axmol/tests/cpp-tests/Classes/BugsTest/Bug-1174.cpp

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//
// Bug-1174
// http://code.google.com/p/cocos2d-iphone/issues/detail?id=1174
//

#include "Bug-1174.h"

USING_NS_CC;

int check_for_error(Vec2 p1, Vec2 p2, Vec2 p3, Vec2 p4, float s, float t);

int check_for_error(Vec2 p1, Vec2 p2, Vec2 p3, Vec2 p4, float s, float t)
{
    //    the hit point is        p3 + t * (p4 - p3);
    //    the hit point also is    p1 + s * (p2 - p1);

    auto p4_p3     = p4 - p3;
    auto p4_p3_t   = p4_p3 * t;
    auto hitPoint1 = p3 + p4_p3_t;

    auto p2_p1     = p2 - p1;
    auto p2_p1_s   = p2_p1 * s;
    auto hitPoint2 = p1 + p2_p1_s;

    // Since float has rounding errors, only check if diff is < 0.05
    if ((fabs(hitPoint1.x - hitPoint2.x) > 0.1f) || (fabs(hitPoint1.y - hitPoint2.y) > 0.1f))
    {
        log("ERROR: (%f,%f) != (%f,%f)", hitPoint1.x, hitPoint1.y, hitPoint2.x, hitPoint2.y);
        return 1;
    }

    return 0;
}

bool Bug1174Layer::init()
{
    if (BugsTestBase::init())
    {
        //         // seed
        //         std::srand(0);

        Vec2 A, B, C, D, p1, p2, p3, p4;
        float s, t;

        int err = 0;
        int ok  = 0;

        //
        // Test 1.
        //
        log("Test1 - Start");
        for (int i = 0; i < 10000; i++)
        {
            // A | b
            // -----
            // c | d
            float ax = CCRANDOM_0_1() * -5000;
            float ay = CCRANDOM_0_1() * 5000;

            // a | b
            // -----
            // c | D
            float dx = CCRANDOM_0_1() * 5000;
            float dy = CCRANDOM_0_1() * -5000;

            // a | B
            // -----
            // c | d
            float bx = CCRANDOM_0_1() * 5000;
            float by = CCRANDOM_0_1() * 5000;

            // a | b
            // -----
            // C | d
            float cx = CCRANDOM_0_1() * -5000;
            float cy = CCRANDOM_0_1() * -5000;

            A = Vec2(ax, ay);
            B = Vec2(bx, by);
            C = Vec2(cx, cy);
            D = Vec2(dx, dy);
            if (Vec2::isLineIntersect(A, D, B, C, &s, &t))
            {
                if (check_for_error(A, D, B, C, s, t))
                    err++;
                else
                    ok++;
            }
        }
        log("Test1 - End. OK=%i, Err=%i", ok, err);

        //
        // Test 2.
        //
        log("Test2 - Start");

        p1 = Vec2(220, 480);
        p2 = Vec2(304, 325);
        p3 = Vec2(264, 416);
        p4 = Vec2(186, 416);
        s  = 0.0f;
        t  = 0.0f;
        if (Vec2::isLineIntersect(p1, p2, p3, p4, &s, &t))
            check_for_error(p1, p2, p3, p4, s, t);

        log("Test2 - End");

        //
        // Test 3
        //
        log("Test3 - Start");

        ok  = 0;
        err = 0;
        for (int i = 0; i < 10000; i++)
        {
            // A | b
            // -----
            // c | d
            float ax = CCRANDOM_0_1() * -500;
            float ay = CCRANDOM_0_1() * 500;
            p1       = Vec2(ax, ay);

            // a | b
            // -----
            // c | D
            float dx = CCRANDOM_0_1() * 500;
            float dy = CCRANDOM_0_1() * -500;
            p2       = Vec2(dx, dy);

            //////

            float y = ay - ((ay - dy) / 2.0f);

            // a | b
            // -----
            // C | d
            float cx = CCRANDOM_0_1() * -500;
            p3       = Vec2(cx, y);

            // a | B
            // -----
            // c | d
            float bx = CCRANDOM_0_1() * 500;
            p4       = Vec2(bx, y);

            s = 0.0f;
            t = 0.0f;
            if (Vec2::isLineIntersect(p1, p2, p3, p4, &s, &t))
            {
                if (check_for_error(p1, p2, p3, p4, s, t))
                    err++;
                else
                    ok++;
            }
        }

        log("Test3 - End. OK=%i, err=%i", ok, err);
        return true;
    }

    return false;
}