游戏引擎

开发平台：
Visual C++

DynamicEdges.h：源码内容
							/*
* Copyright (c) 2006-2009 Erin Catto http://www.gphysics.com
*
* 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 DYNAMIC_EDGES_H
#define DYNAMIC_EDGES_H
class DynamicEdges : public Test
{
public:
	DynamicEdges()
	{
		{
			b2BodyDef bd;
			bd.position.Set(0.0f, -10.0f);
			b2Body* body = m_world->CreateBody(&bd);
			b2PolygonDef sd;
			sd.SetAsBox(50.0f, 10.0f);
			body->CreateFixture(&sd);
		}
		{
			b2CircleDef sd1;
			sd1.radius = 0.5f;
			sd1.localPosition.Set(-0.5f, 0.5f);
			sd1.density = 2.0f;
			b2CircleDef sd2;
			sd2.radius = 0.5f;
			sd2.localPosition.Set(0.5f, 0.5f);
			sd2.density = 0.0f; // massless
			for (int i = 0; i < 10; ++i)
			{
				float32 x = RandomFloat(-0.1f, 0.1f);
				b2BodyDef bd;
				bd.position.Set(x + 5.0f, 1.05f + 2.5f * i);
				bd.angle = RandomFloat(-b2_pi, b2_pi);
				b2Body* body = m_world->CreateBody(&bd);
				body->CreateFixture(&sd1);
				body->CreateFixture(&sd2);
				body->SetMassFromShapes();
			}
		}
		{
			b2PolygonDef sd1;
			sd1.SetAsBox(0.25f, 0.5f);
			sd1.density = 2.0f;
			b2PolygonDef sd2;
			sd2.SetAsBox(0.25f, 0.5f, b2Vec2(0.0f, -0.5f), 0.5f * b2_pi);
			sd2.density = 2.0f;
			for (int i = 0; i < 10; ++i)
			{
				float32 x = RandomFloat(-0.1f, 0.1f);
				b2BodyDef bd;
				bd.position.Set(x - 5.0f, 1.05f + 2.5f * i);
				bd.angle = RandomFloat(-b2_pi, b2_pi);
				b2Body* body = m_world->CreateBody(&bd);
				body->CreateFixture(&sd1);
				body->CreateFixture(&sd2);
				body->SetMassFromShapes();
			}
		}
		{
			b2XForm xf1;
			xf1.R.Set(0.3524f * b2_pi);
			xf1.position = b2Mul(xf1.R, b2Vec2(1.0f, 0.0f));
			b2PolygonDef sd1;
			sd1.vertexCount = 3;
			sd1.vertices[0] = b2Mul(xf1, b2Vec2(-1.0f, 0.0f));
			sd1.vertices[1] = b2Mul(xf1, b2Vec2(1.0f, 0.0f));
			sd1.vertices[2] = b2Mul(xf1, b2Vec2(0.0f, 0.5f));
			sd1.density = 2.0f;
			b2XForm xf2;
			xf2.R.Set(-0.3524f * b2_pi);
			xf2.position = b2Mul(xf2.R, b2Vec2(-1.0f, 0.0f));
			b2PolygonDef sd2;
			sd2.vertexCount = 3;
			sd2.vertices[0] = b2Mul(xf2, b2Vec2(-1.0f, 0.0f));
			sd2.vertices[1] = b2Mul(xf2, b2Vec2(1.0f, 0.0f));
			sd2.vertices[2] = b2Mul(xf2, b2Vec2(0.0f, 0.5f));
			sd2.density = 2.0f;
			for (int32 i = 0; i < 10; ++i)
			{
				float32 x = RandomFloat(-0.1f, 0.1f);
				b2BodyDef bd;
				bd.position.Set(x, 2.05f + 2.5f * i);
				bd.angle = 0.0f;
				b2Body* body = m_world->CreateBody(&bd);
				body->CreateFixture(&sd1);
				body->CreateFixture(&sd2);
				body->SetMassFromShapes();
			}
		}
		{
			b2PolygonDef sd_bottom;
			sd_bottom.SetAsBox( 1.5f, 0.15f );
			sd_bottom.density = 4.0f;
			b2PolygonDef sd_left;
			sd_left.SetAsBox(0.15f, 2.7f, b2Vec2(-1.45f, 2.35f), 0.2f);
			sd_left.density = 4.0f;
			b2PolygonDef sd_right;
			sd_right.SetAsBox(0.15f, 2.7f, b2Vec2(1.45f, 2.35f), -0.2f);
			sd_right.density = 4.0f;
			b2BodyDef bd;
			bd.position.Set( 0.0f, 2.0f );
			b2Body* body = m_world->CreateBody(&bd);
			body->CreateFixture(&sd_bottom);
			body->CreateFixture(&sd_left);
			body->CreateFixture(&sd_right);
			body->SetMassFromShapes();
		}
		
