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Viewing changes to tests/box2d/Testbed/Tests/EdgeShapes.h

  • Committer: Package Import Robot
  • Author(s): Sylvestre Ledru
  • Date: 2013-05-02 13:11:51 UTC
  • Revision ID: package-import@ubuntu.com-20130502131151-q8dvteqr1ef2x7xz
Tags: upstream-1.4.1~20130504~adb56cb
Import upstream version 1.4.1~20130504~adb56cb

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tests/box2d/Testbed/Tests/EdgeShapes.h
 
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/*
 
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* Copyright (c) 2006-2010 Erin Catto http://www.box2d.org
 
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*
 
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* This software is provided 'as-is', without any express or implied
 
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* warranty.  In no event will the authors be held liable for any damages
 
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* arising from the use of this software.
 
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* Permission is granted to anyone to use this software for any purpose,
 
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* including commercial applications, and to alter it and redistribute it
 
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* freely, subject to the following restrictions:
 
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* 1. The origin of this software must not be misrepresented; you must not
 
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* claim that you wrote the original software. If you use this software
 
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* in a product, an acknowledgment in the product documentation would be
 
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* appreciated but is not required.
 
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* 2. Altered source versions must be plainly marked as such, and must not be
 
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* misrepresented as being the original software.
 
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* 3. This notice may not be removed or altered from any source distribution.
 
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*/
 
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#ifndef EDGE_SHAPES_H
 
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#define EDGE_SHAPES_H
 
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class EdgeShapesCallback : public b2RayCastCallback
 
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{
 
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public:
 
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        EdgeShapesCallback()
 
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        {
 
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                m_fixture = NULL;
 
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        }
 
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        float32 ReportFixture(  b2Fixture* fixture, const b2Vec2& point,
 
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                const b2Vec2& normal, float32 fraction)
 
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        {
 
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                m_fixture = fixture;
 
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                m_point = point;
 
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                m_normal = normal;
 
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                return fraction;
 
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        }
 
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        b2Fixture* m_fixture;
 
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        b2Vec2 m_point;
 
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        b2Vec2 m_normal;
 
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};
 
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class EdgeShapes : public Test
 
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{
 
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public:
 
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        enum
 
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        {
 
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                e_maxBodies = 256
 
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        };
 
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        EdgeShapes()
 
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        {
 
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                // Ground body
 
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                {
 
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                        b2BodyDef bd;
 
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                        b2Body* ground = m_world->CreateBody(&bd);
 
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                        float32 x1 = -20.0f;
 
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                        float32 y1 = 2.0f * cosf(x1 / 10.0f * b2_pi);
 
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                        for (int32 i = 0; i < 80; ++i)
 
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                        {
 
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                                float32 x2 = x1 + 0.5f;
 
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                                float32 y2 = 2.0f * cosf(x2 / 10.0f * b2_pi);
 
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                                b2EdgeShape shape;
 
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                                shape.Set(b2Vec2(x1, y1), b2Vec2(x2, y2));
 
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                                ground->CreateFixture(&shape, 0.0f);
 
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                                x1 = x2;
 
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                                y1 = y2;
 
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                        }
 
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                }
 
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                {
 
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                        b2Vec2 vertices[3];
 
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                        vertices[0].Set(-0.5f, 0.0f);
 
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                        vertices[1].Set(0.5f, 0.0f);
 
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                        vertices[2].Set(0.0f, 1.5f);
 
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                        m_polygons[0].Set(vertices, 3);
 
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                }
 
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                {
 
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                        b2Vec2 vertices[3];
 
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                        vertices[0].Set(-0.1f, 0.0f);
 
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                        vertices[1].Set(0.1f, 0.0f);
 
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                        vertices[2].Set(0.0f, 1.5f);
 
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                        m_polygons[1].Set(vertices, 3);
 
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                }
 
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                {
 
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                        float32 w = 1.0f;
 
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                        float32 b = w / (2.0f + b2Sqrt(2.0f));
 
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                        float32 s = b2Sqrt(2.0f) * b;
 
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                        b2Vec2 vertices[8];
 
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                        vertices[0].Set(0.5f * s, 0.0f);
 
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                        vertices[1].Set(0.5f * w, b);
 
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                        vertices[2].Set(0.5f * w, b + s);
 
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                        vertices[3].Set(0.5f * s, w);
 
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                        vertices[4].Set(-0.5f * s, w);
 
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                        vertices[5].Set(-0.5f * w, b + s);
 
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                        vertices[6].Set(-0.5f * w, b);
 
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                        vertices[7].Set(-0.5f * s, 0.0f);
 
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                        m_polygons[2].Set(vertices, 8);
 
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                }
 
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                {
 
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                        m_polygons[3].SetAsBox(0.5f, 0.5f);
 
