axmol/tests/cpp-tests/Source/ChipmunkTestBed/demo/PyramidTopple.c

/* Copyright (c) 2007 Scott Lembcke
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include "chipmunk/chipmunk.h"
#include "ChipmunkDemo.h"

static void update(cpSpace* space, double dt)
{
    cpSpaceStep(space, dt);
}

#define WIDTH 4.0f
#define HEIGHT 30.0f

static void add_domino(cpSpace* space, cpVect pos, cpBool flipped)
{
    cpFloat mass   = 1.0f;
    cpFloat radius = 0.5f;
    cpFloat moment = cpMomentForBox(mass, WIDTH, HEIGHT);

    cpBody* body = cpSpaceAddBody(space, cpBodyNew(mass, moment));
    cpBodySetPosition(body, pos);

    cpShape* shape = (flipped ? cpBoxShapeNew(body, HEIGHT, WIDTH, 0.0)
                              : cpBoxShapeNew(body, WIDTH - radius * 2.0f, HEIGHT, radius));
    cpSpaceAddShape(space, shape);
    cpShapeSetElasticity(shape, 0.0f);
    cpShapeSetFriction(shape, 0.6f);
}

static cpSpace* init(void)
{
    cpSpace* space = cpSpaceNew();
    cpSpaceSetIterations(space, 30);
    cpSpaceSetGravity(space, cpv(0, -300));
    cpSpaceSetSleepTimeThreshold(space, 0.5f);
    cpSpaceSetCollisionSlop(space, 0.5f);

    // Add a floor.
    cpShape* shape =
        cpSpaceAddShape(space, cpSegmentShapeNew(cpSpaceGetStaticBody(space), cpv(-600, -240), cpv(600, -240), 0.0f));
    cpShapeSetElasticity(shape, 1.0f);
    cpShapeSetFriction(shape, 1.0f);
    cpShapeSetFilter(shape, NOT_GRABBABLE_FILTER);

    // Add the dominoes.
    int n = 12;
    for (int i = 0; i < n; i++)
    {
        for (int j = 0; j < (n - i); j++)
        {
            cpVect offset =
                cpv((j - (n - 1 - i) * 0.5f) * 1.5f * HEIGHT, (i + 0.5f) * (HEIGHT + 2 * WIDTH) - WIDTH - 240);
            add_domino(space, offset, cpFalse);
            add_domino(space, cpvadd(offset, cpv(0, (HEIGHT + WIDTH) / 2.0f)), cpTrue);

            if (j == 0)
            {
                add_domino(space, cpvadd(offset, cpv(0.5f * (WIDTH - HEIGHT), HEIGHT + WIDTH)), cpFalse);
            }

            if (j != n - i - 1)
            {
                add_domino(space, cpvadd(offset, cpv(HEIGHT * 0.75f, (HEIGHT + 3 * WIDTH) / 2.0f)), cpTrue);
            }
            else
            {
                add_domino(space, cpvadd(offset, cpv(0.5f * (HEIGHT - WIDTH), HEIGHT + WIDTH)), cpFalse);
            }
        }
    }

    return space;
}

static void destroy(cpSpace* space)
{
    ChipmunkDemoFreeSpaceChildren(space);
    cpSpaceFree(space);
}

ChipmunkDemo PyramidTopple = {
    "Pyramid Topple", 1.0 / 180.0, init, update, ChipmunkDemoDefaultDrawImpl, destroy,
};