我的week16

1.熟悉alpha內插

內插公式：alpha*新的（1-alpha）*舊的

2.打開上週的angel_TRT_again增加內插程式碼

#include <GL/glut.h>

#include <stdio.h>

float angle[20],oldX=0;

float NewAngle[20], OldAngle[20];

int angleID=0;

FILE * fout = NULL, * fin = NULL;

void myWrite(){

    if(fin!=NULL){

        fclose(fin);

        fin=NULL;

    }

    if(fout==NULL) fout = fopen("file.txt","W+");

    for(int i=0;i<20;i++){

        printf(        "%.2f ",angle[i] );

        fprintf(fout, "%.2f ", angle[i] );

    }

    printf("\n");

    fprintf(fout,"\n");

}

void myRead(){

    if(fout!=NULL) {fclose(fout); fout=NULL;}

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

    for(int i=0;i<20;i++){

        OldAngle[i] = NewAngle[i];

    }

    glutPostRedisplay();

}

void timer(int t)

{

    glutTimerFunc();

}

void myInterpolate(float alpha){

    for(int i=0,i<20;i++){

        angle[i] = alpha * NewAngle[i] + (1-alpha) * OldAngle[i];

        printf("%.2f ", angle[i] );

    }

    printf("\n");

    glutPostRedisplay();

    alpha = (alpha+0.1);

    if(alpha>1) alpha = alpha-1;

}

float alpha=0;

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

{

    if( key=='p') myInterpolate(alpha);

    if( key=='r') myRead();

    if( key=='s') myWrite();///save

    if( key=='0') angleID=0;

    if( key=='1') angleID=1;

    if( key=='2') angleID=2;

    if( key=='3') angleID=3;

}

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

    oldX=x;

}

void motion(int x,int y){

    angle[angleID] += (x-oldX);

    ///myWrite();///›]ÓбØÒªÒ»Ö±Œ‘™n

    oldX = x;

    glutPostRedisplay();

}

void display()

{

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glColor3f(1,1,1);

    glRectf(0.3,0.5,-0.3,-0.2);

    glPushMatrix();

        glTranslatef(0.3,0.5,0);

        glRotatef(angle[0],0,0,1);

        glTranslatef(-0.3,-0.4,0);

        glColor3f(1,0,0);

        glRectf(0.3,0.5,0.8,0.3);

        glPushMatrix();

            glTranslatef(0.8,0.4,0);

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

            glTranslatef(-0.8,-0.4,0);

            glColor3f(0,1,0);

            glRectf(0.8,0.5,1.1,0.3);

        glPopMatrix();

    glPopMatrix();

    glPushMatrix();

        glTranslatef(-0.3,0.5,0);

        glRotatef(angle[2],0,0,1);

        glTranslatef(0.3,-0.4,0);

        glColor3f(1,0,0);

        glRectf(-0.3,0.5,-0.8,0.3);

        glPushMatrix();

            glTranslatef(-0.8,0.4,0);

            glRotatef(angle[3],0,0,1);

            glTranslatef(0.8,-0.4,0);

            glColor3f(0,1,0);

            glRectf(-0.8,0.5,-1.1,0.3);

        glPopMatrix();

    glPopMatrix();

    glutSwapBuffers();

}

int main(int argc, char**argv)

{

    glutInit(&argc,argv);

    glutInitDisplayMode(GLUT_DOUBLE| GLUT_DEPTH);

    glutCreateWindow("week15 TRT angle again");

    glutKeyboardFunc(keyboard);

    glutMouseFunc(mouse);

    glutMotionFunc(motion);

    glutDisplayFunc(display);

    glutMainLoop();

}

3.利用timer做内插

4.去下載windows打開projection實驗

eye是從哪裡看

center是中心點

up是攝影機自我旋轉

5.畫茶壺試用攝影機放大縮小的功能