25bd5d8adb
subrepo: subdir: "deps/juce" merged: "b13f9084e" upstream: origin: "https://github.com/essej/JUCE.git" branch: "sono6good" commit: "b13f9084e" git-subrepo: version: "0.4.3" origin: "https://github.com/ingydotnet/git-subrepo.git" commit: "2f68596"
296 lines
8.0 KiB
C++
296 lines
8.0 KiB
C++
/*
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* Copyright (c) 2006-2009 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 POLY_SHAPES_H
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#define POLY_SHAPES_H
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/// This tests stacking. It also shows how to use b2World::Query
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/// and b2TestOverlap.
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const int32 k_maxBodies = 256;
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/// This callback is called by b2World::QueryAABB. We find all the fixtures
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/// that overlap an AABB. Of those, we use b2TestOverlap to determine which fixtures
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/// overlap a circle. Up to 4 overlapped fixtures will be highlighted with a yellow border.
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class PolyShapesCallback : public b2QueryCallback
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{
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public:
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enum
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{
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e_maxCount = 4
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};
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PolyShapesCallback()
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{
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m_count = 0;
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}
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void DrawFixture(b2Fixture* fixture)
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{
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b2Color color(0.95f, 0.95f, 0.6f);
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const b2Transform& xf = fixture->GetBody()->GetTransform();
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switch (fixture->GetType())
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{
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case b2Shape::e_circle:
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{
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b2CircleShape* circle = (b2CircleShape*)fixture->GetShape();
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b2Vec2 center = b2Mul(xf, circle->m_p);
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float32 radius = circle->m_radius;
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m_debugDraw->DrawCircle(center, radius, color);
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}
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break;
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case b2Shape::e_polygon:
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{
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b2PolygonShape* poly = (b2PolygonShape*)fixture->GetShape();
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int32 vertexCount = poly->m_vertexCount;
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b2Assert(vertexCount <= b2_maxPolygonVertices);
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b2Vec2 vertices[b2_maxPolygonVertices];
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for (int32 i = 0; i < vertexCount; ++i)
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{
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vertices[i] = b2Mul(xf, poly->m_vertices[i]);
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}
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m_debugDraw->DrawPolygon(vertices, vertexCount, color);
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}
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break;
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default:
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break;
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}
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}
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/// Called for each fixture found in the query AABB.
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/// @return false to terminate the query.
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bool ReportFixture(b2Fixture* fixture)
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{
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if (m_count == e_maxCount)
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{
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return false;
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}
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b2Body* body = fixture->GetBody();
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b2Shape* shape = fixture->GetShape();
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bool overlap = b2TestOverlap(shape, 0, &m_circle, 0, body->GetTransform(), m_transform);
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if (overlap)
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{
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DrawFixture(fixture);
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++m_count;
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}
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return true;
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}
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b2CircleShape m_circle;
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b2Transform m_transform;
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b2Draw* m_debugDraw;
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int32 m_count;
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};
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class PolyShapes : public Test
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{
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public:
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PolyShapes()
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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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b2EdgeShape shape;
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shape.Set(b2Vec2(-40.0f, 0.0f), b2Vec2(40.0f, 0.0f));
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ground->CreateFixture(&shape, 0.0f);
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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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}
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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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bd.type = b2_dynamicBody;
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float32 x = RandomFloat(-2.0f, 2.0f);
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bd.position.Set(x, 10.0f);
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bd.angle = RandomFloat(-b2_pi, b2_pi);
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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.density = 1.0f;
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fd.friction = 0.3f;
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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.density = 1.0f;
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fd.friction = 0.3f;
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m_bodies[m_bodyIndex]->CreateFixture(&fd);
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}
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m_bodyIndex = (m_bodyIndex + 1) % k_maxBodies;
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}
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void DestroyBody()
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{
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for (int32 i = 0; i < k_maxBodies; ++i)
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{
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if (m_bodies[i] != NULL)
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{
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m_world->DestroyBody(m_bodies[i]);
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m_bodies[i] = NULL;
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return;
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}
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}
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}
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void Keyboard(unsigned char key)
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{
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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':
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Create(key - '1');
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break;
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case 'a':
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for (int32 i = 0; i < k_maxBodies; i += 2)
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{
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if (m_bodies[i])
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{
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bool active = m_bodies[i]->IsActive();
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m_bodies[i]->SetActive(!active);
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}
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}
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break;
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case 'd':
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DestroyBody();
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break;
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}
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}
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void Step(Settings* settings)
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{
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Test::Step(settings);
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PolyShapesCallback callback;
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callback.m_circle.m_radius = 2.0f;
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callback.m_circle.m_p.Set(0.0f, 1.1f);
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callback.m_transform.SetIdentity();
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callback.m_debugDraw = &m_debugDraw;
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b2AABB aabb;
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callback.m_circle.ComputeAABB(&aabb, callback.m_transform, 0);
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m_world->QueryAABB(&callback, aabb);
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b2Color color(0.4f, 0.7f, 0.8f);
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m_debugDraw.DrawCircle(callback.m_circle.m_p, callback.m_circle.m_radius, color);
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m_debugDraw.DrawString(5, m_textLine, "Press 1-5 to drop stuff");
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m_textLine += 15;
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m_debugDraw.DrawString(5, m_textLine, "Press 'a' to (de)activate some bodies");
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m_textLine += 15;
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m_debugDraw.DrawString(5, m_textLine, "Press 'd' to destroy a body");
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m_textLine += 15;
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}
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static Test* Create()
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{
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return new PolyShapes;
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}
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int32 m_bodyIndex;
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b2Body* m_bodies[k_maxBodies];
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b2PolygonShape m_polygons[4];
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b2CircleShape m_circle;
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};
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#endif
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