week13

 week13

```C

#include <GL/glut.h>

void display()

{

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glRectf(0.5,0.5,-0.5,-0.5);//利用這行可以做出一個rectangle

    glutSwapBuffers();

}

int main(int argc,char ** argv)

{

    glutInit(&argc,argv);

    glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);

    glutInitWindowSize(600,600);

    glutCreateWindow("week13 rect TRT");

    glutDisplayFunc(display);

    glutMainLoop();

}

```

#include <GL/glut.h>

void display()

{

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glColor3f(1,1,1);//白色方塊

    glRectf(0.5,0.5,-0.5,-0.5);白色方塊(x1,x2,y1,y2)

    glPushMatrix();

        glColor3f(1,0,0);//紅色方塊

        glRectf(0.5,0.5,1.0,0.3);//紅色方塊(x1,x2,y1,y2)

    glPopMatrix();

    glutSwapBuffers();

}

int main(int argc,char ** argv)

{

    glutInit(&argc,argv);

    glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);

    glutCreateWindow("week13 rect TRT");

    glutDisplayFunc(display);

    glutMainLoop();

}

#include <GL/glut.h>

float angle=45;

void display()

{

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glColor3f(1,1,1);

    glRectf(0.5,0.5,-0.5,-0.5);

    glPushMatrix();

        glRotatef(angle,0,0,1);

        glTranslatef(-0.5,-0.4,0);//把方塊移到中間

        glColor3f(1,0,0);

        glRectf(0.5,0.5,1.0,0.3);

    glPopMatrix();

    glutSwapBuffers();

}

#include <GL/glut.h>

float angle=0,oldX=0;

void mouse(int button, int state,int x,int y){

    oldX=x;

}

void motion(int x,int y){

    angle+=(x-oldX);

    oldX=x;

    glutPostRedisplay();

}

void display()

{

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glColor3f(1,1,1);

    glRectf(0.3,0.5,-0.3,-0.2);

    glPushMatrix();

        glTranslatef(0.3,0.5,0);

        glRotatef(angle,0,0,1);

        glTranslatef(-0.3,-0.4,0);

        glColor3f(1,0,0);

        glRectf(0.3,0.5,0.8,0.3);

        glPushMatrix();

            glTranslatef(0.8,0.4,0);

            glRotatef(angle,0,0,1);

            glTranslatef(-0.8,-0.4,0);

            glColor3f(0,1,0);

            glRectf(0.8,0.5,1.1,0.3);

        glPopMatrix();

    glPopMatrix();

    glutSwapBuffers();

}

int main(int argc,char ** argv)

{

    glutInit(&argc,argv);

    glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);

    glutCreateWindow("week13 rect TRT");

    glutMouseFunc(mouse);

    glutMotionFunc(motion);

    glutDisplayFunc(display);

    glutMainLoop();

}

#include <GL/glut.h>

float angle[20],oldX=0;

int angleID=0;

void keyboard(unsigned char key, int x, int y){

    if(key=='1')angleID=0;

    if(key=='2')angleID=1;

    if(key=='3')angleID=2;

    if(key=='4')angleID=3;

}

void mouse(int button, int state,int x,int y){

    oldX=x;

}

void motion(int x,int y){

    angle[angleID]+=(x-oldX);

    oldX=x;

    glutPostRedisplay();

}

void display()

{

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glColor3f(1,1,1);

    glRectf(0.3,0.5,-0.3,-0.2);

    glPushMatrix();

        glTranslatef(0.3,0.5,0);

        glRotatef(angle[0],0,0,1);

        glTranslatef(-0.3,-0.4,0);

        glColor3f(1,0,0);

        glRectf(0.3,0.5,0.8,0.3);

        glPushMatrix();

            glTranslatef(0.8,0.4,0);

            glRotatef(angle[1],0,0,1);

            glTranslatef(-0.8,-0.4,0);

            glColor3f(0,1,0);

            glRectf(0.8,0.5,1.1,0.3);

        glPopMatrix();

    glPopMatrix();

    glPushMatrix();

    glTranslatef(-0.3,0.5,0);

    glRotatef(angle[2],0,0,1);

    glTranslatef(0.3,-0.4,0);

    glColor3f(1,0,0);

    glRectf(-0.3,0.5,-0.8,0.3);

        glPushMatrix();

            glTranslatef(-0.8,0.4,0);

            glRotatef(angle[3],0,0,1);

            glTranslatef(0.8,-0.4,0);

            glColor3f(0,1,0);

            glRectf(-0.8,0.5,-1.1,0.3);

        glPopMatrix();

    glPopMatrix();

    glutSwapBuffers();

}

int main(int argc,char ** argv)

{

    glutInit(&argc,argv);

    glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);

    glutCreateWindow("week13 rect TRT");

    glutMouseFunc(mouse);

    glutMotionFunc(motion);

    glutDisplayFunc(display);

    glutKeyboardFunc(keyboard);

    glutMainLoop();

}