运行OpenGL程序时出现白色

pqwbnv8z  于 2022-11-04  发布在  其他
关注(0)|答案(1)|浏览(155)

此程序中没有错误，但在CodeBlockIDE 17.12上显示白色：


# include <stdio.h>

# include <math.h>

# include<GL/gl.h>

# include <GL/glut.h>

# include <windows.h>

# include<GL/glext.h>

# include<GL/glu.h>

# include<stdlib.h>

# define pi 3.142

static GLfloat angle = 0;

static int submenu;
static int mainmenu;
static int value = -1;

void init()
{
    gluOrtho2D(-1000, 1000, -1000, 1000);
}
void circle(float rad)
{
    glBegin(GL_POINTS);
    glColor3f(2, 0, 0);
    for (float i = 0; i < (2 * pi); i += 0.00001)
    {
        glVertex2i(rad * cos(i), rad * sin(i));
    }
    glEnd();
}
void drawString(float x, float y, float z, char *string)
{
    glColor3f(1, 1, 1);
    glRasterPos3f(x, y, z);

    for (char *c = string; *c != '\0'; c++)
    {
        glutBitmapCharacter(GLUT_BITMAP_HELVETICA_10, *c);
    }
}

void drawhead(float x, float y, float z, char *string)
{
    glColor3f(1, 1, 1);
    glRasterPos3f(x, y, z);

    for (char *c = string; *c != '\0'; c++)
    {
        glutBitmapCharacter(GLUT_BITMAP_HELVETICA_18, *c);
    }
}
void drawsubhead(float x, float y, float z, char *string)
{
    glColor3f(1, 1, 1);
    glRasterPos3f(x, y, z);

    for (char *c = string; *c != '\0'; c++)
    {
        glutBitmapCharacter(GLUT_BITMAP_HELVETICA_12, *c);
    }
}
void nuc(float rad)
{
    glBegin(GL_POLYGON);
    glColor3f(0, 0, 1);
    for (float i = 0; i < (2 * pi); i = i + 0.00001)
    {
        glVertex2f(rad * cos(i), rad * sin(i));
    }
    glEnd();
}
void eleright(float rad)
{
    glBegin(GL_POLYGON);
    glColor3f(1, 1, 1);
    for (float i = 0; i < (2 * pi); i += 0.00001)
    {
        glVertex2i(rad + 20 * cos(i), 20 * sin(i));
    }
    glEnd();
}
void eleleft(float rad)
{
    glBegin(GL_POLYGON);
    glColor3f(1, 1, 1);
    for (float i = 0; i < (2 * pi); i += 0.00001)
    {
        glVertex2i(-(rad + 20 * cos(i)), 20 * sin(i));
    }
    glEnd();
}
void eletop(float rad)
{
    glBegin(GL_POLYGON);
    glColor3f(1, 1, 1);
    for (float i = 0; i < (2 * pi); i += 0.00001)
    {
        glVertex2i(20 * cos(i), rad + 20 * sin(i));
    }
    glEnd();
}
void eledown(float rad)
{
    glBegin(GL_POLYGON);
    glColor3f(1, 1, 1);
    for (float i = 0; i < (2 * pi); i += 0.00001)
    {
        glVertex2i(20 * cos(i), -(rad + 20 * sin(i)));
    }
    glEnd();
}
void eletr(float rad)
{
    glBegin(GL_POLYGON);
    glColor3f(1, 1, 1);
    for (float i = 0; i < (2 * pi); i += 0.00001)
    {
        glVertex2i(((rad - 175) + 20 * cos(i)), ((rad - 175) + 20 * sin(i)));
    }
    glEnd();
}
void eletl(float rad)
{
    glBegin(GL_POLYGON);
    glColor3f(1, 1, 1);
    for (float i = 0; i < (2 * pi); i += 0.00001)
    {
        glVertex2i(-((rad - 175) + 20 * cos(i)), ((rad - 175) + 20 * sin(i)));
    }
    glEnd();
}
void eledl(float rad)
{
    glBegin(GL_POLYGON);
    glColor3f(1, 1, 1);
    for (float i = 0; i < (2 * pi); i += 0.00001)
    {
        glVertex2i(-((rad - 175) + 20 * cos(i)), -((rad - 175) + 20 * sin(i)));
    }
    glEnd();
}
void eledr(float rad)
{
    glBegin(GL_POLYGON);
    glColor3f(1, 1, 1);
    for (float i = 0; i < (2 * pi); i += 0.00001)
    {
        glVertex2i(((rad - 175) + 20 * cos(i)), -((rad - 175) + 20 * sin(i)));
    }
    glEnd();
}
void display()
{
    glClearColor(0, 0, 0.1, 0.9);

