week02 點線面色彩

 

GLUT

step01-1 從codeblocks打開專案並打開GLU

複製以下程式碼後刪除原本的程式碼並輸入

#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();

}

step01-2增加glColor3f(1,1,0);變黃色茶壺

再改成glColor3f(0,1,0);變綠色茶壺

同時輸入

glColor3f(1,1,0);///黃色

glutSolidTeapot( 0.5 );///大茶壺

glColor3f(0,1,0);///綠色

glutSolidTeapot( 0.3 );///小茶壺

變成黃色大茶壺加上綠色小茶壺

最後把glutCreateWindow("GLUT Shapes");改成glutCreateWindow("week02");

step02-1

開新的專案

輸入

#include <GL/glut.h>

void display()

{

    glColor3f(0,1,0);///綠色

    glBegin(GL_POLYGON);

    glVertex2f(0,1);///上面

    glVertex2f(-1,-1);///左下角

    glVertex2f(1,-1);///右下角

    glEnd();

    glColor3f(1,1,0);///黃色

    glutSolidTeapot( 0.3 );///茶壺

    glutSwapBuffers();

}

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

{

glutInit(&argc, argv);

glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

glutCreateWindow("week02");

glutDisplayFunc(display);

glutMainLoop();

}

step02-2加入程式碼

glColor3f(1,0,0);

glColor3f(0,1,0);

glColor3f(0,0,1);

step02-3用作標劃AI的字

開新的檔案

複製之前的程式碼

改成

#include <GL/glut.h>

void display()

{

    glBegin(GL_POLYGON);

    glVertex2f( (65-100)/100.0, -(54-100)/100.0);

    glVertex2f( (34-100)/100.0, -(138-100)/100.0);

    glVertex2f( (59-100)/100.0, -(138-100)/100.0);

    glVertex2f( (87-100)/100.0, -(53-100)/100.0);

    glEnd();

    glutSwapBuffers();

}

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

{

glutInit(&argc, argv);

glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

glutCreateWindow("week02");

glutDisplayFunc(display);

glutMainLoop();

}

用小畫家計算座標或顏色

座標要除以長寬(200)的一半(如:100.0)

顏色要除以255.0

畫出圓形

程式碼

#include <GL/glut.h>

#include <math.h>

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

{

    glBegin(GL_POLYGON);

    for(float a=0; a<=2*3.141592; a+=0.01){///圓=2*3.14159

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

    }

    glEnd();

}

void display(){

glColor3f(234/255.0,141/255.0,128/255.0);

myCircle(0.5, 0, 0);///r,x,y

glColor3f(1,1,0);

myCircle(0.3, 0.5, 0.5);

glColor3f(1,0,0);

myCircle(0.3, -0.5, 0.5);

glColor3f(0,1,0);

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("week02");

glutDisplayFunc(display);

glutMainLoop();

}

homework

劃出田字

程式碼

#include <GL/glut.h>

void display()

{

    glColor3f(234/255.0,141/255.0,128/255.0);

    glBegin(GL_POLYGON);

    glVertex2f( (30-100)/100.0, -(68-100)/100.0);

    glVertex2f( (45-100)/100.0, -(153-100)/100.0);

    glVertex2f( (56-100)/100.0, -(164-100)/100.0);

    glVertex2f( (49-100)/100.0, -(75-100)/100.0);

    glEnd();

    glColor3f(254/255.0,238/255.0,116/255.0);

    glBegin(GL_POLYGON);

    glVertex2f( (37-100)/100.0, -(72-100)/100.0);

    glVertex2f( (49-100)/100.0, -(80-100)/100.0);

    glVertex2f( (144-100)/100.0, -(72-100)/100.0);

    glVertex2f( (148-100)/100.0, -(56-100)/100.0);

    glEnd();

    glColor3f(172/255.0,202/255.0,192/255.0);

    glBegin(GL_POLYGON);

    glVertex2f( (147-100)/100.0, -(56-100)/100.0);

    glVertex2f( (130-100)/100.0, -(148-100)/100.0);

    glVertex2f( (139-100)/100.0, -(167-100)/100.0);

    glVertex2f( (164-100)/100.0, -(66-100)/100.0);

    glEnd();

    glColor3f(254/255.0,52/255.0,16/255.0);

    glBegin(GL_POLYGON);

    glVertex2f( (53-100)/100.0, -(148-100)/100.0);

    glVertex2f( (53-100)/100.0, -(155-100)/100.0);

    glVertex2f( (124-100)/100.0, -(149-100)/100.0);

    glVertex2f( (126-100)/100.0, -(142-100)/100.0);

    glEnd();

    glColor3f(172/255.0,202/255.0,192/255.0);

    glBegin(GL_POLYGON);

    glVertex2f( (124-100)/100.0, -(140-100)/100.0);

    glVertex2f( (141-100)/100.0, -(162-100)/100.0);

    glVertex2f( (136-100)/100.0, -(170-100)/100.0);

    glVertex2f( (124-100)/100.0, -(148-100)/100.0);

    glEnd();

    glColor3f(219/255.0,163/255.0,116/255.0);

    glBegin(GL_POLYGON);

    glVertex2f( (85-100)/100.0, -(74-100)/100.0);

    glVertex2f( (100-100)/100.0, -(69-100)/100.0);

    glVertex2f( (89-100)/100.0, -(146-100)/100.0);

    glVertex2f( (98-100)/100.0, -(145-100)/100.0);

    glEnd();

    glColor3f(88/255.0,130255.0,30/255.0);

    glBegin(GL_POLYGON);

    glVertex2f( (63-100)/100.0, -(109-100)/100.0);

    glVertex2f( (72-100)/100.0, -(116-100)/100.0);

    glVertex2f( (126-100)/100.0, -(107-100)/100.0);

    glVertex2f( (121-100)/100.0, -(101-100)/100.0);

    glEnd();

    glutSwapBuffers();

}

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

{

glutInit(&argc, argv);

glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

glutCreateWindow("week02");

glutDisplayFunc(display);

glutMainLoop();

}