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                }
 
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                {
 
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                        m_circle.m_radius = 0.5f;
 
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                }
 
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                m_bodyIndex = 0;
 
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                memset(m_bodies, 0, sizeof(m_bodies));
 
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                m_angle = 0.0f;
 
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        }
 
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        void Create(int32 index)
 
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        {
 
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                if (m_bodies[m_bodyIndex] != NULL)
 
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                {
 
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                        m_world->DestroyBody(m_bodies[m_bodyIndex]);
 
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                        m_bodies[m_bodyIndex] = NULL;
 
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                }
 
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                b2BodyDef bd;
 
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                float32 x = RandomFloat(-10.0f, 10.0f);
 
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                float32 y = RandomFloat(10.0f, 20.0f);
 
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                bd.position.Set(x, y);
 
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                bd.angle = RandomFloat(-b2_pi, b2_pi);
 
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                bd.type = b2_dynamicBody;
 
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                if (index == 4)
 
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                {
 
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                        bd.angularDamping = 0.02f;
 
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                }
 
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                m_bodies[m_bodyIndex] = m_world->CreateBody(&bd);
 
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                if (index < 4)
 
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                {
 
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                        b2FixtureDef fd;
 
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                        fd.shape = m_polygons + index;
 
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                        fd.friction = 0.3f;
 
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                        fd.density = 20.0f;
 
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                        m_bodies[m_bodyIndex]->CreateFixture(&fd);
 
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                }
 
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                else
 
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                {
 
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                        b2FixtureDef fd;
 
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                        fd.shape = &m_circle;
 
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                        fd.friction = 0.3f;
 
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                        fd.density = 20.0f;
 
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                        m_bodies[m_bodyIndex]->CreateFixture(&fd);
 
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                }
 
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                m_bodyIndex = (m_bodyIndex + 1) % e_maxBodies;
 
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        }
 
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        void DestroyBody()
 
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        {
 
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                for (int32 i = 0; i < e_maxBodies; ++i)
 
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                {
 
172
                        if (m_bodies[i] != NULL)
 
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                        {
 
174
                                m_world->DestroyBody(m_bodies[i]);
 
175
                                m_bodies[i] = NULL;
 
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                                return;
 
177
                        }
 
178
                }
 
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        }
 
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181
        void Keyboard(unsigned char key)
 
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        {
 
183
                switch (key)
 
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                {
 
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                case '1':
 
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                case '2':
 
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                case '3':
 
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                case '4':
 
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                case '5':
 
190
                        Create(key - '1');
 
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                        break;
 
192
 
 
193
                case 'd':
 
194
                        DestroyBody();
 
195
                        break;
 
196
                }
 
197
        }
 
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199
        void Step(Settings* settings)
 
200
        {
 
201
                bool advanceRay = settings->pause == 0 || settings->singleStep;
 
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203
                Test::Step(settings);
 
204
                m_debugDraw.DrawString(5, m_textLine, "Press 1-5 to drop stuff");
 
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                m_textLine += 15;
 
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207
                float32 L = 25.0f;
 
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                b2Vec2 point1(0.0f, 10.0f);
 
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                b2Vec2 d(L * cosf(m_angle), -L * b2Abs(sinf(m_angle)));
 
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                b2Vec2 point2 = point1 + d;
 
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                EdgeShapesCallback callback;
 
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                m_world->RayCast(&callback, point1, point2);
 
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216
                if (callback.m_fixture)
 
217
                {
 
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                        m_debugDraw.DrawPoint(callback.m_point, 5.0f, b2Color(0.4f, 0.9f, 0.4f));
 
219
 
 
220
                        m_debugDraw.DrawSegment(point1, callback.m_point, b2Color(0.8f, 0.8f, 0.8f));
 
221
 
 
222
                        b2Vec2 head = callback.m_point + 0.5f * callback.m_normal;
 
223
                        m_debugDraw.DrawSegment(callback.m_point, head, b2Color(0.9f, 0.9f, 0.4f));
 
224
                }
 
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                else
 
226
                {
 
227
                        m_debugDraw.DrawSegment(point1, point2, b2Color(0.8f, 0.8f, 0.8f));
 
228
                }
 
229
 
 
230
                if (advanceRay)
 
231
                {
 
232
                        m_angle += 0.25f * b2_pi / 180.0f;
 
233
                }
 
234
        }
 
235
 
 
236
        static Test* Create()
 
237
        {
 
238
                return new EdgeShapes;
 
239
        }
 
240
 
 
241
        int32 m_bodyIndex;
 
242
        b2Body* m_bodies[e_maxBodies];
 
243
        b2PolygonShape m_polygons[4];
 
244
        b2CircleShape m_circle;
 
245
 
 
246
        float32 m_angle;
 
247
};
 
248
 
 
249
#endif