2021年6月16日 星期三

電腦圖學week17_複習

 老樣子，先畫一個茶壺

#include <GL/glut.h>

void display(){

    glClearColor( 1,0,0,0);///設定用來Clear的Color用紅色

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);///清背景

        glColor3f( 1,1,0 );

        glutSolidTeapot( 0.3 );

    glutSwapBuffers();

}

int main( int argc, char ** argv )

{

    glutInit( &argc, argv);

    glutInitWindowSize(500,500);///調整視窗大小

    glutInitWindowPosition(700,0);///位置

    glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);

    glutCreateWindow("week17 review");


    glutDisplayFunc(display);

    glutMainLoop();

}

使用打光陣列，同時要有打光的函式, 在 main()呼叫

#include <GL/glut.h>
void display(){
    glClearColor( 1,0,0,0);///設定用來Clear的Color用紅色
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);///清背景
        glColor3f( 1,1,0 );
        glutSolidTeapot( 0.3 );
    glutSwapBuffers();
}
///打光
const GLfloat light_ambient[]  = { 0.0f, 0.0f, 0.0f, 1.0f };
const GLfloat light_diffuse[]  = { 1.0f, 1.0f, 1.0f, 1.0f };
const GLfloat light_specular[] = { 1.0f, 1.0f, 1.0f, 1.0f };
const GLfloat light_position[] = { 2.0f, 5.0f, 5.0f, 0.0f };
const GLfloat mat_ambient[]    = { 0.7f, 0.7f, 0.7f, 1.0f };
const GLfloat mat_diffuse[]    = { 0.8f, 0.8f, 0.8f, 1.0f };
const GLfloat mat_specular[]   = { 1.0f, 1.0f, 1.0f, 1.0f };
const GLfloat high_shininess[] = { 100.0f };
int main( int argc, char ** argv )
{
    glutInit( &argc, argv);
    glutInitWindowSize(500,500);///調整視窗大小
    glutInitWindowPosition(700,0);///位置
    glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);
    glutCreateWindow("week17 review");
    glutDisplayFunc(display);
    glEnable(GL_DEPTH_TEST);
    glDepthFunc(GL_LESS);
    glEnable(GL_LIGHT0);
    glEnable(GL_NORMALIZE);
    glEnable(GL_COLOR_MATERIAL);
    glEnable(GL_LIGHTING);
    glLightfv(GL_LIGHT0, GL_AMBIENT,  light_ambient);
    glLightfv(GL_LIGHT0, GL_DIFFUSE,  light_diffuse);
    glLightfv(GL_LIGHT0, GL_SPECULAR, light_specular);
    glLightfv(GL_LIGHT0, GL_POSITION, light_position);
    glMaterialfv(GL_FRONT, GL_AMBIENT,   mat_ambient);
    glMaterialfv(GL_FRONT, GL_DIFFUSE,   mat_diffuse);
    glMaterialfv(GL_FRONT, GL_SPECULAR,  mat_specular);
    glMaterialfv(GL_FRONT, GL_SHININESS, high_shininess);
    glutMainLoop();
}



先把身體註解掉,T-R-T只留下最下面的T


把 R弄好, 再把 T 及身體都放出來


程式碼:

#include <GL/glut.h>
float angle=45;
void display(){
    glClearColor( 1,0,0,0);///用來Clear的Color 用紅色
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    glPushMatrix();
        glColor3f( 1,1,0 );
        glutSolidTeapot( 0.3 );///身體先註解掉身體,只看手臂
        glPushMatrix();
            glTranslatef(-.3, 0, 0);///(3)再把轉動中的手臂,掛到肩上
            glRotatef(angle, 0,0,1);///(2)再轉動它
            glTranslatef(-.3, .1, 0);///(1)移動旋轉中心,放正中心
            glutSolidTeapot(0.3);///左手臂
        glPopMatrix();
    glPopMatrix();
    glutSwapBuffers();
}
///打光
const GLfloat light_ambient[]  = { 0.0f, 0.0f, 0.0f, 1.0f };
const GLfloat light_diffuse[]  = { 1.0f, 1.0f, 1.0f, 1.0f };
const GLfloat light_specular[] = { 1.0f, 1.0f, 1.0f, 1.0f };
const GLfloat light_position[] = { 2.0f, 5.0f, 5.0f, 0.0f };
const GLfloat mat_ambient[]    = { 0.7f, 0.7f, 0.7f, 1.0f };
const GLfloat mat_diffuse[]    = { 0.8f, 0.8f, 0.8f, 1.0f };
const GLfloat mat_specular[]   = { 1.0f, 1.0f, 1.0f, 1.0f };
const GLfloat high_shininess[] = { 100.0f };
int main( int argc, char ** argv )
{
    glutInit( &argc, argv);
    glutInitWindowSize(500,500);///調整視窗大小
    glutInitWindowPosition(700,0);///位置
    glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);
    glutCreateWindow("week17 review");
    glutDisplayFunc(display);
    glEnable(GL_DEPTH_TEST);
    glDepthFunc(GL_LESS);
    glEnable(GL_LIGHT0);
    glEnable(GL_NORMALIZE);
    glEnable(GL_COLOR_MATERIAL);
    glEnable(GL_LIGHTING);
    glLightfv(GL_LIGHT0, GL_AMBIENT,  light_ambient);
    glLightfv(GL_LIGHT0, GL_DIFFUSE,  light_diffuse);
    glLightfv(GL_LIGHT0, GL_SPECULAR, light_specular);
    glLightfv(GL_LIGHT0, GL_POSITION, light_position);
    glMaterialfv(GL_FRONT, GL_AMBIENT,   mat_ambient);
    glMaterialfv(GL_FRONT, GL_DIFFUSE,   mat_diffuse);
    glMaterialfv(GL_FRONT, GL_SPECULAR,  mat_specular);
    glMaterialfv(GL_FRONT, GL_SHININESS, high_shininess);
    glutMainLoop();
}

