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| 1 | #include <stdafx.h> | |
| 2 | #include<stdlib.h> | |
| 3 | #include <time.h> | |
| 4 | #include <GL\glut.h> | |
| 5 | #include<GL\GLU.h> | |
| 6 | ||
| 7 | #define MAX_PARTICLES 100 | |
| 8 | #define MAX_BOUNCE_COUNT 10 | |
| 9 | - | #define MAX_PARTICLE_AGE 10 |
| 9 | + | #define MAX_PARTICLE_AGE 50 |
| 10 | ||
| 11 | ||
| 12 | struct PARTICLE {
| |
| 13 | float X,Y,Z; // Current position | |
| 14 | float sX,sY,sZ; // Current Speed/Movement | |
| 15 | float tX,tY,tZ; // Target Speed/Movement | |
| 16 | float R,B,G; // Particle Colour | |
| 17 | bool Active; // Is particle Active | |
| 18 | int Age; // Age of the particle | |
| 19 | int MaxAge; // Maximum Age before particle dies | |
| 20 | int BounceCount; | |
| 21 | } Particles[MAX_PARTICLES]; | |
| 22 | ||
| 23 | void Init_Particles(); | |
| 24 | void Activate_Particles(); | |
| 25 | void Adjust_Particles(); | |
| 26 | void Render_Particles(); | |
| 27 | void prepare_GLscene(); | |
| 28 | void DrawGLscene(); | |
| 29 | void Reshape(GLsizei w, GLsizei h); | |
| 30 | ||
| 31 | ||
| 32 | int main(int argc, char** argv){
| |
| 33 | glutInit(&argc,argv); | |
| 34 | glutCreateWindow("Particle fountain");
| |
| 35 | prepare_GLscene(); | |
| 36 | glutDisplayFunc(DrawGLscene); | |
| 37 | //glutReshapeFunc(Reshape); | |
| 38 | glutMainLoop(); | |
| 39 | } | |
| 40 | ||
| 41 | ||
| 42 | void Init_Particles(){
| |
| 43 | int p; | |
| 44 | srand((int)time(NULL)); | |
| 45 | for(p=0; p<MAX_PARTICLES; p++){
| |
| 46 | Particles[p].Active = false; | |
| 47 | Particles[p].tX = 0.0f; | |
| 48 | Particles[p].tY = -0.1f; | |
| 49 | Particles[p].tZ = 0.0f; | |
| 50 | } | |
| 51 | } | |
| 52 | ||
| 53 | void Activate_Particles(){
| |
| 54 | int p; | |
| 55 | for(p=0; p<MAX_PARTICLES; p++){
| |
| 56 | if(!Particles[p].Active){
| |
| 57 | // Start the particle at 0,0,0 origin | |
| 58 | Particles[p].X = 0.0f; | |
| 59 | Particles[p].Y = 0.0f; | |
| 60 | Particles[p].Z = 0.0f; | |
| 61 | // The following lines set a random speed value | |
| 62 | Particles[p].sX = (((float)((rand() % 100) + 1)) / | |
| 63 | 1000.0f) - 0.05f; | |
| 64 | Particles[p].sY = (((float)((rand() % 100) + 50)) / | |
| 65 | 500.0f); | |
| 66 | Particles[p].sZ = (((float)((rand() % 100) + 1)) / | |
| 67 | 1000.0f) - 0.05f; | |
| 68 | // We also activate the particle | |
| 69 | Particles[p].Active = true; | |
| 70 | // Set it's Age to zero | |
| 71 | Particles[p].Age = 0; | |
| 72 | // We also assign a max age to the particles | |
| 73 | Particles[p].MaxAge = MAX_PARTICLE_AGE; | |
| 74 | // We Also reset the bouncecount to zero | |
| 75 | Particles[p].BounceCount = 0; | |
| 76 | return; | |
| 77 | } | |
| 78 | } | |
| 79 | } | |
| 80 | ||
| 81 | void Adjust_Particles(){
| |
| 82 | int p; | |
| 83 | for(p=0; p<MAX_PARTICLES; p++){
| |
| 84 | // We move the speed towards the target speed by 1/20 (5%) | |
| 85 | Particles[p].sX+= (Particles[p].tX - Particles[p].sX) / 20.0f; | |
| 86 | Particles[p].sY+= (Particles[p].tY - Particles[p].sY) / 20.0f; | |
| 87 | Particles[p].sZ+= (Particles[p].tZ - Particles[p].sZ) / 20.0f; | |
| 88 | // Then we adjust the position of | |
| 89 | // the particle by the new speed | |
| 90 | Particles[p].X+= Particles[p].sX; | |
| 91 | Particles[p].Y+= Particles[p].sY; | |
| 92 | Particles[p].Z+= Particles[p].sZ; | |
| 93 | // Now for the bounce code. | |
| 94 | if(Particles[p].Y < 0.0f){
| |
| 95 | Particles[p].Y = 0.0f; | |
| 96 | Particles[p].sY = -Particles[p].sY; | |
| 97 | Particles[p].BounceCount++; | |
| 98 | if(Particles[p].BounceCount > MAX_BOUNCE_COUNT){
| |
| 99 | Particles[p].Active = false; | |
| 100 | } | |
| 101 | } | |
| 102 | // And finally the age check | |
| 103 | Particles[p].Age++; | |
| 104 | if(Particles[p].Age > Particles[p].MaxAge){
| |
| 105 | Particles[p].Active = false; | |
| 106 | } | |
| 107 | } | |
| 108 | } | |
| 109 | ||
| 110 | void Render_Particles(){
| |
| 111 | int p; | |
| 112 | glBegin(GL_POINTS); | |
| 113 | for(p=0; p<MAX_PARTICLES; p++){
| |
| 114 | if(Particles[p].Active){
| |
| 115 | glColor4f(1.0f, 1.0f, 1.0f, 0.5f); | |
| 116 | glVertex3f(Particles[p].X, | |
| 117 | Particles[p].Y, | |
| 118 | Particles[p].Z); | |
| 119 | } | |
| 120 | } | |
| 121 | glEnd(); | |
| 122 | ||
| 123 | } | |
| 124 | ||
| 125 | void prepare_GLscene(){
| |
| 126 | Activate_Particles(); | |
| 127 | Adjust_Particles(); | |
| 128 | Render_Particles(); | |
| 129 | } | |
| 130 | ||
| 131 | void DrawGLscene(){
| |
| 132 | glTranslatef(0.0f, -0.05f, 0.0f); | |
| 133 | Render_Particles(); | |
| 134 | glFlush(); | |
| 135 | } | |
| 136 | ||
| 137 | void Reshape(GLsizei w,GLsizei h){
| |
| 138 | // resize viewport to new canvas size | |
| 139 | glViewport(0, 0, w, h); | |
| 140 | // change clipping region to have same w:h ratio as canvas | |
| 141 | glMatrixMode(GL_PROJECTION); | |
| 142 | glLoadIdentity(); | |
| 143 | ||
| 144 | if (w <= h) | |
| 145 | gluOrtho2D(-1.0, 1.0, -1.0 * h/w, 1.0 * h/w); | |
| 146 | else | |
| 147 | gluOrtho2D(-1.0 * w/h, 1.0 * w/h, -1.0, 1.0); | |
| 148 | } |
