圖學筆記week06

 開啟glut專案

不用像往常一樣刪掉，按ctrl+F，搜尋light

就會跳出以下結果

把程式碼成下列:

///#include <GL/glut.h>

const GLfloat light_ambient[]  = { 0.0f, 0.0f, 0.0f, 1.0f };///這之前的程式都刪掉

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 };

void display()

{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

        glColor3f(1,1,0);

        glutSolidTeapot(0.3);

    glutSwapBuffers();

}

int main(int argc, char *argv[])

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("week06 light");

    glutDisplayFunc(display);

    ///引用來的程式，要放glutCreateWindow之後，才會有效

    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);

///放glutMainloop()之前

    glutMainLoop();///卡在這裡，之前的程式都不會執行到

}

///

變成下列結果

把上週keyboard_mouse_motion拿出來

///

#include <GL/glut.h>

#include <stdio.h>

float x=150, y=150, z=0, scale=1.0;

int oldX=0, oldY=0;

void display()

{

    glClearColor(0.5, 0.5, 0.5, 1);///R, G, B, A其中A半透明功能,目前沒開

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glPushMatrix();///備份矩陣

        glTranslatef( (x-150)/150.0 , -(y-150)/150.0, z);

        glScalef(scale, scale, scale);

        glColor3f(1,1,0);

        glutSolidTeapot(0.3);

    glPopMatrix();///還原矩陣

    glutSwapBuffers();

}

void keyboard(unsigned char key, int mouseX, int mouseY)

{

}

void mouse(int button, int state, int mouseX, int mouseY)

{///為了修飾瞬間移動的錯誤，改加了這條程式碼

    oldX =mouseX; oldY =mouseY;

}

void motion(int mouseX, int mouseY)

{

    if(mouseX - oldX > 0) scale *=1.01;

    if(mouseX - oldX < 0) scale *=0.99;

    ///x += (mouseX-oldX); y += (mouseY - oldY);

    oldX = mouseX;  oldY = mouseY;

    display();

}

int main(int argc, char**argv)

{

    glutInit( &argc, argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("Week05 keyboard");

    glutDisplayFunc(display);

    glutKeyboardFunc(keyboard);

    glutMouseFunc(mouse);

    glutMotionFunc(motion);

    glutMainLoop();

}

///

改成下列程式，加入打光

///

#include <GL/glut.h>

#include <stdio.h>

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 };

float x=150, y=150, z=0, scale=1.0;

int oldX=0, oldY=0;

void display()

{

    glClearColor(0.5, 0.5, 0.5, 1);///R, G, B, A其中A半透明功能,目前沒開

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glPushMatrix();///備份矩陣

        glTranslatef( (x-150)/150.0 , -(y-150)/150.0, z);

        glScalef(scale, scale, scale);

        glColor3f(1,1,0);

        glutSolidTeapot(0.3);

    glPopMatrix();///還原矩陣

    glutSwapBuffers();

}

void keyboard(unsigned char key, int mouseX, int mouseY)

{

}

void mouse(int button, int state, int mouseX, int mouseY)

{///為了修飾瞬間移動的錯誤，改加了這條程式碼

    oldX =mouseX; oldY =mouseY;

}

void motion(int mouseX, int mouseY)

{

    if(mouseX - oldX > 0) scale *=1.01;

    if(mouseX - oldX < 0) scale *=0.99;

    ///x += (mouseX-oldX); y += (mouseY - oldY);

    oldX = mouseX;  oldY = mouseY;

    display();

}

int main(int argc, char**argv)

{

    glutInit( &argc, argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("Week05 keyboard");

    glutDisplayFunc(display);

    glutKeyboardFunc(keyboard);

    glutMouseFunc(mouse);

    glutMotionFunc(motion);

    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();

}

///

打出下列程式碼，使其可以用鍵盤按鍵執行移動、縮放和轉動的指令:

///

#include <GL/glut.h>

#include <stdio.h>

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 };

float x=150, y=150, z=0, scale=1.0, angle=0.0;

int oldX=0, oldY=0, now=1;///now: 1移動, 2轉動, 3縮放

void display()

{

    glClearColor(0.5, 0.5, 0.5, 1);///R, G, B, A其中A半透明功能,目前沒開

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glPushMatrix();///備份矩陣

        glTranslatef( (x-150)/150.0 , -(y-150)/150.0, z);

        glRotatef(angle, 0,1,0);///對Y軸轉動

        glScalef(scale, scale, scale);///縮放成scale倍

        glColor3f(1,1,0);

        glutSolidTeapot(0.3);

    glPopMatrix();///還原矩陣

    glutSwapBuffers();

}

void keyboard(unsigned char key, int mouseX, int mouseY)

{

    if(key=='1' || key=='w' || key=='W') now=1;///移動

    if(key=='2' || key=='e' || key=='E') now=2;///轉動

    if(key=='3' || key=='r' || key=='R') now=3;///縮放

}

void mouse(int button, int state, int mouseX, int mouseY)

{///為了修飾瞬間移動的錯誤，改加了這條程式碼

    oldX =mouseX; oldY =mouseY;

}

void motion(int mouseX, int mouseY)

{

     if(now==1){///移動

        x += (mouseX - oldX);

        y += (mouseY - oldY);///移動

    }else if(now==2){///轉動

        angle += (mouseX - oldX);///轉動

    }else if(now==3){

        if( mouseX - oldX > 0) scale *= 1.01;///縮放

        if( mouseX - oldX < 0) scale *= 0.99;

    }

    oldX = mouseX;  oldY = mouseY;

    display();

}

int main(int argc, char**argv)

{

    glutInit( &argc, argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("Week05 keyboard");

    glutDisplayFunc(display);

    glutKeyboardFunc(keyboard);

    glutMouseFunc(mouse);

    glutMotionFunc(motion);

    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();

}

///