OpenGL 模拟时钟无法正确显示?
OpenGL analog clock doesn't show correctly?
我的时钟有问题。在前 10 分钟内,时针没有显示正确的小时,当分针发生变化时它会发生变化,但在 10 分钟后它会正确显示。你能帮我修复它吗?
我认为这些行有问题,但我不确定:
static void TimeEvent(int te)
{
rx = 30 * cos( angle );
ry = 30 * sin( angle );
rz = 30 * cos( angle );
angle += 0.01;
if (angle > M_TWOPI) angle = 0;
glutPostRedisplay();
glutTimerFunc( 100, TimeEvent, 1);
}
这是我的整个代码:
#include <GL/glut.h>
#include <gl/gl.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <time.h>
GLUquadricObj *Cylinder;
struct tm *newtime;
time_t l_time;
int M_TWOPI=0;
GLfloat rx, ry, rz, angle;
GLfloat LightAmbient[]= { 0.5f, 0.5f, 0.5f, 1.0f };
GLfloat LightDiffuse[]= { 0.5f, 0.5f, 0.5f, 1.0f };
GLfloat LightPosition[]= { 5.0f, 25.0f, 15.0f, 1.0f };
GLfloat mat_specular[] = { 1.0, 1.0, 1.0, 1.0 };
static int view_state = 1; // Ortho view = 1, Perspective = 0
void newLine(float Start, float End, float angle){
float c = cos(angle), s = sin(angle);
glVertex2f( -8.0f*Start*c, -8.0f*Start*s);
glVertex2f( -8.0f*End*c, -8.0f*End*s);
}
void Sprint( float x, float y, char *st)
{
int l,i;
l=strlen( st );
glRasterPos3f( x, y, -1);
for( i=0; i < l; i++)
{
glutBitmapCharacter(GLUT_BITMAP_TIMES_ROMAN_24, st[i]);
}
}
static void TimeEvent(int te)
{
rx = 30 * cos( angle );
ry = 30 * sin( angle );
rz = 30 * cos( angle );
angle += 0.01;
if (angle > M_TWOPI) angle = 0;
glutPostRedisplay();
glutTimerFunc( 100, TimeEvent, 1);
}
void Draw_clock( GLfloat cx, GLfloat cy, GLfloat cz )
{
int hour_ticks , sec_ticks;
glPushMatrix();
glTranslatef(cx,cy,cz);
glRotatef(180, 1.0, 0.0, 0.0);
glPushMatrix();
glColor3f(1.0, 0.5, 0.0);
glTranslatef( 0, 0, 0.0);
glRotatef((360/12) * newtime->tm_hour + (360/60) * (60 / (newtime->tm_min+1)), 0.0, 0.0, 1.0);
glPushMatrix();
glTranslatef(0.0, 0.0, 2.0);
glPopMatrix();
glRotatef(90, 1.0, 0.0, 0.0);
gluCylinder(Cylinder, 0.75, 0, 4, 16, 16);
glPopMatrix();
glPushMatrix();
glColor3f(1.0, 0.0, 1.0);
glTranslatef( 0, 0, 0.0);
glRotatef( (360/60) * newtime->tm_min, 0.0, 0.0, 1.0);
glPushMatrix();
glTranslatef(0.0, 0.0, 3.0);
glScalef(0.5, 0.5, 1.0);
glPopMatrix();
glRotatef( 90, 1.0, 0.0, 0.0);
glutSolidCone (0.5, 6, 6, 16);
glPopMatrix();
glPushMatrix();
glColor3f(1.0, 0.0, 0.0);
glTranslatef( 0, 0, -0.0);
glRotatef( (360/60) * newtime->tm_sec, 0.0, 0.0, 1.0);
glPushMatrix();
glTranslatef(0.0, 0.0, 4.0);
glScalef(0.25, 0.25, 1.0);
glPopMatrix();
glRotatef( 90, 1.0, 0.0, 0.0);
gluCylinder(Cylinder, 0.25, 0, 6, 16, 16);
glPopMatrix();
for(hour_ticks = 0; hour_ticks < 12; hour_ticks++)
{
glPushMatrix();// Draw next arm axis.
