2022年6月7日 星期二

OuO圖學筆記Week16

alpha内插公式：alpha:

angle

alpha*新. + (1-a1pha)*舊

ex.

alpha: 0=>舊

alpha: 0.5半新半舊

alpha: 1=＞新

使用 Excel or Google Spreadsheet 做練習


1-2.開glut ，用上週TRT_again程式改

#include <GL/glut.h>

#include <stdio.h>


float angle[20], oldX=0;

int angleID=0;

FILE * fout =NULL,*fin=NULL;

void myWrite(){

    if(fout==NULL)

        fout=fopen("file.txt,","w+");


    for(int i=0;i<20;i++){

        printf(" %.1f ",angle[i]);

        fprintf(fout," %.1f ",angle[i]);

    }

    printf("\n");

    fprintf(fout,"\n");

}

float NewAngle[20],OldAngle[20];

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];

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

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

    }

    glutPostRedisplay();

}


void myInterpolate(float alpha)

{

    for(int i=0;i<20;i++){

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

    }

}

int t=0;

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

{

    if(key=='p'){

        if(t%30==0) myRead();

        myInterpolate( (t%30)/30.0 );

        glutPostRedisplay();

        t++;

    }

    if(key=='s') myWrite();

    if(key=='r') myRead();

    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();

    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,-0.5);

    glPushMatrix();

        glTranslatef(0.3,0.4,0);

        glRotatef(angle[0],0,0,1);

        glTranslatef(-0.3,-0.4,0);

        glColor3f(1,0,0);

        glRectf(0.3,0.5, 0.7,0.3);

        glPushMatrix();

            glTranslatef(0.7,0.4,0);

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

            glTranslatef(-0.7,-0.4,0);

            glColor3f(0,1,0);

            glRectf(0.7,0.5, 1.0,0.3);

        glPopMatrix();

    glPopMatrix();

    glPushMatrix();

        glTranslatef(-0.3,0.4,0);

        glRotatef(angle[2],0,0,1);

        glTranslatef(0.3,-0.4,0);

        glColor3f(1,0,0);

        glRectf(-0.3,0.5, -0.7,0.3);

        glPushMatrix();

            glTranslatef(-0.7,0.4,0);

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

            glTranslatef(0.7,-0.4,0);

            glColor3f(0,1,0);

            glRectf(-0.7,0.5, -1.0,0.3);

        glPopMatrix();

    glPopMatrix();

    glutSwapBuffers();

}

int main(int argc,char** argv)

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("week15 angle TRT again");

    glutKeyboardFunc(keyboard);

    glutMouseFunc(mouse);

    glutMotionFunc(motion);

    glutDisplayFunc(display);

    glutMainLoop();

}

長按P會有動畫


1-3.

#include <GL/glut.h>

#include <stdio.h>


float angle[20], oldX=0;

int angleID=0;

FILE * fout =NULL,*fin=NULL;

void myWrite(){

    if(fout==NULL)

        fout=fopen("file.txt,","w+");


    for(int i=0;i<20;i++){

        printf(" %.1f ",angle[i]);

        fprintf(fout," %.1f ",angle[i]);

    }

    printf("\n");

    fprintf(fout,"\n");

}

float NewAngle[20],OldAngle[20];

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];

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

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

    }

    glutPostRedisplay();

}


void myInterpolate(float alpha)

{

    for(int i=0;i<20;i++){

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

    }

}

///int t=0;

void timer(int t)

{

    myInterpolate((t%50)/50.0);

    glutPostRedisplay();

    glutTimerFunc(20,timer,t+1);

}

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

{

    if(key=='p'){

        myRead();

    glutTimerFunc(0,timer,0);

        ///if(t%30==0) myRead();

        ///myInterpolate( (t%30)/30.0 );

        ///glutPostRedisplay();

        ///t++;

    }

    if(key=='s') myWrite();

    if(key=='r') myRead();

    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();

    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,-0.5);

    glPushMatrix();

        glTranslatef(0.3,0.4,0);

        glRotatef(angle[0],0,0,1);

        glTranslatef(-0.3,-0.4,0);

        glColor3f(1,0,0);

        glRectf(0.3,0.5, 0.7,0.3);

        glPushMatrix();

            glTranslatef(0.7,0.4,0);

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

            glTranslatef(-0.7,-0.4,0);

            glColor3f(0,1,0);

            glRectf(0.7,0.5, 1.0,0.3);

        glPopMatrix();

    glPopMatrix();

    glPushMatrix();

        glTranslatef(-0.3,0.4,0);

        glRotatef(angle[2],0,0,1);

        glTranslatef(0.3,-0.4,0);

        glColor3f(1,0,0);

        glRectf(-0.3,0.5, -0.7,0.3);

        glPushMatrix();

            glTranslatef(-0.7,0.4,0);

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

            glTranslatef(0.7,-0.4,0);

            glColor3f(0,1,0);

            glRectf(-0.7,0.5, -1.0,0.3);

        glPopMatrix();

    glPopMatrix();

    glutSwapBuffers();

}

int main(int argc,char** argv)

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("week15 angle TRT again");

    glutKeyboardFunc(keyboard);

    glutMouseFunc(mouse);

    glutMotionFunc(motion);

    glutDisplayFunc(display);

    glutMainLoop();

}


(2)

2-1.開windows/Projection



觀察運鏡效果

2-2.aspect ratio 長寬比 ex.1920 x1080 , 1280 x 720, 16 : 9 , 4 : 3


(3)

3-1.用十行程式改

#include <GL/glut.h>


void reshape(int w/int h)

{

    float ar=(float)w/(float)h;

    glViewport(0,0,w,h);

    glMatrixMode(GL_PROJECTION);///3D變2D

    glLoadIdentity();

    gluPerspective(60,ar,0.1,100);


    glMatrixMode(GL_MODELVIEW);///3D Model+View

    glLoadIdentity();

    gluLookAt(0,0,3,///eye

                       0,0,0,///center看哪裡

                       0,1,0);///up向量

}

void display()

{

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glutSolidTeapot(1);

    glutSwapBuffers();

}

int main(int argc,char**argv)

{

    glutInit(&argc,argv);

    glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);

    glutCreateWindow("Week16 camara");


    glutDisplayFunc(display);

    glutReshapeFunc(reshape);///範例用resize

    glutMainLoop();

}


3-2.

#include <GL/glut.h>


void reshape(int w,int h)

{

    float ar=(float)w/(float)h;

    glViewport(0,0,w,h);

    glMatrixMode(GL_PROJECTION);///3D變2D

    glLoadIdentity();

    gluPerspective(60,ar,0.1,100);


    glMatrixMode(GL_MODELVIEW);///3D Model+View

    glLoadIdentity();

    gluLookAt(0,0,3,///eye

                      0,0,0,///center看哪裡

                      0,1,0);///up向量

}

void display()

{

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glutSolidTeapot(1);

    glutSwapBuffers();

}

void motion (int x,int y)

{

    glMatrixMode(GL_MODELVIEW);///3D Model+View

    glLoadIdentity();

    gluLookAt((x-150)/150.0,(y-150)/150.0,3,///eye

              0,0,0,///center看哪裡

              0,1,0);///up向量

    glutPostRedisplay();///請重畫畫面

}

int main(int argc,char**argv)

{

    glutInit(&argc,argv);

    glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);

    glutCreateWindow("Week16 camara");

    glutMotionFunc(motion);

    glutDisplayFunc(display);

    glutReshapeFunc(reshape);

    glutMainLoop();

}

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