opengl的模拟人行走的程序

Question

用openGL
实现一个模拟人行走的程序。
要求：
1、用多个立方图形构建人体模型（头，躯干，腿，胳膊等），不同部件采用不同颜色绘制。
2、定义各个局部坐标系，并实现各个部件的几何变换模拟人行走。
3、要求使用键盘控制改变行走方向，参考上机实验几何变换的内容
4、要求使用鼠标控制视角的变换，参考上机实验的视图变换内容
5、要求计算帧率
6、要求地面实现有近大远小的效果，参考上机实验的投影内容，主要是透视投影

Answer 1

#include <GL/glut.h>

// 定义人体模型的参数
float bodyWidth = 0.3f;
float bodyHeight = 0.6f;
float headRadius = 0.1f;
float legLength = 0.4f;
float armLength = 0.3f;

// 人体部件颜色
GLfloat headColor[] = {1.0f, 0.0f, 0.0f};
GLfloat bodyColor[] = {0.0f, 1.0f, 0.0f};
GLfloat legColor[] = {0.0f, 0.0f, 1.0f};
GLfloat armColor[] = {1.0f, 1.0f, 0.0f};

// 视角参数
float camX = 0.0f;
float camY = 2.0f;
float camZ = 4.0f;
float camAngle = 0.0f;

// 行走动画参数
float walkAngle = 0.0f;
float stepLength = 0.05f;

// 计算帧率参数
int frameCount = 0;
int currentTime = 0;
int previousTime = 0;

void drawHead() {
    glColor3fv(headColor);
    glutSolidSphere(headRadius, 20, 20);
}

void drawBody() {
    glColor3fv(bodyColor);
    glScalef(bodyWidth, bodyHeight, bodyWidth);
    glutSolidCube(1.0f);
}

void drawLeg() {
    glColor3fv(legColor);
    glPushMatrix();
    glTranslatef(-bodyWidth / 4, -bodyHeight / 2, 0.0f);
    glScalef(0.5f, legLength, 0.5f);
    glutSolidCube(1.0f);
    glPopMatrix();
}

void drawArm() {
    glColor3fv(armColor);
    glPushMatrix();
    glTranslatef(bodyWidth / 2, bodyHeight / 4, 0.0f);
    glScalef(0.4f, armLength, 0.4f);
    glutSolidCube(1.0f);
    glPopMatrix();
}

void drawPerson() {
    glPushMatrix();
    drawHead();
    drawBody();
    
    glPushMatrix();
    glTranslatef(bodyWidth / 4, -bodyHeight / 2, 0.0f);
    drawLeg();
    glPopMatrix();
    
    glPushMatrix();
    glTranslatef(-bodyWidth / 4, -bodyHeight / 2, 0.0f);
    drawLeg();
    glPopMatrix();
    
    glPushMatrix();
    glTranslatef(bodyWidth / 2, bodyHeight / 4, 0.0f);
    drawArm();
    glPopMatrix();
    
    glPushMatrix();
    glTranslatef(-bodyWidth / 2, bodyHeight / 4, 0.0f);
    drawArm();
    glPopMatrix();
    
    glPopMatrix();
}

void display() {
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
    gluLookAt(camX, camY, camZ, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f);
    
    // 绘制人体模型
    glPushMatrix();
    glRotatef(walkAngle, 0.0f, 1.0f, 0.0f);
    drawPerson();
    glPopMatrix();
    
    glutSwapBuffers();
}

void update(int value) {
    // 计算帧率
    frameCount++;
    int currentTime = glutGet(GLUT_ELAPSED_TIME);
    if (currentTime - previousTime > 1000) {
        float fps = frameCount / ((currentTime - previousTime) / 1000.0f);
        printf("帧率：%.2f\n", fps);
        previousTime = currentTime;
        frameCount = 0;
    }
    
    // 行走动画
    walkAngle += stepLength;
    if (walkAngle > 360.0f) {
        walkAngle -= 360.0f;
    }
    
    glutPostRedisplay();
    glutTimerFunc(1000 / 60, update, 0);
}

void reshape(int w, int h) {
    glViewport(0, 0, (GLsizei) w, (GLsizei) h);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluPerspective(45.0f, (GLfloat) w / (GLfloat) h, 0.1f, 100.0f);
}

void keyboard(unsigned char key, int x, int y) {
    // 使用键盘控制改变行走方向
    switch (key) {
        case 'w':
            camZ -= 0.1f;
            break;
        case 's':
            camZ += 0.1f;
            break;
        case 'a':
            camAngle += 5.0f;
            break;
        case 'd':
            camAngle -= 5.0f;
            break;
    }
    glutPostRedisplay();
}

int main(int argc, char** argv) {
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
    glutInitWindowSize(800, 600);
    glutCreateWindow("OpenGL 人行走模拟");
    glEnable(GL_DEPTH_TEST);
    glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
    glutDisplayFunc(display);
    glutReshapeFunc(reshape);
    glutKeyboardFunc(keyboard);
    glutTimerFunc(0, update, 0);
    glutMainLoop();
    return 0;
}