我正在使用rand（）函数将多维数据集放置在屏幕上的不同位置。原因是我必须在屏幕上随机放置多个多维数据集，并且我不希望它们都从同一位置开始。发生的是，当我运行该程序时，由于glutPostRedisplay（）需要旋转多维数据集，因此多维数据集在整个屏幕上跳跃。我的问题是，例如，当所有旋转时，如何从屏幕上的7个不同位置开始有7个立方体？我最终需要它们从其起点沿z轴离开屏幕，然后重新开始整个过程吗？
这是我的代码：
/* -- GLOBAL VARIABLES -------------------------------------------------------------------------- --------------- */
GLint screenWidth = 500;
GLint screenHeight = 500;
GLfloat cubeX = 0.0;
GLfloat cubeY = 5.0;
GLfloat cubeZ = -20.0;
GLfloat rotateY = 0.0;
//GLfloat rotCube = 0.0;
GLint cubeCount = 0;
//const GLint CUBE_LOW = 7;
//const GLint CUBE_HIGH = 15;
const GLint CUBE_HIGH = 15;
const GLint CUBE_LOW = 7;
const GLfloat X_HIGH = 10.0;
const GLfloat X_LOW = -10.0;
const GLfloat Y_HIGH = 10.0;
const GLfloat Y_LOW = -10.0;
/* -- NAMESPACE --------------------------------------------------------------------------------- --------------- */
using namespace std;
/* ---------------------------------------------------------------------------------------------- -------------- */
/*
Function: unsigned time_seed()
*/
unsigned time_seed()
{
time_t now = time (0);
unsigned char *p = (unsigned char *)&now;
unsigned seed = 0;
size_t i;
for(i = 0; i < sizeof now; i++)
seed = seed * (UCHAR_MAX + 2U) + p[i];
return seed;
}
/* ---------------------------------------------------------------------------------------------- --------------- */
/*
Function: void rotateCube()
*/
void rotateCube()
{
rotateY += 0.050f;
if(rotateY > 360.0f)
rotateY -= 360.0f;
glutPostRedisplay();
}
/* ---------------------------------------------------------------------------------------------- --------------- */
/*
Function: void myDisplay()
*/
void myDisplay()
{
cubeCount = CUBE_LOW + rand() / RAND_MAX * (CUBE_HIGH - CUBE_LOW);
float cubeX = X_LOW + (float)rand() / (float)RAND_MAX * (X_HIGH - X_LOW);
float cubeY = Y_LOW + (float)rand() / (float)RAND_MAX * (Y_HIGH - Y_LOW);
for(int i = 0; i < cubeCount; i++)
{
glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
glClear(GL_COLOR_BUFFER_BIT);
glLoadIdentity();
glTranslatef(cubeX, cubeY, cubeZ);
glRotatef(rotateY, 0.0f, 1.0f, 0.0f);
glutWireCube(2.0f);
glutSwapBuffers();
glFlush();
}
}
/* ---------------------------------------------------------------------------------------------- --------------- */
/*
Function: int main( int argc, char **argv )
*/
void myReshape(int width, int height)
{
glViewport(0, 0, (GLsizei)width, (GLsizei)height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(60, (GLfloat)width / (GLfloat)height, 1.0, 100);
glMatrixMode(GL_MODELVIEW);
}
/* ---------------------------------------------------------------------------------------------- --------------- */
/*
Function: int main( int argc, char **argv )
*/
int main( int argc, char **argv )
{
srand(time_seed());
glutInit( &argc, argv );
glutInitDisplayMode(GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE);
glutInitWindowSize(screenWidth, screenHeight);
glutInitWindowPosition(100, 40);
glutCreateWindow("Boxes!");
glutDisplayFunc(myDisplay);
glutIdleFunc(rotateCube);
glutReshapeFunc(myReshape);
glutMainLoop();
return 0;
}
最佳答案
除了qternion所说的以外，您不妨尝试以下代码。
我添加了一个用户定义的类型-vec3。我对多维数据集的数量进行了硬编码，我添加了一个调用以在程序启动时定位所有多维数据集。
