2022年6月7日 星期二

電腦圖學筆記

 alpha內插公式 : angle = alpha *新的 + (1-alpha) *舊的

alpha = 0.0 ~ 1

===========================================================================

偷上禮拜的程式碼

///week16_interpolation

///改編自week15_angles_TRT_again

#include <GL/glut.h>

#include <stdio.h>

float angle[20],oldX=0;

int angleID=0;

FILE * fout=NULL, * fin = NULL;

void myWrite()

{///每呼叫一次myWrite

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


    for(int i = 0;i<20;i++)

    {

        printf("%.1f ",angle[i]);///小黑印出來

        fprintf(fout,"%.1f ",angle[i]);///檔案印出來

    }///這裡老師沒有fclose

    printf("\n");///小黑印出跳行

    fprintf(fout,"\n");///檔案跳行

}

void myRead()

{

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

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

    for(int i=0;i<20;i++)

    {

        fscanf(fin,"%f",&angle[i]);

    }

    glutPostRedisplay();///重劃畫面

}

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

{

    if(key=='s') myWrite();///調好動作才save存檔

    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_angles_TRT_again");

    glutMouseFunc(mouse);

    glutMotionFunc(motion);

    glutKeyboardFunc(keyboard);

    glutDisplayFunc(display);


    glutMainLoop();

 }


=========================================================================

///week16_interpolation

///改編自week15_angles_TRT_again

#include <GL/glut.h>

#include <stdio.h>

float angle[20],oldX=0;

int angleID=0;

FILE * fout=NULL, * fin = NULL;

void myWrite()

{///每呼叫一次myWrite

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


    for(int i = 0;i<20;i++)

    {

        printf("%.1f ",angle[i]);///小黑印出來

        fprintf(fout,"%.1f ",angle[i]);///檔案印出來

    }///這裡老師沒有fclose

    printf("\n");///小黑印出跳行

    fprintf(fout,"\n");///檔案跳行

}

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();///重劃畫面

}


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'){///play

        if(t%30==0)myRead();

        myInterpolate((t%30)/30.0);

        glutPostRedisplay();

        t++;

    }

    if(key=='s') myWrite();///調好動作才save存檔

    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_angles_TRT_again");

    glutMouseFunc(mouse);

    glutMotionFunc(motion);

    glutKeyboardFunc(keyboard);

    glutDisplayFunc(display);


    glutMainLoop();

 }

=========================================================================

///week16_interpolation
///改編自week15_angles_TRT_again
#include <GL/glut.h>
#include <stdio.h>
float angle[20],oldX=0;
int angleID=0;
FILE * fout=NULL, * fin = NULL;
void myWrite()
{///每呼叫一次myWrite
    if(fout == NULL)fout=fopen("file.txt","w+");

    for(int i = 0;i<20;i++)
    {
        printf("%.1f ",angle[i]);///小黑印出來
        fprintf(fout,"%.1f ",angle[i]);///檔案印出來
    }///這裡老師沒有fclose
    printf("\n");///小黑印出跳行
    fprintf(fout,"\n");///檔案跳行
}
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();///重劃畫面
}

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){
    if(t%50==0) myRead();
    myInterpolate((t%50)/50.0);
    glutPostRedisplay();
    glutTimerFunc(20,timer,t+1);
}
void keyboard(unsigned char key,int x,int y)
{
    if(key=='p'){///play
        myRead();
        glutTimerFunc(0,timer,0);
        ///if(t%30==0)myRead();
        ///myInterpolate((t%30)/30.0);
        ///glutPostRedisplay();
        ///t++;
    }
    if(key=='s') myWrite();///調好動作才save存檔
    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_angles_TRT_again");
    glutMouseFunc(mouse);
    glutMotionFunc(motion);
    glutKeyboardFunc(keyboard);
    glutDisplayFunc(display);

    glutMainLoop();
 }
=========================================================================

see : 看的視角
center : 手機的中心

=========================================================================

#include <GL/glut.h>
void reshape(int w,int h){
    float ar = (float) w/(float) h;
    glViewport(0,0,w,h);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluPerspective(60,ar,0.1,100);

    glMatrixMode(GL_MODELVIEW);
    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 camera");
    glutDisplayFunc(display);
    glutReshapeFunc(reshape);
    glutMainLoop();
}






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