week15課堂作業

內插法的使用

#include <GL/glut.h>
float a=0; //a is the alpha weight內差的比重
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=='r')
{
a+=0.1;
angle =angleOld*(1-a)+angleNew*a;//內差法
}
glutPostRedisplay();
}

int main()
{
glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);
glutCreateWindow("week15");

glutKeyboardFunc(keyboard);
glutDisplayFunc(display);
glutMainLoop();
}

=========加入timer來控制茶壺轉動=========
#include <GL/glut.h>
float a=0; //a is the alpha weight內差的比重
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=='r')
{
readNext();
}
else if(key=='p')
{
glutTimerFunc(0,timer,0);//0的話就是立即開始播放,若為2000的話就是2秒後開始播放
}
glutPostRedisplay();
}

int main()
{
glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);
glutCreateWindow("week15");

glutKeyboardFunc(keyboard);
glutDisplayFunc(display);
glutMainLoop();
}