		{
			float32 loop1[] = 
			{
				0.063134534f,8.3695248f,
				0.94701801f,9.3165428f,
				0.0f,9.0640047f,
				-0.12626907f,10.326695f,
				1.4520943f,11.77879f,
				2.2728432f,10.137292f,
				2.3991123f,11.147444f,
				3.5986685f,10.958041f,
				3.9143411f,7.3593722f,
				4.1668793f,9.4428119f,
				5.4295699f,9.3165428f,
				6.2503189f,8.3063903f,
				6.6922606f,10.137292f,
				4.9876282f,9.8216191f,
				4.7350901f,10.958041f,
				7.2604714f,11.652521f,
				10.732871f,11.147444f,
				10.480333f,10.642368f,
				10.732871f,9.8216191f,
				11.55362f,9.4428119f,
				12.374369f,9.3796773f,
				13.005714f,9.8216191f,
				13.195118f,10.38983f,
				13.005714f,10.768637f,
				12.626907f,10.894906f,
				12.753176f,11.526252f,
				13.573925f,11.715655f,
				14.836616f,11.399982f,
				16.351844f,10.768637f,
				17.867073f,11.399982f,
				17.803939f,10.263561f,
				17.361997f,8.3063903f,
				17.803939f,8.1801212f,
				18.056477f,9.5059464f,
				18.182746f,11.336848f,
				18.561553f,11.210579f,
				18.561553f,9.6322155f,
				18.561553f,7.7381795f,
				18.687822f,5.5284708f,
				19.382302f,5.6547398f,
				19.066629f,8.1801212f,
				19.003495f,10.263561f,
				19.066629f,11.463117f,
				19.887378f,11.841924f,
				20.708127f,11.273713f,
				21.0238f,10.011023f,
				20.708127f,7.2962377f,
				21.086934f,6.2860852f,
				21.150069f,3.7607038f,
				20.392455f,2.5611476f,
				18.624688f,2.5611476f,
				20.771262f,2.1192059f,
				20.771262f,0.22516988f,
				18.624688f,-0.2799064f,
				13.826463f,0.16203534f,
				14.015867f,1.7403987f,
				13.195118f,2.1823404f,
				12.626907f,1.5509951f,
				12.879445f,0.85651522f,
				12.626907f,0.35143895f,
				10.543467f,1.298457f,
				11.490485f,3.9501074f,
				13.889598f,3.6344347f,
				13.889598f,2.9399549f,
				14.584077f,3.8869729f,
				11.932427f,5.2127981f,
				9.7227183f,4.0132419f,
				10.796005f,3.5081657f,
				9.7858528f,3.2556275f,
				10.796005f,2.4980131f,
				7.9549513f,1.7403987f,
				9.6595837f,1.424726f,
				9.217642f,0.66711162f,
				8.270624f,-0.090502792f,
				7.0079333f,0.85651522f,
				6.1240498f,-0.15363733f,
				6.1240498f,3.192493f,
				5.6821081f,2.4348786f,
				4.9876282f,2.1192059f,
				4.1037447f,1.8666678f,
				3.0304576f,1.8666678f,
				2.0834396f,2.245475f,
				1.6414979f,2.6242822f,
				1.3258252f,3.5081657f,
				1.2626907f,0.47770802f,
				0.63134534f,0.035766276f,
				0.063134534f,0.98278429f
			};
			
			float32 loop2[] = 
			{
				8.270624f,6.1598161f,
				8.270624f,5.3390672f,
				8.7757003f,5.086529f,
				9.4701801f,5.5284708f,
				9.217642f,6.033547f,
				8.7757003f,6.4123542f
			};
			
			b2Vec2 b2Loop1[87];
			b2Vec2 b2Loop2[6];
			
			for (int32 i = 86; i >= 0; i--) {
				b2Loop1[86 - i].Set(loop1[i*2] + 10.0f, loop1[i*2 + 1] + 1.0f);
			}
			/*for (int32 i = 0; i < 87; i++) {
				b2Loop1[i].Set(loop1[i*2] + 10.0f, loop1[i*2 + 1] + 1.0f);
			}*/
			
			for (int32 i = 0; i < 6; i++) {
				b2Loop2[i].Set(loop2[i*2], loop2[i*2 + 1]);
			}
			
			b2BodyDef bd;
			bd.position.Set( 0.0f, 0.0f );
			b2Body* body = m_world->CreateBody(&bd);
			
			b2CircleDef weight;
			weight.filter.maskBits = 0x0000;
			weight.density = 4.0f;
			weight.radius = 0.5f;
			weight.localPosition.Set(8.9f, 5.75f);
			body->CreateFixture(&weight);
			
			b2EdgeChainDef edgeDef;
			edgeDef.vertexCount = 6;
			edgeDef.vertices = b2Loop2;
			b2CreateEdgeChain(body, &edgeDef);
			
			body->SetMassFromShapes();
	
			body = m_world->CreateBody(&bd);
			weight.radius = 5.0f;
			weight.localPosition.Set(20.5f, 7.0f);
			body->CreateFixture(&weight);
			
			edgeDef.vertexCount = 87;
			edgeDef.vertices = b2Loop1;
			b2CreateEdgeChain(body, &edgeDef);
			
			body->SetMassFromShapes();
		}
	}
	static Test* Create()
	{
		return new DynamicEdges;
	}
};
#endif

						