week 04 OW李寧OW

今天一開始小葉老師教我們畫圓

利用COS和 SIN來做圖
可以畫出很漂亮的圓

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

void display()
{
        glBegin(GL_POLYGON);
        for (float angle=0;angle<=3.14*2;angle+=0.01)
        {
            glVertex2f(cos(angle),sin(angle));
        }
        glEnd();
        glutSwapBuffers();
}

int main(int argc, char*argv[])
{
    glutInit(&argc,argv);
    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE |GLUT_DEPTH);
    glutCreateWindow("04160346");
    glutDisplayFunc(display);
    glutMainLoop();
}


在加上幾行程式碼就可以換顏色了
不同的座標點有不同的顏色

#include <GL/glut.h>

#include <math.h>
#include <stdio.h>
void display()
{

        glBegin(GL_POLYGON);

        for (float angle=0;angle<=3.14*2;angle+=0.01)
        {
            glVertex2f(cos(angle),sin(angle));
        }
        glEnd();
        glutSwapBuffers();
}
void mouse(int button,int state,int x,int y)
{
    printf("%d %d %d %d\n",button,state,x,y);
    glColor3f(1,x/300.0,y/300.0);
}
int main(int argc, char*argv[])
{
    glutInit(&argc,argv);
    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE |GLUT_DEPTH);
    glutCreateWindow("04160346");
    glutDisplayFunc(display);
    glutMouseFunc(mouse);
    glutMainLoop();
}




在一次修改
可以用拖曳的方式來改顏色了

#include <GL/glut.h>

#include <math.h>
#include <stdio.h>
void display()
{

        glBegin(GL_POLYGON);

        for (float angle=0;angle<=3.14*2;angle+=0.01)
        {
            glVertex2f(cos(angle),sin(angle));
        }
        glEnd();
        glutSwapBuffers();
}
void mouse(int button,int state,int x,int y)
{
    printf("%d %d %d %d\n",button,state,x,y);
}
void motion(int x,int y)
{
    glColor3f(1,x/300.0,y/300.0);
    glutPostRedisplay();
}
int main(int argc, char*argv[])
{
    glutInit(&argc,argv);
    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE |GLUT_DEPTH);
    glutCreateWindow("04160346");
    glutDisplayFunc(display);
    glutMouseFunc(mouse);
    glutMotionFunc(motion);
    glutMainLoop();
}




最後做出一個小精靈
嘴巴可以開合喔

#include <GL/glut.h>

#include <math.h>
#include <stdio.h>
float mouth=0;
void display()
{
        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
        glBegin(GL_TRIANGLE_FAN);
        glVertex2f(0,0);
        for (float angle=0 + mouth;angle<=3.14*2-mouth;angle+=3.14/100)
        {
            glVertex2f(cos(angle),sin(angle));
        }
        glEnd();
        glutSwapBuffers();
}
void mouse(int button,int state,int x,int y)
{
    printf("%d %d %d %d\n",button,state,x,y);
}
void motion(int x,int y)
{
    mouth = x/300.0;
    glColor3f(1,x/300.0,y/300.0);
    glutPostRedisplay();
}
int main(int argc, char*argv[])
{
    glutInit(&argc,argv);
    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE |GLUT_DEPTH);
    glutCreateWindow("04160346");
    glutDisplayFunc(display);
    glutMouseFunc(mouse);
    glutMotionFunc(motion);
    glutMainLoop();
}