week14 余

 Week14-1

 先用GIT指令下載下來2023graphicsb，開啟新的GLUT專案，放在桌面2023graphicsb裡

然後輸入下列程式碼:

#include <GL/glut.h>

float angle=0;

void timer(int t)

{

    glutTimerFunc(500,timer,t+1);

    angle+=90;

    glutPostRedisplay();

}

void display()

{

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

        glRotatef(angle,0,0,1);

        glutSolidTeapot(0.3);

    glPopMatrix();

    glutSwapBuffers();

}

int main(int argc, char**argv)

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("Week14");

    glutTimerFunc(3000,timer,0);

    glutDisplayFunc(display);

    glutMainLoop();

}

茶壺就會半秒轉90度一次~

 Week14-2

第二個程式是從上個程式做修改

修改後的程式碼如下:

#include <GL/glut.h>

float angle=0;

void timer(int t)

{

    glutTimerFunc(33,timer,t+1);

    angle += 3;

    glutPostRedisplay();

}

void keyboard(unsigned char key,int x,int y)

{

    glutTimerFunc(0,timer,0);

}

void display()

{

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

        glRotatef(angle,0,0,1);

        glutSolidTeapot(0.3);

    glPopMatrix();

    glutSwapBuffers();

}

int main(int argc, char**argv)

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("Week14");

    glutKeyboardFunc(keyboard);

    ///glutTimerFunc(3000,timer,0);

    glutDisplayFunc(display);

    glutMainLoop();

}

按數字鍵就可以越轉越快~

 Week14-3

再從第二個程式做修改

修改後的程式碼如下:

#include <GL/glut.h>

float angle=0,newAngle = 0,oldAngle = 0;

float oldX = 0;

void timer(int t)

{

    if(t<100) glutTimerFunc(33,timer,t+1);

    float alpha = t/100.0;

    angle = alpha*newAngle + (1-alpha)*oldAngle;

    glutPostRedisplay();

}

void keyboard(unsigned char key,int x,int y)

{

    glutTimerFunc(0,timer,0);

}

void mouse(int button,int state,int x,int y)

{

    if(state==GLUT_DOWN) oldAngle = angle;

    if(state==GLUT_UP) newAngle = angle;

    oldX = x;

    glutPostRedisplay();

}

void motion(int x,int y)

{

    angle += x-oldX;

    oldX = x;

    glutPostRedisplay();

}

void display()

{

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

        glRotatef(angle,0,0,1);

        glutSolidTeapot(0.3);

    glPopMatrix();

    glutSwapBuffers();

}

int main(int argc, char**argv)

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("Week14");

    glutMouseFunc(mouse);

    glutMotionFunc(motion);

    glutKeyboardFunc(keyboard);

    ///glutTimerFunc(3000,timer,0);

    glutDisplayFunc(display);

    glutMainLoop();

}

就可以自己旋轉他，然後按空白鍵就會撥放