20, 10),
        FloatPoint(40, 10),
        FloatPoint(20, 30)
    }));

    expectRotatedRect({ 20, 25 }, { 26.83, 13.42 }, 1.107, rotatedBoundingRectWithMinimumAngleOfRotation({
        FloatPoint(20, 10),
        FloatPoint(30, 30),
        FloatPoint(20, 40),
        FloatPoint(10, 20)
    }));
}

TEST(FloatQuad, RotatedBoundingRectWithMinimumAngle)
{
    expectRotatedRect({ 20, -14.95 }, { 20, 10.1 }, 0, rotatedBoundingRectWithMinimumAngleOfRotation({
        FloatPoint(10, -20),
        FloatPoint(30, -19.9),
        FloatPoint(30, -9.9),
        FloatPoint(10, -10)
    }, 0.01));

    expectRotatedRect({ 20, -15.05 }, { 20, 10.1 }, 0, rotatedBoundingRectWithMinimumAngleOfRotation({
        FloatPoint(10, -20),
        FloatPoint(30, -20.1),
        FloatPoint(30, -10.1),
        FloatPoint(10, -10)
    }, 0.01));
}

static void checkIsEmpty(bool expectation, FloatQuad&& quad)
{
    EXPECT_TRUE(expectation == quad.isEmpty());
    if (expectation == quad.isEmpty())
        return;

    TextStream stream;
    stream << quad;
    WTFLogAlways("Expected quad: %s to be %s", stream.release().utf8().data(), expectation ? "empty" : "non-empty");
}

TEST(FloatQuad, IsEmpty)
{
    checkIsEmpty(true, { // Line segment.
        FloatPoint(0, 0),
        FloatPoint(0, 0),
        FloatPoint(0, 3),
        FloatPoint(0, 3),
    });

    checkIsEmpty(false, { // Triangle.
        FloatPoint(0, 1),
        FloatPoint(0, 0),
        FloatPoint(3, 3),
        FloatPoint(3, 3),
    });

    checkIsEmpty(false, { // Another triangle.
        FloatPoint(0, 0),
        FloatPoint(0, 0),
        FloatPoint(3, 3),
        FloatPoint(0, 3),
    });

    checkIsEmpty(true, { // Single point.
        FloatPoint(100, 100),
        FloatPoint(100, 100),
        FloatPoint(100, 100),
        FloatPoint(100, 100),
    });

    checkIsEmpty(true, { // Two line segments.
        FloatPoint(0, 0),
        FloatPoint(100, 100),
        FloatPoint(0, 0),
        FloatPoint(50, -100),
    });

    checkIsEmpty(true, { // 4 distinct but colinear points.
        FloatPoint(-1, -1),
        FloatPoint(0, 0),
        FloatPoint(1, 1),
        FloatPoint(3, 3),
    });
}

} // namespace TestWebKitAPI