iPhoneTest.mm
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上传日期:2022-01-07
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文件大小:9k
- /*
- * Copyright (c) 2006-2007 Erin Catto http://www.gphysics.com
- *
- * iPhone port by Simon Oliver - http://www.simonoliver.com - http://www.handcircus.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.
- */
- #include "iPhoneTest.h"
- #include "GLES-Render.h"
- #include <cstdio>
- void DestructionListener::SayGoodbye(b2Joint* joint)
- {
- if (test->m_mouseJoint == joint)
- {
- test->m_mouseJoint = NULL;
- }
- else
- {
- test->JointDestroyed(joint);
- }
- }
- Test::Test()
- : m_debugDraw()
- {
- b2Vec2 gravity;
- gravity.Set(0.0f, -10.0f);
- bool doSleep = true;
- m_world = new b2World(gravity, doSleep);
- m_bomb = NULL;
- m_textLine = 30;
- m_mouseJoint = NULL;
- m_pointCount = 0;
-
- m_destructionListener.test = this;
- m_world->SetDestructionListener(&m_destructionListener);
- m_world->SetContactListener(this);
- m_world->SetDebugDraw(&m_debugDraw);
-
- m_bombSpawning = false;
-
- m_stepCount = 0;
-
- b2BodyDef bodyDef;
- m_groundBody = m_world->CreateBody(&bodyDef);
- }
- Test::~Test()
- {
- // By deleting the world, we delete the bomb, mouse joint, etc.
- delete m_world;
- m_world = NULL;
-
- }
- void Test::SetGravity( float x, float y)
- {
- float tVectorLength=sqrt(x*x+y*y);
- float newGravityX=9.81f*x/tVectorLength;
- float newGravityY=9.81f*y/tVectorLength;
- m_world->SetGravity(b2Vec2(newGravityX,newGravityY));
- }
- void Test::PreSolve(b2Contact* contact, const b2Manifold* oldManifold)
- {
- const b2Manifold* manifold = contact->GetManifold();
-
- if (manifold->m_pointCount == 0)
- {
- return;
- }
-
- b2Fixture* fixtureA = contact->GetFixtureA();
- b2Fixture* fixtureB = contact->GetFixtureB();
-
- b2PointState state1[b2_maxManifoldPoints], state2[b2_maxManifoldPoints];
- b2GetPointStates(state1, state2, oldManifold, manifold);
-
- b2WorldManifold worldManifold;
- contact->GetWorldManifold(&worldManifold);
-
- for (int32 i = 0; i < manifold->m_pointCount && m_pointCount < k_maxContactPoints; ++i)
- {
- ContactPoint* cp = m_points + m_pointCount;
- cp->fixtureA = fixtureA;
- cp->fixtureB = fixtureB;
- cp->position = worldManifold.m_points[i];
- cp->normal = worldManifold.m_normal;
- cp->state = state2[i];
- ++m_pointCount;
- }
- }
- void Test::DrawTitle(int x, int y, const char *string)
- {
- m_debugDraw.DrawString(x, y, string);
- }
- class QueryCallback : public b2QueryCallback
- {
- public:
- QueryCallback(const b2Vec2& point)
- {
- m_point = point;
- m_fixture = NULL;
- }
-
- bool ReportFixture(b2Fixture* fixture)
- {
- b2Body* body = fixture->GetBody();
- if (body->GetType() == b2_dynamicBody)
- {
- bool inside = fixture->TestPoint(m_point);
- if (inside)
- {
- m_fixture = fixture;
-
- // We are done, terminate the query.
- return false;
- }
- }
-
- // Continue the query.
- return true;
- }
-
- b2Vec2 m_point;
- b2Fixture* m_fixture;
- };
- void Test::MouseDown(const b2Vec2& p)
- {
- m_mouseWorld = p;
-
- if (m_mouseJoint != NULL)
- {
- return;
- }
-
- // Make a small box.
- b2AABB aabb;
- b2Vec2 d;
- d.Set(0.001f, 0.001f);
- aabb.lowerBound = p - d;
- aabb.upperBound = p + d;
-
- // Query the world for overlapping shapes.