glColor3f(0.0, 1.0, 1.0); // give it a color
glTranslatef(0.0, 0.0, 0.0);
glRotatef( (360/12) * hour_ticks, 0.0, 0.0, 1.0);
glTranslatef( 6.0, 0.0, 0.0);
glEnable(GL_LINE_SMOOTH);
glBegin(GL_LINES);
newLine(0.08f, 0.2f, 0.0f);
glEnd();
glPopMatrix();
}
for(sec_ticks = 0; sec_ticks < 60; sec_ticks++)
{
glPushMatrix();
glTranslatef(0.0, 0.0, 0.0);
glRotatef( (360/60) * sec_ticks, 0.0, 0.0, 1.0);
glTranslatef(6.0, 0.0, 0.0);
glutSolidCone(1.0, 2.0, 3, 4);
glPopMatrix();
}
glPopMatrix();
}
void num()
{
glColor3f( 0.0, 0.0, 1.0);
Sprint(-6.2,-0.2,"9"); //counting from center
Sprint(-0.2,-6.2,"6");
Sprint(2.8,-5.5,"5");
Sprint(5.0,-3.2,"4");
Sprint(5.0,+2.8,"2");
Sprint(2.8,+5.0,"1");
Sprint(-3.33,+4.95,"11");
Sprint(-0.2,-6.2,"6");
Sprint(-3.2,-5.45,"7");
Sprint(-0.4,5.7,"12");
Sprint(-5.35,-3.25,"8");
Sprint(-5.55,+2.8,"10");
Sprint(5.8,-0.2,"3");
}
void display_clock()
{
time(&l_time); // Get time
newtime = localtime(&l_time); // Convert to local time
glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
// easy way to put text on the screen.
glMatrixMode (GL_PROJECTION);
glLoadIdentity();
glOrtho(-8.0, 8.0, -8.0, 8.0, 1.0, 60.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glDisable(GL_LIGHTING);
glDisable(GL_COLOR_MATERIAL);
glColor3f( 1.0, 1.0, 1.0);
Sprint(-2, 3, " Clock");
Draw_clock( 0.0, 0.0, -14.0);
num();
glutSwapBuffers();
}
void display(void)
{
glClear(GL_COLOR_BUFFER_BIT);
display_clock();
glFlush();
}
void reshape (int w, int h)
{
glViewport (0, 0, (GLsizei) w, (GLsizei) h);
glMatrixMode (GL_PROJECTION);
glLoadIdentity ();
}
int main(int argc, char** argv)
{
glutInit(&argc, argv);
glutInitDisplayMode (GLUT_DOUBLE | GLUT_RGB);
glutInitWindowSize (500, 500);
glutInitWindowPosition (50, 50);
glutCreateWindow (argv[0]);
glutSetWindowTitle("Clock");
Cylinder = gluNewQuadric();
glutAttachMenu(GLUT_RIGHT_BUTTON);
glutDisplayFunc(display);
glutReshapeFunc(reshape);
glutTimerFunc( 10, TimeEvent, 1);
glutMainLoop();
return 0;
}
你正在做整数算术:
glRotatef((360/12) * newtime->tm_hour + (360/60) * (60 / (newtime->tm_min+1)), 0.0, 0.0, 1.0);
应该是:
glRotatef(30.0 * newtime->tm_hour + 6.0) * (60.0 / (newtime->tm_min+1)), 0.0, 0.0, 1.0);
等等。
但是,由于 360/12 和 360/60 是常量,因此您也可以将它们替换为计算值。
我相信
你的问题就在这里:
glRotatef((360/12) * newtime->tm_hour + (360/60) * (60 / (newtime->tm_min+1)), 0.0, 0.0, 1.0);
它必须是:
glRotatef((360/12) * newtime->tm_hour + (360.0/12 / 60 ) * (newtime->tm_min+1), 0.0, 0.0, 1.0);
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