Welcher teil des Codes is für die Gravitation verantwortlich
Verfasst: 07.10.2013 19:04
hi , ich würde gerne so eine Gravitation in meinem Partikel system einbinden. Nun verstehe ich nicht ganz welcher Teil des Codes dafür zustandig ist.
Wäre nett wenn mir da wer helfen würde.
Grüße
video:
http://www.youtube.com/watch?v=TXY6NJm5se0
c++ code: von http://pastebin.com/SU5KG8TE
Wäre nett wenn mir da wer helfen würde.
Grüße
video:
http://www.youtube.com/watch?v=TXY6NJm5se0
c++ code: von http://pastebin.com/SU5KG8TE
Code: Alles auswählen
/*##############################################
## ##
## Program: Gravity simulation ##
## Author: Curcudel Eugen (GuessGen) ##
## E-mail: CurcudelEugen@gmail.com ##
## WebSite: http://GuessGen.wordpress.com ##
## ##
##############################################*/
#include <GL/glut.h>
#include <vector>
#include <cmath>
struct Particle {
float x;
float y;
float r;
float vx;
float vy;
float m;
float color[3];
};
struct Line {
float x1;
float y1;
float x2;
float y2;
} line;
void timer(int = 0);
void display();
void mouse(int, int, int, int);
void mouseMotion(int, int);
void addParticle(float, float, bool = true, float = 0, float = 0);
void removeParticles();
void keyboard(unsigned char, int, int);
int Mx, My, WIN;
bool PRESSED_LEFT = false, PRESSED_RIGHT = false,
PRESSED_MIDDLE = false, SPEED_PARTICLES = false;
std::vector<Particle> particles;
int main(int argc, char **argv)
{
Particle p;
//initial centered Huge mass particle
p.x = 0;
p.y = 0;
p.vx = p.vy = 0;
p.m = 10000;
p.r = 10;
p.color[0] = 1;
p.color[1] = 1;
p.color[2] = 0;
particles.push_back(p);
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB);
glutInitWindowSize(500, 500);
glutInitWindowPosition(50, 50);
WIN = glutCreateWindow("Gravity");
glClearColor(0, 0, 0, 1);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(-250.0, 250.0, 250.0, -250.0, 0, 1);
glutDisplayFunc(display);
glutMouseFunc(mouse);
glutMotionFunc(mouseMotion);
glutKeyboardFunc(keyboard);
timer();
glutMainLoop();
return 0;
}
void timer(int)
{
display();
if(PRESSED_LEFT && !SPEED_PARTICLES)
{
addParticle(10, 3); //add tiny particle
PRESSED_LEFT = false;
}
if(PRESSED_RIGHT)
{
addParticle(10000, 10, 0); //add huge particle
PRESSED_RIGHT = false;
}
if(PRESSED_MIDDLE)
removeParticles(); //remove all particles
for(int i = 0; i < particles.size(); i++)
{
Particle &p = particles[i];
bool not_fall = true;
for(int j = 0; j < particles.size(); j++)
{
if(j == i || p.m >= 10000) // we consider the 10000 as infinit (big mass) so this particles won't move
continue;
const Particle &p1 = particles[j];
float d = sqrt((p1.x - p.x)*(p1.x - p.x) + (p1.y - p.y)*(p1.y - p.y));
if(d > p1.r)
{
p.vx += 0.03 * p1.m / (d*d) * (p1.x - p.x)/d; //f = ma => a = f/m
p.vy += 0.03 * p1.m / (d*d) * (p1.y - p.y)/d;
}
else
not_fall = false;
}
if(not_fall)
{
p.x += p.vx;
p.y += p.vy;
}
else
particles.erase(particles.begin()+i);
}
glutTimerFunc(1, timer, 0);
}
void display()
{
glClear(GL_COLOR_BUFFER_BIT);
//draw the drag line
glColor3f(0, 0, 1);
glBegin(GL_LINES);
glVertex2f(line.x1, line.y1);
glVertex2f(line.x2, line.y2);
glEnd();
//draw particles
for(int i = 0; i < particles.size(); i++)
{
Particle &p = particles[i];
glColor3f(p.color[0], p.color[1], p.color[2]);
glBegin(GL_POLYGON);
for(float a = 0; a < 2*M_PI; a+=0.2)
glVertex2f(p.r*cos(a) + p.x, p.r*sin(a) + p.y);
glEnd();
}
glFlush();
glutSwapBuffers();
}
void mouse(int button, int state, int x, int y)
{
//set the coordinates
Mx = x - 250;
My = y - 250;
//add speed particles by line draging
if(SPEED_PARTICLES)
{
if(line.x2 != 0 && line.y2 != 0 && state == GLUT_UP && PRESSED_LEFT)
addParticle(100, 5, 1, line.x1 - line.x2, line.y1 - line.y2); //add a speed particle
else
{
line.x1 = line.x2 = Mx;
line.y1 = line.y2 = My;
}
}
//check which button is pressed
if(button == GLUT_LEFT_BUTTON)
PRESSED_LEFT = state == GLUT_DOWN;
else if(button == GLUT_RIGHT_BUTTON)
PRESSED_RIGHT = state == GLUT_DOWN;
else if(button == GLUT_MIDDLE_BUTTON)
PRESSED_MIDDLE = state == GLUT_DOWN;
}
void mouseMotion(int x, int y)
{
Mx = x - 250;
My = y - 250;
//end of line with draging
if(SPEED_PARTICLES && PRESSED_LEFT)
{
line.x2 = Mx;
line.y2 = My;
}
}
void addParticle(float m, float r, bool randColor, float vx, float vy)
{
Particle p;
p.x = Mx;
p.y = My;
p.vx = vx / 30; // /30 in case it is a speed particle,
p.vy = vy / 30; // slow down the speed a little
p.m = m;
p.r = r;
if(randColor)
{
p.color[0] = rand()%200 / 200.0;
p.color[1] = rand()%200 / 200.0;
p.color[2] = rand()%200 / 200.0;
}
else // if is huge particle make it yellow
{
p.color[0] = 1;
p.color[1] = 1;
p.color[2] = 0;
}
particles.push_back(p);
if(line.x1 != 0)
line.x1 = line.x2 = line.y1 = line.y2 = 0;
}
void removeParticles()
{
for(int i = 0; i < particles.size(); i++)
particles.pop_back();
}
void keyboard(unsigned char key, int x, int y)
{
switch(key)
{
case 's':
SPEED_PARTICLES = !SPEED_PARTICLES;
break;
case 27:
removeParticles();
glutDestroyWindow(WIN);
exit(0);
break;
}
}
