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73 lines
2.2 KiB
73 lines
2.2 KiB
2 years ago
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#pragma once
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#include <cmath>
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#include <iostream>
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#include <vector>
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class Saw : public Test {
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protected:
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int num_lines;
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float displacement_scale;
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public:
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Saw()
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{
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m_world->SetGravity(b2Vec2(0, 0));
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float friction_coeff = 0.0;
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float restitution_coeff = 0.0;
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float density = 1.0f;
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// Define the box.
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{
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b2BodyDef boxBodyDef;
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boxBodyDef.type = b2_dynamicBody;
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boxBodyDef.bullet = true;
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boxBodyDef.position.Set(1, 2.5);
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b2Body* box = m_world->CreateBody(&boxBodyDef);
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box->SetLinearVelocity(b2Vec2(1, -10));
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b2PolygonShape boxShape;
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boxShape.SetAsBox(2, 0.5);
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b2Fixture* boxFixture = box->CreateFixture(&boxShape, density);
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boxFixture->SetFriction(friction_coeff);
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boxFixture->SetRestitution(restitution_coeff);
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}
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{
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b2BodyDef sawBodyDef;
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sawBodyDef.type = b2_staticBody;
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sawBodyDef.bullet = true;
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sawBodyDef.position.Set(0, 0);
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b2Body* saw = m_world->CreateBody(&sawBodyDef);
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b2ChainShape sawShape;
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std::vector<b2Vec2> sawPoints;
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const double delta_x = 1.0;
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for (double x = 0; x < 10; x += delta_x) {
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sawPoints.push_back(b2Vec2(x, 1));
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sawPoints.push_back(b2Vec2(x + delta_x, 0));
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}
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sawShape.CreateChain(&sawPoints.front(), sawPoints.size());
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b2Fixture* sawFixture = saw->CreateFixture(&sawShape, density);
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sawFixture->SetFriction(friction_coeff);
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sawFixture->SetRestitution(restitution_coeff);
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}
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}
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static Test* Create() { return new Saw(); }
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virtual void Step(Settings* settings) override
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{
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static bool firstCall = true;
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if (firstCall) {
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settings->enableSleep = false;
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settings->hz = 1 / 1e-1;
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settings->velocityIterations = 300;
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settings->positionIterations = 300;
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settings->drawContactPoints = true;
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settings->drawContactImpulse = true;
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firstCall = false;
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}
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Test::Step(settings);
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}
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};
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