2022年6月7日 星期二

VERY BEAUTIFUL,VERY POWERFUL


一

1-1.alpha內插公式 : alpha : `0.0~1.0`

       `angle = alpha * 新 + ( 1 - alpha ) * 舊`
      ex.
      - alpha : 0 => 舊
      - alpha : 0.5 => 半新半舊
      - alpha : 1 => 新

1-2.開glut新專案，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

///
#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();
}
///
二
開啟windows/projection
查看如何運鏡
三
///
#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();
}
///


再改成以下
///
#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();
}
///
於
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