2022年6月7日 星期二

Kuo's Graphic_Note_Week16

 Step 1 : Use Excel to know the function

    1-1.Function: angle = alpha * new + ( 1 - alpha ) * old


Step 2 : Using CodeBlocks to make Camera Lookat

    2-1. Coding

Code:
#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];
        fscanf(fin,"%f",&NewAngle[i]);
    }
    glutPostRedisplay();
}

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();
}
float alpha=0;

void keyboard(unsigned char key,int x, int y){
    if(key=='p'){
        myInterpolate(alpha);
        alpha+=0.01;
        if(alpha>1)alpha--;
    }
    if(key=='r')myRead();
    if(key=='s')myWrite();
    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);///white
    glRectf(0.3, 0.5, -0.3, -0.2);///body
    glPushMatrix();
        glTranslatef(0.3,0.5,0);///hanging on (0.5,0.5)
        glRotatef(angle[0],0,0,1);///Rotate
        glTranslatef(-0.3,-0.4,0);///Translate Rotating point to O(0,0)
        glColor3f(1,0,0);///red arms
        glRectf(0.3,0.5,0.8,0.3);///arms
        glPushMatrix();
            glTranslatef(0.8,0.4,0);
            glRotatef(angle[1],0,0,1);
            glTranslatef(-0.8,-0.4,0);
            glColor3f(0,1,0);///green
            glRectf(0.8,0.5,1.1,0.3);
        glPopMatrix();
    glPopMatrix();
    glPushMatrix();
        glTranslatef(-0.3,0.5,0);///hanging on (0.5,0.5)
        glRotatef(angle[2],0,0,1);///Rotate
        glTranslatef(0.3,-0.4,0);///Translate Rotating point to O(0,0)
        glColor3f(1,0,0);///red arms
        glRectf(-0.3,0.5,-0.8,0.3);///arms
        glPushMatrix();
            glTranslatef(-0.8,0.4,0);
            glRotatef(angle[3],0,0,1);
            glTranslatef(0.8,-0.4,0);
            glColor3f(0,1,0);///green
            glRectf(-0.8,0.5,-1.1,0.3);
        glPopMatrix();
    glPopMatrix();

    glutSwapBuffers();
}
int main(int ac,char**av,char**ev){
    glutInit(&ac,av);
    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);
    glutInitWindowSize(600,600);
    glutCreateWindow("Week14 TRT");
    glutKeyboardFunc(keyboard);
    glutMouseFunc(mouse);
    glutMotionFunc(motion);
    glutDisplayFunc(display);
    glutMainLoop();
}

    2-2. Coding (Modify the code)

 

    2-3. Build & Run

Code:

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

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();
}
///float alpha=0;
void timer(int t){
    float alpha=(t%30)/30.0;
    if(t%30==0)myRead();///新舊交接
    myInterpolate(alpha);
    glutTimerFunc(33,timer,t+1);
}

void keyboard(unsigned char key,int x, int y){
    if(key=='p'){
        myRead();
        glutTimerFunc(0,timer,0);
        //myInterpolate(alpha);
        //alpha+=0.01;
        //if(alpha>1)alpha--;
    }
    if(key=='r')myRead();
    if(key=='s')myWrite();
    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);///white
    glRectf(0.3, 0.5, -0.3, -0.2);///body
    glPushMatrix();
        glTranslatef(0.3,0.5,0);///hanging on (0.5,0.5)
        glRotatef(angle[0],0,0,1);///Rotate
        glTranslatef(-0.3,-0.4,0);///Translate Rotating point to O(0,0)
        glColor3f(1,0,0);///red arms
        glRectf(0.3,0.5,0.8,0.3);///arms
        glPushMatrix();
            glTranslatef(0.8,0.4,0);
            glRotatef(angle[1],0,0,1);
            glTranslatef(-0.8,-0.4,0);
            glColor3f(0,1,0);///green
            glRectf(0.8,0.5,1.1,0.3);
        glPopMatrix();
    glPopMatrix();
    glPushMatrix();
        glTranslatef(-0.3,0.5,0);///hanging on (0.5,0.5)
        glRotatef(angle[2],0,0,1);///Rotate
        glTranslatef(0.3,-0.4,0);///Translate Rotating point to O(0,0)
        glColor3f(1,0,0);///red arms
        glRectf(-0.3,0.5,-0.8,0.3);///arms
        glPushMatrix();
            glTranslatef(-0.8,0.4,0);
            glRotatef(angle[3],0,0,1);
            glTranslatef(0.8,-0.4,0);
            glColor3f(0,1,0);///green
            glRectf(-0.8,0.5,-1.1,0.3);
        glPopMatrix();
    glPopMatrix();

    glutSwapBuffers();
}
int main(int ac,char**av,char**ev){
    glutInit(&ac,av);
    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);
    glutInitWindowSize(300,300);
    glutCreateWindow("Week14 TRT");
    glutKeyboardFunc(keyboard);
    glutMouseFunc(mouse);
    glutMotionFunc(motion);
    glutDisplayFunc(display);
    glutMainLoop();
}


Step 3 :Camera Lookat

    3-1. Coding


    3-2. Build & Run

Final Code:
#include <GL/glut.h>
void display(){
    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
    glutSolidTeapot(2);///大茶壼
    glutSwapBuffers();
}
void motion(int x, int y){
    glMatrixMode(GL_MODELVIEW);///3D經過轉換到你最後的攝影機
    glLoadIdentity();
    gluLookAt( (x-150)/15.0, (y-150)/15.0, 3, ///eye
                0, 0, 0, ///center
                0, 1, 0);///up
    glutPostRedisplay();
}
void reshape(int w, int h){ 
    const float ar = (float) w / (float) h;
    glViewport(0, 0, w, h);
    glMatrixMode(GL_PROJECTION);///投影,把3D投射到2D畫面
    glLoadIdentity();
    gluPerspective(60, ar, 0.1, 100);
    glMatrixMode(GL_MODELVIEW);///3D經過轉換到你最後的攝影機
    glLoadIdentity() ;
    gluLookAt( 0, 0, 3, 0, 0, 0, 0, 1, 0);
}
int main(int argc, char**argv){
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);
    glutCreateWindow("week16 camera lookat");
    glutReshapeFunc(reshape);
    glutDisplayFunc(display);
    glutMotionFunc(motion);
    glutMainLoop();
}

Replenish

*aspect ratio=長寬比(寬/長(高), width/heigh)






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