    if (value == -1)
    {
        char cn[] = "GOVERNMENT ENGINEERING COLLEGE RAMANAGAR";
        drawhead(-620, 900, 0, cn);
        char pn[] = "B.M.ROAD,RAMANAGARA-562159";
        drawsubhead(-300, 850, 0, pn);

        char dn[] = "DEPARTMENT OF COMPUTER SCIENCE & ENGINEERING";
        drawhead(-650, 650, 0, dn);

        char prn[] = "A Mini Project On";
        drawsubhead(-150, 450, 0, prn);
        char pro[] = "ATOM SIMULATION";
        drawhead(-250, 350, 0, pro);

        char pb[] = "PROJECT BY: ";
        drawhead(-690, -150, 0, pb);

        char p1[] = "ADARSH.N";
        drawhead(-690, -250, 0, p1);
        char p1u[] = "1GG18CS002";
        drawsubhead(-690, -300, 0, p1u);

        char p2[] = "NITHIN KUMAR B";
        drawhead(-690, -400, 0, p2);
        char p2u[] = "1GG18CS028";
        drawsubhead(-690, -450, 0, p2u);

        char gb[] = "GUIDED BY: ";
        drawhead(290, -150, 0, gb);

        char g1[] = "Dr.SRI RAMACHANDRA L";
        drawhead(290, -250, 0, g1);
        char d1[] = "Professor, Dept. Of CSE, GECR";
        drawsubhead(290, -300, 0, d1);

        //char g2[] = "Sunil G L";
        //drawhead(290, -400, 0, g2);
        //char d2[] = "Assistant Professor, Dept. of CSE, SVIT";
        //drawsubhead(290, -450, 0, d2);

        char in[] = "Press enter to Continue";
        drawhead(-250, -700, 0, in);

