89 lines
1.8 KiB
C++
Executable File
89 lines
1.8 KiB
C++
Executable File
/*==================================================================
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| Name: Particle.cpp
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|===================================================================
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| Author: Ben Vinegar
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| Contact: benvinegar () hotmail ! com
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| Last Modified: 03/08/04
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| Overview: A single particle, currently only utilized by
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| CParticleEmitter. Public variables are for performance
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| reasons.
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| Usage: Instantiate a particle, set public variables, then call
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| Frame() every frame.
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| To do: TBA
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| More Information: TBA
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==================================================================*/
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#include "precompiled.h"
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#include "Particle.h"
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#include "timer.h"
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#include "ogl.h"
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#include <assert.h>
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CParticle::CParticle() :
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m_duration(0.0f),
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m_timeElapsedTotal(0.0f),
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m_position(0.0f, 0.0f, 0.0f),
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m_velocity(0.0f, 0.0f, 0.0f),
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m_gravity(0.0f, 0.0f, 0.0f)
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{
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m_timeOfLastFrame = get_time();
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// default white colour
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m_colour[0] = m_colour[1] = m_colour[2] = m_colour[3] = 1.0f;
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}
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CParticle::~CParticle()
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{
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}
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void CParticle::Init()
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{
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// calculate colour increment per second in order to fade to black
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m_colourInc[0] = - (m_colour[0] / m_duration);
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m_colourInc[1] = - (m_colour[1] / m_duration);
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m_colourInc[2] = - (m_colour[2] / m_duration);
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}
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void CParticle::Frame()
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{
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Update();
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Render();
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}
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void CParticle::Render()
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{
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assert(m_sprite);
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m_sprite->SetColour(m_colour);
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m_sprite->SetTranslation(m_position);
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m_sprite->Render();
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}
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void CParticle::Update()
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{
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float timeElapsed = float(get_time() - m_timeOfLastFrame);
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m_velocity += m_gravity * timeElapsed;
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m_position += m_velocity * timeElapsed;
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// fade colour
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m_colour[0] += m_colourInc[0] * timeElapsed;
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m_colour[1] += m_colourInc[1] * timeElapsed;
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m_colour[2] += m_colourInc[2] * timeElapsed;
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m_timeOfLastFrame = get_time();
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m_timeElapsedTotal += timeElapsed;
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}
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