Week 06 彣禎的上課筆記

1.練習期中考題

glPushMatrix(); //備份矩陣  10%

    glRotatef(angle,x,y,z); //旋轉 30%

    glTranslatef(x,y,z); //移動 40%

    glScalef(x,y,z); //縮放 50%

    glBegin(GL_POLYGON); //開始畫 60%

        glNormal3f(nx,ny,nz); //打光的法向量 90%

        glTexcoord2f(tx,ty); //貼圖座標 100%

        glColor3f(r,g,b); //顏色 70%

        glVertex3f(x,y,z); //頂點 80%

    glEnd(); //結束畫

glPopMatrix(); //還原矩陣 20%

 

2.理解Case1.Case2

Case 1: 自轉

    {glRotatef(angle,x,y,z);

    {glTranslatef(x,y,z);

    {glScalef(x,y,z);

    {glBegin(GL_POLYGON);

        glNormal3f(nx,ny,nz);

        glTexcoord2f(tx,ty);       

        glColor3f(r,g,b);

        glVertex3f(x,y,z); }車子

    glEnd();

glPopMatrix(); }移動}旋轉}縮放

 

Case 2:轉整個大圓盤

 

3. T-R-T

 錯誤示範:

 

正確示範:

 

 

#include <GL/glut.h>
float mouseX=0;
static void display(void)
{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    glPushMatrix();

            glRotatef(mouseX,0,0,1);
            glColor3f(1,0,0);
            glutSolidTeapot(0.3);
            glPushMatrix();
            ///3.掛上去
                glTranslatef(0.5,0.14,0); ///3.把整個樓下的東西，移到紅色茶壺嘴
                glRotatef(mouseX,0,0,1); ///2.會轉動
                glTranslatef(0.41,-0.05,0);///1.把手移到轉盤中心
                glColor3f(1,1,1);
                glutSolidTeapot(0.3);
            glPushMatrix();
    glPopMatrix();
    glutSwapBuffers();
}
void motion(int x,int y)
{
    mouseX=x;
    glutPostRedisplay();
}
int main(int argc, char *argv[])
{
    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("TRT robot");

    glutDisplayFunc(display);

    glutMotionFunc(motion);

    glutMainLoop();

    return EXIT_SUCCESS;
}