        glutSwapBuffers();
        glutDetachMenu(GLUT_RIGHT_BUTTON);
    }
    if (value != -1)
    {
        nuc(250);
        char n[] = "NUCLEUS";
        drawString(-80, 20, 0, n);
        char d[] = "(NEUTRON + PROTON)";
        drawString(-155, -30, 0, d);
        if (value == 0)
        {
            char nu[] = "SELECT THE ELEMENT USING MENU";
            drawhead(-490, 900, 0, nu);
        }
    }
    if (value == 1)
    {
        char n[] = "HYDROGEN";
        drawhead(-100, 900, 0, n);
        circle(400);
        char o[] = "ORBIT";
        drawString(410, 0, 0, o);
        glPushMatrix();
        glRotatef(angle, 0, 0, 1);
        eleright(400);
        char e[] = "ELECTRON";
        drawString(420, 0, 0, e);
        glPopMatrix();
        glutSwapBuffers();
    }
    if (value == 2)
    {
        char n[] = "HELIUM";
        drawhead(-100, 900, 0, n);
        circle(400);
        char o[] = "ORBIT";
        drawString(410, 0, 0, o);
        glPushMatrix();
        glRotatef(angle, 0, 0, 1);
        eleright(400);
        eleleft(400);
        char e[] = "ELECTRON";
        drawString(420, 0, 0, e);
        glPopMatrix();
        glutSwapBuffers();
    }
    if (value == 3)
    {
        char n[] = "LITHIUM";
        drawhead(-100, 900, 0, n);
        circle(400);
        circle(600);
        char o[] = "ORBIT";
        drawString(610, 0, 0, o);
        glPushMatrix();
        glRotatef(angle, 0, 0, 1);
        eleright(400);
        eleleft(400);
        eletop(600);
        char e[] = "ELECTRON";
        drawString(0, 620, 0, e);
        glPopMatrix();
        glutSwapBuffers();
    }
    if (value == 4)
    {
        char n[] = "BERYLLIUM";
        drawhead(-100, 900, 0, n);
        circle(400);
        circle(600);
        char o[] = "ORBIT";
        drawString(610, 0, 0, o);
        glPushMatrix();
        glRotatef(angle, 0, 0, 1);
        eleright(400);
        eleleft(400);
        eletop(600);
        eledown(600);
        char e[] = "ELECTRON";
        drawString(0, 620, 0, e);
        glPopMatrix();
        glutSwapBuffers();
    }
    if (value == 5)
    {
        char n[] = "BORON";
        drawhead(-100, 900, 0, n);
        circle(400);
        circle(600);
        char o[] = "ORBIT";
        drawString(610, 0, 0, o);
        glPushMatrix();
        glRotatef(angle, 0, 0, 1);
        eleright(400);
        eleleft(400);
        eletop(600);
        eledown(600);
        eletr(600);
        char e[] = "ELECTRON";
        drawString(0, 620, 0, e);
        glPopMatrix();
        glutSwapBuffers();
    }
    if (value == 6)
    {
        char n[] = "CARBON";
        drawhead(-100, 900, 0, n);
        circle(400);
        circle(600);
        char o[] = "ORBIT";
        drawString(610, 0, 0, o);
        glPushMatrix();
        glRotatef(angle, 0, 0, 1);
        eleright(400);
        eleleft(400);
        eletop(600);
        eledown(600);
        eletr(600);
        eledl(600);
        char e[] = "ELECTRON";
        drawString(0, 620, 0, e);
        glPopMatrix();
        glutSwapBuffers();
    }
    if (value == 7)
    {
        char n[] = "NITROGEN";
        drawhead(-100, 900, 0, n);
        circle(400);
        circle(600);
        char o[] = "ORBIT";
        drawString(610, 0, 0, o);
        glPushMatrix();
        glRotatef(angle, 0, 0, 1);
        eleright(400);
        eleleft(400);
        eletop(600);
        eledown(600);
        eletr(600);
        eledl(600);
        eletl(600);
        char e[] = "ELECTRON";
        drawString(0, 620, 0, e);
        glPopMatrix();
        glutSwapBuffers();
    }
    if (value == 8)
    {
        char n[] = "OXYGEN";
        drawhead(-100, 900, 0, n);
        circle(400);
        circle(600);
        char o[] = "ORBIT";
        drawString(610, 0, 0, o);
        glPushMatrix();
        glRotatef(angle, 0, 0, 1);
        eleright(400);
        eleleft(400);
        eletop(600);
        eledown(600);
        eletr(600);
        eledl(600);
        eletl(600);
        eledr(600);
        char e[] = "ELECTRON";
        drawString(0, 620, 0, e);
        glPopMatrix();
        glutSwapBuffers();
    }
    if (value == 9)
    {
        char n[] = "FLUORINE";
        drawhead(-100, 900, 0, n);
        circle(400);
        circle(600);
        char o[] = "ORBIT";
        drawString(610, 0, 0, o);
        glPushMatrix();
        glRotatef(angle, 0, 0, 1);
        eleright(400);
        eleleft(400);
        eletop(600);
        eledown(600);
        eletr(600);
        eledl(600);
        eletl(600);
        eledr(600);
        eleleft(600);
        char e[] = "ELECTRON";
        drawString(0, 620, 0, e);
        glPopMatrix();
        glutSwapBuffers();
    }
    if (value == 10)
    {
        char n[] = "NEON";
        drawhead(-100, 900, 0, n);
        circle(400);
        circle(600);
        char o[] = "ORBIT";
        drawString(610, 0, 0, o);
        glPushMatrix();
        glRotatef(angle, 0, 0, 1);
        eleright(400);
        eleleft(400);
        eletop(600);
        eledown(600);
        eletr(600);
        eledl(600);
        eletl(600);
        eledr(600);
        eleleft(600);
        eleright(600);
        char e[] = "ELECTRON";
        drawString(0, 620, 0, e);
        glPopMatrix();
        glutSwapBuffers();
    }

