JUCE/examples/Assets/Box2DTests/DistanceTest.h

/*
* Copyright (c) 2006-2009 Erin Catto http://www.box2d.org
*
* This software is provided 'as-is', without any express or implied
* warranty.  In no event will the authors be held liable for any damages
* arising from the use of this software.
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, subject to the following restrictions:
* 1. The origin of this software must not be misrepresented; you must not
* claim that you wrote the original software. If you use this software
* in a product, an acknowledgment in the product documentation would be
* appreciated but is not required.
* 2. Altered source versions must be plainly marked as such, and must not be
* misrepresented as being the original software.
* 3. This notice may not be removed or altered from any source distribution.
*/

#ifndef DISTANCE_TEST_H
#define DISTANCE_TEST_H

class DistanceTest : public Test
{
public:
    DistanceTest()
    {
        {
            m_transformA.SetIdentity();
            m_transformA.p.Set(0.0f, -0.2f);
            m_polygonA.SetAsBox(10.0f, 0.2f);
        }

        {
            m_positionB.Set(12.017401f, 0.13678508f);
            m_angleB = -0.0109265f;
            m_transformB.Set(m_positionB, m_angleB);

            m_polygonB.SetAsBox(2.0f, 0.1f);
        }
    }

    static Test* Create()
    {
        return new DistanceTest;
    }

    void Step(Settings* settings)
    {
        Test::Step(settings);

        b2DistanceInput input;
        input.proxyA.Set(&m_polygonA, 0);
        input.proxyB.Set(&m_polygonB, 0);
        input.transformA = m_transformA;
        input.transformB = m_transformB;
        input.useRadii = true;
        b2SimplexCache cache;
        cache.count = 0;
        b2DistanceOutput output;
        b2Distance(&output, &cache, &input);

        m_debugDraw.DrawString(5, m_textLine, "distance = %g", output.distance);
        m_textLine += 15;

        m_debugDraw.DrawString(5, m_textLine, "iterations = %d", output.iterations);
        m_textLine += 15;

        {
            b2Color color(0.9f, 0.9f, 0.9f);
            b2Vec2 v[b2_maxPolygonVertices];
            for (int32 i = 0; i < m_polygonA.m_vertexCount; ++i)
            {
                v[i] = b2Mul(m_transformA, m_polygonA.m_vertices[i]);
            }
            m_debugDraw.DrawPolygon(v, m_polygonA.m_vertexCount, color);

            for (int32 i = 0; i < m_polygonB.m_vertexCount; ++i)
            {
                v[i] = b2Mul(m_transformB, m_polygonB.m_vertices[i]);
            }
            m_debugDraw.DrawPolygon(v, m_polygonB.m_vertexCount, color);
        }

        b2Vec2 x1 = output.pointA;
        b2Vec2 x2 = output.pointB;

        b2Color c1(1.0f, 0.0f, 0.0f);
        m_debugDraw.DrawPoint(x1, 4.0f, c1);

        b2Color c2(1.0f, 1.0f, 0.0f);
        m_debugDraw.DrawPoint(x2, 4.0f, c2);
    }

    void Keyboard(unsigned char key)
    {
        switch (key)
        {
        case 'a':
            m_positionB.x -= 0.1f;
            break;

        case 'd':
            m_positionB.x += 0.1f;
            break;

        case 's':
            m_positionB.y -= 0.1f;
            break;

        case 'w':
            m_positionB.y += 0.1f;
            break;

        case 'q':
            m_angleB += 0.1f * b2_pi;
            break;

        case 'e':
            m_angleB -= 0.1f * b2_pi;
            break;
        }

        m_transformB.Set(m_positionB, m_angleB);
    }

    b2Vec2 m_positionB;
    float32 m_angleB;

    b2Transform m_transformA;
    b2Transform m_transformB;
    b2PolygonShape m_polygonA;
    b2PolygonShape m_polygonB;
};

#endif