reworked reset and particle initialization to assure particle will always be centered

Author: Syntaf

src/particlemanager.cpp

@@ -50,12 +50,22 @@ ParticleManager::~ParticleManager()
 
 void ParticleManager::initParticles()
 {
-    for(int i=0; i<(int)sqrt(d_MAXPARTICLES); i++) {
-        for(int j=0; j<(int)sqrt(d_MAXPARTICLES); j++) {
+	int max_particles = (int)sqrt(d_MAXPARTICLES);
+    for(int i=0; i<max_particles; i++) {
+        for(int j=0; j<max_particles; j++) {
+			//create single particle and place it in allignment with other particles to form
+			//a square
             Particle particle;
-            glm::vec2 d2Pos = glm::vec2(j*0.06, i*0.06) + glm::vec2(-17.0f,-17.0f);
+			auto factor_x = (i - (float)max_particles / 2.0f) / (float)max_particles;
+			auto factor_y = (j - (float)max_particles / 2.0f) / (float)max_particles;
+
+			//multiply by arbitrary constant
+			glm::vec2 particle_locale_delta = glm::vec2(30  * factor_x, 30 * factor_y);
+			glm::vec2 d2Pos = glm::vec2(0, 0);
+			d2Pos += particle_locale_delta;
             particle.pos = glm::vec3(d2Pos.x,d2Pos.y,-70);
 
+			//set particle constants
             particle.life = 1000.0f;
             particle.cameradistance = -1.0f;
 
@@ -366,11 +376,20 @@ void ParticleManager::setColorRand(const int& val)
 void ParticleManager::resetParticles()
 {
     d_particles_container.clear();
-    for(int i=0; i<(int)sqrt(d_MAXPARTICLES); i++) {
-        for(int j=0; j<(int)sqrt(d_MAXPARTICLES); j++) {
-            Particle particle;
-            glm::vec2 d2Pos = glm::vec2(j*0.06, i*0.06) + glm::vec2(-20.0f,-20.0f);
-            particle.pos = glm::vec3(d2Pos.x,d2Pos.y,-70);
+	int max_particles = (int)sqrt(d_MAXPARTICLES);
+    for(int i=0; i<max_particles; i++) {
+        for(int j=0; j<max_particles; j++) {
+			//create single particle and place it in allignment with other particles to form
+			//a square
+			Particle particle;
+			auto factor_x = (i - (float)max_particles / 2.0f) / (float)max_particles;
+			auto factor_y = (j - (float)max_particles / 2.0f) / (float)max_particles;
+
+			//multiply by arbitrary constant
+			glm::vec2 particle_locale_delta = glm::vec2(30 * factor_x, 30 * factor_y);
+			glm::vec2 d2Pos = glm::vec2(0, 0);
+			d2Pos += particle_locale_delta;
+			particle.pos = glm::vec3(d2Pos.x, d2Pos.y, -70);
 
             particle.life = 1000.0f;
             particle.cameradistance = -1.0f;