forked from 0ad/0ad
65 lines
1.4 KiB
C++
Executable File
65 lines
1.4 KiB
C++
Executable File
//***********************************************************
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//
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// Name: Particle.cpp
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// Last Update: 03/04/04
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// Author: Ben Vinegar
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//
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// Description: Particle class implementation
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//
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//***********************************************************
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#include "Particle.h"
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#include "time.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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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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void CParticle::Init() {
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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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Update();
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Render();
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}
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void CParticle::Render() {
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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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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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