2022年6月7日 星期二

(圖學筆記)電腦圖學Week16

 

step01-1

#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 write()

{

    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");

}

void read()

{

    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]);

    }

    glutPostRedisplay();

}

void interpolate(float alpha)

{

    for(int i=0;i<20;i++)

    {

        angle[i]=alpha*newangle[i]+(1-alpha)*oldangle[i];

    }

}

int t=0;

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

{

    if(key=='p')  

    {

        if(t%30==0) read();

        interpolate( (t%30)/30.0 );///介於0.0到1.0

        glutPostRedisplay();

        t++;

    }

    if(key=='s') write();

    if(key=='r') read();

    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);

    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 trt 2");

    glutMouseFunc(mouse);

    glutKeyboardFunc(key);

    glutMotionFunc(motion);

    glutDisplayFunc(display);

    glutMainLoop();

}


step01-2 按一次P自動補間

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

    for(int i=0;i<20;i++)
    {
        printf("%.1f",angle[i]);
        fprintf(fout,"%.1f",angle[i]);
    }///印出20個數字
    printf("\n");
    fprintf(fout,"\n");
}

void read()
{
    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]);
    }
    glutPostRedisplay();
}

void interpolate(float alpha)
{
    for(int i=0;i<20;i++)
    {
        angle[i]=alpha*newangle[i]+(1-alpha)*oldangle[i];
    }
}

void timer(int t)
{
    if(t%50==0) read();
    interpolate( (t%50)/50.0 );///介於0.0到1.0
    glutPostRedisplay();
    glutTimerFunc(5,timer,t+1);

}

void key(unsigned char key,int x,int y)
{
    if(key=='p')
    {
        read();
        glutTimerFunc(0,timer,0);
    }

    if(key=='s') write();
    if(key=='r') read();
    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);
    ///write();      
    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 trt 2");

    glutMouseFunc(mouse);
    glutKeyboardFunc(key);
    glutMotionFunc(motion);
    glutDisplayFunc(display);
    glutMainLoop();
}

2-1 運鏡

window => Projection.exe

<= eye => 鏡頭位置
<= center => 鏡頭看的位置
<= up => 畫面旋轉角度

2-2 resize

#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=>2D
    glLoadIdentity();
    gluPerspective(60,ar,0.1,100);

    glMatrixMode(GL_MODELVIEW);///3D Model+View
    glLoadIdentity();
    gluLookAt(1,0,3,///eye
                       0,1,0,///center看哪裡
                       0,0,1);///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();
}
step2-3 用滑鼠改變鏡頭位置

#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=>2D
    glLoadIdentity();
    gluPerspective(60,ar,1,10);

    glMatrixMode(GL_MODELVIEW);///3D Model+View
    glLoadIdentity();
    gluLookAt(1,0,3,0,1,0,0,0,2);
}
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 ,
              0,1,0,
              0,0,2);
    glutPostRedisplay();
}

int main(int argc,char**argv)
{
    glutInit(&argc,argv);
    glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);
    glutCreateWindow("Week16 camera");
    glutMotionFunc(motion);
    glutDisplayFunc(display);
    glutReshapeFunc(reshape);
    glutMainLoop();
}
於
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