- QueryCallback callback(p);
- m_world->QueryAABB(&callback, aabb);
-
- if (callback.m_fixture)
- {
- b2Body* body = callback.m_fixture->GetBody();
- b2MouseJointDef md;
- md.bodyA = m_groundBody;
- md.bodyB = body;
- md.target = p;
- #ifdef TARGET_FLOAT32_IS_FIXED
- md.maxForce = (body->GetMass() < 16.0)?
- (1000.0f * body->GetMass()) : float32(16000.0);
- #else
- md.maxForce = 1000.0f * body->GetMass();
- #endif
- m_mouseJoint = (b2MouseJoint*)m_world->CreateJoint(&md);
- body->SetAwake(true);
- }
- }
- void Test::SpawnBomb(const b2Vec2& worldPt)
- {
- m_bombSpawnPoint = worldPt;
- m_bombSpawning = true;
- }
- void Test::CompleteBombSpawn(const b2Vec2& p)
- {
- if (m_bombSpawning == false)
- {
- return;
- }
-
- const float multiplier = 30.0f;
- b2Vec2 vel = m_bombSpawnPoint - p;
- vel *= multiplier;
- LaunchBomb(m_bombSpawnPoint,vel);
- m_bombSpawning = false;
- }
- void Test::ShiftMouseDown(const b2Vec2& p)
- {
- m_mouseWorld = p;
-
- if (m_mouseJoint != NULL)
- {
- return;
- }
-
- SpawnBomb(p);
- }
- void Test::MouseUp(const b2Vec2& p)
- {
- if (m_mouseJoint)
- {
- m_world->DestroyJoint(m_mouseJoint);
- m_mouseJoint = NULL;
- }
-
- if (m_bombSpawning)
- {
- CompleteBombSpawn(p);
- }
- }
- void Test::MouseMove(const b2Vec2& p)
- {
- m_mouseWorld = p;
-
- if (m_mouseJoint)
- {
- m_mouseJoint->SetTarget(p);
- }
- }
- void Test::LaunchBomb()
- {
- b2Vec2 p(RandomFloat(-15.0f, 15.0f), 30.0f);
- b2Vec2 v = -5.0f * p;
- LaunchBomb(p, v);
- }
- void Test::LaunchBomb(const b2Vec2& position, const b2Vec2& velocity)
- {
- if (m_bomb)
- {
- m_world->DestroyBody(m_bomb);
- m_bomb = NULL;
- }
-
- b2BodyDef bd;
- bd.type = b2_dynamicBody;
- bd.position = position;
- bd.bullet = true;
- m_bomb = m_world->CreateBody(&bd);
- m_bomb->SetLinearVelocity(velocity);
-
- b2CircleShape circle;
- circle.m_radius = 0.3f;
-
- b2FixtureDef fd;
- fd.shape = &circle;
- fd.density = 20.0f;
- fd.restitution = 0.1f;
-
- b2Vec2 minV = position - b2Vec2(0.3f,0.3f);
- b2Vec2 maxV = position + b2Vec2(0.3f,0.3f);
-
- b2AABB aabb;
- aabb.lowerBound = minV;
- aabb.upperBound = maxV;
-
- m_bomb->CreateFixture(&fd);
- }
- void Test::Step(Settings* settings)
- {
- float32 timeStep = settings->hz > 0.0f ? 1.0f / settings->hz : float32(0.0f);
-
- if (settings->pause)
- {
- if (settings->singleStep)
- {
- settings->singleStep = 0;
- }
- else
- {
- timeStep = 0.0f;
- }
-
- m_debugDraw.DrawString(5, m_textLine, "****PAUSED****");
- m_textLine += 15;
- }
-
- uint32 flags = 0;
- flags += settings->drawShapes * b2DebugDraw::e_shapeBit;
- flags += settings->drawJoints * b2DebugDraw::e_jointBit;
- flags += settings->drawAABBs * b2DebugDraw::e_aabbBit;
- flags += settings->drawPairs * b2DebugDraw::e_pairBit;
- flags += settings->drawCOMs * b2DebugDraw::e_centerOfMassBit;
