OpenGL 光線與旋轉和滑鼠事件 Ch003

 (如有翻譯或解釋不太洽當,請多多指教)

glViewport

投影預覽

glMatrixMode

矩陣模式

gluPerspective

透視

gluLookAt

視點

glLightfv

光線

glLightModelfv

光線模式

glutSolidSphere

實心球面

 glRotatef

 旋轉

Code:

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

GLuint list; 
float spinx = 0; 
float spiny = 0; 
float spinz = 0;
GLfloat tdist = 0.0; 
GLfloat polyfactor = 1.0; 
GLfloat polyunits = 1.0; 
float delang = 5.0; 
int xAbs, yAbs;

void display (void) 
{ 
    GLfloat gray[] = { 0.8, 0.8, 0.8, 1.0 }; 
    GLfloat black[] = { 0.0, 0.0, 0.0, 1.0 }; 
 
    glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); 
    glPushMatrix (); 
    glTranslatef (0.0, 0.0, tdist); 
    glRotatef ((GLfloat) spinx, 1.0, 0.0, 0.0); 
    glRotatef ((GLfloat) spiny, 0.0, 1.0, 0.0); 
    glRotatef((GLfloat) spinz, 0.0, 0.0, 1.0);
  
    glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, gray); 
    glMaterialfv(GL_FRONT, GL_SPECULAR, black); 
    glMaterialf(GL_FRONT, GL_SHININESS, 0.0); 
    glEnable(GL_LIGHTING); 
    glEnable(GL_LIGHT0); 
    glEnable(GL_POLYGON_OFFSET_FILL); 
    glPolygonOffset(polyfactor, polyunits); 
    glCallList (list); 
    glDisable(GL_POLYGON_OFFSET_FILL); 
 
    glDisable(GL_LIGHTING); 
    glDisable(GL_LIGHT0); 
    glColor3f (1.0, 1.0, 0.0); 
    glPolygonMode(GL_FRONT_AND_BACK, GL_LINE); 
    glCallList (list); 
    glPolygonMode(GL_FRONT_AND_BACK, GL_FILL); 
 
    glPopMatrix (); 
    glFlush (); 
} 
 
void gfxinit (void) 
{ 
    GLfloat light_ambient[] = { 0.0, 0.0, 0.0, 1.0 }; 
    GLfloat light_diffuse[] = { 1.0, 1.0, 1.0, 1.0 }; 
    GLfloat light_specular[] = { 1.0, 1.0, 1.0, 1.0 }; 
    GLfloat light_position[] = { 1.0, 1.0, 1.0, 0.0 }; 
 
    GLfloat global_ambient[] = { 0.2, 0.2, 0.2, 1.0 }; 
 
    glClearColor (0.0, 0.0, 0.0, 1.0); 
 
    list = glGenLists(1); 
    glNewList (list, GL_COMPILE); 
       glutSolidSphere(1.0, 20, 12); 
    glEndList (); 
 
    glEnable(GL_DEPTH_TEST); 
 
    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); 
    glLightModelfv (GL_LIGHT_MODEL_AMBIENT, global_ambient); 
} 
 
// 重塑
void reshape(int width, int height) 
{ 
    glViewport (0, 0, width, height); 
    glMatrixMode (GL_PROJECTION); 
    glLoadIdentity (); 
    gluPerspective(45.0, (GLdouble)width/(GLdouble)height, 
        1.0, 10.0); 
    glMatrixMode (GL_MODELVIEW); 
    glLoadIdentity (); 
    gluLookAt (0.0, 0.0, 5.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0); 
} 
 
void CheckRot()
{
    if (spinx > 360.0f)
        spinx = 0.0f;
    if (spinx < 0.0f)
        spinx = 360.0-delang;
  
    if (spiny > 360.0f)
        spiny = 0.0f;
    if (spiny < 0.0f)
        spiny = 360.0f-delang;
  
    if (spinz > 360.0f)
        spinz = 0.0f;
    if (spinz < 0.0f)
        spinz = 360.0f-delang;
} 
// 滑鼠移動 
void MouseMove( int x, int y) { 
    spinx  += (y-yAbs);
    yAbs = y;
    spiny -= (x-xAbs);
    xAbs = x;
    CheckRot();
    glutPostRedisplay();
} 
// 滑鼠按下
void MousePress(int button, int state, int x, int y)
{
    if ((button == GLUT_LEFT_BUTTON) && (state == GLUT_DOWN))
    {
        xAbs = x;
        yAbs = y;
    }
} 
int main(int argc, char** argv) 
{ 
    glutInit(&argc, argv); 
    glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH); //設定初始顯示模組
    glutCreateWindow(argv[0]); 
    glutReshapeFunc(reshape);     // 重塑
    glutMotionFunc (MouseMove);  // 滑鼠移動事件
    glutDisplayFunc(display);    // 顯示
    gfxinit();                   
    glutMainLoop(); 
    return 0; 
}  

 

 =====================================================

 

 光源 glLightfv

   glLightfv( 光源, 光源屬性, RGBA );

   // 設定發光體的光源的特性
   glEnable(GL_DEPTH_TEST);                               //啟動深度測試 
   glLightfv( GL_LIGHT0, GL_AMBIENT, light_ambient);      //設定 環境光 GL_AMBIENT
   glLightfv( GL_LIGHT0, GL_DIFFUSE, light_diffuse);        //設定 散射光 GL_DIFFUSE
   glLightfv( GL_LIGHT0, GL_SPECULAR,light_specular);  //設定 反射光 GL_SPECULAR
  
   glLightfv( GL_LIGHT0, GL_POSITION,light_position);     //光的座標
   glLightModelfv (GL_LIGHT_MODEL_AMBIENT, global_ambient);  // 光線模型


 

 glRotatef 旋轉

glRotatef( GLfloat angle, GLfloat x, GLfloat y, GLfloat z )

glRotatef(角度,X軸,Y軸,Z軸)

 

  glutMotionFunc (MouseMove);  // 滑鼠移動事件 

將涵式加入 glutMotionFunc