Week15 課堂作業_01161160劉景晟

#include<stdio.h>

#include<GL/glut.h>

int angleID=0;

float a=0;

float angle[20]={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};

float angleOld[20]={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};

float angleNew[20]={90,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};

void display()

{

glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

glPushMatrix();

glRotatef(angle[0],0,0,1);

glutSolidTeapot(0.3);

glPopMatrix();

glutSwapBuffers();

}

FILE *fout=NULL, *fin=NULL;

void readNext(){

if(fin==NULL)fin=fopen("this_is_my_saved_angles.txt","r");

a+=0.1;

for(int i=0;i<20;i++)angle[i]=angleOld[i]*(1-a) + angleNew[i]*a;

if(a>=1){

a=0;

for(int i=0;i<20;i++){

angleOld[i]=angleNew[i];

fscanf(fin,"%f",&angleNew[i]);

}

}

}

void timer(int t)

{

glutTimerFunc(100,timer,0);

readNext();

glutPostRedisplay();

}

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

{

if(key=='0'){

angleID=0;

}

else if(key=='1'){

angleID=1;

}

else if(key=='2'){

angleID=2;

}

else if(key=='s'){

if(fout==NULL)fout=fopen("this_is_my_saved_angles.txt","w+");

for(int i=0;i<20;i++)fprintf(fout,"%f ",angle[i]);

fprintf(fout,"\n");

}

else if(key=='r'){

readNext();

glutPostRedisplay();

}

else if(key=='p'){

glutTimerFunc(0,timer,0);

}

}

float oldX=0,oldY=0;

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

oldX=x;oldY=y;

}

void motion(int x, int y){

angle[angleID]+=(x-oldX); oldX=x;

glutPostRedisplay();

}

int main()

{

glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

glutCreateWindow("week15");

glutKeyboardFunc(keyboard);

glutDisplayFunc(display);

glutMouseFunc(mouse);

glutMotionFunc(motion);

glutMainLoop();

}

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