week15

1.內插法

程式碼：
#include<GL/glut.h>
float a=0;
float angle=0;
float angleOld=0;
float angleNew=90;
void display()
{
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glPushMatrix();
glRotatef(angle,0,0,1);
glutSolidTeapot(0.3);
glPopMatrix();
glutSwapBuffers();
}
void keyboard(unsigned char key,int x,int y)
{
if(key=='z')
{
a+=0.1;
angle=angleOld*(1-a)+angleNew*a;
}
glutPostRedisplay();
}
int main()
{
glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);
glutCreateWindow("week15");
glutKeyboardFunc(keyboard);
glutDisplayFunc(display);
glutMainLoop();
}
   

2.改用矩陣方式儲存

修改程式部分；

#include<GL/glut.h>

float a=0;

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

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

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();

glPushMatrix();

glTranslatef(0.5,0,0);

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

glutSolidTeapot(0.3);

glPopMatrix();

glutSwapBuffers();

}

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

{

if(key=='z')

{

a+=0.1;

angle[0]=angleOld[0]*(1-a)+angleNew[0]*a;

angle[1]=angleOld[1]*(1-a)+angleNew[1]*a;

angle[2]=angleOld[2]*(1-a)+angleNew[2]*a;

angle[3]=angleOld[3]*(1-a)+angleNew[3]*a;

angle[4]=angleOld[4]*(1-a)+angleNew[4]*a;

angle[5]=angleOld[5]*(1-a)+angleNew[5]*a;

angle[6]=angleOld[6]*(1-a)+angleNew[6]*a;

angle[7]=angleOld[7]*(1-a)+angleNew[7]*a;

angle[8]=angleOld[8]*(1-a)+angleNew[8]*a;

}

glutPostRedisplay();

}

int main()

{

glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);

glutCreateWindow("week15");

glutKeyboardFunc(keyboard);

glutDisplayFunc(display);

glutMainLoop();

}

     

3.自動轉動

程式碼：

#include<GL/glut.h>

float a=0;

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

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

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();

glTranslatef(angle[3],angle[4],angle[5]);

glPushMatrix();

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

glutSolidTeapot(0.3);

glPopMatrix();

glPushMatrix();

glTranslatef(0.5,0,0);

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

glutSolidTeapot(0.3);

glPopMatrix();

glPopMatrix();

glutSwapBuffers();

}

void readNext()

{

a+=0.1;

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

{

angle[i]=angleOld[i]*(1-a)+angleNew[i]*a;

}

}

void timer(int t)

{

glutTimerFunc(10,timer,0);

readNext();

glutPostRedisplay();

}

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

{

if(key=='z')//手動轉動

{

readNext();

}

else if(key=='p') //自動轉動

{

glutTimerFunc(0,timer,0);

}

glutPostRedisplay();

}

int main()

{

glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);

glutCreateWindow("week15");

glutKeyboardFunc(keyboard);

glutDisplayFunc(display);

glutMainLoop();

}

     

4.加入滑鼠控制、存檔、讀檔

程式碼：

#include<stdio.h>

#include<GL/glut.h>

float a=0;

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

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

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

FILE *fout=NULL, *fin=NULL;

int angleID=0;

void display()

{

glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

glPushMatrix();

glTranslatef(angle[3],angle[4],angle[5]);

glPushMatrix();

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

glutSolidTeapot(0.3);

glPopMatrix();

glPushMatrix();

glTranslatef(0.5,0,0);

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

glutSolidTeapot(0.3);

glPopMatrix();

glPopMatrix();

glutSwapBuffers();

}

void readNext()

{

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

a+=0.05;

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

{

angle[i]=angleOld[i]*(1-a)+angleNew[i]*a;

}

if(a>=1.0)

{

a=0.0;

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

{

angleOld[i]=angleNew[i];

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

}

glutPostRedisplay();

}

}

int 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();

}

void timer(int t)

{

glutTimerFunc(10,timer,0);

readNext();

glutPostRedisplay();

}

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

{

if(key=='0') angleID=0;

if(key=='1') angleID=1;

if(key=='2') angleID=2;

if(key=='s')

{

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

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

{

printf("%f",angle[i]);

fprintf(fout,"%f ",angle[i]);

}

printf("\n");

fprintf(fout,"\n");

}

if(key=='z')

{

readNext();

}

else if(key=='p')

{

glutTimerFunc(0,timer,0);

}

glutPostRedisplay();

}

int main()

{

glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);

glutCreateWindow("week15");

glutKeyboardFunc(keyboard);

glutDisplayFunc(display);

glutMouseFunc(mouse);

glutMotionFunc(motion);

glutMainLoop();

}