#include <GL/glut.h>
#include <stdlib.h>
#include <time.h>
/* -- GLOBAL VARIABLES -------------------------------------------------------------------------- --------------- */
GLint screenWidth = 500;
GLint screenHeight = 500;
GLfloat cubeX = 0.0;
GLfloat cubeY = 5.0;
GLfloat cubeZ = -20.0;
GLfloat rotateY = 0.0;
//GLfloat rotCube = 0.0;
GLint cubeCount = 0;
//const GLint CUBE_LOW = 7;
//const GLint CUBE_HIGH = 15;
const GLint CUBE_HIGH = 15;
const GLint CUBE_LOW = 7;
const GLfloat X_HIGH = 10.0;
const GLfloat X_LOW = -10.0;
const GLfloat Y_HIGH = 10.0;
const GLfloat Y_LOW = -10.0;
const int maxCubes = 50;
typedef struct vec3
{
double x, y, z;
};
vec3 cubeOrigins[maxCubes];
/* -- NAMESPACE --------------------------------------------------------------------------------- --------------- */
using namespace std;
void initOrigins()
{
int i;
for (i=0; i<maxCubes; i++)
{
cubeOrigins[i].x = X_LOW + (float)rand() / (float)RAND_MAX * (X_HIGH - X_LOW);
cubeOrigins[i].y = Y_LOW + (float)rand() / (float)RAND_MAX * (Y_HIGH - Y_LOW);
}
}
/* ---------------------------------------------------------------------------------------------- -------------- */
/*
Function: unsigned time_seed()
*/
unsigned time_seed()
{
time_t now = time (0);
unsigned char *p = (unsigned char *)&now;
unsigned seed = 0;
size_t i;
for(i = 0; i < sizeof now; i++)
seed = seed * (255 + 2U) + p[i];
return seed;
}
/* ---------------------------------------------------------------------------------------------- --------------- */
/*
Function: void rotateCube()
*/
void rotateCube()
{
rotateY += 0.050f;
if(rotateY > 360.0f)
rotateY -= 360.0f;
glutPostRedisplay();
}
/* ---------------------------------------------------------------------------------------------- --------------- */
/*
Function: void myDisplay()
*/
void myDisplay()
{
glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
glClear(GL_COLOR_BUFFER_BIT);
for(int i = 0; i < maxCubes; i++)
{
glLoadIdentity();
glTranslatef(cubeOrigins[i].x, cubeOrigins[i].y, cubeZ);
glRotatef(rotateY, 0.0f, 1.0f, 0.0f);
glutWireCube(2.0f);
}
glutSwapBuffers();
glFlush();
}
/* ---------------------------------------------------------------------------------------------- --------------- */
/*
Function: int main( int argc, char **argv )
*/
void myReshape(int width, int height)
{
glViewport(0, 0, (GLsizei)width, (GLsizei)height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(60, (GLfloat)width / (GLfloat)height, 1.0, 100);
glMatrixMode(GL_MODELVIEW);
}
/* ---------------------------------------------------------------------------------------------- --------------- */
/*
Function: int main( int argc, char **argv )
*/
int main( int argc, char **argv )
{
srand(time_seed());
initOrigins();
glutInit( &argc, argv );
glutInitDisplayMode(GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE);
glutInitWindowSize(screenWidth, screenHeight);
glutInitWindowPosition(100, 40);
glutCreateWindow("Boxes!");
glutDisplayFunc(myDisplay);
glutIdleFunc(rotateCube);
glutReshapeFunc(myReshape);
glutMainLoop();
return 0;
}
关于c++ - 当我使用glutIdleFunc尝试将多维数据集放置在不同的x轴上时3d立方体在x轴上跳跃，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/19329506/