visual animation points in OpenGL with C++?
visual animation points in OpenGL with C++?
我尝试在3D,但我是一个初学者,所以我尝试做与2D和z = 0的值。我有一个数组点的值随机在数组点[]使用std::vector。我有函数Distance(…)和CaculateF(…)来计算点[]的新值并存储在数组pnew[]中。我需要绘制点[]并将它们移动到pnew[]的值,但我只知道首先在数组点[]中绘制随机点,我无法将它们精确地移动到pnew[]中的值。有人能帮帮我吗?!
#include<stdlib.h>
#include<glut.h>
#include<iostream>
#include<conio.h>
#include<math.h>
#include<omp.h>
#include<time.h>
#include<Windows.h>
#include<vector>
using namespace std;
struct Point
{
float x, y , z;
float vx, vy, vz;
unsigned long m;
unsigned char r, g, b, a;
};
vector< Point > points, pnew;
void animation_points( int value )
{
// move all points left each frame
for( size_t i = 0; i < points.size(); ++i )
{
points[i].x -= 1;
// wrap point around if it's moved off
// the edge of our 100x100 area
if( points[i].x < -50 )
{
points[i].x = 100 + points[i].x;
}
}
glutPostRedisplay();
glutTimerFunc(30, animation_points, 1);
}
void display(void)
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(-50, 50, -50, 50, -1, 1);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
// draw
glColor3ub( 255, 255, 255 );
glEnableClientState( GL_VERTEX_ARRAY );
glEnableClientState( GL_COLOR_ARRAY );
glVertexPointer( 2, GL_FLOAT, sizeof(Point), &points[0].x );
glColorPointer( 4, GL_UNSIGNED_BYTE, sizeof(Point), &points[0].r );
glPointSize( 3.0 );
glDrawArrays( GL_POINTS, 0, points.size() );
glDisableClientState( GL_VERTEX_ARRAY );
glDisableClientState( GL_COLOR_ARRAY );
glFlush();
glutSwapBuffers();
}
void reshape(int w, int h)
{
glViewport(0, 0, w, h);
}
//Distance between i and j
float Distance(float x1,float y1, float z1, float x2, float y2, float z2)
{
return (sqrt(pow(x1-x2,2) + pow(y1-y2,2) + pow(z1-z2,2)));
}
//Value of F on Ox, Oy, Oz
Point CalculateF(double d, Point a, Point b, int dt)
{
Point F;
float vnewx, vnewy, vnewz, xnew , ynew, znew;
float G = 6.6742*pow(10,-11);
float Fx = (G*a.m*b.m/pow(d,2)*(a.x-b.x)/d);
float Fy = (G*a.m*b.m/pow(d,2)*(a.y-b.y)/d);
float Fz = (G*a.m*b.m/pow(d,2)*(a.z-b.z)/d);
vnewx = a.vx + Fx*dt/a.m;
vnewy = a.vy + Fy*dt/a.m;
vnewz = a.vz + Fz*dt/a.m;
xnew = a.x + a.x*dt;
ynew = a.y + a.y*dt;
znew = a.z + a.z*dt;
F.x = xnew;
F.y = ynew;
F.z = znew;
F.vx = vnewx;
F.vy = vnewy;
F.vz = vnewz;
F.m = a.m;
return F;
}
int main(int argc, char **argv)
{
// begin
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_RGBA | GLUT_DEPTH | GLUT_DOUBLE);
glutInitWindowSize(640,480);
glutCreateWindow("N - body");
glutDisplayFunc(display);
glutReshapeFunc(reshape);
// animation points
//glutTimerFunc(30, animation_points, 1);
////
int n, t;
cout<<"n Number of body: ";
cin>>n;
// move after time t
cout<<"nn Time: ";
cin>>t;
t *= 3600;
// random points
for( int i = 0; i < n; ++i )
{
Point pt;
pt.x = -50 + (rand() % 100);
pt.y = -50 + (rand() % 100);
pt.z = 0;
pt.r = rand() % 255;
pt.g = rand() % 255;
pt.b = rand() % 255;
pt.a = 255;
points.push_back(pt);
}
glutMainLoop();
float d;
//#pragma omp parallel default(shared) private(i,j)
for (int i = 0 ; i < n ; i++)
{
//#pragma omp for schedule(static)
for (int j = 0 ; j < n ; j++)
{
d = Distance(points[i].x, points[i].y,points[i].z, points[j].x, points[j].y, points[j].z);
if (d!=0)
points[i] = CalculateF(d,points[i], points[j], t);
}
pnew.push_back(points[i]);
}
return 0;
}
您需要将点的初始位置和目标位置存储在数组中,然后在呈现代码中在它们之间进行插值。为此,确定经过了多少时间,从时间的0.0到1.0范围内计算double lambda
,然后在位置p_start + lambda * (p_target - p_start)
处绘制点。
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