- m_debugDraw.SetFlags(flags);
-
- m_world->SetWarmStarting(settings->enableWarmStarting > 0);
- m_world->SetContinuousPhysics(settings->enableContinuous > 0);
-
- m_pointCount = 0;
-
- m_world->Step(timeStep, settings->velocityIterations, settings->positionIterations, true);
-
- m_world->DrawDebugData();
-
- if (timeStep > 0.0f)
- {
- ++m_stepCount;
- }
-
- if (settings->drawStats)
- {
- m_debugDraw.DrawString(5, m_textLine, "bodies/contacts/joints/proxies = %d/%d/%d",
- m_world->GetBodyCount(), m_world->GetContactCount(), m_world->GetJointCount(), m_world->GetProxyCount());
- m_textLine += 15;
-
- m_debugDraw.DrawString(5, m_textLine, "heap bytes = %d", b2_byteCount);
- m_textLine += 15;
- }
-
- if (m_mouseJoint)
- {
- // b2Body* body = m_mouseJoint->GetBodyB();
- // b2Vec2 p1 = body->GetWorldPoint(m_mouseJoint->m_localAnchor);
- // b2Vec2 p2 = m_mouseJoint->m_target;
- //
- // glPointSize(4.0f);
- // glColor3f(0.0f, 1.0f, 0.0f);
- // glBegin(GL_POINTS);
- // glVertex2f(p1.x, p1.y);
- // glVertex2f(p2.x, p2.y);
- // glEnd();
- // glPointSize(1.0f);
- //
- // glColor3f(0.8f, 0.8f, 0.8f);
- // glBegin(GL_LINES);
- // glVertex2f(p1.x, p1.y);
- // glVertex2f(p2.x, p2.y);
- // glEnd();
- }
-
- if (m_bombSpawning)
- {
- // glPointSize(4.0f);
- // glColor3f(0.0f, 0.0f, 1.0f);
- // glBegin(GL_POINTS);
- // glColor3f(0.0f, 0.0f, 1.0f);
- // glVertex2f(m_bombSpawnPoint.x, m_bombSpawnPoint.y);
- // glEnd();
- //
- // glColor3f(0.8f, 0.8f, 0.8f);
- // glBegin(GL_LINES);
- // glVertex2f(m_mouseWorld.x, m_mouseWorld.y);
- // glVertex2f(m_bombSpawnPoint.x, m_bombSpawnPoint.y);
- // glEnd();
- }
-
- if (settings->drawContactPoints)
- {
- //const float32 k_impulseScale = 0.1f;
- const float32 k_axisScale = 0.3f;
-
- for (int32 i = 0; i < m_pointCount; ++i)
- {
- ContactPoint* point = m_points + i;
-
- if (point->state == b2_addState)
- {
- // Add
- m_debugDraw.DrawPoint(point->position, 10.0f, b2Color(0.3f, 0.95f, 0.3f));
- }
- else if (point->state == b2_persistState)
- {
- // Persist
- m_debugDraw.DrawPoint(point->position, 5.0f, b2Color(0.3f, 0.3f, 0.95f));
- }
-
- if (settings->drawContactNormals == 1)
- {
- b2Vec2 p1 = point->position;
- b2Vec2 p2 = p1 + k_axisScale * point->normal;
- m_debugDraw.DrawSegment(p1, p2, b2Color(0.4f, 0.9f, 0.4f));
- }
- else if (settings->drawContactForces == 1)
- {
- //b2Vec2 p1 = point->position;
- //b2Vec2 p2 = p1 + k_forceScale * point->normalForce * point->normal;
- //DrawSegment(p1, p2, b2Color(0.9f, 0.9f, 0.3f));
- }
-
- if (settings->drawFrictionForces == 1)
- {
- //b2Vec2 tangent = b2Cross(point->normal, 1.0f);
- //b2Vec2 p1 = point->position;
- //b2Vec2 p2 = p1 + k_forceScale * point->tangentForce * tangent;
- //DrawSegment(p1, p2, b2Color(0.9f, 0.9f, 0.3f));
- }
- }
- }
- }