week02 GLUT_first

先開GLUT project，從老師上課軟體裡解壓縮檔案freelut

解壓縮後放置桌面，並將檔案複製改名，接著開啟GLUT project 

#include <GL/glut.h>

void display()

{

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(); 

}

    

接著更改顏色，大小

複製前兩行

開始畫三角形

三角形三個頂點

      

更改三頂點的顏色

#include <GL/glut.h>

void display()

{

    glBegin(GL_POLYGON);

    glColor3f(1,0,0);    glVertex2f(0,1);

    glColor3f(0,1,0);   glVertex2f(-1,-1);

    glColor3f(0,0,1);  glVertex2f(+1,-1);

    glEnd();

glColor3f(1,1,0);

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();

}

皮卡丘??

找一張圖，用小畫家修改成200*200

用滴管吸，編輯顏色(/255)

畫圓

#include <GL/glut.h>

#include <math.h>

void myCircle(float r,float x,float y)

{

    glBegin(GL_POLYGON);

    for(float a=0;a<2*3.1415926535;a+=0.01)

    {

        glVertex2f(r*cos(a)+x,r*sin(a)+y);

    }

    glEnd();

}

void display()

{

    glColor3f(1,0,1);myCircle(0.6,0,0);

    glColor3f(1,0,0);myCircle(0.3,0.5,0.5);

    glColor3f(0,1,0);myCircle(0.3,-0.5,0.5);

    glColor3f(1,1,0);myCircle(0.3,-0.5,-0.5);

    glColor3f(0,0,1);myCircle(0.3,0.5,-0.5);

    glutSwapBuffers();

}

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

{

glutInit(&argc, argv);

glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

glutCreateWindow("GLUT Shapes");

    glutDisplayFunc(display);

    glutMainLoop();

}