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https://github.com/love2d/love.git
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particles now rotate around their center
This commit is contained in:
bill@Ixion
@@ -1,73 +1,73 @@
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/**
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* Copyright (c) 2006-2009 LOVE Development Team
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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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*
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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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*
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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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#include "ParticleSystem.h"
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#include <SDL_opengl.h>
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/**
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* Copyright (c) 2006-2009 LOVE Development Team
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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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*
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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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*
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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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#include "ParticleSystem.h"
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#include <SDL_opengl.h>
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#include <cmath>
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#include <cstdlib>
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#include <cstring>
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namespace love
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{
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namespace graphics
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{
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namespace opengl
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{
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float calculate_variation(float inner, float outer, float var)
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{
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float low = inner - (outer/2.0f)*var;
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float high = inner + (outer/2.0f)*var;
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float r = (rand() / (float(RAND_MAX)+1));
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return low*(1-r)+high*r;
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}
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ParticleSystem::ParticleSystem(Image * sprite, unsigned int buffer) : pStart(0), pLast(0), pEnd(0), active(true), emissionRate(0),
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emitCounter(0), lifetime(-1), life(0), particleLifeMin(0), particleLifeMax(0),
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direction(0), spread(0), relative(false), speedMin(0), speedMax(0), gravityMin(0),
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gravityMax(0), radialAccelerationMin(0), radialAccelerationMax(0),
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tangentialAccelerationMin(0), tangentialAccelerationMax(0),
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sizeStart(1), sizeEnd(1), sizeVariation(0), rotationMin(0), rotationMax(0),
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spinStart(0), spinEnd(0), spinVariation(0)
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{
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this->sprite = sprite;
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sprite->retain();
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memset(colorStart, 255, 4);
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memset(colorEnd, 255, 4);
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setBufferSize(buffer);
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}
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ParticleSystem::~ParticleSystem()
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{
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if(this->sprite != 0)
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{
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this->sprite->release();
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this->sprite = 0;
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}
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if(pStart != 0)
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delete [] pStart;
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}
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#include <cstdlib>
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#include <cstring>
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namespace love
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{
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namespace graphics
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{
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namespace opengl
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{
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float calculate_variation(float inner, float outer, float var)
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{
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float low = inner - (outer/2.0f)*var;
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float high = inner + (outer/2.0f)*var;
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float r = (rand() / (float(RAND_MAX)+1));
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return low*(1-r)+high*r;
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}
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ParticleSystem::ParticleSystem(Image * sprite, unsigned int buffer) : pStart(0), pLast(0), pEnd(0), active(true), emissionRate(0),
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emitCounter(0), lifetime(-1), life(0), particleLifeMin(0), particleLifeMax(0),
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direction(0), spread(0), relative(false), speedMin(0), speedMax(0), gravityMin(0),
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gravityMax(0), radialAccelerationMin(0), radialAccelerationMax(0),
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tangentialAccelerationMin(0), tangentialAccelerationMax(0),
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sizeStart(1), sizeEnd(1), sizeVariation(0), rotationMin(0), rotationMax(0),
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spinStart(0), spinEnd(0), spinVariation(0)
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{
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this->sprite = sprite;
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sprite->retain();
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memset(colorStart, 255, 4);
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memset(colorEnd, 255, 4);
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setBufferSize(buffer);
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}
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ParticleSystem::~ParticleSystem()
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{
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if(this->sprite != 0)
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{
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this->sprite->release();
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this->sprite = 0;
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}
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if(pStart != 0)
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delete [] pStart;
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}
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void ParticleSystem::add()
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{
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if(isFull()) return;
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@@ -125,33 +125,33 @@ namespace opengl
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pLast++;
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}
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void ParticleSystem::remove(particle * p)
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{
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if(!isEmpty())
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{
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*p = *(--pLast);
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}
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}
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void ParticleSystem::setSprite(Image * image)
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{
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if(this->sprite != 0)
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{
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this->sprite->release();
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this->sprite = 0;
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}
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this->sprite = image;
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}
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void ParticleSystem::remove(particle * p)
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{
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if(!isEmpty())
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{
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*p = *(--pLast);
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}
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}
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void ParticleSystem::setSprite(Image * image)
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{
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if(this->sprite != 0)
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{
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this->sprite->release();
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this->sprite = 0;
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}
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this->sprite = image;
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}
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void ParticleSystem::setBufferSize(unsigned int size)
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{
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// delete previous data
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delete [] pStart;
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pLast = pStart = new particle[size];
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pEnd = pStart + size;
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{
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// delete previous data
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delete [] pStart;
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pLast = pStart = new particle[size];
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pEnd = pStart + size;
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}
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void ParticleSystem::setEmissionRate(int rate)
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@@ -393,6 +393,7 @@ namespace opengl
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glTranslatef(p->position[0],p->position[1],0.0f);
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glRotatef(p->rotation * 57.29578f, 0.0f, 0.0f, 1.0f); // rad * (180 / pi)
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glScalef(p->size,p->size,1.0f);
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glTranslatef(sprite->getWidth()*-0.5f,sprite->getHeight()*-0.5f,0.0f);
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sprite->draw(0,0, 0, 1, 1, 0, 0);
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glPopMatrix();
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@@ -404,20 +405,20 @@ namespace opengl
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}
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void ParticleSystem::update(float dt)
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{
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{
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// Traverse all particles and update.
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particle * p = pStart;
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// Make some more particles.
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if(active)
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{
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float rate = 1.0f / emissionRate; // the amount of time between each particle emit
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emitCounter += dt;
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while(emitCounter > rate)
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{
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add();
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emitCounter -= rate;
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}
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// Make some more particles.
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if(active)
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{
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float rate = 1.0f / emissionRate; // the amount of time between each particle emit
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emitCounter += dt;
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while(emitCounter > rate)
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{
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add();
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emitCounter -= rate;
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}
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/*int particles = (int)(emissionRate * dt);
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for(int i = 0; i != particles; i++)
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add();*/
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@@ -490,9 +491,9 @@ namespace opengl
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if(p >= pLast)
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return;
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} // else
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} // while
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}
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} // opengl
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} // graphics
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} // love
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} // while
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}
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} // opengl
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} // graphics
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} // love
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