45 lines
1.1 KiB
C++
45 lines
1.1 KiB
C++
// -*- C++ -*-
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#ifndef MBOSTOCK_ROOM_FORCE_H
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#define MBOSTOCK_ROOM_FORCE_H
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#include "physics/force.h"
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#include "physics/shape.h"
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#include "physics/vector.h"
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namespace mbostock {
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class Particle;
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class Shape;
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/**
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* Defines a force that applies to the player when the player intersects a
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* given shape. For example, this can be used to represent a fan blowing on
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* the player, which the force of the fan stronger near the fan blades,
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* falling off to zero outside of the fan's stream.
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*/
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class RoomForce : public UnaryForce {
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public:
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virtual const Shape& shape() const = 0;
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};
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/**
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* A simple room force that applies a constant force within an axis-aligned
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* box. More elaborate forces can be approximated by composing multiple (even
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* overlapping) constant room forces.
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*/
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class ConstantRoomForce : public RoomForce {
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public:
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ConstantRoomForce(const Vector& min, const Vector& max, const Vector& f);
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virtual const Shape& shape() const;
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virtual Vector force(const Particle& p);
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private:
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AxisAlignedBox box_;
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Vector force_;
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};
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}
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#endif
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