WEEK5-阿睿課堂筆記

1.

物體的旋轉、移動、縮放

2.

打開CodeBlocks op

程式碼:

#include <GL/glut.h>
static void display()
{
    glPushMatrix(); ///備份起來
    glTranslatef(1,0,0);
    glutSolidTeapot(0.3);
    glPopMatrix(); ///還原會去

    glutSwapBuffers();
}
int main(int argc, char **argv)
{
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("04162710 translate rotate scale");
    glutDisplayFunc(display);
    glutMainLoop();

}

3.

使茶壺跟著滑鼠移動、縮放、旋轉

(一)移動的程式碼:

#include <GL/glut.h>
float mouseX=0, mouseY=0;

static void display()
{
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); ///清掉舊畫面
    glPushMatrix();///備份起來
    glTranslatef(mouseX,mouseY,0);
    glutSolidTeapot(0.3);
    glPopMatrix();///還原會去

    glutSwapBuffers();
}

void motion(int x,int y)
{
    mouseX = (x-150)/150.0;
    mouseY = -(y-150)/150.0;
    glutPostRedisplay();
}

int main(int argc, char **argv)
{
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("04162710 translate rotate scale");
    glutDisplayFunc(display);

    glutMotionFunc(motion);
    glutMainLoop();

}

(二)縮放的程式碼:

#include <GL/glut.h>
float mouseX=0, mouseY=0;

static void display()
{
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); ///清掉舊畫面
    glPushMatrix();///備份起來
    ///glTranslatef(mouseX,mouseY,0);
    glScalef(mouseX,mouseY,0); ///改SIZE縮放
    glutSolidTeapot(0.3);
    glPopMatrix();///還原會去

    glutSwapBuffers(); ///交換繪圖的memory buffer , 才能畫出來
}

void motion(int x,int y)
{
    mouseX = (x-150)/150.0;
    mouseY = -(y-150)/150.0;
    glutPostRedisplay(); ///貼一張3M Post便利貼,告訴電腦的GLUT要重畫畫面Re display
}

int main(int argc, char **argv)
{
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("04162710 translate rotate scale");
    glutDisplayFunc(display);
    ///glMouseFunc(mouse);
    glutMotionFunc(motion);
    glutMainLoop();

}

(三)旋轉的程式碼:

#include <GL/glut.h>
float mouseX=0, mouseY=0, rotX=0;  ///宣告rotX=0

static void display()
{
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    glPushMatrix();///備份起來
    ///glTranslatef(mouseX,mouseY,0);
    ///glScalef(mouseX,mouseY,0);
    glRotatef(rotX, 0, 0, 1); ///旋轉
glutSolidTeapot(0.3);
    glPopMatrix();///還原會去

    glutSwapBuffers();
}

void motion(int x,int y)
{
    mouseX = (x-150)/150.0;
    mouseY = -(y-150)/150.0;
    rotX = x;
    glutPostRedisplay();
}

int main(int argc, char **argv)
{
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("04162710 translate rotate scale");
    glutDisplayFunc(display);
    ///glMouseFunc(mouse);
    glutMotionFunc(motion);
    glutMainLoop();

}

(四)改變轉動XYZ的值來試試改變的方式:

#include <GL/glut.h>
float mouseX=0, mouseY=0, rotX=0; 

static void display()
{
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    glPushMatrix();///備份起來
    ///glTranslatef(mouseX,mouseY,0);
    ///glScalef(mouseX,mouseY,0);
    glRotatef(rotX, 0, 0, 1); ///旋轉 (改變XYZ)
glutSolidTeapot(0.3);
    glPopMatrix();///還原會去

    glutSwapBuffers();
}

void motion(int x,int y)
{
    mouseX = (x-150)/150.0;
    mouseY = -(y-150)/150.0;
    rotX = x;  
    glutPostRedisplay();
}

int main(int argc, char **argv)
{
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("04162710 translate rotate scale");
    glutDisplayFunc(display);
    ///glMouseFunc(mouse);
    glutMotionFunc(motion);
    glutMainLoop();

}