接下來用 mouse motion 讓它轉起來

#include <GL/glut.h>
float angle=45,oldX,oldY;
void mouse(int button, int state, int x, int y){
    oldX = x;
}
void motion( int x, int y ){
    angle += x-oldX;
    oldX = x;///小心,不要漏掉了
    glutPostRedisplay();///重畫畫面
}
void display(){
    glClearColor( 1,0,0,0);///用來Clear的Color 用紅色
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    glPushMatrix();
        glColor3f( 1,1,0 );
        glutSolidTeapot( 0.3 );///身體先註解掉身體,只看手臂
        glPushMatrix();
            glTranslatef(-.3, 0, 0);///(3)再把轉動中的手臂,掛到肩上
            glRotatef(angle, 0,0,1);///(2)再轉動它
            glTranslatef(-.3, .1, 0);///(1)移動旋轉中心,放正中心
            glutSolidTeapot(0.3);///左手臂
        glPopMatrix();
    glPopMatrix();
    glutSwapBuffers();
}
///打光

const GLfloat light_ambient[]  = { 0.0f, 0.0f, 0.0f, 1.0f };
const GLfloat light_diffuse[]  = { 1.0f, 1.0f, 1.0f, 1.0f };
const GLfloat light_specular[] = { 1.0f, 1.0f, 1.0f, 1.0f };
const GLfloat light_position[] = { 2.0f, 5.0f, 5.0f, 0.0f };
const GLfloat mat_ambient[]    = { 0.7f, 0.7f, 0.7f, 1.0f };
const GLfloat mat_diffuse[]    = { 0.8f, 0.8f, 0.8f, 1.0f };
const GLfloat mat_specular[]   = { 1.0f, 1.0f, 1.0f, 1.0f };
const GLfloat high_shininess[] = { 100.0f };
int main( int argc, char ** argv )
{
    glutInit( &argc, argv);
    glutInitWindowSize(500,500);///調整視窗大小
    glutInitWindowPosition(700,0);///位置
    glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);
    glutCreateWindow("week17 review");
    glutMouseFunc(mouse);
    glutMotionFunc(motion);
    glutDisplayFunc(display);
    glEnable(GL_DEPTH_TEST);
    glDepthFunc(GL_LESS);
    glEnable(GL_LIGHT0);
    glEnable(GL_NORMALIZE);
    glEnable(GL_COLOR_MATERIAL);
    glEnable(GL_LIGHTING);
    glLightfv(GL_LIGHT0, GL_AMBIENT,  light_ambient);
    glLightfv(GL_LIGHT0, GL_DIFFUSE,  light_diffuse);
    glLightfv(GL_LIGHT0, GL_SPECULAR, light_specular);
    glLightfv(GL_LIGHT0, GL_POSITION, light_position);
    glMaterialfv(GL_FRONT, GL_AMBIENT,   mat_ambient);
    glMaterialfv(GL_FRONT, GL_DIFFUSE,   mat_diffuse);
    glMaterialfv(GL_FRONT, GL_SPECULAR,  mat_specular);
    glMaterialfv(GL_FRONT, GL_SHININESS, high_shininess);
    glutMainLoop();
}

畫左手臂
右手臂也做出來
接下來要存檔、讀檔
if(key=='s'){///存檔
        if( fout==NULL ) fout = fopen("angle.txt", "w+");///write加檔案
        for(int i=0; i<20; i++) fprintf(fout, "%.2f ", angle[i]);
        fprintf(fout, "\n");
        printf("save angle.txt\n");
    }else if(key=='r'){///讀檔 (不能和存檔同時做,因angle.txt不能開2次)
        if( fin==NULL ) fin = fopen("angle.txt", "r");///read
        for(int i=0; i<20; i++) fscanf(fin, "%f", &angle[i]);
        glutPostRedisplay();///重畫畫面
        printf("read angle.txt\n");
    }

加入timer就會動囉！想要動得更順, 要利用 alpha 來內插



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