week02 3/3 電腦圖學

 今日主題:點 線 面

使用Glut寫出可愛的茶壺*>)))

變成紅色了~~~

#include <GL/glut.h>

static void display(void)

{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glColor3f(1,0,0);

    glutSolidTeapot(0.3);

    glutSwapBuffers();

}

int main(int argc, char *argv[])

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("GLUT Shapes");

    glutDisplayFunc(display);

    glutMainLoop();

}

進階的來囉

增加點花樣

#include <GL/glut.h>

static void display(void)

{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glBegin(GL_TRIANGLES);

        glColor3f(1.0f,0.0f,0.0f);  glVertex2f(0.0f,  1.0f);

        glColor3f(0.0f,1.0f,0.0f);  glVertex2f(0.87f, -0.5f);

        glColor3f(0.0f,0.0f,1.0f); glVertex2f(-0.87f, -0.5f);

    glEnd();

    glColor3f(0.5,1,0.2);

    glutSolidTeapot(0.3);

    glutSwapBuffers();

}

int main(int argc, char *argv[])

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("GLUT Shapes");

    glutDisplayFunc(display);

    glutMainLoop();

}

glBegin(GL_LINE_LOOP);

改函式即改樣式

#include <GL/glut.h>

#include <math.h>

static void display(void)

{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glBegin(GL_POLYGON);

        glColor3f(1.0f,0.0f,1.0f);

        for(float angle=0; angle<3.14159265358979*2; angle+=0.01)

        {

            glVertex2f( 0.5*cos(angle), 0.5*sin(angle) );

        }

    glEnd();

    glColor3f(0.5,1,0.2);

    glutSolidTeapot(0.3);

    glutSwapBuffers();

}

int main(int argc, char *argv[])

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("GLUT Shapes");

    glutDisplayFunc(display);

    glutMainLoop();

}