電腦圖學week02

 

印出白色茶壺

#include <GL/glut.h>

static void display(void)

{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glutSolidTeapot(0.3);

    glutSwapBuffers();

}

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

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("08160563 Good!");

    glutDisplayFunc(display);

    glutMainLoop();

}

將茶壺變成紅色

在static void display(void)多打一行glColor3f(1,0,0);

在static void display(void)多打

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();

 

將glBegin(GL_TRIANGLES);改成glBegin(GL_LINE_LOOP);

    

在茶壺的後面畫出一個圓

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();