    glutSwapBuffers();
}
void rotate()
{
    angle = angle + 1.0;
    if (angle > 360)
    {
        angle = angle - 360;
    }
    glClear(GL_COLOR_BUFFER_BIT);
    glutPostRedisplay();
}
void mouseControl(int button, int state, int x, int y)
{
    switch (button)
    {
    case GLUT_LEFT_BUTTON:
        if (state == GLUT_DOWN)
            glutIdleFunc(rotate);
        break;
    default:
        break;
    }
}
void keyboard(unsigned char key, int x, int y)
{
    if (key == 13)
    {
        value = 0;
        glClear(GL_COLOR_BUFFER_BIT);
        glutAttachMenu(GLUT_RIGHT_BUTTON);
        glutPostRedisplay();
    }
    else if (key == 's')
    {
        glutIdleFunc(NULL);
    }
    else if (key == 32)
    {
        glutIdleFunc(rotate);
    }
    else if (key == 'q' || key == 'Q')
    {
        exit(0);
    }
    else if (key == 27)
    {
        glutReshapeWindow(700, 700);
    }
}
void fkey(int key, int x, int y)
{

    if (key == GLUT_KEY_F10)
    {
        glutReshapeWindow(glutGet(GLUT_SCREEN_WIDTH), glutGet(GLUT_SCREEN_HEIGHT));
    }
}
void menu(int option)
{
    if (option == 13)
    {
        exit(0);
    }
    else if (option == 11)
    {
        glutIdleFunc(rotate);
    }
    else if (option == 12)
    {
        glutIdleFunc(NULL);
    }
    else if(option==14){
        value=-1;
    }
    else
    {
        value = option;
    }
    glClear(GL_COLOR_BUFFER_BIT);

    glutPostRedisplay();
}
void createMenu(void)
{
    submenu = glutCreateMenu(menu);
    glutAddMenuEntry("HYDROGEN", 1);
    glutAddMenuEntry("HELIUM", 2);
    glutAddMenuEntry("LITHIUM", 3);
    glutAddMenuEntry("BERILIUM", 4);
    glutAddMenuEntry("BORON", 5);
    glutAddMenuEntry("CARBON", 6);
    glutAddMenuEntry("NITROGEN", 7);
    glutAddMenuEntry("OXYGEN", 8);
    glutAddMenuEntry("FLUORINE", 9);
    glutAddMenuEntry("NEON", 10);
    mainmenu = glutCreateMenu(menu);
    glutAddSubMenu("SELECT THE ELEMENT", submenu);
    glutAddMenuEntry("START SIMULATION", 11);
    glutAddMenuEntry("STOP SIMULATION", 12);
    glutAddMenuEntry("GOTO HOME SCREEN",14);
    glutAddMenuEntry("EXIT", 13);

    glutAttachMenu(GLUT_RIGHT_BUTTON);
}
int main(int argc, char**argv)
{
    glutInit(&argc, argv);
    glutInitWindowPosition(100, 100);
    glutInitWindowSize(700, 700);
    glutCreateWindow("ATOM SIMULATION");
    init();
    glutDisplayFunc(display);
    glutMouseFunc(mouseControl);
    glutKeyboardFunc(keyboard);
    glutSpecialFunc(fkey);
    createMenu();
    glutMainLoop();
    return 0;
}

如何显示输出？应该更正什么？

opengl

1条答案

按热度按时间
7rtdyuoh

7rtdyuoh1#

你从来没有真正清除帧缓冲区。你只设置了清晰的颜色，但这就像把刷子浸入一桶油漆，而不是去粉刷墙壁。
按如下方式更改显示功能：

void display()
{
    glClearColor(0, 0, 0.1, 0.9);
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    ...
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